基于FY-4A大气温度廓线数据的西北太平洋低云云顶高度反演研究  

Retrieval of cloud top height of low clouds over western North Pacificbased on FY-4A atmospheric temperature profile data

作　　者：李顺 衣立[1,2] 徐娜 时晓曚[4] 张苏平 刘敬武 LI Shun;YI Li;XU Na;SHI Xiaomeng;ZHANG Suping;LIU Jingwu(Frontiers Science Center for Deep Ocean Multispheres and Earth System,Ocean University of China,Qingdao 266100,China;College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao 266100,China;National Satellite Meteorological Center,Beijing 100081,China;Qingdao Meteorological Observatory,Qingdao 266003,China)

机构地区：[1]中国海洋大学深海圈层与地球系统前沿科学中心,山东青岛266100 [2]中国海洋大学海洋与大气学院,山东青岛266100 [3]国家卫星气象中心,北京100081 [4]青岛市气象台,山东青岛266003

出　　处：《海洋气象学报》2022年第4期85-94,共10页Journal of Marine Meteorology

基　　金：国家重点研发计划项目(2019YFC1510102);国家自然科学基金项目(41975024);风云卫星应用先行计划(2021)项目(FY-APP-2021.0406);青岛市气象局重点课题(2019qdqxz02)。

摘　　要：西北太平洋的低云云顶高度(cloud top height,CTH)是气候研究和气象灾害监测中的重要参数。研究中常用卫星数据获得大范围、连续变化的低云云顶高度,但其与实际的低云云顶高度存在较大的偏差。因此,基于低云云顶一般在低层逆温层底这一观测现象,提出一种利用FY-4A卫星大气垂直廓线数据反演低云云顶高度的方法(称为“逆温法”),并尝试用于西北太平洋低云云顶高度反演研究。利用星载激光雷达CALIPSO(Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation)探测的低云云顶高度,检验FY-4A卫星的云顶高度产品(CTH_(AGRI))和“逆温法”反演的低云云顶高度结果(CTH_(GIIRS)),表明两者均显著偏低,与CALIPSO探测的云顶高度差分别为-0.49 km和-0.27 km,相较而言,“逆温法”反演的低云云顶高度更接近CALIPSO的探测结果,优于FY-4A卫星的云顶高度产品。The cloud top height(CTH)of low clouds over western North Pacific is an important parameter in climate research and meteorological disaster monitoring.Satellite data are commonly used to obtain the low cloud CTH with a wide range and continuous changes,but its products have large deviations from the actual low cloud CTH.Therefore,based on the observation phenomenon that the cloud top of low clouds is generally located at the bottom of the low-level temperature inversion layer,a method of retrieving the low cloud CTH from the atmospheric vertical profile data of FY-4A satellite(called“temperature inversion rnethod”)is proposed,and it is applied in the retrieval study of low cloud CTH over western North Pacific.Using the low cloud CTH detected by the spaceborne lidar CALIPSO(Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation),the CTH product(CTH_(AGRI))of FY-4A satellite and the low cloud CTH results(CTH_(GIIRS))obtained by the temperature inversion method in this paper are verified over western North Pacific.The results show that both results of CTH_(AGRI) and CTH_(GIIRS) are significantly lower than those of CALIPSO,with a difference of-0.49 km and-0.27 km,respectively.It is also found that the low cloud CTH retrieved in this paper is closer to the detection result of CALIPSO and is superior to the CTH product of FY-4A satellite.

关 键 词：低云 风云四号A星 云顶高度 逆温层 

分 类 号：P423[天文地球—大气科学及气象学]