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Taiwan yushan Snowfall Activity and Its Association with Atmospheric Circulation from 1979 to 2009

Advances in Atmospheric Sciences 2011年第6期28卷 1423-1432页

作者：蔡梨敏刘广英王自发 Graduate University of the Chinese Academy of Sciences Institute of Atmospheric Physics Chinese Academy of Sciences Graduate Institute of Earth Sciences Chinese Culture University

yushan is the most famous location for snow in Taiwan Willie snowIali in the subtropical zone is rare. When it is snowing in yushan, people are experiencing unusually cold and wet weather elsewhere in Taiwan. In this study, yushan snowfall activity from 1979 to 2009 and the related atmosphere circulation were examined with the Taiwan Central Weather Bureau＇s yushan weather station observations and the National Centers for Environmental Prediction/Department of Energy （NCEP/DOE） reanalysis atmospheric data. To provide a quantitative measure of snowfall events, a snowfall activity index （SAI） was defined in this study. The time series of yearly SAIs shows that yushan snowfall activity for an active year, such as 1983 （SAI =39 153） was ~118 times larger than for an inactive year, such as 1999 （SAI=331）. Our analyses show that snowfall activity is closely related to the position of the East Asian Trough （EAT） and the strength of the West Pacific High （WPH）. In active years, when the EAT shifted eastward and the strength of WPH increased, an anomalous anticyclone occurred in the West Pacific. This anticyclone introduced anomalous southwesterly flows along the southeastern cost of China's Mainland and over Taiwan, resulting in a wetter-than-normal atmosphere that favored snowfall. Alternatively, in inactive years, a drierhan-normal atmosphere resulted in sluggish snowfall seasons.

关键词： yushan snowfall activity atmospheric circulation

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