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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Online Access: | https://doi.org/10.5194/os-13-349-2017 https://doaj.org/article/c4ad4bfc9093475ca460333285fd4603 |
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ftdoajarticles:oai:doaj.org/article:c4ad4bfc9093475ca460333285fd4603 2023-05-15T15:54:37+02:00 Shelf–Basin interaction along the East Siberian Sea L. G. Anderson G. Björk O. Holby S. Jutterström C. M. Mörth M. O'Regan C. Pearce I. Semiletov C. Stranne T. Stöven T. Tanhua A. Ulfsbo M. Jakobsson 2017-04-01T00:00:00Z https://doi.org/10.5194/os-13-349-2017 https://doaj.org/article/c4ad4bfc9093475ca460333285fd4603 EN eng Copernicus Publications http://www.ocean-sci.net/13/349/2017/os-13-349-2017.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 1812-0784 1812-0792 doi:10.5194/os-13-349-2017 https://doaj.org/article/c4ad4bfc9093475ca460333285fd4603 Ocean Science, Vol 13, Iss 2, Pp 349-363 (2017) Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2017 ftdoajarticles https://doi.org/10.5194/os-13-349-2017 2022-12-30T22:57:27Z 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° E. The water with maximum nutrient concentration, classically named the upper halocline, is absent over the Lomonosov Ridge at 140° E, while it appears in the Makarov Basin at 150° 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 ∼ 34.5, i.e. in the water classically named lower halocline. East of 170° 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 ∼ 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 ∼ 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 Directory of Open Access Journals: DOAJ Articles East Siberian Sea ENVELOPE(166.000,166.000,74.000,74.000) Makarov Basin ENVELOPE(170.000,170.000,87.000,87.000) Chukchi Abyssal Plain ENVELOPE(-171.192,-171.192,76.285,76.285) Ocean Science 13 2 349 363 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
spellingShingle |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 L. G. Anderson G. Björk O. Holby S. Jutterström C. M. Mörth M. O'Regan C. Pearce I. Semiletov C. Stranne T. Stöven T. Tanhua A. Ulfsbo M. Jakobsson Shelf–Basin interaction along the East Siberian Sea |
topic_facet |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
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° E. The water with maximum nutrient concentration, classically named the upper halocline, is absent over the Lomonosov Ridge at 140° E, while it appears in the Makarov Basin at 150° 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 ∼ 34.5, i.e. in the water classically named lower halocline. East of 170° 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 ∼ 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 ∼ 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 |
L. G. Anderson G. Björk O. Holby S. Jutterström C. M. Mörth M. O'Regan C. Pearce I. Semiletov C. Stranne T. Stöven T. Tanhua A. Ulfsbo M. Jakobsson |
author_facet |
L. G. Anderson G. Björk O. Holby S. Jutterström C. M. Mörth M. O'Regan C. Pearce I. Semiletov C. Stranne T. Stöven T. Tanhua A. Ulfsbo M. Jakobsson |
author_sort |
L. G. Anderson |
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 |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/os-13-349-2017 https://doaj.org/article/c4ad4bfc9093475ca460333285fd4603 |
long_lat |
ENVELOPE(166.000,166.000,74.000,74.000) ENVELOPE(170.000,170.000,87.000,87.000) ENVELOPE(-171.192,-171.192,76.285,76.285) |
geographic |
East Siberian Sea Makarov Basin Chukchi Abyssal Plain |
geographic_facet |
East Siberian Sea Makarov Basin Chukchi Abyssal Plain |
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_source |
Ocean Science, Vol 13, Iss 2, Pp 349-363 (2017) |
op_relation |
http://www.ocean-sci.net/13/349/2017/os-13-349-2017.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 1812-0784 1812-0792 doi:10.5194/os-13-349-2017 https://doaj.org/article/c4ad4bfc9093475ca460333285fd4603 |
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_ |
1766389856776224768 |