东亚大气热源的气候学特征分析

Climatic Characteristics of Atmospheric Heat Sources / Sinks over the East Asian Region

利用1948~2008年共61年NCEP/NCAR再分析资料对全球的大气热源（汇）统计处理,采用经验正交函数分解方法、气候态平均分析方法,分析了东亚地区的大气热源、热汇的基本气候特征,对61年来东亚地区大气热源热汇各月,各季节的气候态分析,并从全球的大气热源、热汇剖面分析中了解了其变化规律。揭示了全球大范围的大气热源区主要分布在南亚—热带印度洋—热带太平洋的中部和西部两侧、南美洲的赤道及其南侧地区一带,并得出其变化的平均趋势;0~60°N,每10个纬度带内热源、热汇的年变化不仅与全球纬向平均的热源、热汇年变化有非常大的差异,而且亚洲,青藏高原、东亚大陆、西太平洋地区6个平均纬度带之间的差异也非常明显。

The global atmospheric heating sources/ sinks 〈 Q1 〉 are calculated from the NCEP/NCAR reanalysis data for 61 a from 1948 to 2008 by the thermodynamic equation, and the basic climatic characteristics and annual variations of 〈 Q1 〉 in the East Asian region are examined. The results are as follows ： （ 1 ） The average season, month, and annual variations of the East Asia region, from the graphs we can see The 〈 Q1 〉 in the East Asian monsoon region varies greatly from season to season. （2） the average monthly time - longitude profile in change pictures are drawn. The annual variations of 〈 Q1 〉 are remarkably different in the six Latitude zones of Tibetan Plateau, the EastAsian continent and western Pacific, and have a descriptive analysis of the graphs.