气象科技进展Issue(4)：71-83,13.DOI:10.3969/j.issn.2095-1973.2013.04.008
风云三号A星中分辨率光谱成像仪反射太阳波段辐射定标
Calibration for the Solar Relfective Bands of Medium Resolution Spectral Imager Onboard FY-3A
摘要
Abstract
The Medium Resolution Spectral Imager (MERSI) is a key instrument onboard Fengyun-3 (FY-3), the second generation of polar-orbiting meteorological satellites in China. This paper summarizes the knowledge of MERSI instrument in terms of sensor design, calibration algorithm, prelaunch and on-orbit characterization, and performance veriifcation. The calibration monitoring of its relfective solar bands (RSBs) is primarily conducted using a visible onboard calibrator and found that it has a signiifcant degradation on the order of 10%in its shorter RSB bands (<500 nm), with the largest in band 8 of about 20%during the past two years. However, the performance at longer wavelength bands is relatively stable with a change of less than 5%. It is shown that the postlaunch calibration of the two short-wavelength infrared bands has frequent lfuctuations because of random jumps in their electronic gains. These results are consistently veriifed by two kinds of vicarious calibration (VC) methods:China Radiometric Calibration Sites VC and intercalibration using Terra/Moderate Resolution Imaging Spectroradiometer over Dunhuang desert. The overall uncertainty in the MERSI top-of-atmosphere radiance or relfectance is less than 5%. These results provide the important reference and evaluation for the update of the FY-3A/MERSI calibration coefifcients.关键词
衰减率/仪器性能跟踪/中分辨率光谱成像仪/反射太阳波段定标/替代定标Key words
Degradation rate/instrument monitoring/Medium Resolution Spectral Imager (MERSI)/solar reflective band calibration/vicarious calibration (VC)引用本文复制引用
胡秀清,孙凌,刘京晶,丁雷,王向华,李元,张勇,徐娜,陈林..风云三号A星中分辨率光谱成像仪反射太阳波段辐射定标[J].气象科技进展,2013,(4):71-83,13.基金项目
973计划项目（2010CB951600和2010CB950802）；863计划项目（2007AA12Z145）；公益性行业（气象）科研专项（GYHY200906036）；科技部国际科技合作专项 （）
