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Seasonal Variations...
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G. Trainer, MelissaNASA Goddard Space Flight Center, Greenbelt, MD, USA
(författare)
Seasonal Variations in Atmospheric Composition as Measured in Gale Crater, Mars
- Artikel/kapitelEngelska2019
Förlag, utgivningsår, omfång ...
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John Wiley & Sons,2019
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printrdacarrier
Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:ltu-76919
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https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76919URI
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https://doi.org/10.1029/2019JE006175DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
Anmärkningar
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Validerad;2020;Nivå 2;2020-01-29 (johcin)
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The Sample Analysis at Mars (SAM) instrument onboard the Mars Science Laboratory Curiosity rover measures the chemical composition of major atmospheric species (CO2, N2, 40Ar, O2, and CO) through a dedicated atmospheric inlet. We report here measurements of volume mixing ratios in Gale Crater using the SAM quadrupole mass spectrometer, obtained over a period of nearly 5 years (3 Mars years) from landing. The observation period spans the northern summer of MY 31 and solar longitude (LS) of 175° through spring of MY 34, LS = 12°. This work expands upon prior reports of the mixing ratios measured by SAM QMS in the first 105 sols of the mission. The SAM QMS atmospheric measurements were taken periodically, with a cumulative coverage of four or five experiments per season on Mars. Major observations include the seasonal cycle of CO2, N2, and Ar, which lags approximately 20–40° of LS behind the pressure cycle driven by CO2 condensation and sublimation from the winter poles. This seasonal cycle indicates that transport occurs on faster timescales than mixing. The mixing ratio of O2 shows significant seasonal and interannual variability, suggesting an unknown atmospheric or surface process at work. The O2 measurements are compared to several parameters, including dust optical depth and trace CH4 measurements by Curiosity. We derive annual mean volume mixing ratios for the atmosphere in Gale Crater: CO2 = 0.951 (±0.003), N2 = 0.0259 (±0.0006), 40Ar = 0.0194 (±0.0004), O2 = 1.61 (±0.09) x 10‐3, and CO = 5.8 (±0.8) x 10‐4.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Wong, Michael H.Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, USA
(författare)
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McConnochie, Timothy H.University of Maryland, College Park, MD, USA
(författare)
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Franz, Heather B.NASA Goddard Space Flight Center, Greenbelt, MD, USA
(författare)
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Atreya, Sushil K.Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, USA
(författare)
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Conrad, Pamela G.Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, USA
(författare)
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Lefèvre, FranckLATMOS, CNRS, Sorbonne Université, UVSQ, Paris, France
(författare)
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Mahaffy, Paul R.NASA Goddard Space Flight Center, Greenbelt, MD, USA
(författare)
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Malespin, Charles A.NASA Goddard Space Flight Center, Greenbelt, MD, USA
(författare)
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Manning, Heidi L.K.College of Arts and Sciences, Misericordia University, Dallas, PA, USA
(författare)
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Martin-Torres, JavierLuleå tekniska universitet,Rymdteknik,Instituto Andaluz de Ciencias de la Tierra (CSIC‐UGR), Granada, Spain(Swepub:ltu)javmar
(författare)
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Martínez, Germán M.Lunar and Planetary Institute, Universities Space Research Association, Houston, TX, USA. Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, USA
(författare)
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McKay, Christopher P.NASA Ames Research Center, Moffett Field, CA, USA
(författare)
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Navarro‐González, RafaelInstituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
(författare)
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Retortillo, Álvaro VicenteClimate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, USA
(författare)
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Webster, Christopher R.NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
(författare)
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Zorzano Mier, María-PazLuleå tekniska universitet,Rymdteknik,Centro de Astrobiología (INTA‐CSIC), Torrejón de Ardoz, Madrid, Spain(Swepub:ltu)marzor
(författare)
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NASA Goddard Space Flight Center, Greenbelt, MD, USAClimate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, USA
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Journal of Geophysical Research - Planets: John Wiley & Sons124:11, s. 3000-30242169-90972169-9100
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G. Trainer, Meli ...
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Wong, Michael H.
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McConnochie, Tim ...
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Franz, Heather B ...
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Atreya, Sushil K ...
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Conrad, Pamela G ...
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Lefèvre, Franck
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Mahaffy, Paul R.
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Malespin, Charle ...
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Manning, Heidi L ...
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Martin-Torres, J ...
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Martínez, Germán ...
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McKay, Christoph ...
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Navarro‐González ...
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Retortillo, Álva ...
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Webster, Christo ...
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Zorzano Mier, Ma ...
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