Ocean stratification and sea-ice cover in Barents and Kara seas modulate sea-air methane flux: satellite data
The diverse range of mechanisms driving the Arctic amplification and global climate are not completely understood and, in particular, the role of the greenhouse gas methane (CH4) in the Arctic warming remains unclear. Strong sources of methane at the ocean seabed in the Barents Sea and other polar r...
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ftarcticportal:oai:generic.eprints.org:2750 2023-12-10T09:39:02+01:00 Ocean stratification and sea-ice cover in Barents and Kara seas modulate sea-air methane flux: satellite data Yurganov, Leonid Carroll, Dustin Pnyushkov, Andrey Polyakov, Igor V Zhang, Hong 2021-06 application/pdf http://library.arcticportal.org/2750/ http://library.arcticportal.org/2750/1/A2102005.pdf en eng Polar Research Institute of China - PRIC http://library.arcticportal.org/2750/1/A2102005.pdf Yurganov, Leonid and Carroll, Dustin and Pnyushkov, Andrey and Polyakov, Igor V and Zhang, Hong (2021) Ocean stratification and sea-ice cover in Barents and Kara seas modulate sea-air methane flux: satellite data. Advances in Polar Science, 32 (2). pp. 118-140. Atmosphere Cryosphere Oceans Article PeerReviewed 2021 ftarcticportal 2023-11-15T23:54:41Z The diverse range of mechanisms driving the Arctic amplification and global climate are not completely understood and, in particular, the role of the greenhouse gas methane (CH4) in the Arctic warming remains unclear. Strong sources of methane at the ocean seabed in the Barents Sea and other polar regions are well documented. Nevertheless, some of those publications suggest that negligible amounts of methane fluxed from the seabed enter the atmosphere, with roughly 90% of the methane consumed by bacteria. Most in situ observations are taken during summer, which is favorable for collecting data but also characterized by a stratified water column. We present perennial observations of three Thermal IR space-borne spectrometers in the Arctic between 2002 and 2020. According to estimates derived from the data synthesis ECCO (Estimating the Circulation and Climate of the Ocean), in the ice-free Barents Sea the stratification in winter weakens after the summer strong stability. The convection, storms, and turbulent diffusion mix the full-depth water column. CH4 excess over a control area in North Atlantic, measured by three sounders, and the oceanic Mixed Layer Depth (MLD) both maximize in winter. A significant seasonal increase of sea-air exchange in ice-free seas is assumed. The amplitude of the seasonal methane cycle for the Kara Sea significantly increased since the beginning of the century. This may be explained by a decline of ice concentration there. The annual CH4 emission from the Arctic seas is estimated as 2/3 of land emission. The Barents/Kara seas contribute between 1/3 and 1/2 into the Arctic seas annual emission. Article in Journal/Newspaper Advances in Polar Science Arctic Barents Sea Kara Sea North Atlantic Polar Science Polar Science Sea ice Arctic Portal Library Arctic Barents Sea Kara Sea |
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Arctic Portal Library |
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language |
English |
topic |
Atmosphere Cryosphere Oceans |
spellingShingle |
Atmosphere Cryosphere Oceans Yurganov, Leonid Carroll, Dustin Pnyushkov, Andrey Polyakov, Igor V Zhang, Hong Ocean stratification and sea-ice cover in Barents and Kara seas modulate sea-air methane flux: satellite data |
topic_facet |
Atmosphere Cryosphere Oceans |
description |
The diverse range of mechanisms driving the Arctic amplification and global climate are not completely understood and, in particular, the role of the greenhouse gas methane (CH4) in the Arctic warming remains unclear. Strong sources of methane at the ocean seabed in the Barents Sea and other polar regions are well documented. Nevertheless, some of those publications suggest that negligible amounts of methane fluxed from the seabed enter the atmosphere, with roughly 90% of the methane consumed by bacteria. Most in situ observations are taken during summer, which is favorable for collecting data but also characterized by a stratified water column. We present perennial observations of three Thermal IR space-borne spectrometers in the Arctic between 2002 and 2020. According to estimates derived from the data synthesis ECCO (Estimating the Circulation and Climate of the Ocean), in the ice-free Barents Sea the stratification in winter weakens after the summer strong stability. The convection, storms, and turbulent diffusion mix the full-depth water column. CH4 excess over a control area in North Atlantic, measured by three sounders, and the oceanic Mixed Layer Depth (MLD) both maximize in winter. A significant seasonal increase of sea-air exchange in ice-free seas is assumed. The amplitude of the seasonal methane cycle for the Kara Sea significantly increased since the beginning of the century. This may be explained by a decline of ice concentration there. The annual CH4 emission from the Arctic seas is estimated as 2/3 of land emission. The Barents/Kara seas contribute between 1/3 and 1/2 into the Arctic seas annual emission. |
format |
Article in Journal/Newspaper |
author |
Yurganov, Leonid Carroll, Dustin Pnyushkov, Andrey Polyakov, Igor V Zhang, Hong |
author_facet |
Yurganov, Leonid Carroll, Dustin Pnyushkov, Andrey Polyakov, Igor V Zhang, Hong |
author_sort |
Yurganov, Leonid |
title |
Ocean stratification and sea-ice cover in Barents and Kara seas modulate sea-air methane flux: satellite data |
title_short |
Ocean stratification and sea-ice cover in Barents and Kara seas modulate sea-air methane flux: satellite data |
title_full |
Ocean stratification and sea-ice cover in Barents and Kara seas modulate sea-air methane flux: satellite data |
title_fullStr |
Ocean stratification and sea-ice cover in Barents and Kara seas modulate sea-air methane flux: satellite data |
title_full_unstemmed |
Ocean stratification and sea-ice cover in Barents and Kara seas modulate sea-air methane flux: satellite data |
title_sort |
ocean stratification and sea-ice cover in barents and kara seas modulate sea-air methane flux: satellite data |
publisher |
Polar Research Institute of China - PRIC |
publishDate |
2021 |
url |
http://library.arcticportal.org/2750/ http://library.arcticportal.org/2750/1/A2102005.pdf |
geographic |
Arctic Barents Sea Kara Sea |
geographic_facet |
Arctic Barents Sea Kara Sea |
genre |
Advances in Polar Science Arctic Barents Sea Kara Sea North Atlantic Polar Science Polar Science Sea ice |
genre_facet |
Advances in Polar Science Arctic Barents Sea Kara Sea North Atlantic Polar Science Polar Science Sea ice |
op_relation |
http://library.arcticportal.org/2750/1/A2102005.pdf Yurganov, Leonid and Carroll, Dustin and Pnyushkov, Andrey and Polyakov, Igor V and Zhang, Hong (2021) Ocean stratification and sea-ice cover in Barents and Kara seas modulate sea-air methane flux: satellite data. Advances in Polar Science, 32 (2). pp. 118-140. |
_version_ |
1784893812955414528 |