关键词: 晋北地区, 春季降水, 大气环流异常, 合成分析, 海温

Abstract: Based on NCEP reanalysis data,the ICOADS SST grid data and the observed data of spring precipitation from 18 meteorological stations in Northern Shanxi during 1960-2008,the air sea factor that caused abnormal spring precipitation in Northern Shanxi was investigated by using composite analysis method.The results showed that the 500hPa geopotential height had the distribution characteristics with "high in the east and low in the west" in the spring of rainy years in Northern Shanxi.From the east of the Ural Mountains to the West of Lake Baikal,trough was strengthened and Northern Shanxi was in the southeast of the trough.The intersect of the cold air from Northwest and the warm air from Southeast in North area always resulted in the rainy weather in spring.Contrarily, the cold and warm was less competitive in drought year,and the auxiliary area located in the central part of Mongolia,which was not conducive to the production of spring precipitation in Northern Shanxi.The analysis on the correlation of spring precipitation and abnormal air sea presented there had more precipitation when the ENSO was in warm phase,and there had less precipitation when the ENSO was in cold phase in the spring of Northern Shanxi.The results were help to understand the origin of abnormal drought and flood in Northern Shanxi and provided a theoretical basis for short term climate forecast.

Key words: Northern Shanxi, Spring precipitation, General circulation anomaly, Composite analysis, Sea surface temperature