The impact of Siberian coastal polynyas on shelf-derived Arctic Ocean halocline waters
Hydrographic and stable oxygen isotope (H218O/H216O) sampling was carried out within the West New Siberian (WNS) coastal polynyas in the southern Laptev Sea in late winters 2008 and 2009. The impact of sea-ice formation on the water column was quantified by a salinity/{lower case delta}18O mass bala...
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ftawi:oai:epic.awi.de:25566 2023-05-15T14:27:08+02:00 The impact of Siberian coastal polynyas on shelf-derived Arctic Ocean halocline waters Bauch, Dorothea Hölemann, Jens Dmitrenko, Igor Janout, Markus Nikulina, Anna Kirillov, Sergey Krumpen, Thomas Kassens, Heidemarie Timokhov, Leo 2011-12-05 https://epic.awi.de/id/eprint/25566/ https://hdl.handle.net/10013/epic.40980 unknown AMER GEOPHYSICAL UNION Bauch, D. , Hölemann, J. orcid:0000-0001-5102-4086 , Dmitrenko, I. , Janout, M. orcid:0000-0003-4908-2855 , Nikulina, A. , Kirillov, S. , Krumpen, T. orcid:0000-0001-6234-8756 , Kassens, H. and Timokhov, L. (2011) The impact of Siberian coastal polynyas on shelf-derived Arctic Ocean halocline waters , Journal of Geophysical Research-Oceans . hdl:10013/epic.40980 EPIC3Journal of Geophysical Research-Oceans, AMER GEOPHYSICAL UNION, ISSN: 0148-0227 Article isiRev 2011 ftawi 2021-12-24T15:35:27Z Hydrographic and stable oxygen isotope (H218O/H216O) sampling was carried out within the West New Siberian (WNS) coastal polynyas in the southern Laptev Sea in late winters 2008 and 2009. The impact of sea-ice formation on the water column was quantified by a salinity/{lower case delta}18O mass balance. Several stations had vertically homogeneous physical properties in April/May 2008 and featured polynya-formed local bottom water with elevated signals of brine released during sea-ice formation and elevated fractions of river water. The polynya-formed bottom water was fresher than surrounding bottom waters. At other stations salinity/{lower case delta}18O correlation showed well defined mixing lines for bottom and surface layers. In March/April 2009 surface waters were strongly influenced by Lena River water and local polynya activity with elevated brine signals reached to intermediate depth, but did not penetrate the bottom layer in the highly stratified water column. Inventory values of sea-ice formation were comparable in both years, but freshwater distributions from the preceding summers were different. Therefore, the observed difference in the impact of polynya activity on the water column is not primarily controlled by the amount of sea-ice formed during winter but by preconditioning from the preceding summer. Only in years when the river plume is mostly absent in the polynya region stratification is weak and allows winter sea-ice formation to reach the bottom layer. Thus summer stratification controls the influence of local polynya water on the shelf's bottom hydrography and, as bottom water is exported, impacts on the source water of shelf-derived halocline waters. Article in Journal/Newspaper Arctic Arctic Arctic Ocean laptev Laptev Sea lena river Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Ocean Laptev Sea |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Hydrographic and stable oxygen isotope (H218O/H216O) sampling was carried out within the West New Siberian (WNS) coastal polynyas in the southern Laptev Sea in late winters 2008 and 2009. The impact of sea-ice formation on the water column was quantified by a salinity/{lower case delta}18O mass balance. Several stations had vertically homogeneous physical properties in April/May 2008 and featured polynya-formed local bottom water with elevated signals of brine released during sea-ice formation and elevated fractions of river water. The polynya-formed bottom water was fresher than surrounding bottom waters. At other stations salinity/{lower case delta}18O correlation showed well defined mixing lines for bottom and surface layers. In March/April 2009 surface waters were strongly influenced by Lena River water and local polynya activity with elevated brine signals reached to intermediate depth, but did not penetrate the bottom layer in the highly stratified water column. Inventory values of sea-ice formation were comparable in both years, but freshwater distributions from the preceding summers were different. Therefore, the observed difference in the impact of polynya activity on the water column is not primarily controlled by the amount of sea-ice formed during winter but by preconditioning from the preceding summer. Only in years when the river plume is mostly absent in the polynya region stratification is weak and allows winter sea-ice formation to reach the bottom layer. Thus summer stratification controls the influence of local polynya water on the shelf's bottom hydrography and, as bottom water is exported, impacts on the source water of shelf-derived halocline waters. |
format |
Article in Journal/Newspaper |
author |
Bauch, Dorothea Hölemann, Jens Dmitrenko, Igor Janout, Markus Nikulina, Anna Kirillov, Sergey Krumpen, Thomas Kassens, Heidemarie Timokhov, Leo |
spellingShingle |
Bauch, Dorothea Hölemann, Jens Dmitrenko, Igor Janout, Markus Nikulina, Anna Kirillov, Sergey Krumpen, Thomas Kassens, Heidemarie Timokhov, Leo The impact of Siberian coastal polynyas on shelf-derived Arctic Ocean halocline waters |
author_facet |
Bauch, Dorothea Hölemann, Jens Dmitrenko, Igor Janout, Markus Nikulina, Anna Kirillov, Sergey Krumpen, Thomas Kassens, Heidemarie Timokhov, Leo |
author_sort |
Bauch, Dorothea |
title |
The impact of Siberian coastal polynyas on shelf-derived Arctic Ocean halocline waters |
title_short |
The impact of Siberian coastal polynyas on shelf-derived Arctic Ocean halocline waters |
title_full |
The impact of Siberian coastal polynyas on shelf-derived Arctic Ocean halocline waters |
title_fullStr |
The impact of Siberian coastal polynyas on shelf-derived Arctic Ocean halocline waters |
title_full_unstemmed |
The impact of Siberian coastal polynyas on shelf-derived Arctic Ocean halocline waters |
title_sort |
impact of siberian coastal polynyas on shelf-derived arctic ocean halocline waters |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2011 |
url |
https://epic.awi.de/id/eprint/25566/ https://hdl.handle.net/10013/epic.40980 |
geographic |
Arctic Arctic Ocean Laptev Sea |
geographic_facet |
Arctic Arctic Ocean Laptev Sea |
genre |
Arctic Arctic Arctic Ocean laptev Laptev Sea lena river Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean laptev Laptev Sea lena river Sea ice |
op_source |
EPIC3Journal of Geophysical Research-Oceans, AMER GEOPHYSICAL UNION, ISSN: 0148-0227 |
op_relation |
Bauch, D. , Hölemann, J. orcid:0000-0001-5102-4086 , Dmitrenko, I. , Janout, M. orcid:0000-0003-4908-2855 , Nikulina, A. , Kirillov, S. , Krumpen, T. orcid:0000-0001-6234-8756 , Kassens, H. and Timokhov, L. (2011) The impact of Siberian coastal polynyas on shelf-derived Arctic Ocean halocline waters , Journal of Geophysical Research-Oceans . hdl:10013/epic.40980 |
_version_ |
1766300739738533888 |