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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
Format Type: PDF Article :
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
Historic
Publication Date:
2012
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 http://www.ebooklibrary.org/


Description
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.

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

Excerpt
Baran, A.: A review of the light scattering properties of cirrus, J. Quant. Spectrosc. Ra., 110, 1239–1260, 2009.; Choi, Y.-S. and Ho, C.-H., Radiative effect of cirrus with different optical properties over the tropics in MODIS and CERES observations, Geophys. Res. Lett., 33, L21811, doi:10.1029/2006GL027403, 2006.; Chou, M. and Lindzen, R.: Comments on Examination of the Decadal Tropical Mean ERBS Nonscanner Radiation Data for the Iris Hypothesis, J. Climate, 18, 2123–2127, 2005.; Goldblatt, C. and Zahnle, K. J.: Clouds and the Faint Young Sun Paradox, Clim. Past, 7, 203–220, doi:10.5194/cp-7-203-2011, 2011.; Heymsfield, A., Matrosov, S., and Baum, B.: Ice Water Path-Optical Depth Relationships for Cirrus and Deep Stratiform Ice Cloud Layers, J. Appl. Meteorol., 42, 1369–1390, 2003.; Hong, G., Yang, P., Baum, B., Heymsfield, A., and Xu, K.: Parameterization of Shortwave and Longwave Radiative Properties of Ice Clouds for Use in Climate Models, J. Climate, 22, 6287–6312, 2009.; Kahn, B. H., Liang, C. K., Eldering, A., Gettelman, A., Yue, Q., and Liou, K. N.: Tropical thin cirrus and relative humidity observed by the Atmospheric Infrared Sounder, Atmos. Chem. Phys., 8, 1501–1518, doi:10.5194/acp-8-1501-2008, 2008.; Kasting, J., Howard, M., Wallmann, K., Veizer, J., Shields, G., and Jaffr{é}s, J.: Paleoclimates, ocean depth, and the oxygen isotopic composition of seawater, Earth Planet. Sc. Lett., 252, 82–93, 2006.; Knauth, L. and Lowe, D.: High Archean climatic temperature inferred from oxygen isotope geochemistry of cherts in the 3.5 Ga Swaziland Supergroup, South Africa, B. Geol. Soc. Am., 115, 566–580, 2003.; Kubar, T., Hartmann, D., and Wood, R.: Radiative and Convective Driving of Tropical High Clouds, J. Climate, 20, 5510–5526, 2007.; Lindzen, R., Chou, M., and Hou, A.: Comment on No Evidence for Iris, B. Am. Meteorol. Soc., 83, 1345–1349, 2002.; Rondanelli, R. and Lindzen, R.: Can thin cirrus clouds in the tropics provide a solution to the faint young Sun paradox?, J. Geophys. Res., 115, D02108, doi:10.1029/2009JD012050, 2010a.; Rondanelli, R. and Lindzen, R.: Comment on Variations of tropical upper tropospheric clouds with sea surface temperature and implications for radiative effects by H. Su et al., J. Geophys. Res., 115, D06202, doi:10.1029/2008JD011189, 2010b.; Rosing, M., Bird, D., Sleep, N., and Bjerrum, C.: No climate paradox under the faint early Sun, Nature, 464, 744–747, 2010.; Rossow, W., Henderson-Sellers, A., and Weinreich, S.: Cloud Feedback: A Stabilizing Effect for the Early Earth?, Science, 217, 1245–1247, 1982.

 

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