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dc.contributor.authorMayyasi, Majd
dc.contributor.authorClarke, J.
dc.contributor.authorBhattacharyya, D.
dc.contributor.authorChaufray, J. Y.
dc.contributor.authorBenna, M.
dc.contributor.authorMahaffy, P.
dc.contributor.authorStone, S.
dc.contributor.authorYelle, R., V
dc.contributor.authorThiemann, E.
dc.contributor.authorChaffin, M.
dc.contributor.authorDeighan, J.
dc.contributor.authorJain, S.
dc.contributor.authorSchneider, N.
dc.contributor.authorJakosky, B.
dc.date.accessioned2019-10-21T19:29:19Z
dc.date.available2019-10-21T19:29:19Z
dc.date.issued2019-03-20
dc.identifier.citationMayyasi, M., Clarke, J., Bhattacharyya, D., Chaufray, J. Y., Benna, M., Mahaffy, P., et al. (2019). Seasonal variability of deuterium in the upper atmosphere of Mars. Journal of Geophysical Research: Space Physics, 124, 2152–2164. https://doi. org/10.1029/2018JA026244en_US
dc.identifier.issn2169-9380
dc.identifier.doi10.1029/2018ja026244
dc.identifier.urihttp://hdl.handle.net/10150/634776
dc.description.abstractMeasurements by multiple Mars Atmosphere and Volatile Evolution mission instruments, obtained between November 2014 and November 2017, are analyzed to produce deuterium properties in the upper atmosphere of Mars. We show here, for the first time, the seasonal distribution and variability of D densities, temperatures, and estimated Jeans escape rates at the exobase (200 km). Within the data constraints, it is found that the variations in D properties are similar for the northern and southern hemispheres, and peak near southern summer solstice. Trends in the D Lyman-alpha brightness, temperature, density, and escape rate are increasing during the beginning of the dust storm season, peak near southern summer solstice, and decrease toward the end of the dust storm season. This suggests that seasonal drivers at Mars cause deuterium in the upper atmosphere to become globally enhanced when Mars is closest to the Sun and during the Martian dust season when water is provided to the upper atmosphere by subsurface, hydrological, and dust storm dynamics. Plain Language Summary Water escape at Mars can be examined by analyzing the properties of present day hydrogen and its isotope deuterium. The ratio of the abundance of these two atoms at the upper atmosphere of Mars can provide limitations to the preferential escape of one over the other and can provide information on the present rate of escape of water from the upper atmosphere. The results from this work can be paired with estimates of what early Mars and the Sun were like in order to provide estimates for the early water content on ancient Mars. In this paper, the most comprehensive set of observations of deuterium from Mars are analyzed, and the resulting properties of deuterium in the upper atmosphere of Mars are presented.en_US
dc.description.sponsorshipNASA [80NSSC18K0266]; NASA from the University of Colorado [1000320450]; program 'Systeme Solaire' of Centre National d'Etudes Spatialesen_US
dc.language.isoenen_US
dc.publisherAMER GEOPHYSICAL UNIONen_US
dc.rightsCopyright © 2019. American Geophysical Union. All Rights Reserved.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectMarsen_US
dc.subjectdeuteriumen_US
dc.subjectvariabilityen_US
dc.subjectwateren_US
dc.titleSeasonal Variability of Deuterium in the Upper Atmosphere of Marsen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, LPLen_US
dc.identifier.journalJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICSen_US
dc.description.note6 month embargo; published online: 20 March 2019en_US
dc.description.collectioninformationThis 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 repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.volume124
dc.source.issue3
dc.source.beginpage2152-2164
refterms.dateFOA2019-09-20T00:00:00Z


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