肖弘毅,韩威,白一泓. 2022. GCOM-W AMSR2资料在CMA_GFS 4DVar中的同化应用[J]. 气象学报, (0):-, doi:[doi]
GCOM-W AMSR2资料在CMA_GFS 4DVar中的同化应用
Assimilation of GCOM-W AMSR2 radiance data in CMA_GFS 4DVar
投稿时间:2022-03-09  修订日期:2022-06-02
DOI:
中文关键词:  GCOM-W,AMSR2,CMA_GFS,四维变分同化,卫星资料同化
英文关键词:GCOM-W,AMSR2,CMA_GFS,4D-Var,Satellite data assimilation
基金项目:第二次青藏高原综合科学考察研究项目(2019QZKK0105)、国家自然科学基金项目(42075155)
作者单位邮编
肖弘毅 1. 中国气象局地球系统数值预报中心北京100081 2. 灾害天气国家重点实验室北京100081 100081
韩威 1. 中国气象局地球系统数值预报中心北京100081 2. 灾害天气国家重点实验室北京100081 100081
白一泓 3. 中国气象局国家卫星气象中心中国遥感卫星辐射测量和定标重点开放实验室北京100081 4. 许健民气象卫星创新中心北京100081 100081
摘要点击次数: 25
全文下载次数: 18
中文摘要:
      卫星微波仪器的辐射率资料,由于兼具卫星观测的全天空优势和微波观测的全天候特性,在数值天气预报系统的同化中占据日益重要的角色。针对全球水循环变动观测卫星GCOM-W上搭载的第二代先进微波扫描辐射计AMSR2的10个通道,建立了半径200km的稀疏化方案,包含9项检验的质量控制方案,基于经典预报因子的偏差订正方案,以及基于变分同化后验估计的观测误差方案。通过以上方法,GCOM-W AMSR2共有10个通道辐射率资料,在我国自主研发的全球/区域同化预报系统(CMA_GFS,前身即GRAPES_GFS)3.0版本的四维变分同化系统(4DVar)中实现了直接同化应用。一个月的批量试验证明,同化GCOM-W AMSR2后,CMA_GFS湿度分析场精度得到了一定的改进,各量级定量降水中期预报评分有所提高,同时,GCOM-W AMSR2辐射率直接同化,对CMA_GFS南半球和赤道地区预报有正贡献。
英文摘要:
      The radiance data of satellite microwave radiometers takes more and more important roles in assimilation of numeric prediction systems, due to the all-sky advantage of satellite observations and the all-weather availability of microwave sounding. Focusing on the Advanced Microwave Scanning Radiometer 2 (AMSR2) carried on the Global Change Observation Mission – Water (GCOM-W), thinning scheme within 200 km radius, quality control scheme including nine issues of checks, bias correction scheme on basis of conventional predictors, and observation errors scheme on basis of posteriori verification are developed. Ten channels of GCOM-W AMSR2 are directly assimilated into the Global/Regional Assimilation and Prediction System – Global Forecast System (CMA_GFS, i.e., the GRAPES_GFS) version 3.0 by four-dimensional variational (4DVar), which is researched and developed by the Numerical Weather Prediction Center of China Meteorological Administrator independently. A pair of batch experiments for one month indicates that, after GCOM-W AMSR2 assimilation, the depiction of humidity analysis field is improved, the medium forecasting skills of various precipitation is also promoted, and the prediction score card shows obvious positive impacts on southern hemisphere and tropical region. Thus, the directly assimilation of sGCOM-W AMSR2 in CMA_GFS 4DVar is confirmed to be feasible and beneficial.
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