Retrieval of CO from nadir remote-sensing measurements in the infrared by use of four different inversion algorithms
Retrieval of CO from nadir remote-sensing measurements in the infrared by use of four different inversion algorithms
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DOI：
10.1364/ao.41.007068
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发表时间：
2002-11-20
期刊：
影响因子：
1.9
通讯作者：
Luo, M
中科院分区：
文献类型：
--
作者：
Clerbaux, C;Hadji-Lazaro, J;Luo, M
基于不同反演方法的四种反演方案（数字气体相关，非线性最小二乘法，全球拟合调整，神经网络）开发，以检索CO从天底辐射测量的向下看卫星仪器，如对流层污染的测量（MOPITT），对流层发射光谱仪（TES），和红外大气探测干涉仪（IASI）的仪器进行了比较，无论是模拟的情况下，记录的温室气体干涉仪（IMG）的大气光谱。检索CO总柱量的敏感性，可能会影响反演精度（噪声，辅助温度分布，和水蒸气含量）的属性进行了研究。CO柱量的模拟辐射光谱同意在4%以内，而更大的差异时，得到的IMG仪器记录的大气光谱进行分析。假设的垂直温度分布被证明是一个关键参数，准确的CO反演。仪器的线形也被认为是参与这项研究的科学家小组提供的结果不一致的可能原因。(C)2002年美国光学学会。
Four inversion schemes based on various retrieval approaches (digital gas correlation, nonlinear least squares, global fit adjustment, and neural networks) developed to retrieve CO from nadir radiances measured by such downward-looking satelliteborne instruments as the Measurement of Pollution in the Troposphere (MOPITT), the Tropospheric Emission Spectrometer (TES), and the Infrared Atmospheric Sounding Interferometer (IASI) instruments were compared both for simulated cases and for atmospheric spectra recorded by the Interferometric Monitor for Greenhouse Gases (IMG). The sensitivity of the retrieved CO total column amount to properties that may affect the inversion accuracy (noise, ancillary temperature profile, and water-vapor content) was investigated. The CO column amounts for the simulated radiance spectra agreed within 4%, whereas larger discrepancies were obtained when atmospheric spectra recorded by the IMG instrument were analyzed. The assumed vertical temperature profile is shown to be a critical parameter for accurate CO retrieval. The instrument's line shape was also identified as a possible cause of disagreement among the results provided by the groups of scientists who are participating in this study. (C) 2002 Optical Society of America.