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Automatic identification and drawing of low-level jet streams based on wind field information of MICAPS

A technology of automatic identification and rapid flow, applied in the direction of informatics, special data processing applications, instruments, etc., can solve problems such as low efficiency

Inactive Publication Date: 2016-04-06
TIANJIN UNIV
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  • Claims
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Problems solved by technology

Therefore, the current identification of low-altitude jets is still based on manual identification based on the MICAPS platform, which is inefficient and has many subjective factors

Method used

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  • Automatic identification and drawing of low-level jet streams based on wind field information of MICAPS
  • Automatic identification and drawing of low-level jet streams based on wind field information of MICAPS
  • Automatic identification and drawing of low-level jet streams based on wind field information of MICAPS

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Embodiment Construction

[0052] The automatic identification and drawing of low-level jets based on the wind field information of the MICAPS system mainly includes the following steps.

[0053] Step 1 Automatic Station Extraction:

[0054] The data in this article are worldwide. Since this article mainly studies the low-level jets in the eastern coastal areas of China, the effective area of ​​the jets is limited to 3°N-53°N, 100°E-125°E and 40°N-53N °, within the range of 125° east longitude - 135° east longitude. Automatic station selection is to extract all automatic stations with wind speed greater than 12 m / s and wind direction of southwest wind, westerly wind, southeast wind and easterly wind in the effective area of ​​jet stream.

[0055] Step 2 preprocessing:

[0056]To analyze the low-altitude jet, it is necessary to find the automatic station located in the geometric center of the windy area, so the pre-selected automatic station should be preprocessed first to filter out the interference p...

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Abstract

The invention relates to the technical field of mesoscale weather forecasts, utilizes conventional observational data, encrypts data of automatic stations and wind field information of an MICAPS (Meteorological Information Comprehensive Analysis and Process System), and combines low-level jet characteristics, so as to realize automatic identification of low-level jet streams at the 850hPa isobaric surface in coastal areas of Eastern China. The invention adopts a technical scheme that automatic identification and drawing of low-level jet streams based on the wind field information of the MICAPS comprise the following steps: step 1, extraction of automatic stations; step 2, preprocessing; step 3, clustering; step 4, fitting; after clustering is terminated, each cluster represents one jet stream, and in order to directly showing jet streams, fitting should be performed for the clustered automatic stations, polyline fitting is performed firstly, and then polyline smoothing is performed. The invention is mainly applied to weather forecasts.

Description

technical field [0001] The invention relates to the technical field of mesoscale weather forecasting, in particular to the automatic identification and drawing of low-altitude jets based on the wind field information of the MICAPS system. Background technique [0002] The jet stream is a strong and narrow airflow belt. At present, my country's meteorological community usually defines the wind speed belt below 600hPa and the wind speed greater than or equal to 12 m / s as the low-level jet stream. The reason why low-level jet streams have been paid more and more attention by scholars is that it is closely related to heavy rain, heavy snow and other strong convective weather, aviation safety, and the accuracy of rocket and missile launches. According to statistics, most of the heavy rains during the flood season in South China, the Meiyu in the Yangtze River Basin, and the heavy rains (snowstorm) in North China are accompanied by low-level jets, and most of the heavy rains occur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 路志英刁长莹李鑫
Owner TIANJIN UNIV
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