2012年FNL气温、气压和地面温度资料与河南省实况观测要素的误差对比分析

Error Comparison Analysis Between FNL Data and Observation Data of Air Temperature,Air Pressure and Ground Temperature in Henan Province in 2012

为了进行河南省区域范围内FNL资料的可信度检验，利用2012年NCEP／NCAR的FNL分析资料和河南省121个地面气象观测站的气温、气压以及地面温度资料，通过Cressman插值方法，分别从00、06、12、18等4个时次、12个月份和全年平均等方面，系统地对比了分析资料值与观测值之间的误差。分析结果表明，2012年河南省FNL资料气温、气压及地面温度的误差值（FNL分析值一实测值）区域分布特征比较接近，即存在着由西部、西北部山区的误差值负值区向东部误差值正值区的渐变趋势。对比表明，河南省大部分地区气温的误差在-3～2K之间；气压的误差多在-10～10hPa之间；而地面温度的平均误差主要在-5—2K之间。FNL资料气温比地面温度的模拟结果更为准确，气温和气压资料都能够较好地代表实况。

Based on the NCEP INCAR final operational global analysis （FNL） data, the air temperature, air pressure and ground temperature data of 121 surface meteorological observing stations in Henan province in 2012 in terms of 4 times everyday, 12 months and year, the error comparison analysis between FNL data and observation data was carried by using Cressman interpolation method in order to test the reliability of these FNL data. The results showed that the error regional distribution characteristics of air temperature, air pressure and ground temperature data was similar. There was a gradual trend from negative territory （FNL data 〈 observations） in mountains of north-west and western to positive territory （FNL data〉 observations） in the east. The air temperature errors were in range of - 3 - 2 K in most areas of Henan province, air pressure errors were in range of - 10 - 10 hPa, and the average errors of ground temperature were mainly in - 5 - 2 K. FNL data of air temperature was closer to the observation data than ground temperature, FNL data of air temperature and air pressure data are better able to represent the current situation.