青海湖地区NCEP资料对风云二号C星热红外通道绝对辐射定标影响研究  

EFFECT OF NCEP DATA ON THE ABSOLUTE RADIOMETRIC CALIBRATION FOR THERMAL INFRARED BANDS OF FY2C IN QINGHAI LAKE

作　　者：童进军[1] 张勇[1] 胡博[2] 邱康睦[1] 许健民[1] 张玉香[1] 戎志国[1] 巴秀天 

机构地区：[1]中国气象局中国遥感卫星辐射测量和定标重点开放实验室国家卫星气象中心,北京100081 [2]中国气象局人事教育司,北京100081 [3]敦煌市气象局,甘肃敦煌736200

出　　处：《红外与毫米波学报》2008年第5期337-341,388,共6页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金资助项目(40675014)

摘　　要：为了分析大气廓线中温度和相对湿度变化对风云二号C星(FY-2C)热红外通道定标的影响,分别利用2005年6月25日青海湖场地定标试验的实际探空数据和对应时刻NCEP(美国国家环境预报中心)全球再分析大气廓线资料(简称NCEP资料)对FY-2C热红外通道进行定标计算,两种方法定标结果一致.利用2003年8月的14次青海湖实际探空数据和对应时刻的NCEP资料进行FY-2C热红外通道入瞳辐亮度和亮温的对比计算,利用辐射传输计算软件(MODTRAN 3.7)进行大气廓线对FY-2C热红外通道入瞳辐亮度和亮温的敏感性试验.计算结果表明对于青海湖地区,NCEP资料可用于FY-2C热红外通道的辐射定标计算.To analyze the effect of atmospheric profile on the absolute radiometric calibration for TIR bands of FY-2C, atmospheric profiles of real radio sound in Qinghai Lake on 25^th, June 2005 and NCEP reanalyzed data were respectively used to calculate the calibration coefficients. The calibrating results of these two method coincide with each other. At the same time, the entrance pupil radiance and radiance temperature of FY-2C TIR bands were calculated by using the fourteen atmospheric profiles of real radio sound of August, 2003 in Qinghai Lake and NCEP reanalyzed data, respectively. Then sensitive tests of atmospheric profiles to entrance pupil radiance and radiance temperature of FY-2C TIR bands were made by running MODTRAN3.7 model. All the results show that the NCEP reanalyzed data can be used to calculate the calibration coefficients without affecting the calibration precision.

关 键 词：全球再分析大气廓线资料 大气廓线 风云2号C星热红外通道 绝对辐射定标 

分 类 号：TP701[自动化与计算机技术—检测技术与自动化装置]