基于气象卫星数据的我国沿海悬空波导反演方法初步研究

An Preliminary Research on Inversion Method of Elevated Duct from Meteorological Satellite Observation over Chinese Regional Seas

悬空波导的测量方法有直接测量和间接测量两种.传统的直接测量手段只能得到单点的波导信息.间接测量也存在一定的局限性,不能获取高时空分辨率的波导多维空间信息.而静止气象卫星由于其高时空分辨率观测的特点,能对我国沿海海域大气环境进行时空四维监测.文中借鉴国外一种基于气象卫星数据反演悬空波导的方法,利用我国静止气象卫星FY-2G的云分类和云顶温度数据、地面观测数据及探空数据,分析该方法中各影响因素的敏感性,初步检验了该方法在我国沿海的适用性.提出建立本地海域悬空波导反演方法的几个关键问题:①选用高精度云顶温度反演数据;②选择合适规定层(850hPa或700hPa);③根据本地数据得到一些参量的经验值;④建立本地参数化方案.下一步将寻找更多我国不同沿海海域的事例进行验证,该方法有希望运用到我国沿海大气波导监测中,为我国沿海大气波导监测和反演提供一种新方法新技术.

Elevated duct can be measured through direct or indirect ways.Nevertheless,both of these traditional methods are inadequate because direct measurement can only obtain single-point information,while indirect measurement can not obtain multidimensional information with high temporal and spatial resolution.Geostationary meteorological satellite can be used to monitor ocean atmospheric environment because of its ability to capture four-dimensional information with high temporal and spatial resolution.This paper presents a foreign inversion method of elevated duct based on geostationary meteorological satellite data,and the applicability of this method was verified with cloud classification and cloud top temperature productions from FY-2 G,ground-based meteorological observation and radiosonde data in Chinese regional seas.Several key research aspects are needed to be solved for setting up the method in Chinese regional seas as,which include: Using high-precision cloud-top temperature data,selecting appropriate standard pressure level from 850 hPa or 700 hPa,obtaining values of empirical parameters according to local-area radiosonde data,and setting up a local parameterization schemes.The verification of applicability for the method in Chinese regional seas will be carried out,positive result of which can potentially see as an effective new means used in monitoring elevated duct in Chinese regional seas.