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ISSN 1006-9895

CN 11-1768/O4

碳卫星高光谱二氧化碳探测仪基于太阳夫琅禾费吸收线的在轨光谱定标
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1.National Satellite Meteorological Centre, CMA, CHINA;2.国家卫星气象中心

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国家高技术研究发展计划


TanSat ACGS on-orbit spectral calibration by use of Fraunhofer lines
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National Satellite Meteorological Centre, CMA, CHINA

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    摘要:

    大气二氧化碳(CO2)探测仪(Atmospheric Carbon dioxide Grating Spectrometer-ACGS)搭载于中国二氧化碳观测卫星(TanSat),通过探测0.76μm,1.61μm,2.06μm波段的反射太阳光谱,采用最优估计算法反演大气CO2浓度。满足高光谱分辨率和高精度CO2浓度反演需求,精确探测光谱中心波长的变化非常重要。本文以高分辨率太阳参考光谱的夫朗禾费吸收线作为参考基准,利用ACGS对太阳的观测光谱计算了ACGS三个谱段通道中心波长位置在一年内的变化情况。结果显示,三个谱段的波长变化在光谱分辨率10%的以内,满足光谱定标精度需求。这种变化可能是由于在轨仪器状态变化引起,特别是在轨运行温度变化引起的。ACGS波长的微小变化需要在产品反演中进行修正。基于独立太阳夫琅禾费吸收线的在轨光谱定标方法不仅可以有效监测ACGS的光谱稳定性,还可以为L2产品的处理的提供参考信息 。

    Abstract:

    The spectra measured by the Atmospheric Carbon dioxide Grating Spectrometer (Atmospheric Carbon dioxide Grating Spectrometer - ACGS) carried by the China’s global carbon dioxide observation satellite (TanSat) in the band of 0.76μm, 1.61μm and 2.06μm can be used for the retrieval of carbon dioxide (CO2) concentrations by fitting the observations and simulations using the optimal estimation algorithm. Accurately detecting the change of the center wavelength is highly important because of its very high spectral resolution and accuracy requirement for product retrieval. The variations of center wavelength for all three bands of ACGS have been calculated on the locations of the individual solar absorption lines by comparing the solar-viewing measurements and the high-resolution solar reference spectrum. The variations with magnitudes less than 10% of the spectral resolution for each band have been detected. The changes are probably caused by vibration and the instrument status difference between the ground and space, especially temperature variation on orbit. The scheme described here can be used not only for monitoring spectral stability but also to gain spectral knowledge prior to the level-2 product processing. These minor temporal changes of wavelength on orbit should be corrected in the product retrieval.

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历史
  • 收稿日期:2021-04-22
  • 最后修改日期:2021-08-11
  • 录用日期:2021-08-27
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