On the use of principal component analysis to speed up radiative transfer calculations

Creators: Natraj, Vijay; Shia, Run-Lie; Yung, Yuk L.

Abstract

Radiative transfer is computationally expensive. However, it is essential to many applications, in particular remote sensing retrievals. Principal component analysis of the optical depth and single scattering albedo profiles has been proposed as a possible method to help ease the computational burden. Here we show how the technique could be applied to a practical problem of CO_2 retrievals from high spectral resolution measurements of reflected sunlight in three near infrared bands. We obtain a speed improvement of more than 50 fold (compared to monochromatic computations), while reproducing the radiances to better than 0.1% accuracy.

Additional Information

© 2010 Elsevier Ltd. Received 21 July 2009; accepted 3 November 2009. Available online 11 November 2009. The research described in this paper was performed for the Orbiting Carbon Observatory Project at the Jet Propulsion Laboratory,California Institute ofT echnology, under contracts with the National Aeronautics and Space Administration. This work was supported in part by NASA Grant NAG1-1806. The authors would like to thank the following people: Denis O'Brien, Igor Polonsky, Chris O'Dell and Adam Cardehen for sharing the ECMWF profiles; Hartmut Boesch for computing the optical property inputs for the RT calculations; Chris O'Dell for the convolution code; Jack Margolis, Mimi Gerstell and Nima Ghaderi for helpful comments on the manuscript.

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On the use of principal component analysis to speed up radiative transfer calculations

Abstract

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