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Comment on Clouds and the Faint Young Sun Paradox by Goldblatt and Zahnle (2011) : Volume 8, Issue 2 (30/03/2012)

By Rondanelli, R.

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Book Id: WPLBN0004006442
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File Size: Pages 3
Reproduction Date: 2015

Title: Comment on Clouds and the Faint Young Sun Paradox by Goldblatt and Zahnle (2011) : Volume 8, Issue 2 (30/03/2012)  
Author: Rondanelli, R.
Volume: Vol. 8, Issue 2
Language: English
Subject: Science, Climate, Past
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Rondanelli, R., & Lindzen, R. S. (2012). Comment on Clouds and the Faint Young Sun Paradox by Goldblatt and Zahnle (2011) : Volume 8, Issue 2 (30/03/2012). Retrieved from

Description: Department of Geophysics, University of Chile, Santiago, Chile. 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.

Comment on Clouds and the Faint Young Sun Paradox by Goldblatt and Zahnle (2011)

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