Shelf-Basin interaction along the East Siberian Sea
Extensive biogeochemical transformation of organic matter takes place in the shallow continental shelf seas of Siberia. This, in combination with brine production from sea-ice formation, results in cold bottom waters with relatively high salinity and nutrient concentrations, as well as low oxygen an...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Karlstads universitet, Avdelningen för energi-, miljö- och byggteknik
2017
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-65519 https://doi.org/10.5194/os-13-349-2017 |
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ftkarlstadsuniv:oai:DiVA.org:kau-65519 2023-07-16T03:57:59+02:00 Shelf-Basin interaction along the East Siberian Sea Anderson, Leif G. Björk, Göran Holby, Ola Jutterstrom, Sara Morth, Carl Magnus O'Regan, Matt Pearce, Christof Semiletov, Igor Stranne, Christian Stoven, Tim Tanhua, Toste Ulfsbo, Adam Jakobsson, Martin 2017 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-65519 https://doi.org/10.5194/os-13-349-2017 eng eng Karlstads universitet, Avdelningen för energi-, miljö- och byggteknik Univ Gothenburg, Dept Marine Sci, POB 461, S-40530 Gothenburg, Sweden. IVL Swedish Environm Res Inst, Box 530 21, S-40014 Gothenburg, Sweden. Stockholm Univ, Dept Geol Sci, S-10691 Stockholm, Sweden. Stockholm Univ, Dept Geol Sci, S-10691 Stockholm, Sweden.;Aarhus Univ, Dept Geosci, Aarhus, Denmark. Univ Alaska Fairbanks, Int Arctic Res Ctr, Fairbanks, AK 99775 USA.;Russian Acad Sci, Far Eastern Branch, Pacific Oceanol Inst, Vladivostok 690041, Russia.;Natl Res Tomsk Polytech Univ, Tomsk, Russia. Ctr Coastal & Ocean Mapping, Joint Hydrog Ctr, Durham, NH 03824 USA. GEOMAR, Helmholtz Ctr Ocean Res Kiel, Kiel, Germany. Univ Gothenburg, Dept Marine Sci, POB 461, S-40530 Gothenburg, Sweden.;Duke Univ, Nicholas Sch Environm, Div Earth & Ocean Sci, Durham, NC 27704 USA. Copernicus MBH Ocean Science, 1812-0784, 2017, 13:2, s. 349-363 http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-65519 doi:10.5194/os-13-349-2017 ISI:000400167800001 info:eu-repo/semantics/openAccess Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser Article in journal info:eu-repo/semantics/article text 2017 ftkarlstadsuniv https://doi.org/10.5194/os-13-349-2017 2023-06-26T22:12:17Z Extensive biogeochemical transformation of organic matter takes place in the shallow continental shelf seas of Siberia. This, in combination with brine production from sea-ice formation, results in cold bottom waters with relatively high salinity and nutrient concentrations, as well as low oxygen and pH levels. Data from the SWERUS-C3 expedition with icebreaker Oden, from July to September 2014, show the distribution of such nutrient-rich, cold bottom waters along the continental margin from about 140 to 180 degrees E. The water with maximum nutrient concentration, classically named the upper halocline, is absent over the Lomonosov Ridge at 140 degrees E, while it appears in the Makarov Basin at 150 degrees E and intensifies further eastwards. At the intercept between the Mendeleev Ridge and the East Siberian continental shelf slope, the nutrient maximum is still intense, but distributed across a larger depth interval. The nutrient-rich water is found here at salinities of up to similar to 34.5, i.e. in the water classically named lower halocline. East of 170 degrees E transient tracers show significantly less ventilated waters below about 150 m water depth. This likely results from a local isolation of waters over the Chukchi Abyssal Plain as the boundary current from the west is steered away from this area by the bathymetry of the Mendeleev Ridge. The water with salinities of similar to 34.5 has high nutrients and low oxygen concentrations as well as low pH, typically indicating decay of organic matter. A deficit in nitrate relative to phosphate suggests that this process partly occurs under hypoxia. We conclude that the high nutrient water with salinity similar to 34.5 are formed on the shelf slope in the Mendeleev Ridge region from interior basin water that is trapped for enough time to attain its signature through interaction with the sediment. Article in Journal/Newspaper Chukchi East Siberian Sea Lomonosov Ridge makarov basin oden Sea ice SWERUS-C3 Siberia Karlstad University: Publications (DIVA) Chukchi Abyssal Plain ENVELOPE(-171.192,-171.192,76.285,76.285) East Siberian Sea ENVELOPE(166.000,166.000,74.000,74.000) Makarov Basin ENVELOPE(170.000,170.000,87.000,87.000) Ocean Science 13 2 349 363 |
institution |
Open Polar |
collection |
Karlstad University: Publications (DIVA) |
op_collection_id |
ftkarlstadsuniv |
language |
English |
topic |
Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser |
spellingShingle |
Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser Anderson, Leif G. Björk, Göran Holby, Ola Jutterstrom, Sara Morth, Carl Magnus O'Regan, Matt Pearce, Christof Semiletov, Igor Stranne, Christian Stoven, Tim Tanhua, Toste Ulfsbo, Adam Jakobsson, Martin Shelf-Basin interaction along the East Siberian Sea |
topic_facet |
Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser |
description |
Extensive biogeochemical transformation of organic matter takes place in the shallow continental shelf seas of Siberia. This, in combination with brine production from sea-ice formation, results in cold bottom waters with relatively high salinity and nutrient concentrations, as well as low oxygen and pH levels. Data from the SWERUS-C3 expedition with icebreaker Oden, from July to September 2014, show the distribution of such nutrient-rich, cold bottom waters along the continental margin from about 140 to 180 degrees E. The water with maximum nutrient concentration, classically named the upper halocline, is absent over the Lomonosov Ridge at 140 degrees E, while it appears in the Makarov Basin at 150 degrees E and intensifies further eastwards. At the intercept between the Mendeleev Ridge and the East Siberian continental shelf slope, the nutrient maximum is still intense, but distributed across a larger depth interval. The nutrient-rich water is found here at salinities of up to similar to 34.5, i.e. in the water classically named lower halocline. East of 170 degrees E transient tracers show significantly less ventilated waters below about 150 m water depth. This likely results from a local isolation of waters over the Chukchi Abyssal Plain as the boundary current from the west is steered away from this area by the bathymetry of the Mendeleev Ridge. The water with salinities of similar to 34.5 has high nutrients and low oxygen concentrations as well as low pH, typically indicating decay of organic matter. A deficit in nitrate relative to phosphate suggests that this process partly occurs under hypoxia. We conclude that the high nutrient water with salinity similar to 34.5 are formed on the shelf slope in the Mendeleev Ridge region from interior basin water that is trapped for enough time to attain its signature through interaction with the sediment. |
format |
Article in Journal/Newspaper |
author |
Anderson, Leif G. Björk, Göran Holby, Ola Jutterstrom, Sara Morth, Carl Magnus O'Regan, Matt Pearce, Christof Semiletov, Igor Stranne, Christian Stoven, Tim Tanhua, Toste Ulfsbo, Adam Jakobsson, Martin |
author_facet |
Anderson, Leif G. Björk, Göran Holby, Ola Jutterstrom, Sara Morth, Carl Magnus O'Regan, Matt Pearce, Christof Semiletov, Igor Stranne, Christian Stoven, Tim Tanhua, Toste Ulfsbo, Adam Jakobsson, Martin |
author_sort |
Anderson, Leif G. |
title |
Shelf-Basin interaction along the East Siberian Sea |
title_short |
Shelf-Basin interaction along the East Siberian Sea |
title_full |
Shelf-Basin interaction along the East Siberian Sea |
title_fullStr |
Shelf-Basin interaction along the East Siberian Sea |
title_full_unstemmed |
Shelf-Basin interaction along the East Siberian Sea |
title_sort |
shelf-basin interaction along the east siberian sea |
publisher |
Karlstads universitet, Avdelningen för energi-, miljö- och byggteknik |
publishDate |
2017 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-65519 https://doi.org/10.5194/os-13-349-2017 |
long_lat |
ENVELOPE(-171.192,-171.192,76.285,76.285) ENVELOPE(166.000,166.000,74.000,74.000) ENVELOPE(170.000,170.000,87.000,87.000) |
geographic |
Chukchi Abyssal Plain East Siberian Sea Makarov Basin |
geographic_facet |
Chukchi Abyssal Plain East Siberian Sea Makarov Basin |
genre |
Chukchi East Siberian Sea Lomonosov Ridge makarov basin oden Sea ice SWERUS-C3 Siberia |
genre_facet |
Chukchi East Siberian Sea Lomonosov Ridge makarov basin oden Sea ice SWERUS-C3 Siberia |
op_relation |
Ocean Science, 1812-0784, 2017, 13:2, s. 349-363 http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-65519 doi:10.5194/os-13-349-2017 ISI:000400167800001 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/os-13-349-2017 |
container_title |
Ocean Science |
container_volume |
13 |
container_issue |
2 |
container_start_page |
349 |
op_container_end_page |
363 |
_version_ |
1771544929081753600 |