狄迪,周镕连,赖睿泽. 2022. 基于风云四号成像仪云产品的视场偏差订正和影响分析[J]. 气象学报, (0):-, doi:[doi]
基于风云四号成像仪云产品的视场偏差订正和影响分析
Parallax Shift Effect Correction and Analyze Based on FengYun-4A Advanced Imager
投稿时间:2021-10-13  修订日期:2022-03-24
DOI:
中文关键词:  风四成像仪  视差订正  云检测  台风中心定位
英文关键词:AGRI  parallex correction  cloud mask  typhoon best track
基金项目:省自然科学基金、国家自然科学基金
作者单位邮编
狄迪 南京信息工程大学 210044
周镕连 南京信息工程大学 210044
赖睿泽 中国气象局广州热带海洋气象研究所
、中国气象局广州热带海洋气象研究所 
510641
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中文摘要:
      新一代静止气象卫星成像仪具有高时空分辨率的优势,成像仪的云区资料被广泛应用于气象领域的各项研究中,而由于卫星的观测方式和地球曲率导致其存在视场偏差问题,与其他资料联合应用时需要考虑其影响。本文针对风云四号卫星成像仪(AGRI)的视差问题展开研究。首先使用模拟的云顶高度和实际的卫星天顶角进行敏感性分析,证实云顶高度越高或者卫星天顶角越大则视差越大, 尤其对未来具有更高空间分辨率的成像仪,视差影响更加显著。随之采用CALIPSO云层数据和AGRI云检测产品以及利用实时卫星云图资料与中国气象局、日本气象局和国际气候管理最佳路径档案的台风最佳路径集对201909号“利奇马”台风开展视差订正方法的检验,证明了本文采用的视差订正方法的有效性。本文的结论:由于新一代卫星成像仪高空间分辨率的特点,利用其云区资料进行云检测以及台风相关的定量研究时,需考虑视差订正。
英文摘要:
      Cloud observations and products from advanced imgaers carried on new-generations geostationary satellites are widely applied in community due to their high accuracy and temperal-spatial resolutions. However, cloud parallax shift occurs in satellite imaging, especially for observations with clouds. Parallex shift correction method has been conducted for cloud product from Fengyun-4A Advanced Geosynchronous Radiation Imager (AGRI) and its effect has been analyzed. The sensitivity test shows that larger zenith angle and cloud with higher altitude, such as deep convection cloud could lead to larger parallex shift, which could not been ignored for advanced imager with high spatial resolution. Compared with the cloud products from Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO), the accuracy of cloud mask products from AGRI with parallex shift correction has been slightly improved. The typhoon eye of typhoon Lekima seen with the 11um window band of AGRI is closer to best track products generated at China Meteorology Administration (CMA), Japan Meteorology Agency (JMA) and International Best Track Archive for Climate Stewardship (IBTrACS). This study demonstates the necessity of parallex correction for current advanced imagers , especially future advanced imager with higher spatial resolutions such as FY-4C imager.
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