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Potential effects of atmospheric collapse on Martian heat flow and application to the InSight measurements

Attree, N. and Patel, N. and Hagermann, Axel and Grott, Matthias and Spohn, Tilman and Siegler, M.A. (2019) Potential effects of atmospheric collapse on Martian heat flow and application to the InSight measurements. Planetary and Space Science. Elsevier. DOI: 10.1016/j.pss.2019.104778 ISSN 0032-0633

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Official URL: https://www.sciencedirect.com/science/article/pii/S003206331930145X#!

Abstract

Heat flow is an important constraint on planetary formation and evolution. It has been suggested that Martian obliquity cycles might cause periodic collapses in atmospheric pressure, leading to corresponding decreases in regolith thermal conductivity (which is controlled by gas in the pore spaces). Geothermal heat would then build up in the subsurface, potentially affecting present–day heat flow — and thus the measurements made by a heat–flow probe such as the InSight HP3 instrument. To gauge the order of magnitude of this effect, we model the diffusion of a putative heat pulse caused by thermal conductivity changes with a simple numerical scheme and compare it to the heat–flow perturbations caused by other effects. We find that an atmospheric collapse to 300 Pa in the last 40 kyr would lead to a present–day heat flow that is up to larger than the average geothermal background. Considering the InSight mission with expected error bars on the HP3 measurement, this perturbation would only be significant in the best-case scenario of full instrument deployment, completed measurement campaign, and a well–modelled surface configuration. The prospects for detecting long-term climate perturbations via spacecraft heat–flow experiments remain challenging.

Item URL in elib:https://elib.dlr.de/130717/
Document Type:Article
Additional Information:Bisher nur online erschienen.
Title:Potential effects of atmospheric collapse on Martian heat flow and application to the InSight measurements
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Attree, N.Aix-Marseille Univ., CNRS, Laboratoire d’Astrophysique de Marseille (LAM), rue Frédéric Juliot-Curie, 13388 Marseille CEDEX 13, FranceUNSPECIFIED
Patel, N.The Open University, Milton Keynes, UKUNSPECIFIED
Hagermann, Axelaxalhagermann (at) stir.ac.ukUNSPECIFIED
Grott, MatthiasMatthias.Grott (at) dlr.deUNSPECIFIED
Spohn, TilmanTilman.Spohn (at) dlr.deUNSPECIFIED
Siegler, M.A.southern methodist university (dallas, tx, 75275-0100)UNSPECIFIED
Date:22 October 2019
Journal or Publication Title:Planetary and Space Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.pss.2019.104778
Publisher:Elsevier
ISSN:0032-0633
Status:Published
Keywords:Mars Interior Climate InSight
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):Project InSight HP3
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Institute of Planetary Research > Planetary Physics
Deposited By: Grott, Dr.rer.nat. Matthias
Deposited On:18 Nov 2019 09:25
Last Modified:18 Nov 2019 09:25

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