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GPS无线电掩星资料的良好特性使其作为十分重要的观测资料在欧洲 及美国数值天气预报中效果明显. 本文设计了一维弯曲角算子在四维变分资料同化系统中的实现方法和质量控制策略. 详细阐述了一维弯曲角正演算子及其切线性/伴随算子在全球四维变分资料同化系统中的实现步骤和过程, 其中折射率计算中采用Reger的折射率最佳平均因子的三项表达式, 计算出更加精确的折射率值. 对2012年8月份的GPS无线电掩星资料进行了观测误差统计, 引入了更加符合四维变分资料同化系统实际情况的一维弯曲角观测误差模型和质量控制策略. 同时, 对比了观测误差统计试验中同化GPS无线电掩星资料的模式背景场和未同化GPS无线电掩星资料的背景场的观测误差统计结果, 发现同化GPS无线电掩星资料之后的观测误差统计结果在全球区域正作用十分明显, 尤其是在中低纬度地区, 高度在10 km 以上的区域观测误差减小十分明显.GPS radio occultation data are implemented in the numerical weather prediction as a kind of very important observation data because of its excellent characteristics, which makes a remarkable positive effect in the system. In this article, we design an implement method and a quality control strategy of one-dimensional bending angle operator in four-dimensional variational data assimilation system, and we also describe the steps of implementing one-dimensional bending angle forward operator and its linear and adjoint operators in four-dimensional variational data assimilation system. The author chose Reger’s three term expression and its best average coefficients are chosen to calculate refractivity values. In this article, we introduce an observation error model of one-dimensional bending angle operator through the statistics of GPS radio occultation observation data of August, 2012. A comparison of experiment of the analysis field between in the cases with and without GPS radio occultation data is made. It is concluded that GPS radio occultation data plays a positive role in the global areas, especially in the low and middle latitude areas higher than 10 km. This conclusion is the foundation of the following-up GPS radio occultation data assimilation verification experiments.
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Keywords:
- GPS radio occultation /
- one-dimensional bending angle operator /
- four-dimensional variational data assimilation system /
- quality control
[1] Cardinali C, Daescu D, Healy S, Dahoui M, Radnoti G, Fouilloux A 2011 ECMWF Seminar
[2] Marbouty D, Healy S 2011 ICGPSRO
[3] Healy S B, Thepaut J N 2006 Q. J. R. Meteor. Soc. 132 605
[4] Cucurull L 2012 J. Geophys. Res. (Submitted)
[5] Zhang W M, Cao X Q, Song J Q 2012 Acta Phys. Sin. 61 249202 (in Chinese) [张卫民, 曹小群, 宋君强 2012 61 249202]
[6] Cao X Q, Zhang W M, Song J Q 2012 Acta Phys. Sin. 61 020507 (in Chinese) [曹小群, 张卫民, 宋君强 2012 61 020507]
[7] Zhang W M 2006 Ph. D. Dissertation (Changsha: National University of Defense Technology) (in Chinese) [张卫民 2006 博士学位论文 (长沙: 国防科学技术大学)]
[8] Healy S 2009 GRAS SAF Report 09
[9] Smith E K, Weintraub S 1953 Proc. IRE 41 1035
[10] Reger J M 2002 Unisurv Rep. S-68 (Sydney: University of New South Wales)
[11] Fjeldbo G, Eshlemann V R 1968 Planet Space Sci. 16 1035
[12] Desroziers G, Berre L, Chapnik B, Poli P 2005 Q. J. R. Meteorol. Soc. 131 3385
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[1] Cardinali C, Daescu D, Healy S, Dahoui M, Radnoti G, Fouilloux A 2011 ECMWF Seminar
[2] Marbouty D, Healy S 2011 ICGPSRO
[3] Healy S B, Thepaut J N 2006 Q. J. R. Meteor. Soc. 132 605
[4] Cucurull L 2012 J. Geophys. Res. (Submitted)
[5] Zhang W M, Cao X Q, Song J Q 2012 Acta Phys. Sin. 61 249202 (in Chinese) [张卫民, 曹小群, 宋君强 2012 61 249202]
[6] Cao X Q, Zhang W M, Song J Q 2012 Acta Phys. Sin. 61 020507 (in Chinese) [曹小群, 张卫民, 宋君强 2012 61 020507]
[7] Zhang W M 2006 Ph. D. Dissertation (Changsha: National University of Defense Technology) (in Chinese) [张卫民 2006 博士学位论文 (长沙: 国防科学技术大学)]
[8] Healy S 2009 GRAS SAF Report 09
[9] Smith E K, Weintraub S 1953 Proc. IRE 41 1035
[10] Reger J M 2002 Unisurv Rep. S-68 (Sydney: University of New South Wales)
[11] Fjeldbo G, Eshlemann V R 1968 Planet Space Sci. 16 1035
[12] Desroziers G, Berre L, Chapnik B, Poli P 2005 Q. J. R. Meteorol. Soc. 131 3385
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