用中国地区ERA-Interim资料计算ZTD和ZWD的精度分析

STUDY ON ACCURACY OF ZTD AND ZWD CALCULATED FROM ERA-INTERIM DATA OVER CHINA

对欧洲中尺度气象预报中心(ECMWF)提供的ERA-Interim资料在中国地区的可行性和精度进行了评估分析,探讨了ERA-Interim资料计算对流层天顶总延迟(ZTD)和湿延迟(ZWD)的处理方法,并和全国28个GPS台站实测值计算的ZTD和ZWD进行比较。结果显示ECMWF资料计算ZTD的总体平均偏差和中误差分别约为-1cm和2 cm,ZWD在BJFS和LHAS站的偏差和中误差绝对值分别约为1 cm和1.6 cm。

The zenith tropospheric delay （ZTD） and zenith wet delay （ZWD） derived from the European Cen- ter for Medium-Range Weather Forecasts data （ECMWF ZTD/ZWD） were assessed by calculating ZTD/ZWD from GPS observations, and the calculation method was also discussed. The results show that the bias and rms for the ECMWF ZTD are about - 1 cm and 2 cm respectively, the absolute values of which for ECMWF ZWD at BJFS and LHAS sites are 1 cm and 1.6 cm respectively.