Nadir correction of AIRS radiances

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Nadir correction of AIRS radiances

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dc.contributor.author Teo, Chee Kiat
dc.contributor.author Koh, Tieh Yong
dc.date.accessioned 2012-06-20T07:33:49Z
dc.date.available 2012-06-20T07:33:49Z
dc.date.copyright 2010
dc.date.issued 2012-06-20
dc.identifier.citation Teo, C. K., & Koh, T. Y. (2010). Nadir Correction of AIRS Radiances. Journal of Atmospheric and Oceanic Technology, 27(3), 470–480.
dc.identifier.issn 1520-0426
dc.identifier.uri http://hdl.handle.net/10220/8220
dc.description.abstract A statistical method to correct for the limb effect in off-nadir Atmospheric Infrared Sounder (AIRS) channel radiances is described, using the channel radiance itself and principal components (PCs) of the other channel radiances to account for the multicollinearity. A method of selecting an optimal set of predictors is proposed and demonstrated for one- and two-PC predictors. Validation results with a subset of AIRS channels in the spectral region 649–2664 cm−1 show that the mean nadir-corrected brightness temperature (BT) is largely independent of scan angle. More than 66% of the channels have a root-mean-square (rms) bias less than 0.10 K after nadir correction. Limb effect on the standard deviation (SD) of BT is discernible at larger scan angles, mainly for the atmospheric windows and the water vapor channels around 6.7 μm. After nadir correction, nearly all atmospheric window channels unaffected by solar glint and more than 76% of water vapor channels examined have BT SDs brought closer to nadir values. For the window channels affected by solar glint (wavenumber > 2490 cm−1), BT SDs at the scan angles with the strongest impact from solar reflection were improved on average by more than 0.6 K after nadir correction.
dc.format.extent 12 p.
dc.language.iso en
dc.relation.ispartofseries Journal of atmospheric and oceanic technology
dc.rights © 2010 American Meteorological Society. This paper was published in Journal of Atmospheric and Oceanic Technology and is made available as an electronic reprint (preprint) with permission of American Meteorological Society. The paper can be found at DOI:[http://dx.doi.org/10.1175/2009JTECHA1341.1]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
dc.subject DRNTU::Science::Geology.
dc.title Nadir correction of AIRS radiances
dc.type Journal Article
dc.identifier.doi http://dx.doi.org/10.1175/2009JTECHA1341.1
dc.description.version Published version

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