GPS掩星折射率的一维变分同化

1 D VAR retrieval of refractivity by GPS occulation

为了探索GPS掩星观测资料在数值预报模式中的同化应用,利用GPS掩星折射率的一维变分同化技术,将MM 5模式输出结果作为背景场,以GPS掩星折射率作为观测值来进行一维变分同化。将同化反演后得到的气压、温度、水汽压廓线与德国地学研究中心(GFZ)公布的气象观测资料进行了对比和分析,得到了较好的比较效果。证实了GPS掩星资料的合理同化对数值预报可进行有效的改进,并提出了下一步的同化方向。

To seek the GPS occulation data assimilation in the numerical model, the GPS oeeulation 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 oceulation data can effectively improve numerical weather prediction model. Finally the next assimilation method was presented.