北极区域的FY-3C/VIRR热红外通道定标精度评估  

Evaluation of FYV3C/VIRR thermal infrared channel calibration in the Arctic

作　　者：李卓敏 管磊[1,2,3] LI Zhuomin;GUAN Lei(College of Information Science and Engineering,Ocean University of China,Qingdao 266100,China;Sanya Oceanographic Institution,Ocean University of China,Sanya 572024,China;Laboratory for Regional Oceanography and Numerical Modeling,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China)

机构地区：[1]中国海洋大学信息科学与工程学院,山东青岛266100 [2]中国海洋大学三亚海洋研究院,海南三亚572024 [3]青岛海洋科学与技术试点国家实验室区域海洋动力学与数值模拟功能实验室,山东青岛266237

出　　处：《海洋湖沼通报》2024年第1期38-46,共9页Transactions of Oceanology and Limnology

摘　　要：北极区域的海表温度(Sea Surface Temperature,SST)可以控制海冰增长、冰雪消融和表面大气能量交换,全球的温度变化及趋势在北极存在放大现象,因此北极海温的监测对于全球气候变化监测十分重要。卫星传感器热红外通道亮温数据可用于反演海表温度,其精度对于海表温度的精度有着至关重要的作用。本文以北极为研究区域,对搭载在FY-3C卫星上的可见光红外扫描辐射计(Visible and Infrared Scanning Radiometer,VIRR)热红外通道(11μm、12μm通道)定标精度进行评估,参考传感器为中分辨率成像光谱仪(Moderate-resolution Imaging Spectroradiometer,MODIS)。由于VIRR与MODIS的光谱响应有所不同,本文使用大气辐射传递模型MODTRAN(MODerate resolution atmospheric TRANsmission)进行VIRR和MODIS模拟亮温的计算,将海表参数和大气参数、海表发射率、卫星天顶角、VIRR和MODIS两通道对应的光谱响应曲线分别输入MODTRAN得到VIRR和MODIS两通道的模拟亮温,进而得到VIRR和MODIS 11μm、12μm通道光谱差异。根据VIRR和MODIS两通道观测亮温之差和光谱差异计算两者的实际差值,即二重差分值,得到白天11μm通道平均偏差为-0.41 K,标准偏差为0.26 K,12μm通道平均偏差为-0.47 K,标准偏差为0.30 K;夜间11μm通道平均偏差为-0.35 K,标准偏差为0.21 K,12μm通道平均偏差为-0.44 K,标准偏差为0.22 K。表明在北极区域VIRR热红外通道的定标精度较高。Sea surface temperature(SST) in the Arctic can control the growth of sea ice,the melting of ice and snow,and the exchange of surface atmosphere energy.Global temperature changes are amplified in the Arctic.Therefore,monitoring Arctic SST is important for studying global climate change.The brightness temperature of the thermal infrared channel of the satellite sensor can be used to retrieve SST,and its accuracy plays a vital role in the accuracy of SST.This paper took the Arctic as research area to evaluate the calibration accuracy of the Visible and Infrared Scanning Radiometer(VIRR) thermal infrared channels(11μm and 12μm channels) mounted on the FY-3C satellite.The reference sensor was Moderate-resolution Imaging Spectroradiometer(MODIS).Because the spectrum of VIRR and MODIS are different,this paper used the atmospheric radiation transfer model MODTRAN(MODerate resolution atmospheric TRANsmission) to calculate the simulated brightness temperature of VIRR and MODIS.The sea surface parameters and atmospheric parameters,the sea surface emissivity,the satellite zenith angle and the spectral response curve corresponding to the two channels of VIRR and MODIS were input into MODTRAN to obtain the simulated brightness temperature,and then the spectral difference of VIRR and MODIS was obtained.Based on the difference of observed brightness temperature and spectral difference,the average deviation of the 11μm channel was-0.41K,the standard deviation was 0.26K,the average deviation of the 12μm was-0.47K and the standard deviation was 0.30K during the day.The average deviation of the 11μm channel was-0.35K,the standard deviation was 0.21K,the average deviation of the 12μm channel was-0.44K,and the standard deviation was 0.22K at night.It showed that the calibration accuracy of VIRR thermal infrared channel was high in the Arctic.

关 键 词：VIRR MODIS 热红外通道 大气辐射传递模拟 

分 类 号：TP722.5[自动化与计算机技术—检测技术与自动化装置]