A topographically forced asymmetry in the martian circulation and climate

Nature
Mark I Richardson, R John Wilson

Abstract

Large seasonal and hemispheric asymmetries in the martian climate system are generally ascribed to variations in solar heating associated with orbital eccentricity. As the orbital elements slowly change (over a period of >104 years), characteristics of the climate such as dustiness and the vigour of atmospheric circulation are thought to vary, as should asymmetries in the climate (for example, the deposition of water ice at the northern versus the southern pole). Such orbitally driven climate change might be responsible for the observed layering in Mars' polar deposits by modulating deposition of dust and water ice. Most current theories assume that climate asymmetries completely reverse as the angular distance between equinox and perihelion changes by 180 degrees. Here we describe a major climate mechanism that will not precess in this way. We show that Mars' global north-south elevation difference forces a dominant southern summer Hadley circulation that is independent of perihelion timing. The Hadley circulation, a tropical overturning cell responsible for trade winds, largely controls interhemispheric transport of water and the bulk dustiness of the atmosphere. The topography therefore imprints a strong handedness on climat...Continue Reading

References

May 11, 1973·Science·B C MurrayS C Yeung

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Citations

Sep 28, 2002·Nature·Jacques LaskarJohn F Mustard
Oct 1, 2011·Science·Nicholas G Heavens
Mar 22, 2002·Nature·Peter Gierasch
Nov 5, 2015·Reports on Progress in Physics·P L ReadD P Mulholland
Sep 11, 2020·Journal of Geophysical Research. Planets·Nicholas G HeavensJames H Shirley
Feb 16, 2021·Space Science Reviews·C E NewmanJ A Rodriguez-Manfredi

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