An Automatic Recognition Method for Airflow Field Structures of Convective Systems Based on Single Doppler Radar Data
Autor: | Hou Jinyi, Wang Ping, Dou Bingjie, Kai Gu |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Convection
Atmospheric Science 010504 meteorology & atmospheric sciences Acoustics convective systems Doppler radar Airflow Environmental Science (miscellaneous) lcsh:QC851-999 010502 geochemistry & geophysics 01 natural sciences law.invention law 0105 earth and related environmental sciences Convection cell airflow intensity airflow field Cyclonic rotation Dissipation airflow type single doppler radar lcsh:Meteorology. Climatology automatic recognition Rotation (mathematics) Squall line Geology |
Zdroj: | Atmosphere, Vol 11, Iss 2, p 142 (2020) Atmosphere Volume 11 Issue 2 |
ISSN: | 2073-4433 |
Popis: | Airflow structures within convective systems are important predictors of damaging convective disasters. To automatically recognize different kinds of airflow structures (the convergence, divergence, cyclonic rotation, and anticyclonic rotation) within convective systems, an airflow structure recognition method is proposed, in this paper, based on a regular hexagonal template. On the basis of single Doppler radar data, the template is designed according to the appearance model of airflows in radial velocity maps. The proposed method is able to output types and intensities of airflow structures within convective systems. In addition, the outputs of the proposed method are integrated into a projection map of the airflow field structure types and intensities (PMAFSTI), which is developed in this work to visualize three-dimensional airflow structures within convective cells. The proposed airflow structure automatic recognition method and the PMAFSTI were tested using three typical cases. Results of the tests suggest the following: (1) At different evolution stages of the convective systems, e.g., growth, split, and dissipation, the three-dimensional distribution of the airflow fields within convective systems could be clearly observed through the PMAFSTI and (2) on the basis of recognizing the structures of the airflow field, the complex airflow field, such as a squall line, could be further divided into several small parts making the analysis of convective systems more scientific and elaborate. |
Databáze: | OpenAIRE |
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