ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 36 Issue 10 > 2010,36(10):14-20. DOI:10.7519/j.issn.1000-0526.2010.10.003 Prev Next
Analysis on Influence Factors of the Abnormal Low Temperature, Sleet and Frost Weather in Guangxi at the Beginning of 2008
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Abstract:
During January 12 to February 20 of 2008, the low temperature, sleet and frost weather process occurred in Guangxi, whose duration has been the longest and the average temperature has been the lowest since 1951, and the accumulative temperature of the process reached the standard level of abnormal low. Circulation features and indices of six remarkable low temperature and sleet processes at the corresponding period in Guangxi were analyzed, then EMD (empirical mode decomposition) research was carried out for four kinds of circulation indices which are obviously correlated, results showed that major circulation characteristics of abnormal low temperature of Guangxi are of dipole type at 500 hPa circulation in the Northern Hemisphere, therefore, there are stable high ridges over high and midlatitudes of Asia and North Pacific, and it also has the stable trough over the QinghaiTibetan Plateau and the Bay of Bengal at the same time. These are the major circulations for abnormal low temperature weather in Guangxi. The stronger trough over Mongolia and the Bay of Bengal, the stronger blockinghigh, and more days for the westward extension of the subtropicalhigh ridge from the South China Sea to Philippines, all these are the main influence factors for the low temperature, sleet and frost weather process, so that the low temperature, sleet and frost synoptic process happened in Guangxi at the beginning of 2008 when these conditions are satisfied.
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