关键词: 雨凇, 阻高, 副高, 南支槽, 逆温

Abstract:

Two rare snow storm weather processes occurred in January 2008 and January 2011 in Guizhou Province，in this paper，the actual status，possible causes and their influence of these two freezing weather processes were analyzed． Results show that in 2008，the impact of La Nina events，the abnormal development of Eurasian blocking high in Jannuary，sustained and stable atmospheric circulation， active low system over central and west Asia，continuously northward transportation of plentiful warm and moist air from the bay of Bengal and South China Sea ( India － Burma trough) ，further north position of the ridge line，the larger area and stronger intensity of Western Pacific subtropical，all these were main causes resulting in freezing disaster weather in January 2008 in Guizhou． The impact of La Nina events，the abnormal development of Eurasian blocking high sustained and stable atmospheric circulation，continuously northward transportation of plentiful warm and moist air from the bay of Bengal and South China Sea ( India － Burma trough) were still important causes of the disaster weather process in Jannuary of 2011 in Guizhou，but the subtropical high was weaker，the low system over central and west Asia was not so active，so the intensity and range were less than those in January 2008．

Key words: freezing weather, blocking high, subtropical high, southern branch trough, inversion