| Autor: |
WANG Hongyan, CHEN Haishan, WANG Jun, WANG Di |
| Předmět: |
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| Zdroj: |
China Sciencepaper; 2020, Vol. 15 Issue 5, p563-576, 14p |
| Abstrakt: |
Based on observation data of dense automatic meteorological stations, conventional radio-soundings, meteorological satellite, Doppler weather radar, and combined with European Center for Medium-Range Weather Forecasts (ECMWF) 6 hours re-analysis data (0.25° X 0.25°), the mesoscale environmental fields and its mainly characteristics of extremely rainstorm in eastern Henan province produced by Typhoon "Rumbia" (1818) which deeply entered Henan province in 2018 were analyzed, and the physics causes of extremely rainstorm were also preliminary explored. The results indicate that extremely rainstorm areas located the superposition of 700 hPa warm advection and positive differential vorticity advection between 500 hPa and 850 hPa, and with large humidity in middle-low level and surface layer, obvious convective instability energy in upstream of rainstorm areas. Strong bow echo band in radar echo reflectivity and a corresponding strong northeasterly and southeasterly winds in radar radial velocity in low level and a relating high value band of vertical integrated liquid water were stable lasting for a long time during the extremely rainstorm. Strong water vapor transport zones which formed by downwards development of southeast or south jet streams during the strong rainfall provide the Water vapor source for extremely rainstorm. There are strong water vapor convergence in middle-low level and strong water vapor divergence in high level at extremely rainstorm areas. The effect of the eastern stream with high moist and convective unstable characteristics was uplifted and obstructed by Taihang Mountains, which was one of the important reasons for the formation of typhoon torrential rain. The combinational development of the southerly flow in the western and northern side of typhoon system and the strong southwesterly stream at levels of 150-250 hPa has an indicative role for the changes of steering flow and track turning of typhoon system. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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