NCEP-FNL与T213L31同化资料对比分析中的地形差异影响  

Comparison between NCEP-FNL Reanalysis Data and T213L31 Assimilation Data

作　　者：李长青[1] 闫之辉[2] 王瀛[3] 郜凌云[3] 

机构地区：[1]南京大学大气科学系 [2]国家气象中心 [3]辽宁省气象台

出　　处：《气象》2007年第1期62-69,共8页Meteorological Monthly

摘　　要：分析了2005年5月11日至6月10日的NCEP-FNL与T213L31分析资料在位势高度、温度和风场上的整体差异,揭示了低层差异最小,差异极值主要分布在3个关键区的特征。进一步通过地形高度差异与位势高度差异的相关性分析,认为青藏高原附近的地形高度差异的极值是引起两种资料位势高度差异的主要原因,并计算分析了这种差异对高原周围中低层大气环流的动力和热力影响。结果显示,在NCEP-FNL中的西南涡强度和热源作用较强,中层风速切变较弱。The general differences of the geopotential height, temperature and wind fields between the NCEP-FNL and the T213L31 analysis datasets from May 11 to June 10,2005 are analyzed. The results indicate that the biases at lower layer of atmosphere are minimum and the maxima often appear in 3 key regions. By using a correlation analysis of biases of terrain height and geopotential height, the bias of terrain height over the Qinghai-Tibetan Plateau is regarded as the major force to form the bias of geopotential height between two datasets. Besides, the impacts of the biases on atmospheric circulation at middle and lower layers are compared and illustrated. The results indicate that the Southwest Vortex and the heat source of the plateau in former dataset are stronger than that of the latter and the shear of wind speed is weak.

关 键 词：NCEP—FNL T213L31 差异 地形 青藏高原 

分 类 号：P468[天文地球—大气科学及气象学]