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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing. >First Level 1 Product Results of the Greenhouse Gas Monitoring Instrument on the GaoFen-5 Satellite
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First Level 1 Product Results of the Greenhouse Gas Monitoring Instrument on the GaoFen-5 Satellite

机译：首先第1级产品结果在高芬-5卫星上的温室气体监测仪器

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摘要

The Greenhouse Gas Monitoring Instrument (GMI) is a short-wavelength infrared (SWIR) hyperspectral-resolution spectrometer onboard the Chinese satellite GaoFen-5 that uses a spatial heterodyne spectroscopy (SHS) interferometer to acquire interferograms. The GMI was designed to measure and study the source and sink processes of carbon dioxide and methane in the troposphere where the greenhouse effect occurs. In this study, the processing and geometric correction algorithms of the GMI Level 1 product (radiance spectrum) are introduced. The spectral quality and greenhouse gas (GHG) inversion ability of the Level 1 products are analyzed, and the results illustrate that the specifications meet the mission’s requirements. An initial evaluation of the resolution, signal-to-noise ratio (SNR), and stability of the radiance spectrum reveals that the overall function and performance are within the design objectives. A comparison between our Level 1 products and the theoretical spectrum shows that the root mean square (rms) of the residual is approximately 0.8%, and the Level 1 products of the GMI captured within five months after observations have good spectral stability characteristics (less than 0.005 cm −1 for Band 1, 0.003 cm −1 for Band 2, 0.002 cm −1 for Band 3, and 0.004 cm −1 for Band 4). These results demonstrate that the GMI payload and the processing algorithm all work well and reliably. Furthermore, based on the Level 1 products, a GHG retrieval experiment is carried out, and the results are compared with data from Total Column Carbon Observing Network (TCCON) stations. The initial comparison of the XCO 2 results yields a value of 0.869 for ${R}^{2}$ (goodness of fit), 0.51 ppm for bias (mean of absolute error), and 0.53 ppm for ${sigma }$ (standard deviation of error). Similarly, the XCH 4 comparison yields values of 0.841 for ${R}^{2}$ , 4.64 ppb for bias, and 4.66 ppb for $ {sigma}$ .
机译：温室气体监测仪（GMI）是一种短波矩形（SWIR）高光谱分辨率分辨率光谱仪，用于使用空间外差光谱（SHS）干涉仪进行干涉图。 GMI旨在衡量和研究对流层中的对流层中二氧化碳和甲烷的源和水槽过程。在该研究中，引入了GMI级1产品（RADIACE SPICED）的处理和几何校正算法。分析了1级产品的光谱质量和温室气体（GHG）反转能力，结果说明了规范符合特派团的要求。初步评估分辨率，信噪比（SNR）和辐射谱的稳定性揭示了整体功能和性能在设计目标中。我们的1级产品与理论谱之间的比较表明，残留的根均方（RMS）约为0.8％，并且在观察后五个月内捕获的GMI的1级产品具有良好的光谱稳定性特征（小于0.005 cm -1 对于带1,00.003cm -1 带2，0.002 cm - 带3的1 ，0.004 cm - 带4的1 ）。这些结果表明，GMI有效载荷和加工算法一切顺利地工作。此外，基于1级产品，进行GHG检索实验，并将结果与​​来自总柱碳观察网络（TCCON）站的数据进行比较。 XCo 2 结果为<内联公式XMLNS产生0.869的值：mml =“http://www.w3.org/1998/math/mathml”xmlns：xlink =“http://www.w3.org / 1999 / xlink“> $ {r} ^ {2} $ （适合的良好），偏差为0.51 ppm（均值绝对误差）和<内联公式XMLNS的0.53ppm：mml =“http://www.w3.org/1998/math/mathml”xmlns：xlink =“http://www.w3.org/1999/ xlink“> $ { sigma} $ （错误的标准偏差）。同样地，Xch 4 比较会产生0.841的值<内联公式XMLNS：MML =“http://www.w3.org/1998/math/mathml”xmlns：xlink =“http://www.w3.org/1999/ XLINK“> $ {R} ^ {2} $ ，4.64 PPB for BIA，以及4.66 PPB for <内联 - 公式XMLNS： mml =“http://www.w3.org/1998/math/mathml”xmlns：xlink =“http://www.w3.org/1999/xlink”> $ { sigma} $ 。

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