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On the information content of the thermal infrared cooling rate profile from satellite instrument measurements

Feldman, D. R. and Liou, K. N. and Shia, R. L. and Yung, Y. L. (2008) On the information content of the thermal infrared cooling rate profile from satellite instrument measurements. Journal of Geophysical Research D, 113 . D11118. ISSN 0148-0227. doi:10.1029/2007JD009041.

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This work investigates how remote sensing of the quantities required to calculate clear-sky cooling rate profiles propagates into cooling rate profile knowledge. The formulation of a cooling rate profile error budget is presented for clear-sky scenes given temperature, water vapor, and ozone profile uncertainty. Using linear propagation of error analysis, an expression for the cooling rate profile covariance matrix is given. Some of the features of the cooling rate covariance matrix are discussed, and it is found that nonzero error correlations in the temperature, water vapor, and ozone retrieval profiles must be considered to produce an unbiased estimate of cooling rate profile variance and the covariance structure. To that end, the exclusion of the details of this error correlation leads to an underestimation of the cooling rate profile uncertainty. This work then examines the assumptions made in the course of deriving the expression for the cooling rate covariance matrix by using ERA-40 Reanalysis data. It is established that the assumptions of linear error propagation and Gaussian statistics are generally tenable. Next, the information content of thermal infrared spectra with respect to clear-sky cooling rate profiles is investigated. Several formerly- and currently-operational spectrometers are compared with different spectral coverage, resolution, signal-to-noise ratio. Among these, IASI is found to have the ability to provide the greatest amount of information on the cooling rate profile. Also, it may be scientifically useful to develop far-infrared missions in terms of cooling rate profile analysis.

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Yung, Y. L.0000-0002-4263-2562
Additional Information:Copyright 2008 by the American Geophysical Union. Received 4 June 2007; revised 25 January 2008; accepted 25 February 2008; published 13 June 2008. This research was supported by the NASA Earth Systems Science Fellowship, grant NNG05GP90H. Yung was supported by NASA grant to JPL under the MAP program. Invaluable technical support was provided by Tony Clough, Mark Iacono, and Mark Shepard at AER, Inc. Other support was provided by Marty Mlynczak and David Johnson of the NASA Langley Research Center. The author would also like to acknowledge the help provided by the Yuk Yung Radiation Group including Jack Margolis, Vijay Natraj, Xin Guo, Kuai Le, King-Fai Li, Mao-Chang Liang, and Ross Cheung. Finally, this work benefited immensely from the comments of the three anonymous reviewers.
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Subject Keywords:Cooling rate, information content, remote sensing
Record Number:CaltechAUTHORS:FELjgrd08a
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Official Citation:Feldman, D. R., K. N. Liou, R. L. Shia, and Y. L. Yung (2008), On the information content of the thermal infrared cooling rate profile from satellite instrument measurements, J. Geophys. Res., 113, D11118, doi:10.1029/2007JD009041.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12646
Deposited By: Archive Administrator
Deposited On:16 Dec 2008 21:00
Last Modified:08 Nov 2021 22:31

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