Nadir correction of AIRS radiances
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...
| Main Authors: | , |
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| Format: | Journal Article |
| Language: | English |
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2012
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| Online Access: | https://hdl.handle.net/10356/95459 http://hdl.handle.net/10220/8220 |
| _version_ | 1811690388439695360 |
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| author | Teo, Chee Kiat Koh, Tieh Yong |
| author_facet | Teo, Chee Kiat Koh, Tieh Yong |
| author_sort | Teo, Chee Kiat |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T06:03:12Z |
| format | Journal Article |
| id | ntu-10356/95459 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:03:12Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | ntu-10356/954592020-09-26T21:32:23Z Nadir correction of AIRS radiances Teo, Chee Kiat Koh, Tieh Yong DRNTU::Science::Geology 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. Published version 2012-06-20T07:33:49Z 2019-12-06T19:15:19Z 2012-06-20T07:33:49Z 2019-12-06T19:15:19Z 2010 2010 Journal Article Teo, C. K., & Koh, T. Y. (2010). Nadir Correction of AIRS Radiances. Journal of Atmospheric and Oceanic Technology, 27(3), 470–480. 1520-0426 https://hdl.handle.net/10356/95459 http://hdl.handle.net/10220/8220 10.1175/2009JTECHA1341.1 en Journal of atmospheric and oceanic technology © 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. 12 p. application/pdf |
| spellingShingle | DRNTU::Science::Geology Teo, Chee Kiat Koh, Tieh Yong Nadir correction of AIRS radiances |
| title | Nadir correction of AIRS radiances |
| title_full | Nadir correction of AIRS radiances |
| title_fullStr | Nadir correction of AIRS radiances |
| title_full_unstemmed | Nadir correction of AIRS radiances |
| title_short | Nadir correction of AIRS radiances |
| title_sort | nadir correction of airs radiances |
| topic | DRNTU::Science::Geology |
| url | https://hdl.handle.net/10356/95459 http://hdl.handle.net/10220/8220 |
| work_keys_str_mv | AT teocheekiat nadircorrectionofairsradiances AT kohtiehyong nadircorrectionofairsradiances |