ERA与NCEP2大气热源的对比分析以及全球大气热源性质变化规律的研究  

Comparison of the Atmospheric Heat Sources Obtained from ERA and Those from NCEP2 and Study of the Variations in the Nature of Heating over the Global Atomosphere

作　　者：蓝光东[1] 温之平[1] 贺海晏[1] 

机构地区：[1]中山大学季风与环境研究中心大气科学系,广州510275

出　　处：《大气科学》2005年第1期154-163,共10页Chinese Journal of Atmospheric Sciences

基　　金：国家自然科学基金项目 40 2 750 2 6; 973项目G1 9980 4 0 90 0共同资助

摘　　要：首先 ,对比分析了ECMWF再分析资料 (简称ERA)和NCEP NCAR第 2版再分析资料 (简称NCEP2 )计算的大气热源 ,并在此基础上研究了全球大气热源性质 (符号 )变化的规律。分析两套资料计算的大气热源差别较大的某些地区 ,发现ERA资料在这些地区估算的大气热源要优于NCEP2 ,因此 ,在接下来的研究中主要采用了ERA资料。对全球大气热源性质 (符号 )变化规律的研究主要揭示了全球永久大气热源和永久大气热汇的地理分布特征。永久大气热源中心主要分布在赤道附近地区 ,在赤道非洲的西部、苏门答腊岛西边的海域和赤道中西太平洋地区各有一个较强的永久热源中心 ,另外 ,在日本南部及其东边的太平洋上也有一永久热源中心。永久热汇地区的分布比较有规律 ,除了南北半球 6 0度到两极之间为永久热汇地区外 ,南半球 5°S～ 4 0°S各大陆西边的大洋上都有一个永久热汇中心 ,另外 ,在阿拉伯海的北端 ,北半球 15°N～ 4 0°N之间太平洋和大西洋的东部也分别有一热汇中心。The global atmospheric heat sources are calculated by using the ECMWF reanalyzed data (hereafter referred to as ERA) and the NCEP/NCAR reanalyzed data (version 2, hereafter referred to as NCEP2) independently. Based on the comparisons of the atmospheric heat sources from ERA and those from NCEP 2, the annual oscillations of the sign of the vertically integrated heat source field 〈Q 1〉 are studied in this paper. It is showed that the variation of 〈Q 1〉 revealed by the ERA data in some regions where great differences between the two data sets are observed seems to be more realistic than that revealed by the NCEP 2 data set. So we carry on our next analysis in this paper based on the results from the ERA data set. By analyzing the annual oscillation of the sign in the vertically integrated heat source field 〈Q 1〉, geographical distributions of the permanent atmospheric heat sources (sinks) are presented. The permanent heat sources are located over i) the western part of the equatorial Africa; ii) the ocean region on the west side of the Sumatra; iii) the equatorial Western Pacific and the equatorial Central Pacific. In addition, there is also a permanent heating center over the ocean region to the east of Japan. The permanent heat sinks are mainly located over the high latitude regions, and over the tropical ocean regions to the west of the continents.

关 键 词：大气热源 NCEP 赤道 太平洋 ECMWF 大洋 南北半球 变化规律 分布 南部 

分 类 号：P425[天文地球—大气科学及气象学] P434