Combining physical and geochemical methods to investigate lower halocline water formation and modification along the Siberian continental slope
A series of cross-slope transects were occupied in 2013 and 2015 that extended eastward from St. Anna Trough to the Lomonosov Ridge. High-resolution physical and chemical observations collected along these transects revealed fronts in the potential temperature and the stable oxygen isotopic ratio (δ...
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Copernicus Publications
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Online Access: | https://doi.org/10.5194/os-13-983-2017 https://www.ocean-sci.net/13/983/2017/os-13-983-2017.pdf https://doaj.org/article/ca60093dc06b4d02b2acbf1d62ae7c11 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:ca60093dc06b4d02b2acbf1d62ae7c11 2023-05-15T17:08:21+02:00 Combining physical and geochemical methods to investigate lower halocline water formation and modification along the Siberian continental slope M. B. Alkire I. Polyakov R. Rember A. Pnyushkov V. Ivanov I. Ashik 2017-11-01 https://doi.org/10.5194/os-13-983-2017 https://www.ocean-sci.net/13/983/2017/os-13-983-2017.pdf https://doaj.org/article/ca60093dc06b4d02b2acbf1d62ae7c11 en eng Copernicus Publications doi:10.5194/os-13-983-2017 1812-0784 1812-0792 https://www.ocean-sci.net/13/983/2017/os-13-983-2017.pdf https://doaj.org/article/ca60093dc06b4d02b2acbf1d62ae7c11 undefined Ocean Science, Vol 13, Pp 983-995 (2017) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2017 fttriple https://doi.org/10.5194/os-13-983-2017 2023-01-22T19:11:46Z A series of cross-slope transects were occupied in 2013 and 2015 that extended eastward from St. Anna Trough to the Lomonosov Ridge. High-resolution physical and chemical observations collected along these transects revealed fronts in the potential temperature and the stable oxygen isotopic ratio (δ18O) that were observed north of Severnaya Zemlya (SZ). Using linear regressions, we describe mixing regimes on either side of the front that characterize a transition from a seasonal halocline to a permanent halocline. This transition describes the formation of lower halocline water (LHW) and the cold halocline layer via a mechanism that has been previously postulated by Rudels et al. (1996). Initial freshening of Atlantic Water (AW) by sea-ice meltwater occurs west of SZ, whereas higher influences of meteoric water and brine result in a transition to a separate mixing regime that alters LHW through mixing with overlying waters and shifts the characteristic temperature–salinity bend from higher (34.4 ≤ S ≤ 34.5) toward lower (34.2 ≤ S ≤ 34.3) salinities. These mixing regimes appear to have been robust since at least 2000. Article in Journal/Newspaper Lomonosov Ridge Sea ice Severnaya Zemlya Unknown Severnaya Zemlya ENVELOPE(98.000,98.000,79.500,79.500) St. Anna Trough ENVELOPE(69.500,69.500,80.750,80.750) Ocean Science 13 6 983 995 |
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Open Polar |
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language |
English |
topic |
geo envir |
spellingShingle |
geo envir M. B. Alkire I. Polyakov R. Rember A. Pnyushkov V. Ivanov I. Ashik Combining physical and geochemical methods to investigate lower halocline water formation and modification along the Siberian continental slope |
topic_facet |
geo envir |
description |
A series of cross-slope transects were occupied in 2013 and 2015 that extended eastward from St. Anna Trough to the Lomonosov Ridge. High-resolution physical and chemical observations collected along these transects revealed fronts in the potential temperature and the stable oxygen isotopic ratio (δ18O) that were observed north of Severnaya Zemlya (SZ). Using linear regressions, we describe mixing regimes on either side of the front that characterize a transition from a seasonal halocline to a permanent halocline. This transition describes the formation of lower halocline water (LHW) and the cold halocline layer via a mechanism that has been previously postulated by Rudels et al. (1996). Initial freshening of Atlantic Water (AW) by sea-ice meltwater occurs west of SZ, whereas higher influences of meteoric water and brine result in a transition to a separate mixing regime that alters LHW through mixing with overlying waters and shifts the characteristic temperature–salinity bend from higher (34.4 ≤ S ≤ 34.5) toward lower (34.2 ≤ S ≤ 34.3) salinities. These mixing regimes appear to have been robust since at least 2000. |
format |
Article in Journal/Newspaper |
author |
M. B. Alkire I. Polyakov R. Rember A. Pnyushkov V. Ivanov I. Ashik |
author_facet |
M. B. Alkire I. Polyakov R. Rember A. Pnyushkov V. Ivanov I. Ashik |
author_sort |
M. B. Alkire |
title |
Combining physical and geochemical methods to investigate lower halocline water formation and modification along the Siberian continental slope |
title_short |
Combining physical and geochemical methods to investigate lower halocline water formation and modification along the Siberian continental slope |
title_full |
Combining physical and geochemical methods to investigate lower halocline water formation and modification along the Siberian continental slope |
title_fullStr |
Combining physical and geochemical methods to investigate lower halocline water formation and modification along the Siberian continental slope |
title_full_unstemmed |
Combining physical and geochemical methods to investigate lower halocline water formation and modification along the Siberian continental slope |
title_sort |
combining physical and geochemical methods to investigate lower halocline water formation and modification along the siberian continental slope |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/os-13-983-2017 https://www.ocean-sci.net/13/983/2017/os-13-983-2017.pdf https://doaj.org/article/ca60093dc06b4d02b2acbf1d62ae7c11 |
long_lat |
ENVELOPE(98.000,98.000,79.500,79.500) ENVELOPE(69.500,69.500,80.750,80.750) |
geographic |
Severnaya Zemlya St. Anna Trough |
geographic_facet |
Severnaya Zemlya St. Anna Trough |
genre |
Lomonosov Ridge Sea ice Severnaya Zemlya |
genre_facet |
Lomonosov Ridge Sea ice Severnaya Zemlya |
op_source |
Ocean Science, Vol 13, Pp 983-995 (2017) |
op_relation |
doi:10.5194/os-13-983-2017 1812-0784 1812-0792 https://www.ocean-sci.net/13/983/2017/os-13-983-2017.pdf https://doaj.org/article/ca60093dc06b4d02b2acbf1d62ae7c11 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/os-13-983-2017 |
container_title |
Ocean Science |
container_volume |
13 |
container_issue |
6 |
container_start_page |
983 |
op_container_end_page |
995 |
_version_ |
1766064096770260992 |