青藏高原前期冬春季地面热源与我国夏季降水关系的初步分析  被引量:20

The Preliminary Analysis of the Relationships between the Surface Heat Source over the Tibetan Plateau in Winter and Spring and the Summer Rainfall over China

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作  者:刘晓冉[1] 李国平[2] 程炳岩[1] 

机构地区:[1]重庆市气候中心,重庆401147 [2]成都信息工程学院大气科学系,成都610225

出  处:《大气科学》2008年第3期561-571,共11页Chinese Journal of Atmospheric Sciences

基  金:国家重点基础研究发展规划项目2004CB418302

摘  要:首先对青藏高原地表热通量再分析资料与自动气象站(AWS)实测资料进行对比,结果表明:相对于美国国家环境预报中心和国家大气中心20世纪90年代研制的NCEP/NCAR(Kalnay等1996)和NCEP/DOE(Ka-namitsu等2002)再分析资料,ECMWF(Uppala等2004)资料在高原地区的地表热通量具有较好的代表性。进一步利用奇异值分解(SVD)方法分析了ECMWF资料反映的高原地面热源与我国夏季降水的关系,发现前期青藏高原主体的冬季地面热源与长江中下游地区夏季降水量呈负相关,与华北和东南沿海地区的夏季降水量呈正相关。而长江中下游地区夏季降水量还与春季高原南部的地面热源存在负相关、与高原北部的地面热源存在正相关。高原冬、春季地面热源场的变化是影响我国夏季降水的重要因子。It is well known that the thermal effects of the Tibetan Plateau play an import role in the general circulation of atmosphere and climate in East Asian, even in the global world. The reanalysis data can server as a beneficial supplement to research the thermal effects of the Tibetan Plateau. There are few researches on the relationships between the summer rainfall over China and the surface heat source over the Tibetan Plateau through the use of the surface heat fluxes of reanalysis data. However, there is a doubt about the reliability of the surface heat fluxes of the reanalysis data over the Tibetan Plateau. Therefore, the surface fluxes of sensible heat and latent heat for the three sets of reanalysis data of NCEP/NCAR (NCEP1), NCEP/DOE (NCEP2), and ECMWF (ERA) are compared with those of Automatic Weather Station (AWS) data over the Tibetan Plateau under the China-Japan cooperation research project on the Asian monsoon mechanism and the Global Energy and Water Balance Experiment-Ti- betan Monsoon Experiment (GAME/Tibet) . The results show that the variation trends of both daily and monthly surface heat fluxes of reanalysis data are basically in accordance with those of AWS data. The surface heat fluxes of ERA data have better representations compared to those of NCEP1 data and NCEP2 data, especially for the sensible heat flux in western Tibetan Plateau. The sensible heat flux of ERA data can also show the interannual change of the sensible heat flux of AWS data. On the basis of the above, the relationships between surface heat source over the Tibetan Plateau with ERA data and the summer rainfall in China are investigated with singular value decomposition (SVD) method. It is found that the previous surface heat source over the plateau region in winter is negatively correlated with the summer rainfall over the mid-lower reaches of the Yangtze River, and positively correlated with rainfall in North China and the coast of southeastern China. And the summer rainfall in the mid-lower reaches

关 键 词:青藏高原 地面热源 自动气象站 夏季降水 奇异值分解 

分 类 号:P426[天文地球—大气科学及气象学]

 

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