近50年阿留申低压地区凝结加热的变化  

Variation of the Condensation Heating in the Region of the Aleutian Low during the Last 50 Years

作　　者：钱诚[1] 符淙斌[2] 

机构地区：[1]中国科学院大气物理研究所东亚区域气候-环境重点实验室 [2]中国科学院大气物理研究所东亚区域气候-环境重点实验室北京100029

出　　处：《气候与环境研究》2006年第3期340-346,共7页Climatic and Environmental Research

基　　金：中国科学院知识创新工程重要方向项目KZCX3-SW-218;国家重点基础研究发展规划项目2006CB400504

摘　　要：利用1948-2003年NCEP再分析凝结加热率资料，研究了北太平洋地区整层凝结加热的季节演变，着重研究了阿留申低压地区（30-50°N，160-210°E）凝结加热的长期变化，探讨了它对北太平洋年代际变率可能的反馈。研究表明：冬季阿留申低压地区上空存在较强的凝结加热，它与阿留申低压的强度存在显著的正相关关系；该处凝结加热的垂直分布不均匀可引起大气环流热力适应，从而可能有利于阿留申低压的加强；该处凝结加热在20世纪70年代末发生了一次明显的阶段性转折，70年代末以后增强，它可能对阿留申低压的强度形成反馈，从而有利于阿留申低压在70年代末以后加强。作者进一步讨论了该处凝结加热发生这种阶段性转折的原因和传播机制。long-term NCEP-NCAR reanalysis condensation heating data were used to investigate its geographic pattem in the northem Pacific, especially its long-term variation in the region of the Aleutian low. Feedback effects of the condensation heating in this region on interdecadal variability of the North Pacific ocean-atmosphere system are explored. The results show that there is strong condensation heating in the region of the Aleutian low only in winter, and there is a significantly positive correlation between this condensation heating and the intensity of the Aleutian low; The vertical structure of heating in this region will lead to the atmospheric adaptation to diabatic heating, which may be in favor of the intensification of the Aleutian lowt There was an obvious regime shift to stronger condensation heating in this region in the late 1970s, which may be in favor of the intensification of the Aleutian low in the same period. We further discussed possible cause of the regime shift of condensation heating and its propagation mechanism.

关 键 词：凝结加热 年代际变化 阿留申低压 

分 类 号：P443[天文地球—大气科学及气象学]