ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Objective Identification Research on China Northeast Cold Vortex Precipitation Period
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Abstract:
Based on the requirement of objective identification and monitoring to key weather process, and the fact that the rainy season of Northeast China includes cold vertex precipitation, and using the daily precipitation data of 147 observing stations in Northeast China, this paper comprehensively analyzed the daily precipitation series disposed by 5 d moving average. Also, the contrast test of the daily moving average precipitation in the former years was designed. The threshold,duration as well as the criterion of onset and end dates cold vortex precipitation period in the Northeast China were confirmed. Then, based on the NCEP/NCAR daily reanalysis data of wind field and geopotential height field, the atmospheric circulation fields at different levels before, during and after the cold vortex precipitation period were analyzed, and the rationality of the criterion was validated. The objective identification method shows that the average onset date of the cold vortex r precipitation period in Northeast China is 26 May. The analysis of midsummer precipitation period reveals that the average end date of the cold vortex precipitation period is 25 June.
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