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Water on Mars: Isotopic constraints on exchange between the atmosphere and surface

Kass, David M. and Yung, Yuk L. (1999) Water on Mars: Isotopic constraints on exchange between the atmosphere and surface. Geophysical Research Letters, 26 (24). pp. 3653-3656. ISSN 0094-8276. doi:10.1029/1999GL008372. https://resolver.caltech.edu/CaltechAUTHORS:20140827-143313052

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Abstract

Using a new measurement of the D/H fractionation efficiency and new estimates of the water loss, we calculate that Mars has the equivalent of a ∼9 m global water layer in a reservoir that exchanges with the atmosphere. The measured D/H enrichment is about 5 times the terrestrial value, but without exchange, the atmosphere converges on an enrichment of 50 in about 0.5 Ma. Due to the large buffering reservoir and the rapid loss rate (10^(−3) pr-µm yr^(−1)), the small atmospheric reservoir, averaging 10 pr-µm, is unlikely to be in continuous isotopic equilibrium with the full 9 m exchangeable reservoir. Instead, it presumably equilibrates during periods of high obliquity; the atmospheric D/H ratio is expected to be enriched in between such periods. If isotopic exchange with a small (4 mm global layer) reservoir occurs under current conditions, it possible for the atmospheric D/H ratio to be within 10% of its long term equilibrium.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/1999GL008372DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/1999GL008372/abstractPublisherArticle
ORCID:
AuthorORCID
Yung, Yuk L.0000-0002-4263-2562
Additional Information:© 1999 The American Geophysical Union. Received June 4, 1999; Revised July 20, 1999; Accepted September 27, 1999. Paper number 1999GL008372. We thank V. Krasnopolsky for helpful comments. This research was supported by the Astrobiology Institute and NASA grant NAG5-4022 to the California Institute of Technology.
Funders:
Funding AgencyGrant Number
NASA Astrobiology InstituteUNSPECIFIED
NASANAG5-4022
Issue or Number:24
DOI:10.1029/1999GL008372
Record Number:CaltechAUTHORS:20140827-143313052
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140827-143313052
Official Citation:Kass, D. M., & Yung, Y. L. (1999). Water on Mars: Isotopic constraints on exchange between the atmosphere and surface. Geophysical Research Letters, 26(24), 3653-3656. doi: 10.1029/1999gl008372
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49006
Collection:CaltechAUTHORS
Deposited By: Joanne McCole
Deposited On:27 Aug 2014 22:08
Last Modified:10 Nov 2021 18:38

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