On-board vicarious calibration of FY-3C UV total ozone unit

Zhuo ZHANG; Wei-he WANG; Hou-mao WANG

doi:10.3788/OPE.20192702.0326

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On-board vicarious calibration of FY-3C UV total ozone unit

Modern Applied Optics | 更新时间：2020-08-13

- On-board vicarious calibration of FY-3C UV total ozone unit
- Optics and Precision Engineering Vol. 27, Issue 2, Pages: 326-333(2019)
- 作者机构：
  
  1.中国科学院国家空间科学中心，北京 100190
  2.中国科学院大学，北京 100049
  3.国家空间科学中心空间环境探测研究室，北京100190
  4.天基空间环境探测北京市重点实验室，北京 100190
  5.中国科学院空间环境态势感知技术重点实验室，北京 100190
  6.国家气象局卫星气象中心，北京 100081
  7.中国科学院大学天文与空间科学学院，北京 100049
- 作者简介：
  
  王维和(1964－)，男，辽宁新民人，学士，正研级高级工程师，1986年于北京大学获得学士学位，主要从事星载紫外探测仪定标和数据处理工作。E-mail：wangwh@cma.gov.cn WANG Wei-he, E-mail: wangwh@cma.gov.cn
- 基金信息：
- DOI：10.3788/OPE.20192702.0326
  CLC： TP722.3;X87
- Received：16 March 2018，
  
  Accepted：08 May 2018，
  
  Published：2019-02
- 稿件说明：
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Zhuo ZHANG, Wei-he WANG, Hou-mao WANG. On-board vicarious calibration of FY-3C UV total ozone unit[J]. Optics and precision engineering, 2019, 27(2): 326-333.
DOI：

Zhuo ZHANG, Wei-he WANG, Hou-mao WANG. On-board vicarious calibration of FY-3C UV total ozone unit[J]. Optics and precision engineering, 2019, 27(2): 326-333. DOI： 10.3788/OPE.20192702.0326.

摘要

风云三号气象卫星C星(FY-3C)搭载的紫外臭氧总量探测仪因太阳辐照度观测值异常而无法进行常规在轨星上定标，导致臭氧总量产品无法正常生成。在研究了风云三号气象卫星B星(FY-3B)TOU辐照度观测数据的特点以及仪器衰减规律后，结合FY-3C/TOU辐照度和辐亮度实测数据，探索了基于晴空海洋像元观测值计算仪器的衰减系数法。本文选取受陆地气溶胶影响较小的热带太平洋海区，用矢量辐射传输模式模拟云量较小的像元对应的晴空辐亮度，比较观测值与模拟计算值，通过统计筛选晴空像元，估算FY-3C/TOU探测器随时间的衰减系数。在确定仪器衰减系数后对FY-3C/TOU历史数据进行处理，反演获得了全球臭氧总量并与WMO/WOUDC地基观测数据进行对比。结果表明，基于晴空辐亮度估算的仪器衰减系数进行的臭氧总量反演的均方根误差在5%以内。在星载紫外探测器星上辐射定标失败的时候，可以利用晴空海洋像元确定仪器的定标系数。

Abstract

Previously

ozone products could not be generated due to the abnormal solar irradiance for a total ozone unit (TOU) on FY-3C

because the instrumental degradation coefficient could not be measured. After investigating the irradiation measurement data and degradation trends of FY-3B/TOU and combining this with FY-3C/TOU radiance and irradiance data

methods for calculating instrumental degradation coefficients were explored based on clear ocean pixel data. An area in the atmosphere above the Pacific Ocean was chosen as a representative "clean" atmospheric sample

which is an area without pollution

to calculate the radiation from the earth and the model radiation with a vector radiative transfer mode. By selecting clear pixels and comparing measured and modeled values

the FY-3C/TOU instrument degradation with time was evaluated. On comparing the new total ozone results with WMO/WOUDC data

it is found that the change in the satellite monitoring data over time and the site results agreed well. Further

the mean square error of the two results is within 5%. Thus

the clear-sky pixels method for FY-3C/TOU works well and has the potential to solve problems regarding in-orbit radiation calibrations.

关键词

Keywords

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