Wintertime Methane Emission From the Barents and Kara Seas and Sea of Okhotsk: Satellite Evidence.

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dc.contributor.authorYurganov, Leonid
dc.contributor.authorCarroll, Dustin
dc.contributor.authorPnyushkov, Andrey
dc.contributor.authorPolyakov, Igor
dc.contributor.authorZhang, Hong
dc.date.accessioned2021-04-30T19:25:25Z
dc.date.available2021-04-30T19:25:25Z
dc.descriptionEGU General Assembly 2021, EGU21-5628, vEGU21: Gather Online,19–30 April 2021en_US
dc.description.abstractExistence of strong seabed sources of methane, including gas hydrates, in the Arctic and sub-Arctic seas with proven oil/gas deposits is well documented. Enhanced concentrations of dissolved methane in deep layers are widely observed. Many of marine sources are highly sensitive to climate change; however, the Arctic methane sea-to-air flux remains poorly understood: harsh natural conditions prevent in-situ measurements during winter. Satellite remote sensing, based on terrestrial outgoing Thermal IR radiation measurements, provides a novel alternative to those efforts. We present year-round methane data from 3 orbital sounders since 2002. Those data confirm that negligible amounts of methane are fluxed from the seabed to the atmosphere during summer. In summer, the water column is strongly stratified from sea-ice melt and solar warming. As a result, ~90% of dissolved methane is oxidized by bacteria. Conversely, some marine areas are characterized by positive atmospheric methane anomalies that begin in November. During winter, ocean stratification weakens, convection and winter storms mix the water column efficiently. We also find that the amplitudes of the seasonal cycles over Kara and Okhotsk Seas have increased during last 18 years due to winter concentration growth. There may be several factors responsible for sea-air flux: growing emission from clathrates due to warming, changes in methane transport from the seabed to the surface, changes in microbial oxidation, ice cover, etc. Finally, methane remote sensing results are compared to available observations of temperature in deep ocean layers, estimates of Mixed Layer Depth, and satellite microwave sea-ice cover measurements.en_US
dc.description.urihttps://meetingorganizer.copernicus.org/EGU21/EGU21-5628.htmlen_US
dc.format.extent1 pageen_US
dc.genreconference papers and proceedingsen_US
dc.identifierdoi:10.13016/m26jjd-gnu9
dc.identifier.citationYurganov, L., Carroll, D., Pnyushkov, A., Polyakov, I., and Zhang, H.: Wintertime Methane Emission From the Barents and Kara Seas and Sea of Okhotsk: Satellite Evidence., EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-5628, https://doi.org/10.5194/egusphere-egu21-5628, 2021.en_US
dc.identifier.urihttps://doi.org/10.5194/egusphere-egu21-5628
dc.identifier.urihttp://hdl.handle.net/11603/21422
dc.language.isoen_USen_US
dc.publisherCopernicus Publicationsen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsAttribution 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/us/*
dc.titleWintertime Methane Emission From the Barents and Kara Seas and Sea of Okhotsk: Satellite Evidence.en_US
dc.typeTexten_US

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