气象2025，Vol.51Issue(4)：484-495,12.DOI:10.7519/j.issn.1000-0526.2024.121301
基于云顶高度产品的FY-4A云导风高度再指定方法研究
Height Reassignment Method of FY-4A Atmospheric Motion Vectors Based on Cloud Top Height Products
摘要
Abstract
The primary source of the bias of atmospheric motion vectors(AMVs)is related to inaccuracies in assigning heights.The cloud top height algorithm employed by China's new generation geostationary meteorological satellite FY-4A make use of both the infrared window channel and CO2 slicing channel.This leads to an improvement in its accuracy.In this study,cloud top height is used to correct AMVs of FY-4A satellite through spatiotemporal matching between the two products.Representative pixels within the AMVs tracking box are searched,and their average cloud top height is used to replace the original cloud height of the AMVs,achieving height reassignment.Verification using ERA5 reanalysis data shows that after height reassignment,the root mean square error(RMSE)of FY-4A infrared channel AMVs is significantly reduced across high,medium,and low layers.Specifically,the RMSE for the high layer de-creases from 4.06 m·s-1 to 3.25 m·s-1,for the medium layer from 4.25 m·s-1to 3.71 m·s-1,and for the low layer from 2.42 m·s-1to 2.13 m·s-1.Height reassignment alleviates the problem of AMVs being assigned to overly high altitudes,reducing biases,particularly improving slow motion biases.Case studies of the Northeast China cold vortex and Typhoon Chaba demonstrate that this method can improve the consistency between cloud-derived winds and the background field.Promising applications of this method in numerical weather prediction assimilation and weather process analysis are envisioned.关键词
云导风/云顶高度/高度再指定/代表运动像元/FY-4AKey words
atmospheric motion vectors/cloud top height/height reassignment/representative motion pixels/FY-4A satellite分类
天文与地球科学引用本文复制引用
马博良,陆其峰,王富,华维,张晓虎..基于云顶高度产品的FY-4A云导风高度再指定方法研究[J].气象,2025,51(4):484-495,12.基金项目
国家重点研发计划(2022YFC3004102)和温江国家气候观象台科研团队建设计划共同资助 （2022YFC3004102）
