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CN 11-1768/O4

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FY-4A AGRI辐射率资料偏差特征分析及订正试验
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南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心

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国家自然科学基金,国家重点基础研究发展计划,高校基金,省自然科学基金,其它


Analysis of FY-4A AGRI bias characteristics and correction experiment
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Key Laboratory of Meteorological Disaster of Ministry of Education KLME/Joint International Research Laboratory of Climate and Environment Change ILCEC/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters CIC-FEMD,Nanjing University of Information Science and Technology

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    摘要:

    风云四号A星(Fengyun-4A,简称FY-4A)作为我国最新一代静止气象卫星,各方面技术指标都体现了“高、精、尖”特色,处于国际领先地位。其上搭载的多通道扫描成像辐射计(Advanced Geosynchronous Radiation Imager,简称AGRI)较上一代静止卫星风云二号的可见光红外自旋扫描辐射仪观测精度更高,扫描时间更短,充分体现AGRI观测资料将有效提高“一带一路”沿线国家和地区的天气预报和灾害预警水平。偏差订正是卫星资料处理的重要环节之一,因此本文通过在WRFDA v3.9.1(Weather Research and Forecasting model’s Data Assimilation v3.9.1)搭建AGRI同化接口,利用辐射传输模式RTTOV v11. 3和GFS全球预报系统(Global Forecast System)分析场研究了FY-4A AGRI红外通道8-14晴空辐射率资料的偏差特征并进行偏差订正对比试验,分析了卫星天顶角对AGRI资料偏差订正的影响,为将来实现AGRI红外通道辐射率资料在中尺度模式中的同化应用奠定基础。结果表明:1)通道8-10及14为正偏差,通道11-13为负偏差。水汽通道9和10偏差及其标准差相对较小,偏差海陆差异不明显。通道11-14探测高度较低,陆地上观测受地表发射率影响大,质量控制时可剔除这些通道陆地上的观测。2)各通道偏差随卫星天顶角变化的拟合直线斜率都小于0.035,对比试验结果表明偏差与卫星天顶角的关系不明显,预报因子中无需考虑卫星天顶角的作用。3)通道8及11-14的偏差随着目标亮温的变化比水汽通道9-10明显,偏差有较强的目标亮温依赖特征。4)根据分析的偏差特征对2018年5月13日18时-15日18时(世界时,下同)进行变分偏差订正试验,系统性偏差得到了有效的订正。

    Abstract:

    As the latest generation of geostationary meteorological satellite in our country, a great development has been made for Fengyun-4A(FY-4A). Compared with the previous generation(Fengyun-2),FY-4A has higher observation accuracy and shorter scanning time. Taking full advantage of AGRI data, the level of weather and meteorological disasters forecasting in countries along the " The Belt and Road Initiatives" will be effectively improved. The interface for the FY-4A AGRI (Advanced Geosynchronous Radiation Imager) data assimilation is complemented in WRFDA v3.9.1 (Weather Research and Forecasting model’s Data Assimilation v3.9.1) before investigating the bias’s characteristics of FY-4A AGRI data based on RTTOV v11.3 and GFS analysis. Bias-correction experiments of FY-4A AGRI data in infrared channel 8-14 are further conducted. The results show that: 1) Channel 8-10 and 14 have warm biases. There are cold biases in channel 11-13. Because the biases and standard deviation of water vapor channels 9 and 10 are small. The characteristics of biases show obvious differences between land and ocean in channels 11-14. The land’s biases are more complex than ocean’s. For these channels, observations on land can be eliminated in quality control. 2) The slope of linear regression equation between bias and satellite zenith angle is less than 0.035. There is no obvious dependence of biases on the satellite zenith angle.3) The bias in channels 8 and 11-14 show more obvious dependence on scene temperature than those in channels 9-10. 4) The variational bias correction experiment during 1800 UTC 13-15 May 2018 shows that the systematic bias has been corrected effectively.

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  • 收稿日期:2018-11-12
  • 最后修改日期:2019-06-12
  • 录用日期:2019-08-19
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