华东师范大学学报(自然科学版) ›› 2019, Vol. 2019 ›› Issue (3): 186-198.doi: 10.3969/j.issn.1000-5641.2019.03.020

• 地理学 • 上一篇    下一篇

基于红外高光谱探测器的大气CO2反演通道选择

李璐含1,2, 束炯1,2, 尹球3, 张雷4, 刘延安1,2   

  1. 1. 华东师范大学 地理信息科学教育部重点实验室, 上海 200241;
    2. 华东师范大学 地理科学学院, 上海 200241;
    3. 中国气象局 卫星用户办公室, 上海 200030;
    4. 华东师范大学 信息科学技术学院 上海市多维度信息处理重点实验室, 上海 200241
  • 收稿日期:2018-03-05 出版日期:2019-05-25 发布日期:2019-05-30
  • 通讯作者: 束炯,男,教授,博士生导师,研究方向为气候变化与大气环境遥感.E-mail:jshu@geo.ecnu.edu.cn. E-mail:jshu@geo.ecnu.edu.cn
  • 作者简介:李璐含,女,硕士研究生,研究方向为气候变化与大气环境遥感.
  • 基金资助:
    国家自然科学基金(41271055,41601469);上海市气象局科技开发项目(YJ201408)

HIRAS channel selection for atmospheric CO2 retrievals

LI Lu-han1,2, SHU Jiong1,2, YIN Qiu3, ZHAGN Lei4, LIU Yan-an1,2   

  1. 1. Key Laboratory of Geographic Information Science(Ministry of Education), East China Normal University, Shanghai 200241, China;
    2. School of Geographic Sciences, East China Normal University, Shanghai 200241, China;
    3. Meteorological Satellite User's Office of China Meteorological Administration, Shanghai 200030, China;
    4. Shanghai Key Laboratory of Multidimensional Information Processing, School of Information Science Technology, East China Normal University, Shanghai 200241, China
  • Received:2018-03-05 Online:2019-05-25 Published:2019-05-30

摘要: 红外高光谱探测器(HIRAS)搭载于2017年11月15日发射的FY-3D卫星上,其探测范围覆盖15 μm及4.3 μm波段的CO2强吸收带,可用于反演CO2大气柱浓度,且可以与其他温室气体传感器数据比较印证,有助于组成全球CO2的监测星座.选择对CO2变化敏感而受其他参数干扰最小的波段,是卫星走向实用阶段前最重要的研究任务之一.本研究首先取HIRAS光谱分辨率较高的15 μm波段作为研究对象,利用逐线积分辐射传输模式,模拟了5种标准大气模式下卫星接收的大气出射辐射,分析了CO2与H2O、O3、地表温度和地表发射率等其他影响参数的敏感性;然后基于最优敏感性廓线选择的方法,以信噪比、CO2的响应和雅克比廓线为依据,选出了不同地区、不同季节背景下5组通道,并讨论了不同大气层结下通道特征的差异;最后假设在不同的仪器噪声下进行选择试验,指出了仪器噪声越低,越有助于选出CO2敏感高度在平流层的通道.通道选择的结果及特性亦可为未来同类仪器的设计提供参考.

关键词: CO2敏感性, 红外高光谱探测器, 通道选择, 风云三号

Abstract: The Hyperspectral Infrared Atmospheric Sounder (HIRAS) instrument onboard the Feng Yun-3D (FY-3D) satellite, launched on November 15, 2017, can be employed to retrieve column concentration of CO2 with strong absorption band sat 15 μm and 4.3 μm. The HIRAS contributes to monitoring constellations for global CO2 observation by comparison with data of other greenhouse gas sensors. Thus, the selection of a band which is concurrently sensitive to CO2 changes and resistant to interference from other parameters is one of the most critical tasks to enable use of the satellite for practical applications. First, based on the line-by-line radiative transfer model, the HIRAS radiance in the hyperspectral 15 μm band was simulated for five standard atmospheric models,and the responses of given channels to the perturbation of CO2 and other atmospheric components (H2O, O3, surface temperature, and emissivity) were analyzed. Second,using the signal-to-interference ratio,the CO2 response, and the Jacobian profiles as criteria, five different sets of channels for each condition were selected by the Optimal Sensitivity Profile (OSP) method; this was accompanied by a discussion of channel differences for different atmosphere stratification. Third, experiments involving different levels of instrumental noise showed that the lower the instrument's noise, the more helpful it is to select a CO2 sensitive height in the stratosphere. The results of the channel selection in this paper present references for instrument design in the future.

Key words: CO2 sensitivity, Hyperspectral Infrared Sounder, channel selection, Feng Yun 3

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