1. By Matthew Polacek

2.  Atmospheric CH 4 on Earth  Biological sources  Methanogens  Abiotic sources  UV degradation  Geothermal Production  Etc.,

3.  Early Measurements  Canada-France-Hawaii telescope  NASA IRTF  PFS MEX  TES  Indications of global averages and localized plumes of methane

4.  Plume findings are questionable  Variability in measurements  Lack of supporting evidence

5.  Increased accuracy of the TLS at SAM on the Curiosity Rover  Two channel tunable laser spectrometer  Channel 1, 2.78 microns  Channel 2, 3.27 microns

6.  Note: 1-sol=24 hours 37.5 minutes  Data from 605 sols  11 direct ingest measurements and 2 methane enrichment experiments  Three groups  Low-methane direct ingest  Low-methane enrichment runs  High-methane direct ingest

8.  Exogenous organics  IDP and comets  Modeling UV/CH 4 conversion rate  2.2 ppbv model vs..7 ppbv actual  High-methane results  No quantitative correlation

10.  Mars methane detection and variability at Gale crater Christopher R. Webster et al. Science 347, 415 (2015); DOI: 10.1126/science.1261713