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| Titel |
Impact of different definitions of clear-sky flux on the determination of longwave cloud radiative forcing: NICAM simulation results |
| VerfasserIn |
B. J. Sohn, T. Nakajima, M. Satoh, H.-S. Jang |
| 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 ; 10, no. 23 ; Nr. 10, no. 23 (2010-12-08), S.11641-11646 |
| Datensatznummer |
250008945
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| Publikation (Nr.) |
 copernicus.org/acp-10-11641-2010.pdf |
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| Zusammenfassung |
| Using one month of the cloud-resolving Nonhydrostatic Icosahedral
Atmospheric Model (NICAM) simulations, we examined the impact of different
definitions of clear-sky flux on the determination of longwave cloud
radiative forcing (CRF). Because the satellite-like cloud-free composite
preferentially samples drier conditions relative to the all-sky mean state,
the conventional clear-sky flux calculation using the all-sky mean state in
the model may represent a more humid atmospheric state in comparison to the
cloud-free state. The drier bias is evident for the cloud-free composite in
the NICAM simulations, causing an overestimation of the longwave CRF by
about 10% compared to the NICAM simulated longwave CRF. Overall, water
vapor contributions of up to 10% of the total longwave CRF should be
taken account for making model-generated cloud forcing comparable to the
satellite measurements. |
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