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| Diagnosing a shortterm heavy rainfall process in Alxa League by non geostrophic wet Qvector |
| Yang Jiaqi |
| Alxa League Meteorological Bureau, Alxa League 750306 |
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Abstract Diagnostic analysis was conducted on the circulation background and physical quantities of the precipitation process in Alxa League on August 21,2022.The results showed that the main influencing systems of the precipitation process include the subtropical high pressure,700 hPa and 850 hPa shear lines,and surface cold front.Alxa League is located on the periphery of the subtropical high pressure,with abundant water vapor conditions and strong thermal instability conditions.The shear lines in the middle and lower troposphere and the surface cold front trigger short-term heavy precipitation under conditions of atmospheric baroclinic instability.By using non geostrophic wet Q-vectors and diagnosing precipitation processes,it was found that the vector arrows in the non geostrophic wet Q-vector flow field point to the area of precipitation,and the divergence convergence zone of the non geostrophic wet Q-vector corresponds well to the occurrence area of short-term heavy precipitation.The combination of these two physical quantities can provide better judgments on the development of the system.
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Received: 31 October 2024
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2025, Vol. 42 
