Halocline water modification and along-slope advection at the Laptev Sea continental margin
A general pattern in water mass distribution and potential shelf–basin exchange is revealed at the Laptev Sea continental slope based on hydrochemical and stable oxygen isotope data from the summers 2005–2009. Despite considerable interannual variations, a frontal system can be inferred between shel...
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ftdoajarticles:oai:doaj.org/article:28eef4d032f144b088782858d347465e 2023-05-15T17:07:06+02:00 Halocline water modification and along-slope advection at the Laptev Sea continental margin D. Bauch S. Torres-Valdes I. Polyakov A. Novikhin I. Dmitrenko J. McKay A. Mix 2014-02-01T00:00:00Z https://doi.org/10.5194/os-10-141-2014 https://doaj.org/article/28eef4d032f144b088782858d347465e EN eng Copernicus Publications http://www.ocean-sci.net/10/141/2014/os-10-141-2014.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 1812-0784 1812-0792 doi:10.5194/os-10-141-2014 https://doaj.org/article/28eef4d032f144b088782858d347465e Ocean Science, Vol 10, Iss 1, Pp 141-154 (2014) Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2014 ftdoajarticles https://doi.org/10.5194/os-10-141-2014 2022-12-31T12:22:36Z A general pattern in water mass distribution and potential shelf–basin exchange is revealed at the Laptev Sea continental slope based on hydrochemical and stable oxygen isotope data from the summers 2005–2009. Despite considerable interannual variations, a frontal system can be inferred between shelf, continental slope and central Eurasian Basin waters in the upper 100 m of the water column along the continental slope. Net sea-ice melt is consistently found at the continental slope. However, the sea-ice meltwater signal is independent from the local retreat of the ice cover and appears to be advected from upwind locations. In addition to the along-slope frontal system at the continental shelf break, a strong gradient is identified on the Laptev Sea shelf between 122° E and 126° E with an eastward increase of riverine and sea-ice related brine water contents. These waters cross the shelf break at ~ 140° E and feed the low-salinity halocline water (LSHW, salinity S < 33) in the upper 50 m of the water column. High silicate concentrations in Laptev Sea bottom waters may lead to speculation about a link to the local silicate maximum found within the salinity range of ~ 33 to 34.5, typical for the Lower Halocline Water (LHW) at the continental slope. However brine signatures and nutrient ratios from the central Laptev Sea differ from those observed at the continental slope. Thus a significant contribution of Laptev Sea bottom waters to the LHW at the continental slope can be excluded. The silicate maximum within the LHW at the continental slope may be formed locally or at the outer Laptev Sea shelf. Similar to the advection of the sea-ice melt signal along the Laptev Sea continental slope, the nutrient signal at 50–70 m water depth within the LHW might also be fed by advection parallel to the slope. Thus, our analyses suggest that advective processes from upstream locations play a significant role in the halocline formation in the northern Laptev Sea. Article in Journal/Newspaper laptev Laptev Sea Sea ice Directory of Open Access Journals: DOAJ Articles Laptev Sea Ocean Science 10 1 141 154 |
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 D. Bauch S. Torres-Valdes I. Polyakov A. Novikhin I. Dmitrenko J. McKay A. Mix Halocline water modification and along-slope advection at the Laptev Sea continental margin |
topic_facet |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
description |
A general pattern in water mass distribution and potential shelf–basin exchange is revealed at the Laptev Sea continental slope based on hydrochemical and stable oxygen isotope data from the summers 2005–2009. Despite considerable interannual variations, a frontal system can be inferred between shelf, continental slope and central Eurasian Basin waters in the upper 100 m of the water column along the continental slope. Net sea-ice melt is consistently found at the continental slope. However, the sea-ice meltwater signal is independent from the local retreat of the ice cover and appears to be advected from upwind locations. In addition to the along-slope frontal system at the continental shelf break, a strong gradient is identified on the Laptev Sea shelf between 122° E and 126° E with an eastward increase of riverine and sea-ice related brine water contents. These waters cross the shelf break at ~ 140° E and feed the low-salinity halocline water (LSHW, salinity S < 33) in the upper 50 m of the water column. High silicate concentrations in Laptev Sea bottom waters may lead to speculation about a link to the local silicate maximum found within the salinity range of ~ 33 to 34.5, typical for the Lower Halocline Water (LHW) at the continental slope. However brine signatures and nutrient ratios from the central Laptev Sea differ from those observed at the continental slope. Thus a significant contribution of Laptev Sea bottom waters to the LHW at the continental slope can be excluded. The silicate maximum within the LHW at the continental slope may be formed locally or at the outer Laptev Sea shelf. Similar to the advection of the sea-ice melt signal along the Laptev Sea continental slope, the nutrient signal at 50–70 m water depth within the LHW might also be fed by advection parallel to the slope. Thus, our analyses suggest that advective processes from upstream locations play a significant role in the halocline formation in the northern Laptev Sea. |
format |
Article in Journal/Newspaper |
author |
D. Bauch S. Torres-Valdes I. Polyakov A. Novikhin I. Dmitrenko J. McKay A. Mix |
author_facet |
D. Bauch S. Torres-Valdes I. Polyakov A. Novikhin I. Dmitrenko J. McKay A. Mix |
author_sort |
D. Bauch |
title |
Halocline water modification and along-slope advection at the Laptev Sea continental margin |
title_short |
Halocline water modification and along-slope advection at the Laptev Sea continental margin |
title_full |
Halocline water modification and along-slope advection at the Laptev Sea continental margin |
title_fullStr |
Halocline water modification and along-slope advection at the Laptev Sea continental margin |
title_full_unstemmed |
Halocline water modification and along-slope advection at the Laptev Sea continental margin |
title_sort |
halocline water modification and along-slope advection at the laptev sea continental margin |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/os-10-141-2014 https://doaj.org/article/28eef4d032f144b088782858d347465e |
geographic |
Laptev Sea |
geographic_facet |
Laptev Sea |
genre |
laptev Laptev Sea Sea ice |
genre_facet |
laptev Laptev Sea Sea ice |
op_source |
Ocean Science, Vol 10, Iss 1, Pp 141-154 (2014) |
op_relation |
http://www.ocean-sci.net/10/141/2014/os-10-141-2014.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 1812-0784 1812-0792 doi:10.5194/os-10-141-2014 https://doaj.org/article/28eef4d032f144b088782858d347465e |
op_doi |
https://doi.org/10.5194/os-10-141-2014 |
container_title |
Ocean Science |
container_volume |
10 |
container_issue |
1 |
container_start_page |
141 |
op_container_end_page |
154 |
_version_ |
1766062292860928000 |