Day-night differences in Mars methane suggest nighttime containment at Gale crater

  title={Day-night differences in Mars methane suggest nighttime containment at Gale crater},
  author={Christopher R. Webster and P. M. Mahaffy and Jorge Pla‐Garc{\'i}a and Scot C. R. Rafkin and John E. Moores and Sushil K. Atreya and Gregory J. Flesch and Charles Malespin and Samuel Teinturier and Hemani Kalucha and Christina L. Smith and Daniel Vi{\'u}dez‐Moreiras and Ashwin R. Vasavada},
  journal={Astronomy \& Astrophysics},
We report new measurements of atmospheric methane by the Curiosity rover’s Tunable Laser Spectrometer that is part of the Sample Analysis at Mars suite (TLS-SAM), finding nondetections during two daytime measurements of average value 0.05 ± 0.22 ppbv (95% confidence interval CI). These are in marked contrast with nighttime background levels of 0.52 ± 0.10 (95% CI) from four measurements taken during the same season of northern summer. This large day-night difference suggests that methane… 

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