| 基于风云四号成像仪云产品的视场偏差订正和影响分析 |
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| 引用本文： | 狄迪,周镕连,赖睿泽.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,2022,80(4):632-642. |
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| 作者姓名： | 狄迪 周镕连 赖睿泽 |
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| 作者单位： | 1.南京信息工程大学大气物理学院，南京，210044 |
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| 基金项目： | 江苏省自然科学基金项目（BK20210662）、国家自然科学基金项目（42105126） |
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| 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，成像仪的云观测资料被广泛应用于气象领域的各项研究中。由于卫星的观测方式和地球曲率导致其存在视场偏差，与其他资料联合应用时需要考虑其影响。针对风云四号A星成像仪的视差问题，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，结果证实云顶高度越高或者卫星天顶角越大则视差越大, 尤其对具有更高空间分辨率的成像仪，视差影响更需要被重视。随即分别使用CALIPSO云层数据和3套台风最佳路径集来检验视差订正前、后的多通道扫描辐射成像仪（AGRI）云检测产品和台风中心定位的精度，结果证明所用的视差订正方法是有效的，并指出在静止气象卫星资料的精确定量应用中，视差不可忽视。
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| 关 键 词： | 风云四号成像仪 视差订正 云检测 台风中心定位 |
| 收稿时间： | 2021-10-18 |
| 修稿时间： | 2022-03-24 |
Parallax shift effect correction and analysis based on Fengyun-4A advanced imager |
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| Institution: | 1.School of Atmospheric Physics，Nanjing University of Information Science & Technology，Nanjing 210044，China2.School of Atmospheric Sciences，Nanjing University of Information Science & Technology，Nanjing 210044，China3.Guangzhou Institute of Tropical and Marine Meteorology，China Meteorological Administration，Guangzhou 510641，China |
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| Abstract: | The new generation of geostationary weather satellite imagers has the advantage of high spatial and temporal resolution, and cloud observations from the imagers are widely used in various studies in the field of meteorology. Due to the observation mode of the satellite and the curvature of the Earth, it has a parallax problem, the impact of which needs to be considered when it is jointly applied with other information. To address the parallax problem of the Fengyun-4A imager, the Advanced Geosynchronous Radiation Imager (AGRI), a sensitivity analysis was first performed using the simulated cloud top height and the actual satellite zenith angle, and the results confirmed that the higher the cloud top height or the larger the satellite zenith angle, the greater the parallax, especially for the imager with higher spatial resolution. Cloud data from the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) and three sets of typhoon best track sets were then used to examine the accuracy of AGRI cloud mask products and typhoon center positioning before and after the parallax correction. The results demonstrate the effectiveness of the parallax correction method used, and point out that parallax cannot be neglected in the accurate quantitative application of geostationary meteorological satellite datasets. |
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