ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Analysis on Continuous Rainfall in Early Summer of Shaanxi Province Through Evolution of Anticyclone
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Abstract:
As a major weather case, few continuous rainfall process happens in early summer (in June) in history of Shaanxi Province. The probability of continuous rainfa ll occurrences is much higher in the region of Guanzhong and southern Shaanxi Pr ovince about every three or four years than that is in the region of Shanbei Lo ess Plateau. In June, 2007, an abnormal continuous rainfall process occurred in the whole region of Shaanxi Province, which lasted for seven days. Based on the NCEP/NCAR reanalysis data, this continuous rainfall process was studied. The res ult showed that this was a process of occurrence, maintaining and disappearance of anticyclone circulation. In this process, Shaanxi Province was at the bottom of this anticyclone, and the east (southeast) wind provided favorable moisture f or the continuous rainfall maintaining. Vertical ascending motion happened throughout the whole process. The main synoptic systems were steady Mongolian trough and QinghaiTibet Plateau trough which caused the continuous rainfall.The south wind in the front of QinghaiTibet Plateau trough and north wind in the front of Mongolian trough converged on the Hetao Area, wh ich located in the north of 35°N.That was the main reason for the occurrence of the continuous rainfall in Shanbei drought region. Before the process of this c ontinuous rainfall, the establishment of “double blocking high" in East Asian w as the strong signal for the rainy period of Shaanxi Province.
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