Effects of doubled CO2 on tropical sea surface temperatures (SSTs) for onset of deep convection and maximum SST: Simulations based inferences

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https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2008GL033872

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https://doi.org/10.1029/2008GL033872
 http://hdl.handle.net/11603/25108

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UMBC Joint Center for Earth Systems Technology (JCET)
UMBC Faculty Collection

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Author/Creator ORCID

https://orcid.org/0000-0002-7812-851X

Date

2008-06-24

Type of Work

journal articles
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Citation of Original Publication

Sud, Y. C., G. K. Walker, Y. P. Zhou,G. A. Schmidt, K.-M. Lau, and R. F. Cahalan (2008), Effects ofdoubled CO2on tropical sea surface temperatures (SSTs) for onsetof deep convection and maximum SST: Simulations basedinferences,Geophys. Res. Lett.,35, L12707, doi:10.1029/2008GL033872

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

A primary concern of CO2-induced warming is the associated rise of tropical (10S-10N) sea-surface temperatures (SSTs). GISS Model-E was used to produce two sets of simulations-one with the present-day and one with doubled CO2 in the atmosphere. The intrinsic usefulness of model guidance in the tropics was confirmed when the model simulated realistic convective coupling between SSTs and atmospheric soundings and that the simulated-data correlations between SSTs and 300 hPa moist-static energies were similar to the observed. Model predicted SST limits for (i) the onset of deep convection and (ii) maximum SST, increased in the doubled CO2 environment. Changes in cloud heights, cloud frequencies, and cloud mass-fractions showed that convective-cloud changes increased the SSTs, while warmer mixed-layer of the doubled CO2 contained ∼10% more water vapor; clearly that would be conducive to more intense storms and hurricanes.