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大气科学  2005 

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

DOI: 10.3878/j.issn.1006-9895.2005.01.18

Keywords: 大气热源ERA与NCEP的对比分析永久大气热源(汇)

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Abstract:

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60度到两极之间为永久热汇地区外,南半球5°S~40°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~40°N之间太平洋和大西洋的东部也分别有一热汇中心.

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