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An ECMWF Water Vapor Space Encryption Algorithm Based on the Idea of ​​Boundary Layer Scaling

An encryption algorithm and boundary layer technology, applied in the field of meteorology, can solve problems such as limitations of conventional space encryption algorithms

Inactive Publication Date: 2017-05-03
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, conventional spatial encryption algorithms are greatly limited here

Method used

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  • An ECMWF Water Vapor Space Encryption Algorithm Based on the Idea of ​​Boundary Layer Scaling
  • An ECMWF Water Vapor Space Encryption Algorithm Based on the Idea of ​​Boundary Layer Scaling
  • An ECMWF Water Vapor Space Encryption Algorithm Based on the Idea of ​​Boundary Layer Scaling

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 The space encryption method of ECMWF air pressure and temperature

[0042] ECMWF is an international official organization composed of more than 30 countries or states. It absorbs a variety of ground and satellite meteorological data around the world, and releases global meteorological product data every 6 hours. At present, ECMWF can provide meteorological data of 37 pressure layers, up to 50km above the surface. The space encryption of air pressure and temperature in the present invention utilizes the surface level data of ECMWF.

[0043]ECMWF publishes global data with grid points of a certain spatial resolution, and the surface temperature and pressure at each grid point are the average values ​​of temperature and pressure on different terrains within the resolution unit. In order to realize the encryption of surface temperature and pressure at any point, the empirical value T of surface temperature and pressure at the ECMWF grid point is obtained firs...

Embodiment 2

[0053] Embodiment 2 Water vapor space encryption based on the idea of ​​boundary layer expansion and contraction

[0054] Based on the idea of ​​boundary layer stretching and encryption, it is first assumed that the water vapor content in the atmosphere is only affected by terrain fluctuations in the boundary layer at a certain height above the earth's surface. See figure 2 , and beyond a certain height, the atmospheric water vapor content will have nothing to do with terrain relief.

[0055] According to the principle of ideal physical conservation flow, if the resolution unit is not affected by special water vapor, it is considered that the water vapor density and temperature profile at the height above the boundary layer remain unchanged in the original state of ECMWF, that is, it is not affected by terrain fluctuations, but only The water vapor density and temperature profiles below the boundary layer are affected by topography. According to the water vapor value of the ...

Embodiment 3

[0069] Example 3 Algorithm Validity Test and Characteristic Analysis

[0070] Through the research on the expansion and encryption idea of ​​the atmospheric water vapor boundary layer, the corresponding program was written according to the above steps, and the call and matching of ECMWF data, the output of multi-type and multi-format results were automatically realized, which facilitated the use of results and the call of other software and read.

[0071] In order to verify the validity and accuracy of the algorithm model, the present invention utilizes water vapor data and measured values ​​of surface air pressure and temperature from 94 GPS continuous observation stations covering the European continent, and the time used is the data from June to July 2009. Since the changes of atmospheric water vapor content, surface pressure and surface temperature in the northern hemisphere are relatively active in summer, the validity and accuracy of SBLM can be fully tested by using the...

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Abstract

The invention discloses an ECMWF water vapor space encryption algorithm based on the boundary layer stretching idea. An ECMWF grid resolution cell to which a point to be encrypted belongs is calculated and determined based on the coordinates of the point, and water vapor density and atmospheric temperature profile data of all air pressure layers of the ECMWF grid resolution cell and surrounding grid cells thereof is extracted; the gravitational potential of the ECMWF grid resolution cell to which the point to be encrypted belongs is extracted, and the original profile of water vapor density and temperature is intercepted according to the gravitational potential; and the surface temperature and the estimated value of pressure of the encrypted point are acquired based on a pressure and temperature space encryption method and encrypted point elevation calculation. A spatial interpolation model SBLM based on a boundary layer stretching algorithm is established, a corresponding piece of software is programmed, and an algorithm result is verified by combining measured GPS and surface meteorological data. The results show that PWV, P and T calculated based on the SBLM are highly accurate.

Description

technical field [0001] The invention belongs to the technical field of meteorology, and relates to an ECMWF water vapor space encryption algorithm based on the concept of boundary layer expansion and contraction. Background technique [0002] Atmospheric precipitable water volume (PWV) is an important element in meteorological forecast, and the abnormal circulation of atmospheric water vapor is an important cause of meteorological disasters. Therefore, the study of the spatial distribution and variation of atmospheric water vapor is of great significance to meteorological disaster forecasting. The European Center for Mesoscale Meteorological Forecasting (ECMWF) represents the highest level of short- and medium-term numerical weather forecasting in the world. It can provide four times a day with global grid point numerical meteorological and water vapor data, which is playing an increasingly important role in regional weather forecasting. It has also been studied by more and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01W1/10
CPCG01W1/10Y02A90/10
Inventor 杨成生张勤赵超英李振洪
Owner CHANGAN UNIV