CN104777526A - Method for correcting ASCAT inversion wind speed - Google Patents
Method for correcting ASCAT inversion wind speed Download PDFInfo
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Abstract
The invention discloses a method for correcting ASCAT inversion wind speed. The method is characterized by comprising the following steps: obtaining the buoy station inversion wind speed of each buoy station in a selected area at different observation times; obtaining a wind speed error time sequence of each buoy station in the selected area; determining a maximum influence distance according to the wind speed error time sequence of each buoy station in the selected area; correcting the ASCAT inversion wind speed to be corrected according to the selected buoy station so as to obtain the corrected ASCAT inversion wind speed. The method has the advantages of being simple in computing process, relatively good in correction effect and suitable for wide application to actual business.
Description
Technical field
The present invention relates to a kind of process meteorological data method, especially a kind of correction method of ASCAT Wind Speed Inversion.
Background technology
Sea surface wind wind speed fact observation difficulty, data information is rare, and forecast and service major part need to rely on satellite Retrieval wind field and numerical forecasting.US National Aeronautics and Space Administration's (National Aeronautics and Space Administration is called for short NASA) has greatly promoted by the application of method in synoptic analysis, forecast and numerical model of scatterometer Data Inversion wind field in the polar-orbiting satellite (QuikSCAT) of launching in July, 1999.Analyze and find, polar-orbiting satellite Wind Data surveys wind on wide face, ocean consistance with island is better, and especially on face, off-lying sea ocean, but the error of surveying between wind with island on coastal ocean face is relative large, reason is that land can produce interference to scattered signal, causes observational error.
The ASCAT WIND FIELDS data that European Space Agency (ESA) ASCAT (AdvancedSCATterometer) scatterometer carried by MetOP-A polar-orbiting satellite launched in 2006 provides have also been obtained good investigation and application abroad, becomes one of assimilation data of initial fields important in deepwater numerical forecasting.Based on NCEP Wind Products, dropsonde detection information and buoy dump observational data, by testing to CHINESE OFFSHORE ASCAT WIND FIELDS, result shows that ASCAT WIND FIELDS has good precision.Similar with QuikSCAT inverting wind, the observation wind speed of the buoy dump that the air speed value of ASCAT inverting wind with distance shore line (being greater than 60km) comparatively far away and does not affect by island has good consistance, both related coefficients can reach 0.94 above, and for the air speed value of the ASCAT inverting wind in distance shore line comparatively near (being less than 30km) and the observation wind speed correlativity of buoy dump poor, within the scope of water front 30 ~ 60km off sea or water front off sea is greater than 60km but the error of the observation wind speed of the ASCAT Wind Speed Inversion affected by island and buoy dump is larger, need to carry out correcting and just can to use afterwards, the method corrected this type of ASCAT Wind Speed Inversion is at present few, and validity is lower.
Summary of the invention
It is simple and correct the correction method of the good ASCAT Wind Speed Inversion of effect that technical matters to be solved by this invention is to provide a kind of computation process, is applicable to being widely applied in practical business.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of correction method of ASCAT Wind Speed Inversion, comprises the following steps:
1. the buoy dump Wind Speed Inversion that each buoy dump in acquisition selection area is secondary when difference is observed: for any one buoy dump in selection area, centered by this buoy dump and in the border circular areas being radius with preseting length L, obtain ASCAT Wind Speed Inversion secondary when observing with each on minimum 1 ~ 10 the ASCAT observation position of this buoy dump air line distance, then all ASCAT Wind Speed Inversion of during each observation acquired time are interpolated into the position at this buoy dump place by inverse distance weighting, obtain the buoy dump Wind Speed Inversion that this buoy dump is secondary when each observation,
2. the air speed error time series of each buoy dump in selection area is obtained: for any one buoy dump in selection area, using the 10 minute mean wind speeds of this buoy dump when each observation time as this buoy dump live wind speed secondary when correspondence is observed, then by this buoy dump each observe time time buoy dump Wind Speed Inversion and live wind speed subtract each other, obtain the air speed error of this buoy dump when correspondence is observed time, then the air speed error of this buoy dump when all observation time is formed an air speed error time series;
3. according to the air speed error time series of each buoy dump in selection area, calculate every two linear interval distances be less than setting air line distance D buoy dump air speed error time series between related coefficient, logarithm is adopted to carry out matching to the spacing distance between all related coefficients calculated and each self-corresponding adjacent floating labeling station of all related coefficients again, to obtain using the numerical value of spacing distance as X-axis and using the numerical value of related coefficient as the matched curve of Y-axis, then the numerical range of the numerical value 30km corresponding to the intersection point lower than matched curve and X-axis is defined as the selection range of maximum effect distance, any one value in the selection range of maximum effect distance is defined as maximum effect distance,
4. for an ASCAT Wind Speed Inversion to be corrected, by centered by the ASCAT observation position at this ASCAT Wind Speed Inversion place to be corrected, using all buoy dumps in maximum effect distance circular scope that is radius as selected buoy dump, then revised ASCAT Wind Speed Inversion is obtained according to selected buoy dump, detailed process is: ASCAT Wind Speed Inversion to be corrected substituted in the regression equation of each selected buoy dump and calculate, obtain the difference of result and the ASCAT Wind Speed Inversion to be corrected obtained by the regression equation calculation of each selected buoy dump, what difference corresponding for each selected buoy dump provided as the selected buoy dump by correspondence corrects value, the inverse distance weighting correcting value band maximum effect distance provided by all selected buoy dumps is weighted average computation, result weighted average calculation obtained corrects value as Wind Speed Inversion, finally calculate ASCAT Wind Speed Inversion to be corrected and Wind Speed Inversion correct value and value, should and be worth for revised ASCAT Wind Speed Inversion, wherein, for any one selected buoy dump, the process of establishing of its regression equation is: this has been selected buoy dump secondary buoy dump Wind Speed Inversion and live wind speed when all observation and formed a buoy dump wind speed time series, then set up the regression equation of this selected buoy dump according to buoy dump wind speed time series linear regression method,
Or detailed process is: obtain each selected buoy dump at air speed error secondary in time correcting the observation at ASCAT Wind Speed Inversion place, with the inverse distance weighting of band maximum effect distance, average computation is weighted to all air speed errors that during this observation time obtains again, result weighted average calculation obtained is as estimation error, finally calculate the difference of ASCAT Wind Speed Inversion to be corrected and estimation error, this difference is revised ASCAT Wind Speed Inversion.
Described step 1. in, by a buoy dump one observe time time buoy dump Wind Speed Inversion be designated as Zp,
wherein, n represents the sum for obtaining the ASCAT observation position of ASCAT Wind Speed Inversion required for this buoy dump, Z
irepresent the ASCAT Wind Speed Inversion that i-th ASCAT observation position is secondary when this observation, 1≤i≤n, d
irepresent as the distance between the buoy dump at center and i-th ASCAT observation position.
Described step 4. in, the Wind Speed Inversion corresponding with ASCAT Wind Speed Inversion to be corrected is corrected value and is designated as Zq,
wherein, m represents the sum of the selected buoy dump corresponding with ASCAT Wind Speed Inversion to be corrected, Z
jwhat an expression jth selected buoy dump provided corrects value, 1≤j≤m, d
jrepresent the ASCAT observation position as center and the individual distance selected between buoy dump of jth, R represents maximum effect distance.
Described step 4. in, estimation error corresponding for the ASCAT Wind Speed Inversion with to be corrected is designated as Zr,
t represents the sum of the selected buoy dump corresponding with ASCAT Wind Speed Inversion to be corrected, Z
srepresent that s selected buoy dump is at air speed error secondary in time correcting the observation at ASCAT Wind Speed Inversion place, 1≤s≤t, d
srepresent the ASCAT observation position as center and s the distance selected between buoy dump, R represents maximum effect distance.
Described step 1. in, described preseting length L=50km.Preseting length is too large, can cause that observation data precision is not high, calculated amount large, and preseting length is too small, data available can be caused less, affect result of calculation.
Described step 3. in, described setting air line distance D=400km.
Compared with prior art, the invention has the advantages that the buoy dump Wind Speed Inversion that each buoy dump first obtained in selection area is secondary when difference is observed, obtain the air speed error time series of each buoy dump in selection area, again according to air speed error time series determination maximum effect distance of each buoy dump in selection area, the selected buoy dump of last basis is treated and is corrected ASCAT Wind Speed Inversion and correct, to obtain revised ASCAT Wind Speed Inversion, not only computation process is simple, and carry out correction wind experiment and inspection based on 2010-2014 years ASCAT scatterometer WIND FIELDS data, result shows, adopt the method for the invention revised ASCAT Wind Speed Inversion error compared with the ASCAT Wind Speed Inversion error before correcting, average error, mean absolute error and root-mean-square error are all reduced, therefore effect is corrected better, be applicable to being widely applied in practical business.
Accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment one: a kind of correction method of ASCAT Wind Speed Inversion, comprises the following steps:
1. the buoy dump Wind Speed Inversion that each buoy dump in acquisition selection area is secondary when difference is observed: for any one buoy dump in selection area, centered by this buoy dump and in the border circular areas being radius with preseting length L (L=50km), obtain ASCAT Wind Speed Inversion secondary when observing with each on minimum 8 the ASCAT observation positions of this buoy dump air line distance, then all ASCAT Wind Speed Inversion of during each observation acquired time are interpolated into the position at this buoy dump place by inverse distance weighting, obtain the buoy dump Wind Speed Inversion that this buoy dump is secondary when each observation.
The buoy dump Wind Speed Inversion that a buoy dump is secondary when observing for one is designated as Zp,
wherein, n represents the sum for obtaining the ASCAT observation position of ASCAT Wind Speed Inversion required for this buoy dump, Z
irepresent the ASCAT Wind Speed Inversion that i-th ASCAT observation position is secondary when this observation, 1≤i≤n, d
irepresent as the distance between the buoy dump at center and i-th ASCAT observation position.
2. the air speed error time series of each buoy dump in selection area is obtained: for any one buoy dump in selection area, using the 10 minute mean wind speeds of this buoy dump when each observation time as this buoy dump live wind speed secondary when correspondence is observed, then by this buoy dump each observe time time buoy dump Wind Speed Inversion and live wind speed subtract each other, obtain the air speed error of this buoy dump when correspondence is observed time, then the air speed error of this buoy dump when all observation time is formed an air speed error time series.
3. according to the air speed error time series of each buoy dump in selection area, calculate every two linear interval distances be less than setting air line distance D (D=400km) buoy dump air speed error time series between related coefficient, logarithm is adopted to carry out matching to the spacing distance between all related coefficients calculated and each self-corresponding adjacent floating labeling station of all related coefficients again, to obtain using the numerical value of spacing distance as X-axis and using the numerical value of related coefficient as the matched curve of Y-axis, then the numerical value of the low 15km of numerical value corresponding to the intersection point than matched curve and X-axis is defined as maximum effect distance.
4. for an ASCAT Wind Speed Inversion to be corrected, by centered by the ASCAT observation position at this ASCAT Wind Speed Inversion place to be corrected, using all buoy dumps in maximum effect distance circular scope that is radius as selected buoy dump, then revised ASCAT Wind Speed Inversion is obtained according to selected buoy dump, detailed process is: ASCAT Wind Speed Inversion to be corrected substituted in the regression equation of each selected buoy dump and calculate, obtain the difference of result and the ASCAT Wind Speed Inversion to be corrected obtained by the regression equation calculation of each selected buoy dump, what difference corresponding for each selected buoy dump provided as the selected buoy dump by correspondence corrects value, the inverse distance weighting correcting value band maximum effect distance provided by all selected buoy dumps is weighted average computation, result weighted average calculation obtained corrects value as Wind Speed Inversion, this Wind Speed Inversion is corrected value and is designated as Zq,
wherein, m represents the sum of the selected buoy dump corresponding with ASCAT Wind Speed Inversion to be corrected, Z
jwhat an expression jth selected buoy dump provided corrects value, 1≤j≤m, d
jrepresent the ASCAT observation position as center and the individual distance selected between buoy dump of jth, R represents maximum effect distance, finally calculate ASCAT Wind Speed Inversion to be corrected and Wind Speed Inversion correct value and value, should and value be revised ASCAT Wind Speed Inversion, wherein, for any one selected buoy dump, the process of establishing of its regression equation is: this has been selected buoy dump secondary buoy dump Wind Speed Inversion and live wind speed when all observation and formed a buoy dump wind speed time series, then set up the regression equation of this selected buoy dump according to buoy dump wind speed time series linear regression method.
Embodiment two: remainder is identical with embodiment one, during its difference is that step 4., revised ASCAT Wind Speed Inversion is obtained according to selected buoy dump, detailed process is: obtain each selected buoy dump at air speed error secondary in time correcting the observation at ASCAT Wind Speed Inversion place, with the inverse distance weighting of band maximum effect distance, average computation is weighted to all air speed errors that during this observation time obtains again, result weighted average calculation obtained is as estimation error, this estimation error is designated as Zr
t represents the sum of the selected buoy dump corresponding with ASCAT Wind Speed Inversion to be corrected, Z
srepresent that s selected buoy dump is at air speed error secondary in time correcting the observation at ASCAT Wind Speed Inversion place, 1≤s≤t, d
srepresent the ASCAT observation position as center and s the distance selected between buoy dump, R represents maximum effect distance; Finally calculate the difference of ASCAT Wind Speed Inversion to be corrected and estimation error, this difference is revised ASCAT Wind Speed Inversion.
Effect is corrected in order to what check method described in above two kinds of embodiments to treat to correct ASCAT Wind Speed Inversion, adopt buoy dump dot cycle inspection, regard as by some buoy dumps and there is no buoy dump, the observational data of this buoy dump does not participate in calculating, the ASCAT Wind Speed Inversion of two kinds of methods to this buoy dump of above two embodiments is used to correct, the mean value of the ASCAT Wind Speed Inversion error of front and back will be corrected, the mean value of Error Absolute Value and root-mean-square error comparative analysis, weigh and correct effect, correction wind experiment and inspection is carried out based on 2010-2014 years ASCAT scatterometer WIND FIELDS data, result shows: adopt method revised ASCAT Wind Speed Inversion error described in above two kinds of embodiments compared with the ASCAT Wind Speed Inversion error before correcting, average error reduces 1.86m/s (67.9%) respectively, 1.74m/s (64.2%), mean absolute error reduces 1.05m/s (32.1%) respectively, 0.84m/s (32.1%), root-mean-square error reduces 1.19m/s (29.2%) respectively, 0.89m/s (29.6%).
The Offshore Winds product that the ASCAT WIND FIELDS data used in the present invention is 12.5km for resolution, buoy dump in selection area is totally 14 buoy dumps within the scope of Shanghai City, Zhejiang Province and Fujian Province; the air line distance of buoy dump and mainland coastline is 30 ~ 300km, and the minimum linear interval distance between two buoy dumps is 12km.
Claims (6)
1. a correction method for ASCAT Wind Speed Inversion, is characterized in that comprising the following steps:
1. the buoy dump Wind Speed Inversion that each buoy dump in acquisition selection area is secondary when difference is observed: for any one buoy dump in selection area, centered by this buoy dump and in the border circular areas being radius with preseting length L, obtain ASCAT Wind Speed Inversion secondary when observing with each on minimum 1 ~ 10 the ASCAT observation position of this buoy dump air line distance, then all ASCAT Wind Speed Inversion of during each observation acquired time are interpolated into the position at this buoy dump place by inverse distance weighting, obtain the buoy dump Wind Speed Inversion that this buoy dump is secondary when each observation,
2. the air speed error time series of each buoy dump in selection area is obtained: for any one buoy dump in selection area, using the 10 minute mean wind speeds of this buoy dump when each observation time as this buoy dump live wind speed secondary when correspondence is observed, then by this buoy dump each observe time time buoy dump Wind Speed Inversion and live wind speed subtract each other, obtain the air speed error of this buoy dump when correspondence is observed time, then the air speed error of this buoy dump when all observation time is formed an air speed error time series;
3. according to the air speed error time series of each buoy dump in selection area, calculate every two linear interval distances be less than setting air line distance D buoy dump air speed error time series between related coefficient, logarithm is adopted to carry out matching to the spacing distance between all related coefficients calculated and each self-corresponding adjacent floating labeling station of all related coefficients again, to obtain using the numerical value of spacing distance as X-axis and using the numerical value of related coefficient as the matched curve of Y-axis, then the numerical range of the numerical value 30km corresponding to the intersection point lower than matched curve and X-axis is defined as the selection range of maximum effect distance, any one value in the selection range of maximum effect distance is defined as maximum effect distance,
4. for an ASCAT Wind Speed Inversion to be corrected, by centered by the ASCAT observation position at this ASCAT Wind Speed Inversion place to be corrected, using all buoy dumps in maximum effect distance circular scope that is radius as selected buoy dump, then revised ASCAT Wind Speed Inversion is obtained according to selected buoy dump, detailed process is: ASCAT Wind Speed Inversion to be corrected substituted in the regression equation of each selected buoy dump and calculate, obtain the difference of result and the ASCAT Wind Speed Inversion to be corrected obtained by the regression equation calculation of each selected buoy dump, what difference corresponding for each selected buoy dump provided as the selected buoy dump by correspondence corrects value, the inverse distance weighting correcting value band maximum effect distance provided by all selected buoy dumps is weighted average computation, result weighted average calculation obtained corrects value as Wind Speed Inversion, finally calculate ASCAT Wind Speed Inversion to be corrected and Wind Speed Inversion correct value and value, should and be worth for revised ASCAT Wind Speed Inversion, wherein, for any one selected buoy dump, the process of establishing of its regression equation is: this has been selected buoy dump secondary buoy dump Wind Speed Inversion and live wind speed when all observation and formed a buoy dump wind speed time series, then set up the regression equation of this selected buoy dump according to buoy dump wind speed time series linear regression method,
Or detailed process is: obtain each selected buoy dump at air speed error secondary in time correcting the observation at ASCAT Wind Speed Inversion place, with the inverse distance weighting of band maximum effect distance, average computation is weighted to all air speed errors that during this observation time obtains again, result weighted average calculation obtained is as estimation error, finally calculate the difference of ASCAT Wind Speed Inversion to be corrected and estimation error, this difference is revised ASCAT Wind Speed Inversion.
2. the correction method of a kind of ASCAT Wind Speed Inversion based on buoy dump wind speed according to claim 1, in it is characterized in that described step is 1., the buoy dump Wind Speed Inversion that a buoy dump is secondary when observing for is designated as Zp,
wherein, n represents the sum for obtaining the ASCAT observation position of ASCAT Wind Speed Inversion required for this buoy dump, Z
irepresent the ASCAT Wind Speed Inversion that i-th ASCAT observation position is secondary when this observation, 1≤i≤n, d
irepresent as the distance between the buoy dump at center and i-th ASCAT observation position.
3. the correction method of a kind of ASCAT Wind Speed Inversion based on buoy dump wind speed according to claim 1, in it is characterized in that described step is 4., corrects the Wind Speed Inversion corresponding with ASCAT Wind Speed Inversion to be corrected of value and is designated as Zq,
wherein, m represents the sum of the selected buoy dump corresponding with ASCAT Wind Speed Inversion to be corrected, Z
jwhat an expression jth selected buoy dump provided corrects value, 1≤j≤m, d
jrepresent the ASCAT observation position as center and the individual distance selected between buoy dump of jth, R represents maximum effect distance.
4. the correction method of a kind of ASCAT Wind Speed Inversion based on buoy dump wind speed according to claim 1, in it is characterized in that described step is 4., is designated as Zr by estimation error corresponding for the ASCAT Wind Speed Inversion with to be corrected,
t represents the sum of the selected buoy dump corresponding with ASCAT Wind Speed Inversion to be corrected, Z
srepresent that s selected buoy dump is at air speed error secondary in time correcting the observation at ASCAT Wind Speed Inversion place, 1≤s≤t, d
srepresent the ASCAT observation position as center and s the distance selected between buoy dump, R represents maximum effect distance.
5. the correction method of a kind of ASCAT Wind Speed Inversion based on buoy dump wind speed according to claim 1, in it is characterized in that described step is 1., described preseting length L=50km.
6. the correction method of a kind of ASCAT Wind Speed Inversion based on buoy dump wind speed according to claim 1, in it is characterized in that described step is 3., described setting air line distance D=400km.
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Cited By (1)
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| CN110929776A (en) * | 2019-11-18 | 2020-03-27 | 杭州师范大学 | Remote sensing wind field data quality evaluation method and device based on sea surface wind field stability statistic zoning |
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