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| Titel |
Technical Note: A novel parameterization of the transmissivity due to ozone absorption in the k-distribution method and correlated-k approximation of Kato et al. (1999) over the UV band |
| VerfasserIn |
W. Wandji Nyamsi, A. Arola, P. Blanc, A. V. Lindfors, V. Cesnulyte, M. R. A. Pitkänen, L. Wald |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 13 ; Nr. 15, no. 13 (2015-07-09), S.7449-7456 |
| Datensatznummer |
250119880
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| Publikation (Nr.) |
 copernicus.org/acp-15-7449-2015.pdf |
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| Zusammenfassung |
| The k-distribution method and the correlated-k approximation of Kato
et al. (1999) is a computationally efficient approach originally designed for
calculations of the broadband solar radiation at ground level by dividing
the solar spectrum in 32 specific spectral bands from 240 to 4606 nm.
Compared to a spectrally resolved computation, its performance in the UV
band appears to be inaccurate, especially in the spectral intervals #3
[283, 307] nm and #4 [307, 328] nm because of inaccuracy in modeling the
transmissivity due to ozone absorption. Numerical simulations presented in
this paper indicate that a single effective ozone cross section is
insufficient to accurately represent the transmissivity over each spectral
interval. A novel parameterization of the transmissivity using more
quadrature points yields maximum errors of respectively 0.0006 and 0.0143 for
intervals #3 and #4. How to practically implement this new
parameterization in a radiative transfer model is discussed for the case of
libRadtran (library for radiative transfer). The new parameterization considerably improves the accuracy of
the retrieval of irradiances in UV bands. |
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