基于动态背景场沙尘覆盖度指数的Himawari-8沙尘判识及强度估算方法  

An Algorithm for Dust Detection and Intensity Estimation Based on Himawari-8 Using Fractional Dust Cover Index by Dynamic Background

作　　者：李彬[1,2] 孙小龙 蒋姗姗[3] 卢士庆 李云鹏 李静[4] LI Bin;SUN Xiao-long;JIANG Shan-shan;LU Shi-qing;LI Yun-peng;LI Jing(Inner Mongolia Eco-and Agro-Meteorological Center,Hohhot 010051,China;Inner Mongolia Data and Application Center of High Resolution Earth Observation System,Hohhot 010051,China;Tongliao Meteorological Bureau,Tongliao 028000,China;Mandura Weather Station,Baotou 014000,China)

机构地区：[1]内蒙古自治区生态与农业气象中心,呼和浩特010051 [2]高分辨率对地观测系统内蒙古数据与应用中心,呼和浩特010051 [3]通辽市气象局,通辽028000 [4]满都拉气象站,包头014000

出　　处：《科学技术与工程》2023年第19期8308-8317,共10页Science Technology and Engineering

基　　金：内蒙古自治区气象局科技创新项目(nmqxkjcx202320);内蒙古自然科学基金(2021MS04026);通辽市科技计划;内蒙古自然科学基金(2022MS04015)。

摘　　要：针对沙尘遥感监测开展的研究很多,但对于一些强度较弱的沙尘,在不同地表状态下呈现的复杂状况,传统方法识别效果较差。采用Himawari-8卫星数据,提出一种针对性的识别方法,基于动态亮温差底图引入了沙尘覆盖度指数(fractional dust cover index,FDCI)。该指数在一个较确定范围内对不同强度沙尘都可进行有效判识,并能提升弱沙尘识别效果。在此基础上构建了基于指数判识结果的沙尘强度指数(enhanced dust intensity index,EDII)估算方法。文中列举了4次沙尘过程的判识结果,并结合地面观测数据进行了验证。其中对2017年5月3日沙尘强度的地面验证表明,位于观测区的27个站中有22个站的地面观测沙尘强度与估算结果一致。对于各种地表及强度条件下的沙尘监测,该方法是对分裂窗亮温差法的有效改进。Many studies on dust detection by remote sensing have been carried out in the past.However,for the thin dust and complex conditions on various surface,the effect of traditional methods was poor.Himawari-8 data were used to propose a targeted method,thus the fractional dust cover index(FDCI)was introduced based on the dynamic brightness temperature background map.The index could effectively identify dust with different intensities,and improve the identification accuracy of thin dust.At the same time,an enhanced dust intensity index(EDII)method for estimating the dust intensity index was proposed based on the results.The identified results of four dust weather were given and verified by the ground observation.The ground verification of the dust intensity on May 3,2017 showed that the dust intensity observed on the ground was consistent with the estimated results at 22 stations.For various surface and dust intensity,this method was an effective improvement of the brightness temperature difference.

关 键 词：沙尘覆盖度指数(FDCI) 热红外亮温差 沙尘 Himawari-8 沙尘强度 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]