摘要
采用 1 979～ 1 995年 (缺 1 986、1 987、1 993) NCEP/NCAR再分析资料中的逐旬感热通量资料 ,对亚洲季风区地面感热通量的空间结构及时间演变进行了旋转经验正交函数 ( REOF)分析。结果表明 :印度半岛和中南半岛地区感热通量的变化与亚洲季风的爆发及演变有密切关系 ,是季风爆发的主要关键区。这两个地区的感热积累是东亚季风爆发的触发因素之一 ,尤其是印度半岛北部感热通量的突变对印度夏季风演变十分重要。印度半岛北部与青藏高原西部的热力差异在季风的爆发和维持中占有重要地位。而东北亚与西北太平洋的热力差异只对东亚夏季风的演变有影响 ,与冬季风则无直接关联。在东亚季风的爆发中居主导地位的还是印度半岛北部和青藏高原西北部的感热加热作用。
By the use of NCEP/NCAR reanalysis dekad sensible heat flux (SHF) dataset from 1979 to1995,the spatial and temporal distribution of SHF over the Asian monsoon region is investigated based on the Rotated Empirical Orthogonal Function(REOF).Results show that the variations of SHF in the Indian Peninsula and the Indochina Peninsula have strong connections to the onset and evolution of Asian monsoon, and these are probably the leading key regions for the monsoon onset. According to the seasonal variation of time coefficient, the accumulations of SHF over the Indian Peninsula and the Indochina Peninsula are probably one of the triggers of east Asian monsoon onset. Moreover, the sudden change of SHF over north of the Indian Peninsula during summer monsoon period probably plays an important role in the evolution of the Indian summer monsoon. In addition, the difference of SHF between the north of the Indian Peninsula and west of the Tibetan Plateau plays an important role in the onset and maintenance of Indian monsoon. However, the difference of SHF between Northeast Asia and Northwest Pacific has influence on the evolution of east Asian summer monsoon only but has no direct connection to winter monsoon. Above all, the forcing of SHF in the north of the Indian Peninsula and the northwest of the Tibetan Plateau plays a leading role in the onset of east Asian monsoon.
出处
《南京气象学院学报》
CSCD
北大核心
2001年第3期398-404,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 (1 9980 40 90 0 )"我国重大气候灾害的形成机理和预测理论研究"
国家自然科学基金重点项目"中国区域气候变化分析和机理研究"4973 5 1 70
关键词
旋转经验正交函数
东亚季风
地面感热通量
季风爆发
亚洲季风区
rotated empirical orthogonal function
east Asian monsoon
sensible heat flux
key regions of monsoon onset
