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Search: onr:"swepub:oai:lup.lub.lu.se:104b96fa-5ec0-4971-9e67-d52ada045f8f" > A map of D/H on Mar...

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  • Encrenaz, T.LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique (author)

A map of D/H on Mars in the thermal infrared using EXES aboard SOFIA

  • Article/chapterEnglish2016

Publisher, publication year, extent ...

  • 2016-01-26
  • EDP Sciences,2016

Numbers

  • LIBRIS-ID:oai:lup.lub.lu.se:104b96fa-5ec0-4971-9e67-d52ada045f8f
  • https://lup.lub.lu.se/record/104b96fa-5ec0-4971-9e67-d52ada045f8fURI
  • https://doi.org/10.1051/0004-6361/201527018DOI

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  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • On a planetary scale, the D/H ratio on Mars is a key diagnostic for understanding the past history of water on the planet; locally, it can help to constrain the sources and sinks of water vapor through the monitoring of condensation and sublimation processes. To obtain simultaneous measurements of H2O and HDO lines, we have used the Echelle Cross Echelle Spectrograph (EXES) instrument aboard the Stratospheric Observatory for Infrared Astronomy (SOFIA) facility to map the abundances of these two species over the Martian disk. High-resolution spectra (R = 6 × 104) were recorded in the 1383-1390 cm-1 range (7.2 μm) on April 08, 2014. Mars was very close to opposition and near northern summer solstice (Ls = 113°). Maps of the H2O and HDO mixing ratios were retrieved from the line depth ratios of weak H2O and HDO transitions divided by a weak CO2 line. As expected for this season, the H2O and HDO maps show a distinct enhancement toward polar regions, and their mixing ratios are consistent with previous measurements and with predictions by the global climate models, except at the north pole where the EXES values are weaker. We derive a disk-integrated D/H ratio of 6.8 (+1.6, -1.0) × 10-4. It is higher than the value in Earth's oceans by a factor 4.4 (+1.0, -0.6). The D/H map also shows an enhancement from southern to northern latitudes, with values ranging from about 3.5 times to 6.0 times the VSMOW (Vienna standard mean ocean water) value. The D/H distribution shows a depletion over the Tharsis mountains and is consistent with observed latitudinal variations. The variations in D/H with latitude and altitude agree with the models and with the isotope fractionation expected from condensation and sublimation processes.

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  • Dewitt, C.University of California, Davis (author)
  • Richter, M. J.University of California, Davis (author)
  • Greathouse, T. K.Southwest Research Institute (swri), Texas (author)
  • Fouchet, T.LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique (author)
  • Montmessin, F.Institute Pierre Simon Laplace (author)
  • Lefèvre, F.Institute Pierre Simon Laplace (author)
  • Forget, F.Laboratoire de Meteorologie Dynamique (author)
  • Bézard, B.LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique (author)
  • Atreya, S. K.University of Michigan (author)
  • Case, M.University of California, Davis (author)
  • Ryde, N.Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science(Swepub:lu)astr-nlr (author)
  • LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en AstrophysiqueUniversity of California, Davis (creator_code:org_t)

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  • In:Astronomy and Astrophysics: EDP Sciences5860004-63611432-0746

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