几种再分析地表气温资料在中国区域的适用性评估  

Applicability Evaluation of Surface Air Temperature from Several Reanalysis Datasets in China

作　　者：赵天保[1] 符淙斌[1] 

机构地区：[1]中国科学院大气物理研究所东亚气候-环境重点实验室,北京100029

出　　处：《高原气象》2009年第3期594-606,共13页Plateau Meteorology

基　　金：国家973项目(2009CB723904);国家自然科学基金项目(40805032);中国科学院知识创新工程项目(IAP07405)共同资助

摘　　要：应用台站观测资料对ERA-40、NCEP/NCAR、NCEP/DOE和JRA-25等几种再分析地表(2m)气温资料在中国不同区域、不同年代和季节的气候均值、年际变化和变率特征及其气候趋势等所反映出来的适用性问题进行了系统评估。结果表明,几种再分析产品在全国大多数地区的气候变化研究中都具有一定的合理性,特别是1979年以后的资料可靠性更高一些。但相比而言,它们在冬季的可信度一般要高于夏季,东部地区的可信度一般要高于西部地区;ERA-40和JRA-25再分析产品的适用性要高于NCEP/NCAR和NCEP/DOE再分析产品;其中,JRA-25在均值、年际变化和变率特征的描述上具有更高的可靠性,而ERA-40在长期气候变化趋势(44年)的描述上则要明显优于NCEP/NCAR再分析产品。Applicability of 2 m temperature from the ERA-40, NCEP/NCAR, NCEP/DOE and JRA- 25 reanalysis are evaluated according to climate mean, interannual variation and variability, and climate trends, respectively in different regions, different periods and seasons using the station observations in China. The results indicate that these reanalyzed products all can be employed to study the climate change in most of regions of China to a certain extent, but they display a better applicability after 1979. The quality displayed by them is usually is better in winter than in summer, and more reliable in east area of China than in west area. The ERA-40 and the JRA-25 reanalyzed products comparatively show better applicability than the NCEP/NCAR and the NCEP/DOE counterparts. The JRA-25 can better to represent the observed climate mean, interannual variation and variability than other reanalyzed products, but the ERA- 40 is more superior to the NCEP/NCAR to represent the long-term trends of climate change.

关 键 词：中国区域 地表气温 再分析资料 观测资料 适用性评估 

分 类 号：P423.3[天文地球—大气科学及气象学]