对“喜马拉雅山积雪与印度季风降水呈明显反相关关系”的商榷

COMMENTS ON“AN APPARENT RELATIONSHIP BETWEEN HIMALAYAN SNOW COVER AND SUMMER MONSOON RAINFALL OVER INDIA”

中文关键词:  亚洲高原积雪  印度季风降水  ENSO

英文关键词:Snow cover over the High Asia  Indian monsoon rainfall  ENSO

中文摘要:

      亚洲高原积雪百余年来一直为气候学家所瞩目。过去根据有限的积雪资料分析认为,喜马拉雅山积雪与印度夏季降水呈明显反相关关系。本文根据1957-1992年60个基本气象台站逐日雪深、密度记录,1978-1987年SMMR微波周积雪深度资料,以及1966-1989年NOAA周积雪面积资料所反映的高原积雪空间分布,季节变化,与年际波动特征,和高原积雪异常、印度季风降水异常、ENSO三者发生时间的对比分析以及相关计算,提出对前人研究结论的商榷。

英文摘要:

      The snow cover in central high Asia has been the focus of climatologists interests for many decades. Earlier studies indicate that Himalayan snow cover has a significant effect on Indian monsoon rainfall,but they have relied on very limited snow cover data. In this paper,three complete high Asian snow cover data sets are used. They consist of SMMR weekly snow depth charts covering the period 1978-1987,operational NOAA weekly snow cover extent during the period between 1966-1989,and daily snow depth records at 60 primary weather stations over the 36-year period 1957-1992. Unpervasive feature,dearth of snow mass in the interior,and limited portion affected by substantial interannual variability reveal that the high Asian snow cover itself could not greatly influence the Indian monsoon rainfall. A simple approach of lead/lag relation between high Asian snow cover,Indian monsoon rainfall,and ENSO shows that snow cover over the high Asia is not a key variable influencing the Indian monsoon. Further correlation calculation indicates that only a week signal was found.