Variation quality control method based on three-dimensional variational assimilation
A quality control method and three-dimensional variational technology, applied in the field of numerical weather forecasting, to achieve the effect of improving utilization and improving accuracy
Pending Publication Date: 2021-12-10
NANJING UNIV OF INFORMATION SCI & TECH
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Therefore, the parameter configuration and minimization iterative stable convergence techniques used by existing methods are not necessarily applicable to 3D variational assimilation systems in WRF mode
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[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0038] A variational quality control method based on three-dimensional variational assimilation includes the following steps:
[0039] The first step is to subdivide the high-quality observations and outlier observations according to the probability of outliers, assuming that their errors obey the Gaussian distribution and the uniform distribution, respectively, to form the probability density of the observation errors obeying the Gaussian distribution and the unifo...
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The invention discloses a variation quality control method based on three-dimensional variational assimilation, and belongs to the field of numerical weather forecast. The method comprises the following steps: constructing a probability density function with observation errors obeying Gaussian distribution and uniform distribution, and constructing a new observation objective function, a gradient function and a weighting function of three-dimensional variational assimilation. According to the assimilation method integrating variational quality control and three-dimensional variational assimilation, variational quality control is synchronously carried out in the three-dimensional variational assimilation process, the assimilation observation quality is effectively identified, the observation weight with large deviation is reduced, the observation with small deviation and good quality is endowed with a large weight, and therefore, the quality of three-dimensional variational assimilation analysis cannot be damaged when bad data enter the assimilation system, and meanwhile, the quality of three-dimensional variational assimilation analysis can be effectively assimilated, absorbed, observed and improved.
Description
technical field [0001] The invention belongs to the field of numerical weather prediction, in particular to a variational quality control method based on three-dimensional variational assimilation. Background technique [0002] The variational quality control method is based on the three-dimensional variational assimilation method, assuming that the observation error obeys the non-Gaussian distribution model of "Gaussian distribution + uniform distribution" (uniform type for short), and forms variational quality control and three-dimensional variational quality control according to Bayesian probability theory. The assimilation method of assimilation; [0003] The probability density function of the observation error plays an important role in the three-dimensional variational assimilation theory, and its distribution and size have an important impact on the accuracy of the posterior analysis; assuming that they all obey the Gaussian distribution and have nothing to do with e...
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Login to View More IPC IPC(8): G01W1/10G06Q10/06
CPCG01W1/10G06Q10/06395
Inventor 和杰马旭林成魏
Owner NANJING UNIV OF INFORMATION SCI & TECH