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投稿时间：2005-11-22 修订日期：2006-11-27
投稿时间：2005-11-22 修订日期：2006-11-27
中文摘要: 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。
Abstract:The general differences of the geopotential height, temperature and w
ind fields between the NCEP FNL and the T213L31 analysis datasets from May 11 t
o June 10,2005 are analyzed. The results indicate that the biases at lower laye
r of atmosphere are minimum and the maxima often appear in 3 key regions. By usi
ng a correlation analysis of biases of terrain height and geopotential height, t
he bias of terrain height over the Qinghai Tibetan Plateau is regarded as the m
ajor force to form the bias of geopotential height between two datasets. Besides
, the impacts of the biases on atmospheric circulation at middle and lower layer
s are compared and illustrated. The results indicate that the Southwest Vortex a
nd the heat source of the plateau in former dataset are stronger than that of th
e latter and the shear of wind speed is weak.
keywords: NCEP-FNL T213L31 bias terrain Qinghai Tibetan Plateau
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引用文本：
李长青,闫之辉,王瀛,郜凌云,2007.NCEP-FNL与T213L31同化资料对比 分析中的地形差异影响[J].气象,33(1):62-69.
Li Changqing,Yan Zhihui,Wang Ying,Gao Lingyun,2007.Comparison between NCEP-FNL Reanalysis Data and T213L31 Assimilation Data[J].Meteor Mon,33(1):62-69.
李长青,闫之辉,王瀛,郜凌云,2007.NCEP-FNL与T213L31同化资料对比 分析中的地形差异影响[J].气象,33(1):62-69.
Li Changqing,Yan Zhihui,Wang Ying,Gao Lingyun,2007.Comparison between NCEP-FNL Reanalysis Data and T213L31 Assimilation Data[J].Meteor Mon,33(1):62-69.