摘要
利用高原测站的月平均雪深资料和NCEP/NCAR再分析资料,分析了20世纪70年代末以来,青藏高原积雪的显著增多与亚洲季风环流转变的联系。研究表明,高原南侧冬春季西风的增强及西风扰动的活跃是造成青藏高原冬春积雪显著增多的主要原因,高原积雪的增多与亚洲夏季风的减弱均是亚洲季风环流转变的结果;20世纪70年代末以来,夏季华东降水的增多、华南降水的减少及华北的干旱化与青藏高原冬春积雪增多及东亚夏季风的减弱是基本同步的,高原冬春积雪与华东夏季降水的正相关、与华北及华南夏季降水的负相关主要是建立在年代际时间尺度上,因此,高原积雪与我国夏季降水关系的研究应以亚洲季风环流的年代际变化为背景。
Based on the monthly mean snow depth observations over the Tibetan Plateau and the NCEP/NCAR reanalysis data,the relation between the obvious increasing of the Plateau snow cover and the transition of Asian monsoon circulation since the end of 1970s is analyzed.The results indicate that the increasing of winter or spring snow mass over the Plateau is mainly due to the enhance of the westerly south of the Plateau and the active westerly disturbances in winter and spring.The increasing of snow cover and the weakening of Asian summer monsoon both result from the transition of Asian monsoon circulation.Since the end of 1970s,the increasing of summer rainfall over East China and the decreasing of summer rainfall over South and North China are synchronous with the increasing of snow mass over the Plateau and the weakening of East Asian summer monsoon.The previous winter and spring snow cover over the Plateau positively correlated with the summer rainfall over East China and negatively correlated with the summer rainfall over South and North China on interdecadal time scale.Therefore,the researches about the relation between the Plateau snow cover and the summer rainfall over China should be set under the background of the interdecadal variation of Asian monsoon circulation.
出处
《南京气象学院学报》
CSCD
北大核心
2003年第6期733-739,共7页
Journal of Nanjing Institute of Meteorology
基金
国家重点基础研究发展规划项目(G1998040901-03)
南京气象学院气象灾害和环境变化重点开放实验室开放课题项目(K2107)
关键词
青藏高原积雪
亚洲季风环流
年代际变化
气候
snow cover over the Tibetan Plateau
Asian monsoon
interdecadal variation
