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Background levels of methane in Mars' atmosphere show strong seasonal variations.
Webster, Christopher R; Mahaffy, Paul R; Atreya, Sushil K; Moores, John E; Flesch, Gregory J; Malespin, Charles; McKay, Christopher P; Martinez, German; Smith, Christina L; Martin-Torres, Javier; Gomez-Elvira, Javier; Zorzano, Maria-Paz; Wong, Michael H; Trainer, Melissa G; Steele, Andrew; Archer, Doug; Sutter, Brad; Coll, Patrice J; Freissinet, Caroline; Meslin, Pierre-Yves; Gough, Raina V; House, Christopher H; Pavlov, Alexander; Eigenbrode, Jennifer L; Glavin, Daniel P; Pearson, John C; Keymeulen, Didier; Christensen, Lance E; Schwenzer, Susanne P; Navarro-Gonzalez, Rafael; Pla-García, Jorge; Rafkin, Scot C R; Vicente-Retortillo, Álvaro; Kahanpää, Henrik; Viudez-Moreiras, Daniel; Smith, Michael D; Harri, Ari-Matti; Genzer, Maria; Hassler, Donald M; Lemmon, Mark; Crisp, Joy; Sander, Stanley P; Zurek, Richard W; Vasavada, Ashwin R.
Afiliación
  • Webster CR; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA. chris.r.webster@jpl.nasa.gov.
  • Mahaffy PR; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Atreya SK; Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, USA.
  • Moores JE; Department of Earth and Space Science and Engineering, York University, Toronto, ON, Canada.
  • Flesch GJ; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Malespin C; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • McKay CP; NASA Ames Research Center, Moffett Field, CA, USA.
  • Martinez G; Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, USA.
  • Smith CL; Department of Earth and Space Science and Engineering, York University, Toronto, ON, Canada.
  • Martin-Torres J; Department of Computer Science, Electrical and Space Engineering, Luleå University of Technology, Luleå, Sweden.
  • Gomez-Elvira J; Instituto Andaluz de Ciencias de la Tierra, Granada, Spain.
  • Zorzano MP; Centro de Astrobiología, Instituto National de Tecnica Aerospacial, Madrid, Spain.
  • Wong MH; Department of Computer Science, Electrical and Space Engineering, Luleå University of Technology, Luleå, Sweden.
  • Trainer MG; Centro de Astrobiología, Instituto National de Tecnica Aerospacial, Madrid, Spain.
  • Steele A; Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, USA.
  • Archer D; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Sutter B; Geophysical Laboratory, Carnegie Institution for Science, Washington, DC, USA.
  • Coll PJ; Jacobs Technology, NASA Johnson Space Center, Houston, TX, USA.
  • Freissinet C; Jacobs Technology, NASA Johnson Space Center, Houston, TX, USA.
  • Meslin PY; Laboratoire Interuniversitaire des Systèmes Atmosphériques, Creteil Cedex, France.
  • Gough RV; Laboratoire Atmosphères, Milieux, Observations Spatiales, Paris Cedex 05, France.
  • House CH; Institut de Recherche en Astrophysique et Planétologie, Toulouse, France.
  • Pavlov A; Department of Chemistry and Biochemistry and Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA.
  • Eigenbrode JL; Department of Geosciences, Pennsylvania State University, University Park, PA, USA.
  • Glavin DP; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Pearson JC; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Keymeulen D; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Christensen LE; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Schwenzer SP; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Navarro-Gonzalez R; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
  • Pla-García J; School of Environment, Earth and Ecosystem Sciences, Open University, Milton Keynes, UK.
  • Rafkin SCR; Instituto de Ciencias Nucleares, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, Mexico City, Mexico.
  • Vicente-Retortillo Á; Centro de Astrobiología, Instituto National de Tecnica Aerospacial, Madrid, Spain.
  • Kahanpää H; Space Science Institute, Boulder, CO, USA.
  • Viudez-Moreiras D; Department of Space Studies, Southwest Research Institute Boulder, Boulder, CO, USA.
  • Smith MD; Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, USA.
  • Harri AM; Finnish Meteorological Institute, Helsinki, Finland.
  • Genzer M; Centro de Astrobiología, Instituto National de Tecnica Aerospacial, Madrid, Spain.
  • Hassler DM; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Lemmon M; Finnish Meteorological Institute, Helsinki, Finland.
  • Crisp J; Finnish Meteorological Institute, Helsinki, Finland.
  • Sander SP; Department of Space Studies, Southwest Research Institute Boulder, Boulder, CO, USA.
  • Zurek RW; Department of Atmospheric Sciences, Texas A&M University, College Station, TX, USA.
  • Vasavada AR; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
Science ; 360(6393): 1093-1096, 2018 06 08.
Article en En | MEDLINE | ID: mdl-29880682
ABSTRACT
Variable levels of methane in the martian atmosphere have eluded explanation partly because the measurements are not repeatable in time or location. We report in situ measurements at Gale crater made over a 5-year period by the Tunable Laser Spectrometer on the Curiosity rover. The background levels of methane have a mean value 0.41 ± 0.16 parts per billion by volume (ppbv) (95% confidence interval) and exhibit a strong, repeatable seasonal variation (0.24 to 0.65 ppbv). This variation is greater than that predicted from either ultraviolet degradation of impact-delivered organics on the surface or from the annual surface pressure cycle. The large seasonal variation in the background and occurrences of higher temporary spikes (~7 ppbv) are consistent with small localized sources of methane released from martian surface or subsurface reservoirs.
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Texto completo: 1 Banco de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Science Año: 2018 Tipo del documento: Article País de afiliación: Estados Unidos
Texto completo
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Texto completo: 1 Banco de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Science Año: 2018 Tipo del documento: Article País de afiliación: Estados Unidos