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NASA NTRS · 20140002066

Using Principal Component Analysis (PCA) to Speed up Radiative Transfer (RT) Computations

Natraj, Vijay
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Abstract

Multiple scattering RT calculations time-consuming. Need a speed improvement of about 1000 (for OCO)! Solution: Make use of redundancies in spectra. Correlated-k (Lacis and Wang, Lacis and Oinas, Goody et al, Fu and Liou) Problem: Assume that spectral variation of atmospheric optical properties spatially correlated at all points along optical path. High accuracy (HI) and 2-stream (2S) calculations have high correlation. Single scattering (SS) computations highly scenario-dependent, but not time consuming. Perform SS and 2S calculations at every wavelength. Perform small number of HI computations. Need to compute correction factor B at every wavelength.

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BibTeXRIS

Natraj, Vijay. 2012-07-17. Using Principal Component Analysis (PCA) to Speed up Radiative Transfer (RT) Computations. https://ntrs.nasa.gov/citations/20140002066

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