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大气科学  2009 

应用探空观测资料评估几类再分析资料在中国区域的适用性

DOI: 10.3878/j.issn.1006-9895.2009.03.19

Keywords: 再分析资料,高空观测资料,适用性评估,比较与分析

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Abstract:

通过与中国8个不同区域温度场和高度场的探空观测资料相比较发现,ERA-40、NCEP/NCAR和NCEP/DOE等再分析资料所描述的温度场和高度场产品的平均值以及年际变化特征等与观测结果的差异均在夏季比较明显,尤其1970年代以前在中国的西部和西南部地区的差别较为显著。其中,温度场的差别主要存在于对流层上层;高度场的绝对偏差也主要出现在对流层上层,而它们在年际变化特征及其长期变化趋势上的差别则反映在对流层中、下层,特别是NCEP/NCAR对流层中、下层的夏季高度场在1970年代以前存在着过于明显的“低压”现象,从而夸大了很多地区的年代际气候变化特征。就大多数地区而言,ERA-40在中国区域气候变化研究中具有相对较好的适用性,特别是在年代际气候变化研究中要明显好于NCEP/NCAR。研究还表明,NCEP/DOE与NCEP/NCAR在大多数地区除了在均值上有所不同外,它们的年际变化特征则并无显著差别。

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