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1 D VAR retrieval of refractivity by GPS occulation

SHENG Zheng,FANG Hang-xian,LIU Lei,HUANG Si-xun(Institute of Meteorology,PLA Univ.of Sci.& Tech.,Nanjing 211101,China)  
To seek the GPS occulation data assimilation in the numerical model,the GPS occulation refractivity was assimilated with MM5 data as background field with one dimensional variational(1DVAR) retrieval technique.The retrieval pressure,temperature,water vapor profiles were compared with GFZ data,and a preferable contrast result was deduced.The assimilation of GPS occulation data can effectively improve numerical weather prediction model.Finally the next assimilation method was presented.
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