太平洋海温对冬季阿留申低压的影响

THE EFFECTS OF SEA TEMPERATURE IN PACIFIC ON ALEUTIAN LOW IN WINTER

众多的研究表明,海温异常对大气环流具有一定的影响作用。鉴于阿留申低压与我国乃至东亚地区天气气候的密切关系,本文重点分析了太平洋海温对冬季阿留申低压的影响问题,对阿留申低压与500 hPa环流的联系在此也作了简单的讨论。为便于本文之研究,根据1951—1986年冬季各月海平面气压场资料,定义了冬季阿留申低压强度指数。在月平均海平面气压图上,60°N以南的太平洋区域,对1010 hPa范围内的每个网格点,取1009 hPa为1,1008 hPa为2,1007 hPa为3……余类推,用其累加值作为月阿留申低压强度指数。冬季强度指数为12月至翌年2月各月强度指数和的平均。

In this paper, the effects of sea temperature in Pacific on Aleutian Low in winter are analysed. It is found that there is a close correlation between Aleutian Low in winter and the sea surface temperature in the regions of (40-50°N, 160°E-175°W) and (5°-10°S, 145°-120°W) East Pacific in Autumn. It is also found that El Nino event could affect the variation of intensity of Aleutian Low in some degree. In addition, the periodic variation of Aleutian Low and its relationship with 500hPa circulation are also discussed.