Detection of nighttime sea fog/stratus over the Huang-hai Sea using MTSAT-1R IR data  

作　　者：GAO Shanhong WU Wei ZHU Leilei FU Gang HUANG Bin 

机构地区：[1]Physical Oceanography Laboratory, Ocean University of China, Qingdao 266003, China [2]Shandong Provincial Meteorological Institute, Jinan 250031, China [3]National Meteorological Center, China Meteorological Administration, Beijing 100081, China

出　　处：《Acta Oceanologica Sinica》2009年第2期23-35,共13页海洋学报（英文版）

基　　金：The National Natural Science Foundation of China under contract No. 40706004;the National Basic Research Program ("973" program) of China under contract No. 2005CB422301;China Meteorological Administration’s New Technology Extension Project under contract No. CMATG2008M41;the National Special Fund for public Sector Research of China under contract No. GYHY200706031;Shandong Provincial Meteorological Bureau Science Fund of China under contract No. 2004SDQXJ01.

摘　　要：A dual channel difference （DCD） method is applied to detect nighttime sea fog/stratus over the Huanghai Sea using the infrared （IR） data of shortwave （3.5-4.0 μm） and longwave （10.3-11.3 μm） channels from the Multi-functional Transport Satellite （MTSAT）-IR, i.e., shortwave minus longwave brightness temperature difference （SLTD）. Twenty-four sea fog events over the Huanghai Sea during March to July of 2006 and 2007 are chosen to determine a suitable value of SLTD for nighttime sea fog/stratus detection, and it is found that the value of-5.5-2.5℃ can be taken as a criterion. Two case examples of sea fog events are especially demonstrated in detail utilizing the criterion, and the results show that the derived sea fog/stratus coverage is quite reasonable. This coverage information is very helpful to analyze the formation and evolution of sea fog/stratus during night and can provide sea fog researchers with observational evidences for model results verification. However, more efforts are needed to further obtain vertical extent information of sea fog/stratus and attempt to discriminate between sea fog and stratus.A dual channel difference （DCD） method is applied to detect nighttime sea fog/stratus over the Huanghai Sea using the infrared （IR） data of shortwave （3.5-4.0 μm） and longwave （10.3-11.3 μm） channels from the Multi-functional Transport Satellite （MTSAT）-IR, i.e., shortwave minus longwave brightness temperature difference （SLTD）. Twenty-four sea fog events over the Huanghai Sea during March to July of 2006 and 2007 are chosen to determine a suitable value of SLTD for nighttime sea fog/stratus detection, and it is found that the value of-5.5-2.5℃ can be taken as a criterion. Two case examples of sea fog events are especially demonstrated in detail utilizing the criterion, and the results show that the derived sea fog/stratus coverage is quite reasonable. This coverage information is very helpful to analyze the formation and evolution of sea fog/stratus during night and can provide sea fog researchers with observational evidences for model results verification. However, more efforts are needed to further obtain vertical extent information of sea fog/stratus and attempt to discriminate between sea fog and stratus.

关 键 词：Huanghai Sea nighttime sea fog MTSAT-1R dual channel difference method 

分 类 号：P412.15[天文地球—大气科学及气象学] V474.292[航空宇航科学与技术—飞行器设计]