large seasonal variations in Martian methane detected
(too old to reply)
2018-06-08 01:40:57 UTC

Background levels of methane in Mars' atmosphere show strong seasonal

Christopher R. Webster, Paul R. Mahaffy, Sushil K. Atreya,
John E. Moores, Gregory J. Flesch, Charles Malespin,
Christopher P. McKay, German Martinez, Christina L. Smith,
Javier Martin-Torres, Javier Gomez-Elvira, Maria-Paz Zorzano,
Michael H. Wong, Melissa G. Trainer, Andrew Steele,
Doug Archer Jr., Brad Sutter, Patrice J. Coll,
Caroline Freissinet, Pierre-Yves Meslin, Raina V. Gough,
Christopher H. House, Alexander Pavlov, Jennifer L. Eigenbrode,
Daniel P. Glavin, John C. Pearson, Didier Keymeulen,
Lance E. Christensen, Susanne P. Schwenzer, Rafael Navarro-Gonzalez,
Jorge Pla-García, Scot C. R. Rafkin, Álvaro Vicente-Retortillo,
Henrik Kahanpää, Daniel Viudez-Moreiras, Michael D. Smith,
Ari-Matti Harri, Maria Genzer, Donald M. Hassler,
Mark Lemmon, Joy Crisp, Stanley P. Sander,
Richard W. Zurek, Ashwin R. Vasavada

Science 08 Jun 2018:
Vol. 360, Issue 6393, pp. 1093-1096
DOI: 10.1126/science.aaq0131


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 bn 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.

Methane is produced in Earth's atmosphere predominantly through
biological processes (1, 2). Its existence in an oxidizing atmosphere
such as Mars' is recognized as a potential biosignature whose putative
sources could include methanogenic bacteria (1, 3, 4). Alternative
nonbiological methane production mechanisms include geological
processes such as serpentinization of olivine or pyroxene (5),
ultraviolet (UV) degradation of indigenous or meteoritically delivered
organics (6, 7), formation by the impact of comets (8), release from
subsurface clathrates (9) or gas absorbed in the regolith (10, 11),
erosion of basalt with methane inclusions (12), or geothermal
processes (13). As a strong greenhouse gas, methane bursts on early
Mars may have been responsible for intermittent lake-forming
climates-a process which could be ongoing today (14).


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<Loading Image...
Due to higher costs, coal and even gas are being utilized less and less in
favor of lower priced and less polluting renewables.
Image source: Think Progress and Bloomberg New Energy Finance.

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Paul Aubrin
2018-06-08 06:39:09 UTC
Post by M***@kymhorsell.com
Background levels of methane in Mars' atmosphere show strong seasonal
Methane? With their atmosphere almost 100% CO2 and that dirty fossil fuel
methane, Martians are soon going to fry. After all, life there expects an
average temperature of 210K (-63°C), if it exists. Like here, an increase
of a few degrees would surely be unsupportable there.
JTEM is right
2018-06-08 07:25:40 UTC
Post by Paul Aubrin
Post by M***@kymhorsell.com
Background levels of methane in Mars' atmosphere show strong seasonal
Methane? With their atmosphere almost 100% CO2 and that dirty fossil fuel
methane, Martians are soon going to fry. After all, life there expects an
average temperature of 210K (-63°C), if it exists. Like here, an increase
of a few degrees would surely be unsupportable there.
Oddly, this is *Years* old information. Methane in
the Martian atmosphere, and even the seasonal
variation, have been talked about for a very long

Here's a 14 y.o. paper:


My point here is that the mainstream media
simply does not "Do" science. Period. The
bullshit is not limited to the climate.

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