Strong Release of Methane on Mars in Northern Summer 2003

@article{Mumma2009StrongRO,
  title={Strong Release of Methane on Mars in Northern Summer 2003},
  author={Michael J. Mumma and Geronimo L. Villanueva and Robert E. Novak and Tilak Hewagama and Boncho P. Bonev and Michael A. DiSanti and Avi M. Mandell and Michael D. Smith},
  journal={Science},
  year={2009},
  volume={323},
  pages={1041 - 1045}
}
Living systems produce more than 90% of Earth's atmospheric methane; the balance is of geochemical origin. On Mars, methane could be a signature of either origin. Using high-dispersion infrared spectrometers at three ground-based telescopes, we measured methane and water vapor simultaneously on Mars over several longitude intervals in northern early and late summer in 2003 and near the vernal equinox in 2006. When present, methane occurred in extended plumes, and the maxima of latitudinal… 
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