Near-bottom water warming in the Laptev Sea in response to atmospheric and sea-ice conditions in 2007
In this paper we present new data from ship-based measurements and two-year observations from moorings in the Laptev Sea along with Russian historical data. The observations from the Laptev Sea in 2007 indicate that the bottom water temperatures on the mid-shelf increased by more than 3°C...
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Norwegian Polar Institute
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ftdoajarticles:oai:doaj.org/article:23504deb5e3146f3928aa51d51e348fb 2023-05-15T16:37:34+02:00 Near-bottom water warming in the Laptev Sea in response to atmospheric and sea-ice conditions in 2007 Jens A. Hölemann Sergey Kirillov Torben Klagge Andrey Novikhin Heidemarie Kassens Leonid Timokhov 2011-05-01T00:00:00Z https://doi.org/10.3402/polar.v30i0.6425 https://doaj.org/article/23504deb5e3146f3928aa51d51e348fb EN eng Norwegian Polar Institute http://www.polarresearch.net/index.php/polar/article/view/6425/pdf_126 https://doaj.org/toc/0800-0395 https://doaj.org/toc/1751-8369 doi:10.3402/polar.v30i0.6425 0800-0395 1751-8369 https://doaj.org/article/23504deb5e3146f3928aa51d51e348fb Polar Research, Vol 30, Iss 0, Pp 1-15 (2011) Siberian Shelf seas shelf oceanography sea ice atmospheric forcing Environmental sciences GE1-350 Oceanography GC1-1581 article 2011 ftdoajarticles https://doi.org/10.3402/polar.v30i0.6425 2022-12-31T01:38:26Z In this paper we present new data from ship-based measurements and two-year observations from moorings in the Laptev Sea along with Russian historical data. The observations from the Laptev Sea in 2007 indicate that the bottom water temperatures on the mid-shelf increased by more than 3°C compared to the long-term mean as a consequence of the unusually high summertime surface water temperatures. Such a distinct increase in near-bottom temperatures has not been observed before. Remnants of the relatively warm bottom water occupied the mid-shelf from September 2007 until April 2008. Strong polynya activity during March to May 2007 caused more summertime open water and therefore warmer sea surface temperatures in the Laptev Sea. During the ice-free period in August and September 2007, the prevailing cyclonic atmospheric circulation deflected the freshwater plume of the River Lena to the east, which increased the salinity on the mid-shelf north of the Lena Delta. The resulting weaker density stratification allowed more vertical mixing of the water column during storms in late September and early October, leading to the observed warming of the near-bottom layer in the still ice-free Laptev Sea. In summer and autumn 2008, when the density stratification was stronger and sea surface temperatures were close to the long-term mean, no near-bottom water warming was observed. Warmer water temperatures near the seabed may also impact the stability of the shelf's submarine permafrost. Article in Journal/Newspaper Ice laptev Laptev Sea lena delta permafrost Polar Research Sea ice Directory of Open Access Journals: DOAJ Articles Laptev Sea Polar Research 30 1 6425 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Siberian Shelf seas shelf oceanography sea ice atmospheric forcing Environmental sciences GE1-350 Oceanography GC1-1581 |
spellingShingle |
Siberian Shelf seas shelf oceanography sea ice atmospheric forcing Environmental sciences GE1-350 Oceanography GC1-1581 Jens A. Hölemann Sergey Kirillov Torben Klagge Andrey Novikhin Heidemarie Kassens Leonid Timokhov Near-bottom water warming in the Laptev Sea in response to atmospheric and sea-ice conditions in 2007 |
topic_facet |
Siberian Shelf seas shelf oceanography sea ice atmospheric forcing Environmental sciences GE1-350 Oceanography GC1-1581 |
description |
In this paper we present new data from ship-based measurements and two-year observations from moorings in the Laptev Sea along with Russian historical data. The observations from the Laptev Sea in 2007 indicate that the bottom water temperatures on the mid-shelf increased by more than 3°C compared to the long-term mean as a consequence of the unusually high summertime surface water temperatures. Such a distinct increase in near-bottom temperatures has not been observed before. Remnants of the relatively warm bottom water occupied the mid-shelf from September 2007 until April 2008. Strong polynya activity during March to May 2007 caused more summertime open water and therefore warmer sea surface temperatures in the Laptev Sea. During the ice-free period in August and September 2007, the prevailing cyclonic atmospheric circulation deflected the freshwater plume of the River Lena to the east, which increased the salinity on the mid-shelf north of the Lena Delta. The resulting weaker density stratification allowed more vertical mixing of the water column during storms in late September and early October, leading to the observed warming of the near-bottom layer in the still ice-free Laptev Sea. In summer and autumn 2008, when the density stratification was stronger and sea surface temperatures were close to the long-term mean, no near-bottom water warming was observed. Warmer water temperatures near the seabed may also impact the stability of the shelf's submarine permafrost. |
format |
Article in Journal/Newspaper |
author |
Jens A. Hölemann Sergey Kirillov Torben Klagge Andrey Novikhin Heidemarie Kassens Leonid Timokhov |
author_facet |
Jens A. Hölemann Sergey Kirillov Torben Klagge Andrey Novikhin Heidemarie Kassens Leonid Timokhov |
author_sort |
Jens A. Hölemann |
title |
Near-bottom water warming in the Laptev Sea in response to atmospheric and sea-ice conditions in 2007 |
title_short |
Near-bottom water warming in the Laptev Sea in response to atmospheric and sea-ice conditions in 2007 |
title_full |
Near-bottom water warming in the Laptev Sea in response to atmospheric and sea-ice conditions in 2007 |
title_fullStr |
Near-bottom water warming in the Laptev Sea in response to atmospheric and sea-ice conditions in 2007 |
title_full_unstemmed |
Near-bottom water warming in the Laptev Sea in response to atmospheric and sea-ice conditions in 2007 |
title_sort |
near-bottom water warming in the laptev sea in response to atmospheric and sea-ice conditions in 2007 |
publisher |
Norwegian Polar Institute |
publishDate |
2011 |
url |
https://doi.org/10.3402/polar.v30i0.6425 https://doaj.org/article/23504deb5e3146f3928aa51d51e348fb |
geographic |
Laptev Sea |
geographic_facet |
Laptev Sea |
genre |
Ice laptev Laptev Sea lena delta permafrost Polar Research Sea ice |
genre_facet |
Ice laptev Laptev Sea lena delta permafrost Polar Research Sea ice |
op_source |
Polar Research, Vol 30, Iss 0, Pp 1-15 (2011) |
op_relation |
http://www.polarresearch.net/index.php/polar/article/view/6425/pdf_126 https://doaj.org/toc/0800-0395 https://doaj.org/toc/1751-8369 doi:10.3402/polar.v30i0.6425 0800-0395 1751-8369 https://doaj.org/article/23504deb5e3146f3928aa51d51e348fb |
op_doi |
https://doi.org/10.3402/polar.v30i0.6425 |
container_title |
Polar Research |
container_volume |
30 |
container_issue |
1 |
container_start_page |
6425 |
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1766027857668079616 |