Discrimination and correction for solar contamination on mid-infrared band of FY-3C/VIRR

XU Han-lie; HU Xiu-qing; XU Na; MIN Min

doi:10.3788/OPE.20152307.1874

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Discrimination and correction for solar contamination on mid-infrared band of FY-3C/VIRR

更新时间：2020-08-12

- Discrimination and correction for solar contamination on mid-infrared band of FY-3C/VIRR
- Optics and Precision Engineering Vol. 23, Issue 7, Pages: 1874-1879(2015)
- 作者机构：
  
  国家卫星气象中心中国遥感卫星辐射测量与定标重点开放实验室, 北京 100081
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152307.1874
  CLC： P414.4;TP732+.2
- Received：17 March 2015，
  
  Revised：07 May 2015，
  
  Published：25 July 2015
- 稿件说明：
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徐寒列, 胡秀清, 徐娜等. FY-3C/可见光红外扫描辐射计中红外通道太阳污染的识别和修正[J]. 光学精密工程, 2015,23(7): 1874-1879

XU Han-lie, HU Xiu-qing, XU Na etc. Discrimination and correction for solar contamination on mid-infrared band of FY-3C/VIRR[J]. Editorial Office of Optics and Precision Engineering, 2015,23(7): 1874-1879
徐寒列, 胡秀清, 徐娜等. FY-3C/可见光红外扫描辐射计中红外通道太阳污染的识别和修正[J]. 光学精密工程, 2015,23(7): 1874-1879 DOI： 10.3788/OPE.20152307.1874.

XU Han-lie, HU Xiu-qing, XU Na etc. Discrimination and correction for solar contamination on mid-infrared band of FY-3C/VIRR[J]. Editorial Office of Optics and Precision Engineering, 2015,23(7): 1874-1879 DOI： 10.3788/OPE.20152307.1874.

摘要

基于风云-3C/可见光红外扫描辐射计(FY-3/CVIRR)的中红外通道(3.7

m)的太阳污染现象和发生规律

分析了太阳污染出现的时空特征

提出了初步判识并修正北半球太阳污染数据的方法

并就太阳污染对定标系数和黑体亮温的影响做了定量的评估。结果表明

对于FY-3C/VIRR的中红外通道

太阳光线照射到定标黑体时所形成的北半球高纬度太阳污染主要出现在太阳天顶角在85°~118°之间的位置时;由太阳污染导致的该区域地球观测亮温日平均偏差为4.5 K左右

最大偏差达到15 K左右。通过对逐日太阳污染数据进行识别

并采用污染前后定标系数进行线性求差值

可以初步修正太阳污染对定标系数带来的异常影响。

Abstract

On the basis of solar contamination phenomenon and occurrence rules of the mid-infrared channel (3.7

m) in the Fengyun-3C/Visible and Infrared Radiometer(FY-3C/VIRR)

temporal and spatial characteristics of the solar contamination were analyzed. The method to discriminate initially and correct the solar contamination data in the northern hemisphere was proposed and the effect of solar contamination on calibration coefficients and blackbody brightness temperature was evaluated quantitatively. The results show that for the mid-infrared channel (3.7

m) in the FY-3C/VIRR

the solar contamination in the northern hemisphere caused by the sun irradiation on calibrated blackbody will appear at the solar zenith angle between 85°-118°. The daily mean absolute error of blackbody temperature is up to 4.5 K

and the maximum absolute error in a day is up to 15 K. By discrimination of the solar contamination data day by day and calculating the linear difference of calibration coefficients before and after contaminations

the effect of solar contamination on calibration coefficients can be corrected initially.

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references

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