Cross-calibration of VIRR/FY-3A split-window channels with AIRS/AQUA and IASI/METOP-A data

ZHOU Wei; JIANG Geng-ming

doi:10.3788/OPE.20152307.1892

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Cross-calibration of VIRR/FY-3A split-window channels with AIRS/AQUA and IASI/METOP-A data

更新时间：2020-08-12

- Cross-calibration of VIRR/FY-3A split-window channels with AIRS/AQUA and IASI/METOP-A data
- Optics and Precision Engineering Vol. 23, Issue 7, Pages: 1892-1902(2015)
- 作者机构：
  
  复旦大学电磁波信息科学教育部重点实验室上海,200433
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152307.1892
  CLC： TP73;P414.4
- Received：20 March 2015，
  
  Revised：15 April 2015，
  
  Published：25 July 2015
- 稿件说明：
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周蔚, 蒋耿明,. VIRR/FY-3A分裂窗波段与AIRS/AQUA和IASI/METOP-A数据的交叉辐射定标[J]. 光学精密工程, 2015,23(7): 1892-1902

ZHOU Wei, JIANG Geng-ming,. Cross-calibration of VIRR/FY-3A split-window channels with AIRS/AQUA and IASI/METOP-A data[J]. Editorial Office of Optics and Precision Engineering, 2015,23(7): 1892-1902
周蔚, 蒋耿明,. VIRR/FY-3A分裂窗波段与AIRS/AQUA和IASI/METOP-A数据的交叉辐射定标[J]. 光学精密工程, 2015,23(7): 1892-1902 DOI： 10.3788/OPE.20152307.1892.

ZHOU Wei, JIANG Geng-ming,. Cross-calibration of VIRR/FY-3A split-window channels with AIRS/AQUA and IASI/METOP-A data[J]. Editorial Office of Optics and Precision Engineering, 2015,23(7): 1892-1902 DOI： 10.3788/OPE.20152307.1892.

摘要

实际应用显示搭载在风云三号A星(FY-3A)上的可见光红外扫描辐射计(VIRR)的两个分裂窗波段(IR4

~10.8

m;IR5

~12.0

m)存在定标偏差。本文选择高光谱卷积法

用AQUA卫星搭载的大气红外探空仪(AIRS/AQUA)和METOP-A卫星搭载的干涉式红外大气探测仪(IASI/METOP-A)的观测数据对VIRR/FY-3A的两个分裂窗波段进行交叉辐射定标。根据卫星轨道特点

选择北极地区(60°N~90°N

180°W~180°E)作为研究区域

并选择2010年6月、9月、12月以及2011年3月作为研究时间段。首先

分别将AIRS/AQUA和IASI/METOP-A数据与VIRR/FY-3A的第4波段和第5波段的光谱响应函数进行卷积;对观测数据进行重采样

并基于普朗克黑体辐射公式实现辐射值和亮度温度之间的转换。然后

使用两个相关的匹配条件提取VIRR/FY-3A分别与AIRS/AQUA、IASI/METOP-A在第4波段和第5波段的匹配观测点对。最后

对匹配观测点对进行回归分析

得到交叉辐射定标偏差订正方程的系数。结果表明AIRS/AQUA和IASI/METOP-A的在轨辐射定标非常一致。以AIRS/AQUA和IASI/METOP-A波段的辐射定标为标准

VIRR/FY-3A第4波段的平均定标偏差分别为2.39 K和2.06 K

第5波段的平均定标偏差分别为0.59 K和0.44 K。实验指出定标偏差与亮度温度有关。

Abstract

Some practical applications indicate that there is calibration deviation in the on-orbit radiometric calibration of the two split-window channels(IR4

~10.8

m;IR5

~12.0

m) on the Visible and Infrared Radiometer(VIRR) mounted in FY-3A. Therefore

this paper applies high-spectral convolution method to implementation of the cross radiometric calibration for the two spilt-window channels of VIRR/FY-3A based on the observation data from the Infrared Atmospheric Sounding Interferometer/METOP-A(IASI/METOP-A)and the Atmospheric Infrared Sounder/AQUA(AIRS/AQUA). According to the characteristics of the satellite orbit

the Arctic region (60°N-90°N

180°W-180°E) was chosen as the research area

and June

September

December 2010 and March 2011 were selected as the research satellite orbit spectral response functions of the 4th and 5th channels of VIRR/FY-3A. Then

the Planck blackbody radiation formula was used to achieve the conversion between radiation value and brightness temperature. On the basis on the corresponding matching conditions

the matching observation points between the 4th and 5th channesl of VIRR/FY-3A and AIRS/AQUA

the 4th and 5th channels of VIRR/FY-3A and IASI/METOP-A were extracted

respectively. Finally

the regression of matching observation point pairs was analyzed to obtain the cross radiometric calibration coefficients. The experimental results show that the proposed high-spectral convolution method with IASI/METOP-A and AIRS/AQUA for the cross calibration has the same calibration results. By using IASI/METOP-A and AIRS/AQUA as the standard

the brightness temperature biases for the 4th channel of VIRR/FY-3A are 2.39 K and 2.06 K; and those for the 5th channel of VIRR/FY-3A are 0.59 K and 0.44 K. This work indicates that calibration deviation is related to the brightness temperature.

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