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GIIRS observation area atmospheric profile set sampling method based on Shannon entropy

A technology of observation area and Shannon entropy, which is applied in the field of profile set sampling, can solve problems such as differences in units and variation ranges, huge changes in atmospheric variables, and complex sampling processes, and achieve the effect of maintaining uniformity

Pending Publication Date: 2021-04-30
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

The first challenge is that the atmosphere has multivariate characteristics (such as temperature, humidity, and 2-meter surface temperature, etc.), which complicates the sampling process. Dimensions up to hundreds
The second challenge is that the values ​​of atmospheric variables vary greatly from the lower to the upper layers of the atmosphere, and there are differences in units and ranges between different variables
The currently published results show that the Shannon entropy sampling method has not been applied to construct the atmospheric profile set of the observation area of ​​the China Fengyun geostationary satellite infrared hyperspectral GIIRS instrument

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  • GIIRS observation area atmospheric profile set sampling method based on Shannon entropy
  • GIIRS observation area atmospheric profile set sampling method based on Shannon entropy
  • GIIRS observation area atmospheric profile set sampling method based on Shannon entropy

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[0047] In order to enable those skilled in the art to better understand the technical content of the present invention, specific embodiments are given and described as follows in conjunction with the accompanying drawings. Some aspects of the present disclosure may be used alone or in any suitable combination with other aspects of the present disclosure.

[0048] In order to construct an atmospheric profile data set of China Fengyun 4A geostationary satellite infrared hyperspectral (Geosychronous Interferometric Infrared Sounder, GIIRS) instrument observation area, and promote the development of radiative transfer models or inversion algorithms in the numerical simulation application of GIIRS instruments, the European medium-term weather The European Center for Medium-Range Weather Forecasts (ECMWF) reanalysis data set of the fifth edition (ERA5) is a sample data set. On the basis of considering the monthly changes of the surface and atmosphere, the Shannon entropy sampling met...

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Abstract

The invention discloses a GIIRS observation area atmospheric profile set sampling method based on Shannon entropy. The method comprises the following steps: S1, constructing a GIIRS observation area basic atmospheric data set; S2, dividing the ground surface of the GIIRS observation area into a plurality of different ground surface types, and correspondingly dividing the basic data set of the GIIRS observation area into different atmospheric data sets according to the ground surface types; S3, dividing each data set obtained in the step S2 into atmosphere sub-data sets by months; S4, randomly selecting h profiles from each sub-data set, and constructing an initial sampling profile set of the GIIRS observation area; S5, utilizing the initial profile set of the GIIRS observation area to construct an optimized profile set of the GIIRS observation area; and S6, performing statistical test on the optimized profile set in step S5. On the basis of combining factors of surface types and atmospheric monthly changes, a Shannon entropy sampling method is applied to construct a GIIRS observation area profile data set, and the problem that it is difficult for a profile database publicly published at present to accurately characterize atmospheric change characteristics of an infrared hyperspectral GIIRS observation area is solved.

Description

technical field [0001] The invention relates to the field of profile set sampling methods, in particular to a method for sampling atmospheric profile sets in GIIRS observation areas based on Shannon entropy. Background technique [0002] The static interferometric infrared sounder (GIIRS) on China's new generation of geostationary meteorological satellite Fengyun 4A is the first infrared hyperspectral instrument on a geostationary satellite orbit platform, which can obtain high-frequency three-dimensional information of the atmosphere on a regional scale and realize continuous Monitor the vertical structure of the atmosphere and capture the horizontal and vertical development status of strong impact weather events. Different from the Atmospheric Infrared Sounder (AIRS), Infrared Atmospheric Sounding Interferometer (IASI) and Cross-orbit Scanning Infrared Atmospheric Sounder (CrIS) instruments that cover the global detection area of ​​polar orbiting meteorological satellites ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3504
CPCG01N21/3504Y02A90/10
Inventor 余意张琪张卫民罗藤灵史华湘吴建平赵延来马烁王舒畅
Owner NAT UNIV OF DEFENSE TECH
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