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Method for automatically identifying melting layer by using S-band dual-polarization radar

An automatic identification, dual polarization technology, applied in the field of atmospheric science, which can solve the problems of low identification efficiency, low height of the bottom of the melting layer, and large error of the top of the melting layer.

Pending Publication Date: 2022-06-28
山东省气象科学研究所山东省海洋气象科学研究所山东省气象局培训中心
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Problems solved by technology

[0005] Aiming at the problems that MLDA is used in my country's Doppler S-band dual-polarization radar to identify the melting layer, such as the problems of large error in the identification of the top of the melting layer, low height of the bottom of the melting layer and low recognition efficiency, the present invention provides a method using The Method of Automatic Identification of Melting Layer by S-band Dual Polarization Radar

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  • Method for automatically identifying melting layer by using S-band dual-polarization radar
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  • Method for automatically identifying melting layer by using S-band dual-polarization radar

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Embodiment 1

[0029] In order to check the recognition effect of the existing MLDA on the melting layer and find out the problems and deficiencies of MLDA, this embodiment uses the Doppler S-band dual-polarization radar volume scan data of Jinan and Qingdao stations to carry out the recognition test. Since the melt layer usually appears in the stratiform cloud precipitation area, the data of the stratiform cloud precipitation period in Jinan and Qingdao from July to August 2020 were selected. The specific time is shown in Table 1.

[0030] Table 1 Period of stratiform cloud precipitation in Jinan and Qingdao from July to August 2020

[0031] site Strata Cloud Precipitation Period (UTC) site Stratospheric Time Period (UTC) Z9531 July 2 07:59:48-3 July 01:02:05 Z9532 July 11th 15:57:22-12th 06:58:35 Z9531 July 8th 22:59:57-9th 05:59:48 Z9532 July 18th 16:58:05-19th 09:59:02 Z9531 July 11 10:00:19-23:00:25 Z9532 July 21st 18:58:39-22nd 17:02:15 Z9...

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Abstract

The invention discloses a method for automatically identifying a melting layer by using an S-band dual-polarization radar, and the method improves an existing MLDA identification method, and comprises the steps: adding a radial continuity test on the basis of carrying out the melting layer identification on a radar scanning azimuth angle, increasing the elevation angle of 3.3 degrees in a scanning range during the determination of a melting layer region, and carrying out the recognition of the melting layer through the S-band dual-polarization radar. And the threshold value of the total number of distance libraries for judging the occurrence of the melting layer is adjusted. According to the method, the influence of non-rainfall echoes such as clear sky and ground features on MLDA recognition of the melting layer can be removed to a certain extent, the top height deviation of the recognized melting layer is small, and the bottom height of the melting layer is within a reasonable range; moreover, the adjusted parameters are more suitable for Doppler S-band dual-polarization radars in China, and the recognition efficiency is far higher than that of the original MLDA.

Description

technical field [0001] The invention relates to the technical field of atmospheric science, in particular to a method for automatically identifying a melting layer by using an S-band dual-polarization radar. Background technique [0002] The melting layer is the area where the solid and liquid hydrometeors are converted in the atmosphere. The top of the melting layer is usually the lowest height where the 0°C isotherm is located. Above the melting layer is mainly solid hydrometeor, and below it is mainly liquid hydrometeor. The melting layer has played an important role in many business applications. For example, the melting layer top can be used to classify the phase state of hydrometeors. For some hydrometeors, such as dry snow and moderate (light) rain, the radar parameter characteristics are roughly the same. The height of the melting layer top is used. can be effectively distinguished. The error of the radar quantitative estimation of precipitation in the bright band r...

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Application Information

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IPC IPC(8): G01S13/95G01S7/02
CPCG01S13/95G01S7/02Y02A90/10
Inventor 夏凡吴伟吴举秀李长军王俊
Owner 山东省气象科学研究所山东省海洋气象科学研究所山东省气象局培训中心