CN107330268B - Northern hemisphere blocked high-voltage activity identification method - Google Patents
Northern hemisphere blocked high-voltage activity identification method Download PDFInfo
- Publication number
- CN107330268B CN107330268B CN201710511877.0A CN201710511877A CN107330268B CN 107330268 B CN107330268 B CN 107330268B CN 201710511877 A CN201710511877 A CN 201710511877A CN 107330268 B CN107330268 B CN 107330268B
- Authority
- CN
- China
- Prior art keywords
- voltage
- pressure
- blocking
- blocked
- center
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16Z—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS, NOT OTHERWISE PROVIDED FOR
- G16Z99/00—Subject matter not provided for in other main groups of this subclass
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Landscapes
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
A method for identifying northern hemisphere blocking high-voltage activity belongs to the technical field of meteorology and meteorology software application, and comprises the steps of determining the geographic position information of a northern hemisphere blocking high-voltage center; the computer realizes two steps of closed obstruction high-pressure classification. The invention filters the closed blocking high-pressure centers in the blocking high-pressure definition domain, judges the distance between a plurality of high-pressure centers, removes the false blocking high-pressure centers through multiple times of circulating filtration judgment, and further improves the accuracy of judging the blocking high-pressure centers. The computer recognition speed is high, the working efficiency is improved, and a large amount of manpower and time are saved. The invention provides a new method for objectively identifying the blocking high voltage activity in consideration of the diversity of the blocking high voltage, is convenient and quick, can improve the accuracy and the working efficiency of the blocking high voltage identification, greatly shortens the time of the blocking high voltage identification, and improves the accuracy of the automatic identification of the blocking high voltage by a machine.
Description
Technical Field
The invention belongs to the technical field of meteorology and meteorological software application, and particularly relates to a method for identifying northern hemisphere blocked high-voltage activity.
Background
The blocking high pressure is one of large-scale systems which can be stably maintained for a long time in an atmospheric system and can cause abnormal weather and climate to continuously appear in the nearby area, so that the statistics and analysis of the activities of the large-scale systems are particularly important.
The high blocking pressure can affect the weather and climate in a large area, and the long-term duration of the high blocking pressure can bring drought and continuous overcast and rainy to the large area, thereby causing climate abnormity. The establishment, maintenance and destruction of the blocking situation have very important effects on the weather and climate in China, Chinese scholars pay attention to the research on the blocking high pressure in Asia very early, the establishment, maintenance and breakdown of the blocking high pressure in winter can affect the weather and climate in a large area, and the drought high temperature, the continuous overcast and rainy days and the low temperature are brought to the large area. The influence of summer blocking high pressure on the weather of China is concentrated in the areas of the Huo-Ke sea, the Wularshan mountain and the Begar lake.
In the 40-80 th generation of the 20 th century, scholars at home and abroad intensively study the definition of the formation of the blocking activity, the activity frequency and the medium-short term dynamic process thereof, Elliot and Smith firstly count the blocking activity of the western wind zone of the northern hemisphere, and the statistical study of the system finds that the number of blocking events of the middle pacific is twice that of the northeast Atlantic, Rex counts the period of 1932 + 1950, the total 82 times of blocking of the Atlantic (60 DEG w-20 DEG E) are more than 30 times of blocking of the Atlantic, and the maximum frequency is in spring. Clearly, Elliot and Smith are distinct from the geographical distribution of Rex with respect to frequent congestion activity.
Sumner indicates that European obstruction is most frequent for 5 months and least for 7 months with a fully subjective method, and White and Clark analyzed the monthly mean plot of northern hemisphere sea level barometric pressure and 700hPa potential altitude plot between 1950 and 1970, and concluded that the frequency of North Pacific obstruction activity is greatest in the autumn and winter (10-3 months), least in the spring and summer, and significantly different from Rex obstruction activity, which is greatest in the spring.
The national scholars of Tang 25035cang firstly put forward the definition of the blockage situation between 500hPa altitude field of 100 and 180 DEG E in each month of 1956, Sukla and Mo calculate the northern hemisphere blockage high-pressure seasonal change and geographical distribution by using 500hPa altitude field in 1977 in 1963, and the Lada, the King of Rodhai gives the definition of dipole by using the 500hPa altitude 5-day average map.
Zhang Bei Zhong et al consults the historical weather map, counts the average times of blocking high pressure in the four seasons and months in the high latitude area in northern hemisphere of 1965-1991, and provides the annual space-time evolution image of the blocking high pressure activity. The Yang-Y defines an east Asian occlusion index by calculating the latitudinal offset. Li Feng et al discussed the geographical distribution characteristics of summer continental Eurasia blocking high-voltage activities and discussed the geographical distribution characteristics of summer continental Eurasia blocking high-voltage activities by using near 32a data and adopting a computer retrieval method. According to the weather definition of blocking high pressure, the Shixiangjun searches blocking high pressure in a high latitude area in the European continent of 55a by using the re-analysis data of a weather field and a weather field of NCEP/NCAR500hPa day by day in 1950-2004, statistics shows that the frequency distribution of a blocking high pressure center has obvious seasonal geographical difference, and the Singting and the like search blocking high pressure activities in the European area of 6 months in 1995 by adopting an objective method. The Liu-just and the like are automatically judged, so that the maximum blocking activity frequency of the Beihu lake in Asia summer is 30%, and the reduction of the Husky-huoshi is 27.5%, which is similar to the result of the plum front.
The geographic distribution and frequency of the above mentioned activities related to northern hemisphere obstruction are different at home and abroad, and the main reason for the difference may be that the definition of the obstruction process and the standard of the continuous weather are different.
Therefore, the relatively objective division of the Asian blocking flow patterns is still a research content.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for identifying the northern hemisphere blocked high-voltage activity automatically identifies the blocked high-voltage activity data through a computer, ensures the objectivity and scientificity of identification, and solves the technical problem that the geographic distribution and the frequency of the northern hemisphere blocked form activity are different at home and abroad due to the fact that the definition of the blockage process and the standard of the continuous weather are different at present.
A method for identifying northern hemisphere blocked high-voltage activity includes the following steps, and the following steps are performed in sequence,
step one, determining geographical position information of northern hemisphere blocked high-voltage center
A1, preliminary determination of the area of north hemisphere for high pressure occlusion
Selecting a reanalysis data set of an American meteorological environment forecasting center for N years, reanalyzing altitude field lattice point data, recording the reanalysis data set into a computer, wherein N is a natural number more than 1, setting the time resolution to be four times in 1 day or once in 1 day, setting the space resolution to be 2.5 degrees of longitude multiplied by 2.5 degrees of latitude, setting the lattice point distance between two adjacent lattice points to be 250km,
the method comprises the steps of preliminarily determining a defined area of northern hemisphere blocking high pressure to be 40-160 DEG E, lattice points to be 17-65, 40-75 DEG N and lattice points to be 53-67, and 49 multiplied by 15 lattice points in total by taking a closed high pressure center on a 500hPa potential altitude field, the daily movement of the high pressure center not more than 12.5 longitudes and the maintenance of the high pressure center for more than 3 days as standards;
a2, identifying blocking high-pressure centers that define zone boundaries
Respectively expanding the northern hemisphere high-pressure blocking area defined in the step A1 to the east and the south by a lattice point distance, expanding the definition range of the high-pressure blocking area to 40-162.5 DEG E, 17-66, 37.5-75 DEG N and 52-67, wherein the total number of the lattice points is 50 x 16, and the area is a parameter adjusting area of the northern hemisphere high-pressure blocking area,
extracting potential height field data of 500hPa from a parameter adjusting region of northern hemisphere blocking high voltage by utilizing grads software, storing the potential height field data as a '500 hgt' file, and automatically setting a file name according to needs;
a3, using the program written by fortran, using the high-voltage center on the potential height field of 500hPa as the standard, the computer initially completes the identification of the existence of the closed blocking high-voltage center and the closed isobars in the parameter adjustment area of the blocking high-voltage,
only one closed blocking high-voltage center is arranged within 1 day, the geographic position and the air pressure value data information of the closed blocking high-voltage center are directly stored,
more than one closed blocking high-voltage center exists in 1 day, the sum of squares of lattice point distances of the two closed blocking high-voltage centers is defined as an idisb numerical value, the idisb is an integer, the closed blocking high-voltage centers are filtered according to the idisb value, false closed blocking high-voltage centers are filtered out, geographical position information data of the true closed blocking high-voltage centers are generated, a data file of ". dat" is generated and stored in a computer, and the determination of the geographical position information of the closed blocking high-voltage centers in the computer is completed;
step two, realizing closed obstruction high-pressure classification by a computer
B1, the computer changes the geographical position information data of the closed blocking high-voltage center obtained in the step one into a data format of which the column represents the date and the row represents the geographical position of the high-voltage center, places the position data of more than one high-voltage center in the same row within 1 day,
calculating and obtaining the square sum of the lattice point number distances of the high-voltage centers between two adjacent days,
the sum of the distances between two adjacent grid points of more than three consecutive days is less than 16, the high-voltage center position of the coincident date is unchanged, the high-voltage blockage in the consecutive days is the same continuous high-voltage blockage process,
the duration time of the high-voltage blockage is more than or equal to 3 days, the data information of the date and the center position of the high-voltage blockage process is stored for one complete high-voltage blockage process, and the computer automatically records the related information of the high-voltage blockage process;
b2, the computer automatically and correspondingly changes the time of the date output of the process of the high-voltage blocking activity into the day of the year, and outputs the statistical and classification results of the high-voltage blocking activity.
The specific method for identifying the closed and blocked high-voltage center and the closed isobars in the step A3 is as follows: and if the air pressure value of one point on the 500hPa potential height field is greater than or equal to the air pressure values of 8 peripheral grid points adjacent to the point, judging that a closed high-pressure center exists and a closed isobaric line exists, wherein the point is a high-pressure central point, and the closed line formed by connecting the 8 peripheral grid points adjacent to the point is the isobaric line.
The filtering method in the step A3 comprises the following steps: defining the square sum of the lattice point distances of the two closed blocking high-voltage centers as an idisb value and the idisb is an integer, and enabling the distance between the two closed blocking high-voltage centers to be larger than or equal to three lattice points in the program, wherein the idisb is larger than or equal to 329, the two closed high-pressure centers are two real closed blocking high-pressure centers which are independent mutually,
and (3) idisb is less than or equal to 8, the two closed blocking high-pressure centers are the same closed blocking high-pressure center, nine-point average air pressure values of the two closed blocking high-pressure centers are respectively calculated and obtained, and the geographical position information of the high-pressure center with the high nine-point average air pressure value is stored as a true blocking high-pressure center.
The information related to the blocking high-voltage process in step B1 includes: year, number of blocked high-pressure processes accumulated in one year, sequence number of the blocked high-pressure processes, number of blocked high-pressure process activities, middle month and date of the blocked high-pressure processes, starting month and date of the blocked high-pressure processes, ending month and date of the blocked high-pressure processes, middle date of the blocked high-pressure processes activities II, starting date of the blocked high-pressure processes II, ending date of the blocked high-pressure processes II, center position of the blocked high-pressure processes, center average air pressure and nine-point average air pressure.
The statistical and classification results of the blocking high-voltage activities output in the step B2 include: generating a year-by-year blocking high-voltage identification file named as 'XXXX blocking high-voltage identification. txt'; the blocking high-voltage classification file, year by year, is named "XXXX blocking high-voltage classification. txt".
The data information included in the blocking high-voltage classification file comprises the following data information: year, number of blocked high-pressure processes accumulated in one year, sequence number of the blocked high-pressure processes, number of blocked high-pressure process activities, middle month and date of the blocked high-pressure processes, starting month and date of the blocked high-pressure processes, ending month and date of the blocked high-pressure processes, middle date of the blocked high-pressure processes activities II, starting date of the blocked high-pressure processes II, ending date of the blocked high-pressure processes II, center position of the blocked high-pressure processes, center average air pressure and nine-point average air pressure.
The information related to the blocking high-voltage process in step B1 includes: year, number of blocked high-pressure processes accumulated in one year, sequence number of the blocked high-pressure processes, number of blocked high-pressure process activities, middle month and date of the blocked high-pressure processes, starting month and date of the blocked high-pressure processes, ending month and date of the blocked high-pressure processes, middle date of the blocked high-pressure processes activities II, starting date of the blocked high-pressure processes II, ending date of the blocked high-pressure processes II, center position of the blocked high-pressure processes, center average air pressure and nine-point average air pressure.
Through the design scheme, the invention can bring the following beneficial effects:
1. the invention filters the closed blocking high-pressure centers in the blocking high-pressure definition domain, judges the distance between a plurality of high-pressure centers, removes the false blocking high-pressure centers through multiple times of circulating filtration judgment, and further improves the accuracy of judging the blocking high-pressure centers.
2. The computer expands a grid distance around the definition domain of the blocking high voltage in the actual identification process, and is helpful for identifying the blocking high voltage process of the high voltage center at the boundary.
3. The computer carries out statistical analysis, except for the statistics of the activity days and the activity process, the computer also carries out statistical output on factors such as high-pressure central point information, start-stop time, central position, nine-point air pressure and the like, and the statistical output result is a txt document and is more beneficial to the subsequent statistical analysis work of blocking high pressure. The computer recognition speed is high, the working efficiency is improved, and a large amount of manpower and time are saved.
4. According to the invention, the blocking high voltage can be divided into four types, namely a partial east type blocking high voltage, a partial west type blocking high voltage, a middle type blocking high voltage and other four types blocking high voltage through the geographical position, and the concentrated area of the number of blocking high activities and days.
5. The invention provides a new method for objectively identifying the blocking high voltage activity in consideration of the diversity of the blocking high voltage, is convenient and quick, can improve the accuracy and the working efficiency of the blocking high voltage identification, greatly shortens the time of the blocking high voltage identification, and improves the accuracy of the automatic identification of the blocking high voltage by a machine.
Drawings
The invention is further described with reference to the following figures and detailed description:
fig. 1 is a flow chart of a method for identifying northern hemisphere blocked high-voltage activity according to the present invention.
Fig. 2 is a graph of cumulative days (a) of high latitude summer obstructive high pressure activity course in continental europe and asia from 1948 to 2009 versus longitude.
Fig. 3 is a graph of the cumulative number of high latitude summer obstructive high pressure activity courses (b) versus longitude in continental europe and asia from 1948 to 2009.
FIG. 4 shows how frequent obstructive high-pressure activity occurred in the European Asia continental province in 1948-2009 in summer with the same maintenance days.
Fig. 5 shows the statistics of the number of days of high-pressure activity blocked by the Ehehai in summer (6 months to 8 months) from 1951 to 2009.
Detailed Description
The invention adopts the following technical scheme to solve the technical problems:
the invention relates to a method for identifying northern hemisphere blocked high-voltage activity, which mainly comprises two parts, wherein one part is used for preprocessing data, finishing the determination of geographic position information of a northern hemisphere blocked high-voltage center, carrying out the judgment work of blocked high voltage, and selecting height field data meeting the judgment condition of blocked high voltage to form a data file of ". dat"; and the other part of the statistics, analysis and classification work of the fractional blocking high pressure realizes the classification of the closed blocking high pressure, outputs the detailed information of the blocking high pressure process and stores the result as a text of ". txt", thereby being beneficial to the subsequent processing.
The data preprocessing part of the method comprises the following specific steps:
a1, re-analyzing the re-analyzed data set of the selected American weather environment forecasting center for N years continuously to re-analyze the height field lattice point data, wherein the time resolution is four times a day or once a day, the space resolution is 2.5 degrees multiplied by 2.5 degrees (the lattice distance is about 250km), and the blocking high pressure definition summarized according to Rex [1] and Julian [2], is that:
1) a closed high-voltage center is arranged on the 500hPa potential height field;
2) high voltage center day movement is no more than 12.5 longitudes (high voltage center day movement is no more than 5 grid points, about 1250 km);
3) the high pressure center is maintained for at least 3 days or more.
The standard is used as the basis for judging the activity of the blocking high voltage, the study region of the blocking high voltage is determined to be 40-160 degrees E (grid points 17-65), 40-75 degrees N (grid points 53-67), and 49 multiplied by 15 grid points, and the blocking high voltage definition region is roughly selected.
A2, in order to solve the problem that the boundary grid points are blocking high-voltage centers, expanding the blocking high-voltage definition range in A1 to east and south by one circle respectively, and expanding the distance of one grid point to be about 250km, namely expanding the blocking high-voltage definition range to 40-162.5 degrees E (17-66), 37.5-75 degrees N (52-67) and 50 x 16 grid points in total, searching the blocking high-voltage centers in the range, and completing the parameter adjustment area of the blocking high-voltage. The method aims to consider the matching with cold vortex identification, and can more accurately identify the blocking high-voltage center near the boundary of the domain, thereby avoiding disputes and confusion. By means of grads software, potential height field data of 500hPa are extracted according to the adjusting range provided by A3 and stored as a file of '500 hgt', and the file name can be set according to the requirement.
And A3, identifying the high-voltage center in the area by using a fortran writing program according to the blocking high-voltage judging condition of A1 and the area with the adjusted parameters in A2, wherein the high-voltage center identification method is that the air pressure of a certain point is simultaneously less than or equal to the air pressure values of 8 grid points of the adjacent periphery, the high-voltage center is considered to exist and a closed isobaric line exists, and the computer can preliminarily complete the identification of whether the blocking high-voltage center exists and the closed isobaric line exists. Within the definition of blocking high pressure, the existence of a closed high pressure center and a closed isobar according to 500hPa is considered as a complete blocking high pressure process.
In the identification process of the high-voltage center, if only a single closed high-voltage center exists in the same day, the high-voltage center in the day is not required to be filtered, and related information such as the geographic position of the high-voltage center, air pressure value data information and the like is directly stored. If a plurality of closed high-pressure centers exist in the same day, filtering is needed, and the filtering method comprises the following steps: defining the square sum of the lattice point distances of the two closed high-voltage centers as an idisb value and the idisb is an integer, and separating the two high-voltage centers by more than or equal to three lattice points according to actual empirical values in the program, namely the idisb is equal to 329, then two high-voltage centers independent of each other, otherwise if idisb<9, i.e. idisb is less than or equal to 8, the two are regarded as the same high-pressure center. Rejection of false blocking high according to idisb valueAnd pressing the center, keeping 'true' to block the high-voltage center, and generating a 'dat' data file, so far, the computer completes a data preprocessing part.
Calling the preprocessing result of A3, carrying out classification statistical analysis on the continuous N-year blocked high-pressure processes, selecting the blocked high-pressure process which accords with the definition of blocked high pressure mainly from four main aspects of distance judgment, space judgment, time judgment and date judgment due to different distribution conditions of actual blocked high pressure, then outputting detailed information of the continuous N-year blocked high-pressure process, generating a txt document which comprises detailed information of the number, the sequence number, the number of days of activity, the starting and ending dates of the blocked high pressure, the central position of the blocked high pressure, the central air pressure, nine-point average air pressure and the like of the blocked high-pressure process, facilitating later calling and later-period statistical processing, and simultaneously generating annual 'blocked high-pressure identification' txt 'and annual' blocked high-pressure classification 'txt' for comparison and analysis.
The specific method for realizing the blockage high-pressure split statistics by the computer comprises the following steps:
b1, according to the three specific definitions of the blocking high voltage of A1, the pretreatment result of A3 finishes the selection work of high voltage centers with closure on 500hPa day by day, and the first condition of the definition of the blocking high voltage is met; for the second condition defined for blocking high pressure, the high pressure center day moves no more than 12.5 longitude, i.e., cannot exceed 5 grid point distances, if taking an integer, then the maximum move is 4 grid point distances. Firstly, storing preprocessed data into a data format with a list indicating date and a row indicating the position of a high-voltage center, placing position data of different high-voltage centers on the same row on the same day, secondly, calculating the sum of squares of the grid point distances of all the high-voltage centers between two adjacent days (the ith day and the (i + 1) th day, the (i + 1) th day and the (i + 2) th day, and the like), recording grid points meeting the requirement, if the sum of the grid point distances of two consecutive adjacent days is less than 16 (such as the ith day and the (i + 1) th day and the (i + 2) th day), recording as the same continuous high-voltage blocking process if the high-voltage center positions of the coincident dates (the (i + 1) between two consecutive adjacent days) coincide, finally, judging the duration time of the high-voltage blocking according to the third definition of the high-voltage blocking, and recording as a single high-voltage blocking process if the duration time is more than or equal to 3 days, recording a blocking high-pressure process, automatically recording related detailed information such as date, central position information and the like of the blocking high-pressure process by a program, if the duration is less than 3 days, not meeting a blocking high definition standard, not belonging to the blocking high-pressure process, directly filtering in the program and carrying out next cycle judgment, not outputting an array, and not recording any related information.
The distance and duration judgment process is repeated for multiple times, and each grid point in the data is guaranteed to be calculated. If the multi-day high-voltage center connecting lines intersect at the same high-voltage center point, the blocking high-voltage process with long duration is recorded as a primary blocking high-voltage process, and if the continuous time on the same side of the intersection point is more than or equal to 3 days, the other high-voltage center connecting lines are also recorded as a primary blocking high-voltage process.
The judgment of the invention is based on the blocking process once a day, if the situation that the two or more blocking processes are simultaneously existed in the actual situation meeting all the conditions described above in the same day is met, a program for independent judgment is added at the position of calculating the space distance of the two-day blocking high voltage, at this time, a prompt of 'multiple blocking high voltages appear at this position' appears on an output screen, at this time, manual independent judgment is needed, the judgment standard is the same as that described in the foregoing, after the number of the blocking processes is judged manually, the result is input into a computer, the program can record corresponding blocking high information, and the subsequent calculation and judgment work is continuously executed.
B2, after the condition needing to be judged separately is processed, the time output by the date of the process of the blocking high-pressure activity is correspondingly changed into the day one in the year, the statistical result of the blocking high-pressure activity is output, and the generated data comprises 17 columns in total, the information comprises detailed information such as the year, the number of the accumulated blocking high-pressure processes in the year, the serial number of the blocking high-pressure process, the number of the days of the blocking high-pressure process activity, the middle month and date of the blocking high-pressure process, the starting month and date of the blocking high-pressure process, the ending month and date of the blocking high-pressure process, the middle date II of the blocking high-pressure process activity, the starting date II of the blocking high-pressure process, the central position of the blocking high-pressure, the central average air pressure, the nine-point average air pressure and the like, and a separate file year by year is also generated, the "XXXX block high voltage identification txt" and "XXXX block high voltage classification txt" files record the blocking high voltage activity of the year.
According to the invention, the blocking high pressure can be divided into four categories, namely a far east category (137.5-152.5-E-Huoshka sea area), a far west category (45-62.5-E-Wularshan mountain area), a middle category (100-135-E-Begar lake area) and other category 4 blocking high pressure categories (as shown in figures 2 and 3) according to the geographical position and the concentrated area of the number of blocking high activities and days. In addition, the invention searches and analyzes the time-space change characteristics of the summer blocking activity in nearly 62a Asia, and the result shows that the statistical blocking high-pressure case is more in the process of 3-7 days of the life cycle (as shown in figure 4). The invention also takes the number of days of the processes of upper-middle-level resistance as an example, and briefly analyzes the characteristics of the annual and annual activities in 1951-2009, and the results are shown in fig. 5.
In the first embodiment, the blocking high voltage can be classified into four types, namely a partial east type blocking high voltage, a partial west type blocking high voltage, a middle type blocking high voltage and other types of blocking high voltage according to the geographical position of the blocking high voltage and the concentration area of the number and the number of days of the blocking high voltage.
The relevance of the year-by-year accumulated days of the upper-east blocking high voltage (Hippocampus blocking high voltage) and the high average field of 500hPa in summer is selected, the significance level of the central area is α exceeding 0.001, and the objectivity and scientificity of the calculation of the automatic identification blocking high voltage activity data of the machine are further proved.
1, selecting a re-analysis data set of the American meteorological environment forecasting center to analyze data of height field on the day by day or four times per day from 1948 to 2009, and extracting 500hPa height field data by grads.
2, the invention uses FORTRAN language, forming a computer language by meteorological techniques and methods such as high-voltage blockage discrimination basis, high-voltage center identification, false blockage high-voltage filtration, high-voltage blockage splitting, classification statistics and the like, inputting the extracted 500hPa height field data into the software of the invention, and analyzing and sorting the data by using the software.
And 3, extracting and judging the data according to the defined region of the blocked high voltage and the judgment condition, judging whether the high voltage center and the closed isobars exist in the selected data region, avoiding that the high value is on the boundary and filtering out a false high voltage center by expanding the judgment range and filtering the high voltage center, forming a dat file and finishing the data preprocessing work.
And 4, calling the previously generated dat file, splitting and classifying and counting the blocked high pressure to generate a text ". txt", wherein the generated data comprises 17 columns of detailed information including the year, the number of the blocked high pressure processes accumulated in one year, the sequence number of the blocked high pressure processes, the number of days of activity of the blocked high pressure processes, the middle month and date of the blocked high pressure processes, the starting month and date of the blocked high pressure processes, the ending month and date of the blocked high pressure processes, the middle date 2 of the blocked high pressure processes, the starting date 2 of the blocked high pressure processes, the ending date 2 of the blocked high pressure processes, the central position of the blocked high pressure centers, the central average air pressure, the nine-point average air pressure and the like.
The invention provides an objective and comprehensive identification method for the activity process of various high-pressure blocking areas in middle and high latitude areas based on the weather definition of high-pressure blocking and the conditions of the existence of the activity thereof, and aims at the specific characteristics of the research area, filters out the pseudo-blocking high-pressure center information by a certain technical means, and is applied to the actual business.
The method of the invention searches and screens 500hPa height field data day by day of a re-analysis data set of the American meteorological environment forecasting center according to the realization of blocking high voltage by using FORTRAN language, can directly find out the forming, moving and extinction tracks of the blocking high voltage by the position and movement of a high voltage blocking central point, determines the initial and final positions and the maintaining time of the high voltage blocking central point, counts the frequency of high voltage blocking activities and the accumulated days of high voltage blocking occurrence, automatically forms classified and statistical documents, and is convenient for extraction and analysis in the future.
The invention also carries out statistical analysis on the information of the high-pressure blockage activities in 1948-2009 which are automatically identified by the computer, can automatically realize the information of the change characteristics of high-pressure blockage, such as classification, seasonality, annual interval and the like, and compares and analyzes the historical actual conditions with the information, thereby having ideal effect. The recognition speed is high, the working efficiency is improved, and a large amount of manpower and time are saved.
According to the invention, the range of the identification area is expanded to a corresponding range according to different-order derivatives, the method is more favorable for identifying the blocking high-voltage process of the closed high-voltage center near the defined boundary, the position information of the real high-voltage center is determined by a filtering method, and the false blocking high-voltage is filtered out.
The invention considers the diversity of the blocking high voltage as much as possible, greatly shortens the time for identifying the blocking high voltage and improves the accuracy of the automatic identification of the blocking high voltage by the machine. The invention provides a new tool for objectively identifying blocking high-voltage activities, which is convenient and quick and can improve the accuracy and the working efficiency of blocking high-voltage identification.
Claims (6)
1. A method for identifying northern hemisphere blocked high-voltage activity is characterized by comprising the following steps: comprises the following steps which are sequentially carried out,
step one, determining geographical position information of northern hemisphere blocked high-voltage center
A1, preliminary determination of the area of north hemisphere for high pressure occlusion
Selecting a reanalysis data set of an American meteorological environment forecasting center for N years, reanalyzing altitude field lattice point data, recording the reanalysis data set into a computer, wherein N is a natural number more than 1, setting the time resolution to be four times in 1 day or once in 1 day, setting the space resolution to be 2.5 degrees of longitude multiplied by 2.5 degrees of latitude, setting the lattice point distance between two adjacent lattice points to be 250km,
the method comprises the steps of preliminarily determining a defined area of northern hemisphere blocking high pressure to be 40-160 DEG E, lattice points to be 17-65, 40-75 DEG N and lattice points to be 53-67, and 49 multiplied by 15 lattice points in total by taking a closed high pressure center on a 500hPa potential altitude field, the daily movement of the high pressure center not more than 12.5 longitudes and the maintenance of the high pressure center for more than 3 days as standards;
a2, identifying blocking high-pressure centers that define zone boundaries
Respectively expanding the northern hemisphere high-pressure blocking area defined in the step A1 to the east and the south by a lattice point distance, expanding the definition range of the high-pressure blocking area to 40-162.5 DEG E, 17-66, 37.5-75 DEG N and 52-67, wherein the total number of the lattice points is 50 x 16, and the area is a parameter adjusting area of the northern hemisphere high-pressure blocking area,
extracting potential height field data of 500hPa from a parameter adjusting region of northern hemisphere blocking high voltage by utilizing grads software, storing the potential height field data as a '500 hgt' file, and automatically setting a file name according to needs;
a3, using the program written by fortran, using the high-voltage center on the potential height field of 500hPa as the standard, the computer initially completes the identification of the existence of the closed blocking high-voltage center and the closed isobars in the parameter adjustment area of the blocking high-voltage,
only one closed blocking high-voltage center is arranged within 1 day, the geographic position and the air pressure value data information of the closed blocking high-voltage center are directly stored,
more than one closed blocking high-voltage center exists in 1 day, the sum of squares of lattice point distances of the two closed blocking high-voltage centers is defined as an idisb numerical value, the idisb is an integer, the closed blocking high-voltage centers are filtered according to the idisb value, false closed blocking high-voltage centers are filtered out, geographical position information data of the true closed blocking high-voltage centers are generated, a data file of ". dat" is generated and stored in a computer, and the determination of the geographical position information of the closed blocking high-voltage centers in the computer is completed;
step two, realizing closed obstruction high-pressure classification by a computer
B1, the computer changes the geographical position information data of the closed blocking high-voltage center obtained in the step one into a data format of which the column represents the date and the row represents the geographical position of the high-voltage center, places the position data of more than one high-voltage center in the same row within 1 day,
calculating and obtaining the square sum of the lattice point number distances of the high-voltage centers between two adjacent days,
the sum of the distances between two adjacent grid points of more than three consecutive days is less than 16, the high-voltage center position of the coincident date is unchanged, the high-voltage blockage in the consecutive days is the same continuous high-voltage blockage process,
the duration time of the high-voltage blockage is more than or equal to 3 days, the data information of the date and the center position of the high-voltage blockage process is stored for one complete high-voltage blockage process, and the computer automatically records the related information of the high-voltage blockage process;
b2, the computer automatically and correspondingly changes the time of the date output of the process of the high-voltage blocking activity into the day of the year, and outputs the statistical and classification results of the high-voltage blocking activity.
2. A method of identifying northern hemisphere blocked high voltage activity as claimed in claim 1, wherein: the specific method for identifying the closed and blocked high-voltage center and the closed isobars in the step A3 is as follows: and if the air pressure value of one point on the 500hPa potential height field is greater than or equal to the air pressure values of 8 peripheral grid points adjacent to the point, judging that a closed high-pressure center exists and a closed isobaric line exists, wherein the point is a high-pressure central point, and the closed line formed by connecting the 8 peripheral grid points adjacent to the point is the isobaric line.
3. A method of identifying northern hemisphere blocked high voltage activity as claimed in claim 1, wherein: the filtering method in the step A3 comprises the following steps: defining the square sum of the lattice point distances of the two closed blocking high-voltage centers as an idisb value and the idisb is an integer, and enabling the distance between the two closed blocking high-voltage centers to be larger than or equal to three lattice points in the program, wherein the idisb is larger than or equal to 329, the two closed high-pressure centers are two real closed blocking high-pressure centers which are independent mutually,
and (3) idisb is less than or equal to 8, the two closed blocking high-pressure centers are the same closed blocking high-pressure center, nine-point average air pressure values of the two closed blocking high-pressure centers are respectively calculated and obtained, and the geographical position information of the high-pressure center with the high nine-point average air pressure value is stored as a true blocking high-pressure center.
4. A method of identifying northern hemisphere blocked high voltage activity as claimed in claim 1, wherein: the information related to the blocking high-voltage process in step B1 includes: year, number of blocked high-pressure processes accumulated in one year, sequence number of the blocked high-pressure processes, number of blocked high-pressure process activities, middle month and date of the blocked high-pressure processes, starting month and date of the blocked high-pressure processes, ending month and date of the blocked high-pressure processes, middle date of the blocked high-pressure processes activities II, starting date of the blocked high-pressure processes II, ending date of the blocked high-pressure processes II, center position of the blocked high-pressure processes, center average air pressure and nine-point average air pressure.
5. A method of identifying northern hemisphere blocked high voltage activity as claimed in claim 1, wherein: the statistical and classification results of the blocking high-voltage activities output in the step B2 include: generating a year-by-year blocking high-voltage identification file named as 'XXXX blocking high-voltage identification. txt'; the blocking high-voltage classification file, year by year, is named "XXXX blocking high-voltage classification. txt".
6. A method of identifying northern hemisphere blocked high voltage activity as claimed in claim 5, wherein: the data information included in the blocking high-voltage classification file comprises the following data information: year, number of blocked high-pressure processes accumulated in one year, sequence number of the blocked high-pressure processes, number of blocked high-pressure process activities, middle month and date of the blocked high-pressure processes, starting month and date of the blocked high-pressure processes, ending month and date of the blocked high-pressure processes, middle date of the blocked high-pressure processes activities II, starting date of the blocked high-pressure processes II, ending date of the blocked high-pressure processes II, center position of the blocked high-pressure processes, center average air pressure and nine-point average air pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710511877.0A CN107330268B (en) | 2017-06-29 | 2017-06-29 | Northern hemisphere blocked high-voltage activity identification method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710511877.0A CN107330268B (en) | 2017-06-29 | 2017-06-29 | Northern hemisphere blocked high-voltage activity identification method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107330268A CN107330268A (en) | 2017-11-07 |
| CN107330268B true CN107330268B (en) | 2020-06-02 |
Family
ID=60198023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710511877.0A Active CN107330268B (en) | 2017-06-29 | 2017-06-29 | Northern hemisphere blocked high-voltage activity identification method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107330268B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112131958B (en) * | 2020-08-28 | 2022-05-20 | 成都信息工程大学 | Method for automatically identifying southwest low vortex |
| CN113724280B (en) * | 2021-09-15 | 2023-12-01 | 南京信息工程大学 | Automatic identification method for ground weather map high-voltage system |
| CN115082788B (en) * | 2022-06-21 | 2023-03-21 | 中科三清科技有限公司 | Air pressure center identification method and device, electronic equipment and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06126713A (en) * | 1992-10-19 | 1994-05-10 | Masatake Shono | Method of producing wood brick and wood brick block using wood brick produced by the method |
| CN106447069A (en) * | 2016-07-15 | 2017-02-22 | 国网湖南省电力公司 | Power grid ice coating medium-short-term prediction method based on blocking high index |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7590589B2 (en) * | 2004-09-10 | 2009-09-15 | Hoffberg Steven M | Game theoretic prioritization scheme for mobile ad hoc networks permitting hierarchal deference |
-
2017
- 2017-06-29 CN CN201710511877.0A patent/CN107330268B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06126713A (en) * | 1992-10-19 | 1994-05-10 | Masatake Shono | Method of producing wood brick and wood brick block using wood brick produced by the method |
| CN106447069A (en) * | 2016-07-15 | 2017-02-22 | 国网湖南省电力公司 | Power grid ice coating medium-short-term prediction method based on blocking high index |
Non-Patent Citations (2)
| Title |
|---|
| 《四种客观定量表征阻塞高压方法的对比分析》;金荣花 等；;《高原气象》;20091031;第28卷(第5期);第1121-1128页； * |
| 《欧亚阻塞高压的计算机识别》;张婷婷 等；;《科技信息》;20091231(第15期);第409-410页； * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107330268A (en) | 2017-11-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107610469B (en) | Day-dimension area traffic index prediction method considering multi-factor influence | |
| CN104484993B (en) | Processing method of cell phone signaling information for dividing traffic zones | |
| CN110245981B (en) | Crowd type identification method based on mobile phone signaling data | |
| Philippon et al. | The influence of ENSO on winter rainfall in South Africa | |
| Dunn et al. | HadISD: A quality-controlled global synoptic report database for selected variables at long-term stations from 1973–2011 | |
| CN107330268B (en) | Northern hemisphere blocked high-voltage activity identification method | |
| CN113780174B (en) | Storm-type landslide identification method for high vegetation platform combined with random forest algorithm | |
| CN106339775A (en) | Air heavy pollution case judging method based on weather classification and meteorological element clustering | |
| CN111045117A (en) | Climate monitoring and predicting platform | |
| CN108875806B (en) | False forest fire hot spot mining method based on space-time data | |
| CN102999694A (en) | Debris flow risk evaluation method in area with frequent mountain disasters | |
| CN108009596B (en) | Method and device for determining rainfall characteristics | |
| CN112949953B (en) | Rainstorm forecasting method based on PP theory and AF model | |
| CN110261272B (en) | Method for screening key influence factors on PM2.5 concentration distribution based on geographic detection and PCA (principal component analysis) | |
| CN106332052B (en) | Micro-area public security early warning method based on mobile communication terminal | |
| CN112347652B (en) | Heavy rain high risk division method based on linear moment frequency analysis of hydrological region | |
| CN111523562B (en) | Commuting mode vehicle identification method based on license plate identification data | |
| CN110245773A (en) | A kind of method that multi-source fact space-time predictor extracted and be included in interpretation of scheme application | |
| CN105467100A (en) | County territory soil erosion time-space dynamic monitoring method based on remote sensing and GIS | |
| CN111984701A (en) | Method, device, equipment and storage medium for predicting village settlement evolution | |
| Hayward et al. | A regional lightning climatology of the UK and Ireland and sensitivity to alternative detection networks | |
| CN114004514A (en) | Atmospheric ozone pollution occurrence meteorological condition grade discrimination method | |
| CN114093133A (en) | Regional geological disaster weather forecast early warning method | |
| Nijland et al. | Relating ring width of Mediterranean evergreen species to seasonal and annual variations of precipitation and temperature | |
| CN111339155A (en) | Correlation analysis system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |