Orbital Forcing of Martian Climate Revealed in a South Polar Outlier Ice Deposit
AffiliationLunar and Planetary Laboratory, University of Arizona
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PublisherJohn Wiley and Sons Inc
CitationSori, M. M., Becerra, P., Bapst, J., Byrne, S., & McGlasson, R. A. (2022). Orbital Forcing of Martian Climate Revealed in a South Polar Outlier Ice Deposit. Geophysical Research Letters.
JournalGeophysical Research Letters
RightsCopyright © 2022 The Authors. This is an open access article under the terms of the Creative Commons Attribution License.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractDeciphering paleoclimate on Mars has been a driving goal of Martian science for decades. Most research has addressed this issue by studying Mars' large polar layered deposits (PLDs) as a paleoclimate proxy, but the certainty to which we know the link between climate and orbit is debated. Here, we instead consider the record of other, smaller ice deposits located within craters separated from the PLDs using images from NASA's High Resolution Imaging Science Experiment camera and signal processing techniques. We show that the climate record in Burroughs Crater (72.3°S, 116.6°E) contains robust evidence of orbital forcing, with periodicities that have wavelengths of 15.6 and 6.5 m. The ratio of these dominant wavelengths is 2.4, the same as the ratio between the periods of Mars' obliquity changes and orbital precession. This result suggests orbital control of recent Mars climate, and would imply an average ice accumulation rate of 0.13 mm/yr over 4.5 Myr in this region. © 2022. The Authors.
NoteOpen access article
VersionFinal published version
Except where otherwise noted, this item's license is described as Copyright © 2022 The Authors. This is an open access article under the terms of the Creative Commons Attribution License.