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| Titel |
Comment on "Clouds and the Faint Young Sun Paradox" by Goldblatt and Zahnle (2011) |
| VerfasserIn |
R. Rondanelli, R. S. Lindzen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 8, no. 2 ; Nr. 8, no. 2 (2012-03-30), S.701-703 |
| Datensatznummer |
250005478
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| Publikation (Nr.) |
 copernicus.org/cp-8-701-2012.pdf |
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| Zusammenfassung |
| Goldblatt and Zahnle (2011) raise a number of issues related to the possibility that
cirrus clouds can provide a solution to the faint young sun paradox. Here, we
argue that: (1) climates having a lower than present mean surface temperature
cannot be discarded as solutions to the faint young sun paradox, (2) the
detrainment from deep convective clouds in the tropics is a well-established
physical mechanism for the formation of high clouds that have a positive
radiative forcing (even if the possible role of these clouds as a negative
climate feedback remains controversial) and (3) even if some cloud properties
are not mutually consistent with observations in radiative transfer
parameterizations, the most relevant consistency (for the purpose of
hypothesis testing) is with observations of the cloud radiative forcing.
Therefore, we maintain that cirrus clouds, as observed in the current climate
and covering a large region of the tropics, can provide a solution to the
faint young sun paradox, or at least ease the amount of CO2 or other
greenhouse substances needed to provide temperatures above freezing during
the Archean. |
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