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《Chinese Journal of Atmospheric Sciences》 2004-03
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A Comparison Study of Precipitable Water Simulated by NWP and GPS Observations

Yuan Zhaohong 1,2) , Ding Jincai 3) , and Chen Yonglin 3) 1) (Nanjing Institute of Meteorology, Nanjing 210044) 2) (Shanghai Meteorological Bureau, Shanghai 200030) 3) (Shanghai Weather Center, Shanghai 200030)  
Based on the GPS data at 4 sites of GPS networks in the Yangtze delta over the Meiyu period of 2002 ( June 18~July 11), precipitable water (PW) evaluated by MM5 24h simulation is compared with GPS observation to validate the ability of MM5 to simulate water vapor as depicted by PW The results show that PW features observed at GPS sites directly relate to the movement and position of the Meiyu band during Meiyu period The humidity error of MM5 reanalysis fields can be minimized by increasing the horizontal resolution of the model, but it has a little positive impact on PW prediction Although a 5%~10% relative bias is found from the beginning of simulation, MM5 has a ability in PW prediction over 1h~10h integration period with the PW prediction error increasing obviously after 20h integration It is also found that the bias of PW between GPS observations and radiosondes is small GPS data is comparable to radiosondes even if GPS site is 43 Km far from radiosonde site The quality of GPS data must be considered before the data is fed into NWP model because it may have systematic errors
【Fund】: 中国科学院知识创新工程重要方向项目KJCX2 SW T1 3资助
【CateGory Index】: P456.7
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