Analysis on the Circulation Characteristicsof Summer Precipitation Conversion in North China
Abstract: In this paper, a comprehensive analysis on decadal shift of precipitation rainfall pattern and cir-culation characteristics during summer in North China is made based on such data as daily preci-pitation, general atmospheric circulation reanalyzed by NCEP/NCAR. The results of the analysis indicate that: 1) The shift of precipitation rainfall pattern during summer in Eastern China can be divided into 5 periods, i.e., 1961-1965 with significantly more rainfall both in North China and Northeast China, 1966-1980 with more rainfall in North China but normally less rainfall in North-east China, 1981-2000 with more rainfall in Northeast China but normally less rainfall in North China, 2001-2010 with less rainfall in North China and Northeast China but significantly more rainfall in Huaihe River Basin, and 2011-2013 with more rainfall in North China and Northeast China but less rainfall in Yangtze-Huaihe River Basin. 2) In recent years, the precipitation in rainy season (summer) in North China and Northeast China is similar to that during 1961-1965, which is significantly high. However, the circulation pattern is significantly different from that during 1961-1965. For the sea-level pressure field in summer, the low-pressure center in Mongolia was located in South Central Mongolia during 1961-1965, with low pressure trough significantly dee-pened; while it was located in Eastern Mongolia and toward North China and Northeast China during 2011-2013, with low pressure trough significantly weakened. At 500 hPa height field, Siberia trough and North China trough were deepened but Baikal Lake Ridge was weakened during 1961-1965. Besides, the “step trough” brought more rainfall to North China and Northeast China. During 2011-2013, however, the Baikal Lake Ridge was normal, the geopotential height of Okhotsk Sea was increased, the subtropical high was located northward, and the blocking effect by the eastern part on the North China trough was strengthened, resulting in more rainfall during summer in North China and Northeast China. At 850 hPa wind field, southerly wind was obviously abnormal in East Asia and strong cyclonic circulation anomaly also occurred in Mongolian region during 1961-1965. Wind direction convergence was caused in the west of North China and Northeast China with the southerly airflow in East Asia, resulting in abnormally more rainfall in North China and Northeast China. During 2011-2013, however, south wind was normal in East Asia but southeast wind was obviously abnormal, with wind speed significantly lower than that of southerly wind during 1961-1965. Moreover, there was no dynamic condition created by cyclonic circulation convergence in Mongolian region. As a result, the rainfall in summer in North China and Northeast China is more than that under normal condition but less than that during 1961- 1965. Therefore, similar to the period of 1961-1965, the precipitation in North China and Northeast China has increased significantly in recent years, but the circulation characteristics are markedly different. A significant difference was that the southerly wind was abnormal during 1961- 1965 (namely the summer monsoon in East Asia was strong); while the southeast wind was abnormal during 2011-2013 (namely the summer monsoon in East Asia was not markedly strong).
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