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A comparison of CO2 seasonal activity in Mars' northern and southern hemispheres

Hansen, Candice and Byrne, S. and Calvin, W. and Diniega, S. and Dundas, Colin M. and Hayne, Paul and McEwen, A. and Piqueux, S. and Portyankina, Ganna and Schwamb, Megan and Titus, T. and Widmer, J.M. (2023) A comparison of CO2 seasonal activity in Mars' northern and southern hemispheres. Icarus. Elsevier. doi: 10.1016/j.icarus.2023.115801. ISSN 0019-1035.

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Official URL: https://www.sciencedirect.com/science/article/pii/S0019103523003809


Carbon dioxide is Mars' most active volatile. The seasonal and diurnal processes of when and where it condenses and sublimates are determined by energy balance between the atmosphere and surface ice in Mars' vapor pressure equilibrium climate. Mars' current obliquity ensures that the polar caps are stable locations for seasonal condensation. The eccentricity of Mars' orbit is the major driver of differences in seasonal behavior of CO2 between the northern vs southern hemisphere. In particular, the current positions of perihelion and aphelion, in addition to the large elevation difference between the poles, dominate the ways seasonal processes transpire in the two hemispheres. We summarize and discuss the unprecedented observations of these processes that have been collected by the Mars Reconnaissance Orbiter over the last 8.5 Mars Years. The longer southern fall and winter allows more time for CO2 ice to accumulate and densify in the southern hemisphere. Northern winter coincides with the perihelion dust storm season, thus the north polar seasonal ice deposits are expected to contain a greater concentration of dust in relation to CO2 and H2O ices. With less time for densification and more contaminants the northern seasonal layer of CO2 ice is likely weaker than the southern layer.

Item URL in elib:https://elib.dlr.de/202215/
Document Type:Article
Title:A comparison of CO2 seasonal activity in Mars' northern and southern hemispheres
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Byrne, S.Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USAUNSPECIFIEDUNSPECIFIED
Calvin, W.University of Nevada, Reno, Reno, Nevada 89557UNSPECIFIEDUNSPECIFIED
Diniega, S.JPL, California Institute of Technology, Pasadena, CA, USAUNSPECIFIEDUNSPECIFIED
Dundas, Colin M.US Geological Survey, Flagstaff, AZ, USAUNSPECIFIEDUNSPECIFIED
Hayne, PaulLaboratory for Atmospheric & Space Physics, and Astrophysical & Planetary Sciences Department, University of Colorado, Boulder, CO, USAUNSPECIFIEDUNSPECIFIED
McEwen, A.Univ. of Arizona, Tucson, AZUNSPECIFIEDUNSPECIFIED
Piqueux, S.Jet Propulsion Laboratory, California Institute of Technology (Pasadena, CA, 91109)UNSPECIFIEDUNSPECIFIED
Portyankina, GannaUNSPECIFIEDhttps://orcid.org/0000-0002-1323-8195151059964
Schwamb, MeganQueen's University Belfast, Belfast BT7 1NN, UKUNSPECIFIEDUNSPECIFIED
Titus, T.US Geological Survey, Flagstaff, AZ, USAUNSPECIFIEDUNSPECIFIED
Widmer, J.M.University of California, Los Angeles, CA, United States of AmericaUNSPECIFIEDUNSPECIFIED
Date:19 September 2023
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Mars' seasons Mars' CO2 ice Mars climate
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - ExoMars PanCam / MARS2020
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Portyankina, Ganna
Deposited On:19 Jan 2024 08:13
Last Modified:29 Jan 2024 12:39

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