Title: Relationship between the Intraseasonal Oscillation of East Asian Monsoon Circulation and the Heavy Snow over Southern China in Boreal Winter of 2007/2008
Abstract: An extreme low temperature and heavy snow(rain) occurred in southern China during 10 January-2 February 2008.The intraseasonal oscillation characteristics of wind at 850 hPa and association with the extreme anomalous weather in southern China were studied by wavelet analysis and the LANCZOS filter based on the NCEP/NCAR daily reanalysis datasets.The oscillation period with 20 to 50 days was significant for the wind over southern China at 850 hPa during December 2007-February 2008.The extreme low temperature and heavy rain/snow occurred in southern China was related to the anomalous cyclonic circulation or convergence zones over southern China which formed by vector wind at 850 hPa.During 2-21 January 2008,there were anomalous cyclonic circulation over southern China formed by anomalous northerly wind along(20~30°N,100°E) and anomalous southerly wind from the lower latitude in East Asia.In the first stage,the anomalous southerly wind looked stronger than northerly wind and adversed in the second stage,so the heavy snow(rain) was associated with lower temperature.During 22 January-14 February 2008 the convergence zone over 25°N formed between anomalous southerly wind from the lower latitude and northerly wind from mid-high latitude in East Asia.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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