000004931 001__ 4931
000004931 005__ 20200616050634.0
000004931 0247_ $$2DOI$$a 10.1038/s41586-019-1097-3 
000004931 037__ $$aSCART-2020-0128
000004931 100__ $$aVandaele, Ann Carine
000004931 245__ $$aMartian dust storm impact on atmospheric H2O and D/H observed by ExoMars Trace Gas Orbiter
000004931 260__ $$c2019
000004931 520__ $$aGlobal dust storms on Mars are rare1,2 but can affect the Martian atmosphere for several months. They can cause changes in atmospheric dynamics and inflation of the atmosphere3, primarily owing to solar heating of the dust3. In turn, changes in atmospheric dynamics can affect the distribution of atmospheric water vapour, with potential implications for the atmospheric photochemistry and climate on Mars4. Recent observations of the water vapour abundance in the Martian atmosphere during dust storm conditions revealed a high-altitude increase in atmospheric water vapour that was more pronounced at high northern latitudes5,6, as well as a decrease in the water column at low latitudes7,8. Here we present concurrent, high-resolution measurements of dust, water and semiheavy water (HDO) at the onset of a global dust storm, obtained by the NOMAD and ACS instruments onboard the ExoMars Trace Gas Orbiter. We report the vertical distribution of the HDO/H2O ratio (D/H) from the planetary boundary layer up to an altitude of 80 kilometres. Our findings suggest that before the onset of the dust storm, HDO abundances were reduced to levels below detectability at altitudes above 40 kilometres. This decrease in HDO coincided with the presence of water-ice clouds. During the storm, an increase in the abundance of H2O and HDO was observed at altitudes between 40 and 80 kilometres. We propose that these increased abundances may be the result of warmer temperatures during the dust storm causing stronger atmospheric circulation and preventing ice cloud formation, which may confine water vapour to lower altitudes through gravitational fall and subsequent sublimation of ice crystals3. The observed changes in H2O and HDO abundance occurred within a few days during the development of the dust storm, suggesting a fast impact of dust storms on the Martian atmosphere.
000004931 594__ $$aNO
000004931 700__ $$aKorablev, Oleg
000004931 700__ $$aDaerden, Frank
000004931 700__ $$aAoki, Shohei
000004931 700__ $$aThomas, Ian R.
000004931 700__ $$aAltieri, Francesca
000004931 700__ $$aLopez-Valverde, Miguel
000004931 700__ $$aVillanueva, Geronimo
000004931 700__ $$aLiuzzi, Giuliano
000004931 700__ $$aSmith, Michael D.
000004931 700__ $$aErwin, Justin T.
000004931 700__ $$aTrompet, Loic
000004931 700__ $$aFedorova, Anna A.
000004931 700__ $$aMontmessin, Franck
000004931 700__ $$aTrokhimovskiy, Alexander
000004931 700__ $$aBelyaev, Denis A.
000004931 700__ $$aIgnatiev, Nikolay I.
000004931 700__ $$aLuginin, Mikhail
000004931 700__ $$aOlsen, Kevin S.
000004931 700__ $$aBaggio, Lucio
000004931 700__ $$aAlday, Juan
000004931 700__ $$aBertaux, Jean-Loup
000004931 700__ $$aBetsis, Daria
000004931 700__ $$aBolse, David
000004931 700__ $$aClancy, R. Todd
000004931 700__ $$aCloutis, Edward
000004931 700__ $$aDepiesse, Cedric
000004931 700__ $$aFunke, Bernd
000004931 700__ $$aGarcia-Comas, Maia
000004931 700__ $$aGerard, Jean-Claude
000004931 700__ $$aGiuranna, Marco
000004931 700__ $$aGonzalez-Galindo, Francisco
000004931 700__ $$aGrigoriev, Alexey V.
000004931 700__ $$aIvanov, Yuriy S.
000004931 700__ $$aKaminski, Jacek
000004931 700__ $$aKaratekin, Ozgur
000004931 700__ $$aLefevre, Franck
000004931 700__ $$aLewis, Stephen
000004931 700__ $$aLopez-Puertas, Manuel
000004931 700__ $$aMahieux, Arnaud
000004931 700__ $$aMaslov, Igor
000004931 700__ $$aMason, Jon
000004931 700__ $$aMumma, Michael J.
000004931 700__ $$aNeary, Lori
000004931 700__ $$aNeefs, Eddy
000004931 700__ $$aPatrakeev, Andrey
000004931 700__ $$aPatsaev, Dmitry
000004931 700__ $$aRistic, Bojan
000004931 700__ $$aRobert, Severine
000004931 700__ $$aSchmidt, Frederic
000004931 700__ $$aShakun, Alexey
000004931 700__ $$aTeanby, Nicholas A.
000004931 700__ $$aViscardy, Sebastien
000004931 700__ $$aWillame, Yannick
000004931 700__ $$aWhiteway, James
000004931 700__ $$aWilquet, Valerie
000004931 700__ $$aWolff, Michael J.
000004931 700__ $$aBellucci, Giancarlo
000004931 700__ $$aPatel, Manish R.
000004931 700__ $$aLopez-Moreno, Jose-Juan
000004931 700__ $$aForget, Francois
000004931 700__ $$aWilson, Colin F.
000004931 700__ $$aYoung, Roland
000004931 700__ $$aSvedhem, H√¢kan
000004931 700__ $$aVago, Jorge L.
000004931 700__ $$aRodionov, Daniel
000004931 773__ $$c521-525$$n7753$$p Nature$$v568$$y2019
000004931 8560_ $$fozgur.karatekin@observatoire.be
000004931 85642 $$ahttps://www.nature.com/articles/s41586-019-1097-3
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000004931 905__ $$apublished in
000004931 980__ $$aREFERD