South China Sea typhoon scale-division mixed vortex initial field construction method

Abstract

The invention relates to a vortex initial field construction method for scale-division mixing of typhoons in the South China Sea. The vortex initial field construction method comprises the following steps: establishing a typhoon sample library in combination with typhoon observation information and a high-resolution reanalysis field; selecting an optimal sample through a sample library in combination with a South China Sea typhoon mode and numerical simulation; extracting typhoon vortex circulation with three intensities by combining the optimal sample with the strong wind radius and the wind speed of typhoon, and obtaining a synthetic vortex model; respectively filtering the high-resolution reanalysis field and the synthetic vortex model, and separating each part of the two fields into a large-scale average field and a small-scale disturbance field; superposing the small-scale disturbance field of the high-resolution reanalysis field and the small-scale disturbance field of the synthetic vortex model according to a certain weight to obtain a final small-scale disturbance quantity; and adding the final small-scale disturbance quantity and a large-scale average field separated from the high-resolution reanalysis field to obtain a vortex initial field, reserving main characteristics of a large-scale environment field, reserving specific typhoon vortex personality characteristics, and introducing South China Sea typhoon vortex structure generality characteristics.

Description

technical field [0001] The invention relates to the field of meteorology, and more specifically, to a method for constructing an initial field of a vortex for sub-scale mixing of typhoons in the South China Sea. Background technique [0002] Typhoon is one of the main meteorological disasters in my country. In recent years, the level of numerical forecasting of typhoon track has been greatly improved, but there are still some typhoons every year, and the forecast track error is very large, causing huge losses. For example, the "1213" tropical cyclone "KAI-TAK" has a 24-hour track error of more than 300km and a 48-hour track error of more than 500km, causing 1 death, 2 missing, and 526,000 people in the three provinces of Guangdong, Guangxi, and Hainan. Emergency transfers affected 110,000 people in Guangxi and 1.74 million people in Guangdong, with direct economic losses of nearly 2 billion yuan. The initial intensity of the typhoon in the South China Sea was weak, but duri...

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Problems solved by technology

[0006] In order to solve the technical defects that the existing typhoon initial vortex model is not suitable for the South China Sea and the typhoon forecast error is large, the present invention provides a vortex initial field construction method for South China Sea typhoon sub-scale mixing

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