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|a Atmospheric observations of Arctic Occean methane emissions up to 82 degrees north |h [electronic resource]. |
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|a [S.l.] : |b Macmillan Publishers Limited, |c 2012-04-22. |
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|a Nature Geoscience Magazine |b Letters. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a Uncertainty in the future atmospheric burden of methane, a
potent greenhouse gas1, represents an important challenge to
the development of realistic climate projections. The Arctic
is home to large reservoirs of methane, in the form of
permafrost soils and methane hydrates2, which are vulnerable
to destabilization in a warming climate. Furthermore, methane
is produced in the surface ocean3 and the surface waters
of the Arctic Ocean are supersaturated with respect to
methane4,5. However, the fate of this oceanic methane is
uncertain. Here, we use airborne observations of methane
to assess methane efflux from the remote Arctic Ocean,
up to latitudes of 82 [degrees] north. We report layers of increased
methane concentrations near the surface ocean, with little or
no enhancement in carbon monoxide levels, indicative of a
non-combustion source. We further show that high methane
concentrations are restricted to areas over open leads and
regions with fractional sea-ice cover. Based on the observed
gradients in methane concentration, we estimate that sea–
air fluxes amount to around 2mgd-1 m-2, comparable to
emissions seen on the Siberian shelf. We suggest that the
surface waters of the Arctic Ocean represent a potentially
important source of methane, which could prove sensitive to
changes in sea-ice cover. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15052541/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/05/25/41/00001/FI15052541_thm.jpg |
