000004932 001__ 4932
000004932 005__ 20200616051155.0
000004932 0247_ $$2DOI$$a 10.1038/s41586-019-1096-4 
000004932 037__ $$aSCART-2020-0129
000004932 100__ $$aKorablev, Oleg
000004932 245__ $$aNo detection of methane on Mars from early ExoMars Trace Gas Orbiter observations
000004932 260__ $$c2019
000004932 520__ $$aThe detection of methane on Mars has been interpreted as indicating that geochemical or biotic activities could persist on Mars today1. A number of different measurements of methane show evidence of transient, locally elevated methane concentrations and seasonal variations in background methane concentrations2,3,4,5. These measurements, however, are difficult to reconcile with our current understanding of the chemistry and physics of the Martian atmosphere6,7, which—given methane’s lifetime of several centuries—predicts an even, well mixed distribution of methane1,6,8. Here we report highly sensitive measurements of the atmosphere of Mars in an attempt to detect methane, using the ACS and NOMAD instruments onboard the ESA-Roscosmos ExoMars Trace Gas Orbiter from April to August 2018. We did not detect any methane over a range of latitudes in both hemispheres, obtaining an upper limit for methane of about 0.05 parts per billion by volume, which is 10 to 100 times lower than previously reported positive detections2,4. We suggest that reconciliation between the present findings and the background methane concentrations found in the Gale crater4 would require an unknown process that can rapidly remove or sequester methane from the lower atmosphere before it spreads globally.
000004932 594__ $$aNO
000004932 700__ $$aAvandaele, Ann Carine
000004932 700__ $$aMontmessin, Franck
000004932 700__ $$aFedorova, Anna A.
000004932 700__ $$aTrokhimovskiy, Alexander
000004932 700__ $$aForget, Francois
000004932 700__ $$aLefevre, Franck
000004932 700__ $$aDaerden, Frank
000004932 700__ $$aThomas, Ian R.
000004932 700__ $$aTrompet, Loïc
000004932 700__ $$aErwin, Justin T.
000004932 700__ $$aAoki, Shohei
000004932 700__ $$aRobert, Séverine
000004932 700__ $$aNeary, Lori
000004932 700__ $$aViscardy, Sébastien
000004932 700__ $$aGrigoriev, Alexey V.
000004932 700__ $$aIgnatiev, Nikolay I.
000004932 700__ $$aShakun, Alexey
000004932 700__ $$aPatrakeev, Andrey
000004932 700__ $$aBelyaev, Denis A.
000004932 700__ $$aBertaux, Jean-Loup
000004932 700__ $$aOlsen, Kevin S.
000004932 700__ $$aBaggio, Lucio
000004932 700__ $$aAlday, Juan
000004932 700__ $$aIvanov, Yuriy S.
000004932 700__ $$aRistic, Bojan
000004932 700__ $$aMason, Jon
000004932 700__ $$aWillame, Yannick
000004932 700__ $$aDepiesse, Cedric
000004932 700__ $$aHetey, Laszlo
000004932 700__ $$aBerkenbosch, Sophie
000004932 700__ $$aClairquin, Roland
000004932 700__ $$aQueirolo, Claudio
000004932 700__ $$aBeeckman, Bram
000004932 700__ $$aNeefs, Eddy
000004932 700__ $$aPatel, Manish R.
000004932 700__ $$aBellucci, Giancarlo
000004932 700__ $$aLopez-Moreno, Jose-Juan
000004932 700__ $$aWilson, Colin F.
000004932 700__ $$aEtiope, Giuseppe
000004932 700__ $$aZelenyi, Lev
000004932 700__ $$aSvedhem, Håkan
000004932 700__ $$aVago, Jorge L.
000004932 700__ $$aAlonso-Rodrigo, Gustavo
000004932 700__ $$aAltieri, Francesca
000004932 700__ $$aAnufreychik, Konstantin
000004932 700__ $$aArnold, Gabriele
000004932 700__ $$aBauduin, Sophie
000004932 700__ $$aBolsee, David
000004932 700__ $$aCarrozzo, Giacomo
000004932 700__ $$aClancy, R. Todd
000004932 700__ $$aCloutis, Edward
000004932 700__ $$aCrismani, Matteo
000004932 700__ $$ada Pieve, Fabiana
000004932 700__ $$aD'Aversa, Emiliano
000004932 700__ $$aDuxbury, Natalia
000004932 700__ $$aEncrenaz, Therese
000004932 700__ $$aFouchet, Thierry
000004932 700__ $$aFunke, Bernd
000004932 700__ $$aFussen, Didier
000004932 700__ $$aGarcia-Comas, Maia
000004932 700__ $$aGerard, Jean-Claude
000004932 700__ $$aGiuranna, Marco
000004932 700__ $$aGkouvelis, Leo
000004932 700__ $$aGonzalez-Galindo, Francisco
000004932 700__ $$aGrassi, Davide
000004932 700__ $$aGuerlet, Sandrine
000004932 700__ $$aHartogh, Paul
000004932 700__ $$aHolmes, James
000004932 700__ $$aHubert, Benoît
000004932 700__ $$aKaminski, Jacek
000004932 700__ $$aKaratekin, Ozgur
000004932 700__ $$aKasaba, Yasumasa
000004932 700__ $$aKass, David
000004932 700__ $$aKhatuntsev, Igor
000004932 700__ $$aKleinbehl, Armin
000004932 700__ $$aKokonkov, Nikita
000004932 700__ $$aKrasnopolsky, Vladimir
000004932 700__ $$aKuzmin, Ruslan
000004932 700__ $$aLacombe, Gaétan
000004932 700__ $$aLanciano, Orietta
000004932 700__ $$aLellouch, Emmanuel
000004932 700__ $$aLewis, Stephen
000004932 700__ $$aLuginin, Mikhail
000004932 700__ $$aLiuzzi, Giuliano
000004932 700__ $$aLopez-Puertas, Manuel
000004932 700__ $$aLopez-Valverde, Miguel
000004932 700__ $$aMaattinen, Anni
000004932 700__ $$aMahieux, Arnaud
000004932 700__ $$aMarcq, Emmanuel
000004932 700__ $$aMartin-Torres, Javier
000004932 700__ $$aMaslov, Igor
000004932 700__ $$aMedvedev, Alexander
000004932 700__ $$aMillour, Ehouarn
000004932 700__ $$aMoshkin, Boris
000004932 700__ $$aMumma, Michael J.
000004932 700__ $$aNakagawa, Hiromu
000004932 700__ $$aNovak, Robert E.
000004932 700__ $$aOliva, Fabrizio
000004932 700__ $$aPatsaev, Dmitry
000004932 700__ $$aPiccialli, Arianna
000004932 700__ $$aQuantin-Nataf, Cathy
000004932 700__ $$aRenotte, Etienne
000004932 700__ $$aRitter, Birgit
000004932 700__ $$aRodin, Alexander
000004932 700__ $$aSchmidt, Frédéric
000004932 700__ $$aSchneider, Nick
000004932 700__ $$aShematovich, Valery
000004932 700__ $$aSmith, Michael D.
000004932 700__ $$aTeanby, Nicholas A.
000004932 700__ $$aThiemann, Ed
000004932 700__ $$aThomas, Nicolas
000004932 700__ $$aVander Auwera, Jean
000004932 700__ $$aVazquez, Luis
000004932 700__ $$aVillanueva, Geronimo
000004932 700__ $$aVincendon, Matthieu
000004932 700__ $$aWhiteway, James
000004932 700__ $$aWilquet, Valerie
000004932 700__ $$aWolff, Michael J.
000004932 700__ $$aWolkenberg, Paulina
000004932 700__ $$aYelle, Roger
000004932 700__ $$aYoung, Roland
000004932 700__ $$aZasova, Ludmila
000004932 700__ $$aZorzano, Maria Paz
000004932 773__ $$c517-520$$n7753$$pNature Geoscience$$v568$$y2019
000004932 8560_ $$fozgur.karatekin@observatoire.be
000004932 85642 $$ahttps://www.nature.com/articles/s41586-019-1096-4
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000004932 905__ $$apublished in
000004932 980__ $$aREFERD