Impact of variations of gravitational acceleration on the general circulation of the planetary atmosphere

Kilic, Cevahir; Raible, Christoph; Stocker, Thomas; Kirk, Edilbert (2017). Impact of variations of gravitational acceleration on the general circulation of the planetary atmosphere. Planetary and space science, 135, pp. 1-16. Elsevier 10.1016/j.pss.2016.11.001

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Fundamental to the redistribution of energy in a planetary atmosphere is the general circulation and its meridional structure. We use a general circulation model of the atmosphere in an aquaplanet configuration with prescribed sea surface temperature and investigate the influence of the gravitational acceleration g on the structure of the circulation. For g=g₀=9.81ms⁻², three meridional cells exist in each hemisphere. Up to about g/g₀=1.4 all cells increase in strength. Further increasing this ratio results in a weakening of the thermally indirect cell, such that a two- and finally a one-cell structure of the meridional circulation develops in each hemisphere. This transition is explained by the primary driver of the thermally direct Hadley cell: the diabatic heating at the equator which is proportional to g. The analysis of the energetics of the atmospheric circulation based on the Lorenz energy cycle supports this finding. For Earth-like gravitational accelerations transient eddies are primarily responsible for the meridional heat flux. For large gravitational accelerations, the direct zonal mean conversion of energy dominates the meridional heat flux.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)

UniBE Contributor:

Kilic, Cevahir; Raible, Christoph and Stocker, Thomas

Subjects:

500 Science > 530 Physics
500 Science > 550 Earth sciences & geology

ISSN:

0032-0633

Publisher:

Elsevier

Language:

English

Submitter:

Doris Rätz

Date Deposited:

05 Apr 2017 15:46

Last Modified:

05 Apr 2017 15:46

Publisher DOI:

10.1016/j.pss.2016.11.001

BORIS DOI:

10.7892/boris.92580

URI:

https://boris.unibe.ch/id/eprint/92580

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