CN113917568A - Rainfall forecast capacity and remote correlation effect correlation method based on certainty coefficient - Google Patents
Rainfall forecast capacity and remote correlation effect correlation method based on certainty coefficient Download PDFInfo
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Abstract
The invention relates to the technical field of precipitation forecast, and provides a method for correlating precipitation forecast capacity and remote correlation action based on a certainty coefficient, which comprises the following steps: acquiring historical forecast precipitation data, observation precipitation data and a meteorological index sample sequence to obtain original sample data; establishing regression equations of the observed rainfall, the forecast rainfall, the meteorological indexes and a union set of the forecast rainfall and the meteorological indexes, and obtaining corresponding certainty coefficients through the regression equations respectively; respectively calculating the variance explained by the individually forecasted precipitation, the variance explained by the individually forecasted weather indicator and the variance repeatedly explained by the individually forecasted precipitation and the weather indicator based on set operation; processing the variance by using a bootstrap method to obtain reference distribution of the variance; and comparing the original sample data with the reference distribution of the variance to obtain a correlation result of the precipitation forecast capacity and the remote correlation effect, and effectively distinguishing the components of overlapping and difference in the precipitation forecast and the observed precipitation information provided by the meteorological factors.
Description
Technical Field
The invention relates to the technical field of precipitation forecast, in particular to a method for associating precipitation forecast capacity and remote correlation action based on a certainty coefficient.
Background
The accurate seasonal rainfall forecast has important value and wide application prospect in the fields of disaster prevention and reduction, water resource planning and management and the like of natural disasters such as flooding, drought and the like. Hercino-southern billows (El)Oscillotion, ENSO) phenomenon is an important driving factor for global seasonal precipitation abnormalities. Some studies will characterize meteorological factors of ENSO events (e.g.Andetc.) as a forecasting factor, and forecasting seasonal precipitation by utilizing the remote correlation effect of meteorological factors on precipitation. On the other hand, meteorological and Climate centers in many countries and regions of the world begin to develop respective Global Climate Models (GCMs) which characterize various key physical processes related to Climate, and the forecast results have clear physical meanings.
Although weather factors and GCM precipitation forecast can provide information for seasonal precipitation, in practical application of the information, it is difficult to judge whether the GCM seasonal precipitation with certain physical meanings includes information of key remote correlation; in different regions of the world, the information provided by the meteorological factor and the GCM seasonal precipitation is redundant to a certain extent, and the information provided by the meteorological factor and the GCM seasonal precipitation is redundant to a certain extent. In order to solve these problems, it is necessary to provide a simple and practical method for determining the overlap and difference between the two information, so as to provide a certain reference for using the forecast information in the actual service.
Disclosure of Invention
The invention provides a rainfall forecast capacity and remote correlation function association method based on a certainty coefficient, and aims to solve the problems of overlapping and difference of rainfall forecast and key remote correlation function information in a global climate model season.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a rainfall forecast capacity and remote correlation action correlation method based on certainty coefficients comprises the following steps:
s1, acquiring historical forecast precipitation data, observation precipitation data and meteorological index sample sequences to obtain original sample data;
s2, establishing regression equations of the observed precipitation, the forecast precipitation, the meteorological indexes and the union of the forecast precipitation and the meteorological indexes, and obtaining corresponding certainty coefficients through the regression equations respectively;
s3, respectively calculating the variance explained by the individually forecasted precipitation, the variance explained by the individually forecasted meteorological index and the variance repeatedly explained by the individually forecasted precipitation and the meteorological index based on set operation according to the certainty coefficient;
s4, processing the variances by using a bootstrap method to obtain reference distribution of the three variances;
and S5, comparing the original sample data with the reference distribution of the three variances to obtain a correlation result of the precipitation forecast capacity and the remote correlation action.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that: the invention combines the collective operation and the linear regression certainty coefficient, and simply and effectively distinguishes the overlapping and different components in the observed rainfall information provided by the rainfall forecast and the meteorological factor, thereby providing reference for the business use of the rainfall forecast.
Drawings
Fig. 1 is a flowchart of a method for associating precipitation forecast capacity with a remote correlation in embodiment 1.
FIG. 2 is DJFAnd the distribution diagram of the indexes and the observed precipitation correlation coefficient.
Fig. 3 is a spatial distribution diagram of deterministic coefficients.
FIG. 4 shows the forecast precipitation,Providing a spatial distribution map of the independent and overlapping components of the information.
FIG. 5 is a diagram of forecast precipitation sums on a global gridInformation incidence relation classification situation distribution diagram。
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
The present embodiment provides a method for associating a rainfall forecast capacity and a remote correlation based on a deterministic coefficient, as shown in fig. 1, which is a flowchart of the method for associating a rainfall forecast capacity and a remote correlation based on a deterministic coefficient.
The method for associating rainfall forecast capacity and remote correlation based on the certainty coefficient comprises the following steps:
and S1, acquiring historical forecast precipitation data, observation precipitation data and meteorological index sample sequences to obtain original sample data.
Wherein, the meteorological indexes contained in the obtained meteorological index sample sequence compriseAnd/orIn this embodiment, the selection is madeAs a meteorological index.
S2, establishing regression equations of the observed precipitation, the forecast precipitation, the meteorological indexes and the union of the forecast precipitation and the meteorological indexes, and obtaining corresponding certainty coefficients through the regression equations respectively.
In this step, the observation precipitation o is established respectivelykAnd forecast precipitation fkRegression equation of, observing precipitation okAnd weather indexesAnd observing the precipitation okAnd forecasting the union of precipitation and meteorological indexesFurther, the certainty coefficient determined by the above three regression equations is obtained.
Wherein the precipitation o is observedkAnd forecast precipitation fkIs determined by the regression equation of2The calculation formula of (o to f) is as follows:
in the formula okRepresents observed precipitation data of the k year, fkThe forecast rainfall data of the kth year is represented, and K is the total year number of the rainfall data; alpha is alpha1And beta1Is an intercept term and a slope term of the linear regression model; epsilon1,kResidual terms of the linear regression model;indicating the average observed precipitation over many years. Wherein the corresponding certainty factor can be obtained by comparing the sum of the squares of the residuals and observing the total variance of the precipitation.
By observing the precipitation okAnd weather indexesIs determined by the regression equationThe calculation formula of (a) is as follows:
in the formula (I), the compound is shown in the specification,in the k yearSequence of meteorological index samples, alpha2And beta2Is an intercept term and a slope term of the linear regression model; epsilon2,kThe residual terms of the linear regression model.
By observing the precipitation okAnd forecasting the union of precipitation and meteorological indexesIs determined by the regression equationThe calculation formula of (a) is as follows:
in the formula, alpha3Is the intercept term of a linear regression model, beta3,1And beta3,2Is the slope term of the linear regression model. Wherein the corresponding certainty factor can be obtained by comparing the sum of the squares of the residuals and observing the total variance of the precipitation.
And S3, respectively calculating the variance explained by the independently forecasted precipitation, the variance explained by the independently forecasted meteorological index and the variance repeatedly explained by the independently forecasted precipitation and the meteorological index based on set operation according to the certainty coefficient.
The expression formula of the variance explained by the individual forecasted precipitation is as follows:
the expression formula for the variance, interpreted by the weather indicator alone, is as follows:
the expression formula of the variance repeatedly explained by the forecast precipitation and meteorological indexes independently is as follows:
and S4, processing the variances by using a bootstrap method to obtain reference distributions of the three variances.
In this embodiment, the step of processing the variance by using a bootstrap method includes: and (3) disturbing the historical forecast precipitation data and the meteorological index sample sequence, and repeatedly executing the steps from S2 to S3 to obtain corresponding three variances until the preset iteration times are reached to obtain the reference distribution of the three variances.
In the present embodiment, the number of iterations is set to 1000.
And S5, comparing the original sample data with the reference distribution of the three variances to obtain a correlation result of the precipitation forecast capacity and the remote correlation action.
In this step, original sample data is compared with reference distributions of three variances by a single-side inspection method. Wherein, the step of comparing the original sample data with the reference distribution of the three variances comprises: selecting a significance level, typically 0.1, 0.05 and 0.01, corresponding to a reference distribution threshold of 90, 95 and 99 percentiles of the reference distribution, respectively; when the significance level is set to 0.1, an original sample data value is deemed significant if it is greater than the 90 th percentile of its reference distribution of corresponding variances, otherwise it is deemed insignificant. And then outputting the significance result as a result of the correlation between the rainfall forecast capacity and the remote correlation action.
In one implementation, there are 8 significant results, which are specifically shown in table 1 below.
TABLE 1 Association relationships represented by eight different combinations
Wherein, a notation of 1 indicates that the original sample data value is considered significant at the corresponding certainty factor, and a notation of 0 indicates that the original sample data value is considered insignificant at the corresponding certainty factor.
In the embodiment, the set operation is combined with the linear regression deterministic coefficient, and a bootstrap method and a unilateral test method are further combined, so that the overlapping and difference components in the observed rainfall information provided by the rainfall forecast and the meteorological factors are simply and effectively distinguished, and a reference is provided for the business use of the rainfall forecast.
Example 2
This example is based on the method for correlating precipitation forecast capacity with the remote correlation proposed in example 1.
The method takes the global season grid precipitation data of the United states climate forecasting center (CPC)1982-2010 as observation data, takes the second generation climate forecasting system CFSv2 of the United states environment forecasting center (NCEP) as forecast precipitation data, and takes the second generation climate forecasting system CFSv2 of the United states environment forecasting center as forecast precipitation dataThe index indicates the ENSO phenomenon. Wherein, the CFSv2 forecast precipitation adopts 0 month forecast season precipitation. Take winter (December-January-February, DJF) as an example. The spatial resolution of observed precipitation and forecast precipitation is 1 degree multiplied by 1 degree.
As shown in FIG. 2, is DJFAnd the distribution diagram of the indexes and the observed precipitation correlation coefficient. As can be seen from the figure, obvious remote correlation effects appear in many areas in the global range, but the effects are very different in different areas and show obvious spatial correlation. For example, in the south of north america,the index is positively correlated with the precipitation in the region, the precipitation in the region is more in early-nino years, and the precipitation in the region is less in lanina years. In contrast, in the north of south america,the indexes are in negative correlation with the precipitation in the area, which shows that the climate is dry in early nino and wet in lanina.
For the precipitation of each grid in FIG. 2, the observed precipitation and the forecast precipitation are established separately,The indexes and the regression equation between the two union sets are respectively calculated to obtain corresponding certainty coefficients R2(o~f),And
as shown in fig. 3, are three deterministic coefficients R2(o~f),Andthe global distribution of each. As can be seen from the graph, in some regions, the information provided by the forecast and the information provided by the forecastThe information provided is of comparable size and spatial distribution, with some overlap possible, e.g., in the south of north america, in the north of south america, in the east of africa, etc. In addition, the partial area forecast can provide more information, such as northern europe, northern asia, southeast australia, and so on. There is also a portion of the area,more information may be provided, such as western australia. Overall, when the union of the two is used as an interpretation variable, the most information can be interpreted (i.e. the last row of subgraph in fig. 3).
For quantitatively forecasting precipitationRespectively providing information and overlapped information, and further obtaining overlapped R by using a set operation method2And each independently R2. As shown in fig. 4, is the result of a collective operation, i.e.Spatial distribution of the three variances. The distribution diagram shown in fig. 4 well distinguishes partial variances of the independent interpretation of the forecast precipitation, mainly in the northern part of the asian continent, the southeast part of australia, the west part of africa and the east part of africa. WhileThe information provided by the index is mainly distributed in the western Australia and the south Africa. Finally, the overlapping regions are mainly distributed in the south north america, the north south america, the south southeast america, the east africa, and parts of the south africa and east asia. The graphic results well confirm the expectation of fig. 3, which shows that the rainfall forecast capacity and the remote correlation effect correlation method provided by the invention can effectively distinguish forecast capacity and remote correlation effectThe indicators each provide information.
Further, the present embodiment applies to three sets of variances determined according to the deterministic coefficient Significance tests were performed separately. There are eight different combinations of three significant results, as shown in table 1.
As shown in FIG. 5, for forecasting precipitation on the world gridThe incidence relation of the information classifies the situation distribution diagram, and displays the distribution of eight different situations on the space. The three digits in the legend correspond to the significance results given in Table 1, where the number 1 represents significance and the number 0 represents no significance, respectively, where the first digit representsOf significance, second digit representationOf significance, the third digit isThe significance of (a). The distribution map gives the final CFSv2 forecast precipitation sumThe difference and overlap of the respective provided information between the indices. For example, the "010" grid, i.e. forecasting precipitation andthe indicators both provide information on the observation of precipitation, and the information of both is overlapping. Such grids are distributed mainly in the south of north america, the north of south america, and the south of east americaEastern and southern africa, parts of east asia.
Further, as shown in fig. 6, the difference and overlap of the information are shown by the wien diagram. From the eight classification cases obtained, one grid was randomly drawn (grid positions are indicated in capital letters in the distribution diagram of FIG. 2), and the predicted precipitation for each grid were calculatedThe information provided is represented by a wien diagram. R of forecast precipitation represented by a yellow dotted circle in the figure2I.e. R2(o-f), the gray solid line circles representR of index2I.e. byThe white part of the two overlapping isThe non-overlapped parts of the two are respectivelyAndthe total area of the three parts being The Wien diagram of FIG. 6 is a good representation of the relationship between information, such as the D-grid (011), that the forecasting capability provides almost entirelyThe information provided by the indicator is fully contained, indicating that on this grid,the metrics can provide more information, while the predictive capability does not provide information beyond the far correlation. While the G grid (110) is reversed,the information of the index is fully contained in the information provided by the forecast.
The experimental results show that the rainfall forecasting capacity and the remote correlation effect correlation method based on the certainty coefficient can effectively forecast rainfall and forecast rainfallThe difference and the overlap between the information provided by the indexes can intuitively show different incidence relation classification conditions, and can provide reference for the use of the forecasted business.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A rainfall forecast capacity and remote correlation action correlation method based on certainty coefficients is characterized by comprising the following steps:
s1, acquiring historical forecast precipitation data, observation precipitation data and meteorological index sample sequences to obtain original sample data;
s2, establishing regression equations of the observed precipitation, the forecast precipitation, the meteorological indexes and the union of the forecast precipitation and the meteorological indexes, and obtaining corresponding certainty coefficients through the regression equations respectively;
s3, respectively calculating the variance explained by the individually forecasted precipitation, the variance explained by the individually forecasted meteorological index and the variance repeatedly explained by the individually forecasted precipitation and the meteorological index based on set operation according to the certainty coefficient;
s4, processing the variances by using a bootstrap method to obtain reference distribution of the three variances;
and S5, comparing the original sample data with the reference distribution of the three variances to obtain a correlation result of the precipitation forecast capacity and the remote correlation action.
3. The method of claim 2, wherein the deterministic coefficient R is determined by regression equations of observed precipitation and forecasted precipitation2The calculation formula of (o to f) is as follows:
in the formula okRepresents observed precipitation data of the k year, fkThe forecast rainfall data of the kth year is represented, and K is the total year number of the rainfall data; alpha is alpha1And beta1Is an intercept term and a slope term of the linear regression model; epsilon1,kResidual terms of the linear regression model;indicating the average observed precipitation over many years.
4. The method of claim 3, wherein the deterministic coefficient is determined by observing regression equations of precipitation versus meteorological parametersThe calculation formula of (a) is as follows:
5. The method of claim 4, wherein the deterministic coefficient is determined by a regression equation of the union of observed precipitation and forecasted precipitation and meteorological parametersThe calculation formula of (a) is as follows:
in the formula, alpha3Is the intercept term of a linear regression model, beta3,1And beta3,2Is the slope term of the linear regression model.
6. The method of associating precipitation forecast capacity with remote correlation according to claim 5, wherein in step S3, the expression formula of the variance explained by forecast precipitation alone is as follows:
the expression formula for the variance, interpreted by the weather indicator alone, is as follows:
the expression formula of the variance repeatedly explained by the forecast precipitation and meteorological indexes independently is as follows:
7. the method for correlating precipitation forecast capacity with telemetry functions according to any one of claims 1-6, wherein the step of processing the variance by using a bootstrap method comprises: and (3) disturbing the historical forecast precipitation data and the meteorological index sample sequence, and repeatedly executing the steps from S2 to S3 to obtain corresponding three variances until the preset iteration times are reached to obtain the reference distribution of the three variances.
8. The method of claim 7, wherein in step S5, the original sample data is compared with the reference distribution of three variances by a single-edge test.
9. The method of claim 8, wherein the step of comparing the original sample data with the reference distribution of three variances in step S5 comprises: selecting a level of significance and determining a reference distribution threshold based on the selected level of significance; if the original sample data value is larger than the reference distribution threshold value of the corresponding variance, the original sample data value is determined to be significant, otherwise, the original sample data value is determined to be not significant; and then outputting the significance result as a result of the correlation between the rainfall forecast capacity and the remote correlation action.
10. The method of correlating precipitation forecast capabilities with telemetry-related actions according to claim 9, further comprising the steps of: and comparing the original sample data with the reference distribution of the three variances to obtain a significance result, and displaying the significance result through a chart.
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