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	Estimation of Atmospheric Profiles From Hyperspectral Infrared IASI Sensor
	Wu H.
	2013
关键词	Atmospheric humidity profile atmospheric temperature profile hyperspectral thermal infrared IASI inverse problems remote sensing land-surface temperature sounding interferometer instrument 2-step physical algorithm simultaneous retrieval emissivity
英文摘要	A physics-based regression algorithm was developed and applied to the Infrared Atmospheric Sounding Interferometer (IASI) observations to estimate atmospheric temperature and humidity profiles. The proposed algorithm utilized three steps to solve the ill-posed problems and to stabilize the solution in a fast speed regression manner: 1) a set of optimal channels was selected to decrease the effect of forward model errors or uncertainties of trace gases; 2) the principal component analysis technique was used to reduce the number of unknowns; 3) a ridge regression procedure was introduced to improve the ill-conditioned problem and to lessen the influence of correlation. To determine the optimal coefficients of the algorithm, a simulated dataset was generated with the spectral emissivities and atmospheric profiles fully covering all the possible situations for clear sky conditions. Then, the accuracy of the algorithm was evaluated against with both simulated and actual IASI data. The root mean squared error (RMSE) of atmospheric temperature profile for the simulated data is about 1.5 K in troposphere and stratosphere and is close to 4 K near the surface with no biases. The RMSE of atmospheric humidity profile for the simulated data is about 0.001-0.003 g/g at low altitude. Although the retrieval accuracy for the actual IASI data is not as good as those for the simulated data, the vertical distribution of atmospheric profiles can be well captured. Those results showed that the proposed algorithm is promising when the profile bias errors could be removed.
出处	Ieee Journal of Selected Topics in Applied Earth Observations and Remote Sensing
卷	6
期	3
页	1485-1494
收录类别	SCI
语种	英语
ISSN号	1939-1404
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/30158]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Wu H.. Estimation of Atmospheric Profiles From Hyperspectral Infrared IASI Sensor. 2013.

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