3D Climate Simulations of the Archean Find That Methane has a Strong Cooling Effect at High Concentrations

Author:

Eager‐Nash J. K.1ORCID,Mayne N. J.1ORCID,Nicholson A. E.1,Prins J. E.12,Young O. C. F.1,Daines S. J.3,Sergeev D. E.14ORCID,Lambert F. H.4ORCID,Manners J.15ORCID,Boutle I. A.15ORCID,Wolf E. T.678ORCID,Kamp I. E. E.2,Kohary K.1,Lenton T. M.3

Affiliation:

1. Department of Physics and Astronomy University of Exeter Exeter UK

2. Kapteyn Astronomical Institute University of Groningen Groningen The Netherlands

3. Global Systems Institute University of Exeter Exeter UK

4. Department of Mathematics and Statistics University of Exeter Exeter UK

5. Met Office Exeter UK

6. Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder CO USA

7. NASA NExSS Virtual Planetary Laboratory Seattle WA USA

8. NASA GSFC Sellers Exoplanet Environments Collaboration Greenbelt MD USA

Abstract

AbstractMethane is thought to have been an important greenhouse gas during the Archean, although its potential warming has been found to be limited at high concentrations due to its high shortwave absorption. We use the Met Office Unified Model, a general circulation model, to further explore the climatic effect of different Archean methane concentrations. Surface warming peaks at a pressure ratio pCH4:pCO2 of approximately 0.1, reaching a maximum of up to 7 K before significant cooling above this ratio. Equator‐to‐pole temperature differences also tend to increase up to pCH4 ≤ 300 Pa, which is driven by a difference in radiative forcing at the equator and poles by methane and a reduction in the latitudinal extend of the Hadley circulation. 3D models are important to fully capture the cooling effect of methane, due to these impacts of the circulation.

Publisher

American Geophysical Union (AGU)

Subject

Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Atmospheric Science,Geophysics

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. 3D Simulations of the Archean Earth Including Photochemical Haze Profiles;Journal of Geophysical Research: Atmospheres;2023-10-20

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