2007: Methane release and coastal environment in the East Siberian Arctic shelf
In this paper we present 2 years of data obtained during the late summer period (September 2003 and September 2004) for the East Siberian Arctic shelf (ESAS). According to our data, the surface layer of shelf water was supersaturated up to 2500 % relative to the present average atmospheric methane c...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.371.4677 2023-05-15T14:51:55+02:00 2007: Methane release and coastal environment in the East Siberian Arctic shelf N. Shakhova I. Semiletov The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.4677 http://ic.ucsc.edu/~acr/BeringResources/Articles of interest/Eurasian Basin/Shakova and Semiletov 2007.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.4677 http://ic.ucsc.edu/~acr/BeringResources/Articles of interest/Eurasian Basin/Shakova and Semiletov 2007.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://ic.ucsc.edu/~acr/BeringResources/Articles of interest/Eurasian Basin/Shakova and Semiletov 2007.pdf East Siberian Arctic shelf Marine metha text ftciteseerx 2016-01-08T01:19:41Z In this paper we present 2 years of data obtained during the late summer period (September 2003 and September 2004) for the East Siberian Arctic shelf (ESAS). According to our data, the surface layer of shelf water was supersaturated up to 2500 % relative to the present average atmospheric methane content of 1.85 ppm, pointing to the rivers as a strong source of dissolved methane which comes from watersheds which are underlain with permafrost. Anomalously high concentrations (up to 154 nM or 4400% supersaturation) of dissolved methane in the bottom layer of shelf water at a few sites suggest that the bottom layer is somehow affected by near-bottom sources. The net flux of methane from this area of the East Siberian Arctic shelf can reach up to 13.7×10 4 gCH4 km − 2 from plume areas during the period of ice free water, and thus is in the upper range of the estimated global marine methane release. Ongoing environmental change might affect the methane marine cycle since significant changes in the thermal regime of bottom sediments within a few sites were registered. Correlation between calculated methane storage within the water column and both integrated salinity values (r=0.61) and integrated values of dissolved inorganic carbon (DIC) (r=0.62) suggest that higher concentrations of dissolved methane were mostly derived from the marine environment, likely due to in-situ production or release from decaying submarine gas hydrates deposits. The calculated late summer potential methane emissions tend to vary from year to year, reflecting most likely the effect of changing hydrological and meteorological conditions (temperature, wind) on the ESAS rather than riverine export of dissolved methane. We point out additional sources of methane in this region such Text Arctic Ice permafrost Unknown Arctic |
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Open Polar |
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Unknown |
op_collection_id |
ftciteseerx |
language |
English |
topic |
East Siberian Arctic shelf Marine metha |
spellingShingle |
East Siberian Arctic shelf Marine metha N. Shakhova I. Semiletov 2007: Methane release and coastal environment in the East Siberian Arctic shelf |
topic_facet |
East Siberian Arctic shelf Marine metha |
description |
In this paper we present 2 years of data obtained during the late summer period (September 2003 and September 2004) for the East Siberian Arctic shelf (ESAS). According to our data, the surface layer of shelf water was supersaturated up to 2500 % relative to the present average atmospheric methane content of 1.85 ppm, pointing to the rivers as a strong source of dissolved methane which comes from watersheds which are underlain with permafrost. Anomalously high concentrations (up to 154 nM or 4400% supersaturation) of dissolved methane in the bottom layer of shelf water at a few sites suggest that the bottom layer is somehow affected by near-bottom sources. The net flux of methane from this area of the East Siberian Arctic shelf can reach up to 13.7×10 4 gCH4 km − 2 from plume areas during the period of ice free water, and thus is in the upper range of the estimated global marine methane release. Ongoing environmental change might affect the methane marine cycle since significant changes in the thermal regime of bottom sediments within a few sites were registered. Correlation between calculated methane storage within the water column and both integrated salinity values (r=0.61) and integrated values of dissolved inorganic carbon (DIC) (r=0.62) suggest that higher concentrations of dissolved methane were mostly derived from the marine environment, likely due to in-situ production or release from decaying submarine gas hydrates deposits. The calculated late summer potential methane emissions tend to vary from year to year, reflecting most likely the effect of changing hydrological and meteorological conditions (temperature, wind) on the ESAS rather than riverine export of dissolved methane. We point out additional sources of methane in this region such |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
N. Shakhova I. Semiletov |
author_facet |
N. Shakhova I. Semiletov |
author_sort |
N. Shakhova |
title |
2007: Methane release and coastal environment in the East Siberian Arctic shelf |
title_short |
2007: Methane release and coastal environment in the East Siberian Arctic shelf |
title_full |
2007: Methane release and coastal environment in the East Siberian Arctic shelf |
title_fullStr |
2007: Methane release and coastal environment in the East Siberian Arctic shelf |
title_full_unstemmed |
2007: Methane release and coastal environment in the East Siberian Arctic shelf |
title_sort |
2007: methane release and coastal environment in the east siberian arctic shelf |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.4677 http://ic.ucsc.edu/~acr/BeringResources/Articles of interest/Eurasian Basin/Shakova and Semiletov 2007.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice permafrost |
genre_facet |
Arctic Ice permafrost |
op_source |
http://ic.ucsc.edu/~acr/BeringResources/Articles of interest/Eurasian Basin/Shakova and Semiletov 2007.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.4677 http://ic.ucsc.edu/~acr/BeringResources/Articles of interest/Eurasian Basin/Shakova and Semiletov 2007.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766323062227075072 |