The Emergence of the North Icelandic Jet and Its Evolution from Northeast Iceland to Denmark Strait
The North Icelandic Jet (NIJ) is an important source of dense water to the overflow plume passing through Denmark Strait. The properties, structure, and transport of the NIJ are investigated for the first time along its entire pathway following the continental slope north of Iceland, using 13 hydrog...
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American Meteorological Society
2020
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Online Access: | https://hdl.handle.net/1956/21959 https://doi.org/10.1175/jpo-d-19-0088.1 |
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ftunivbergen:oai:bora.uib.no:1956/21959 2023-05-15T16:00:35+02:00 The Emergence of the North Icelandic Jet and Its Evolution from Northeast Iceland to Denmark Strait Semper, Stefanie Våge, Kjetil Pickart, Robert S. Valdimarsson, Hedinn Torres, Daniel J. Jónsson, Steingrímur 2020-02-13T08:29:06Z application/pdf https://hdl.handle.net/1956/21959 https://doi.org/10.1175/jpo-d-19-0088.1 eng eng American Meteorological Society Norges forskningsråd: 231647 Bergens forskningsstiftelse: BFS2016REK01 urn:issn:0022-3670 urn:issn:1520-0485 https://hdl.handle.net/1956/21959 https://doi.org/10.1175/jpo-d-19-0088.1 cristin:1727945 Attribution CC BY http://creativecommons.org/licenses/by/4.0 Copyright 2019 American Meteorological Society Journal of Physical Oceanography Peer reviewed Journal article 2020 ftunivbergen https://doi.org/10.1175/jpo-d-19-0088.1 2023-03-14T17:41:41Z The North Icelandic Jet (NIJ) is an important source of dense water to the overflow plume passing through Denmark Strait. The properties, structure, and transport of the NIJ are investigated for the first time along its entire pathway following the continental slope north of Iceland, using 13 hydrographic/velocity surveys of high spatial resolution conducted between 2004 and 2018. The comprehensive dataset reveals that the current originates northeast of Iceland and increases in volume transport by roughly 0.4 Sv (1 Sv ≡ 106 m3 s−1) per 100 km until 300 km upstream of Denmark Strait, at which point the highest transport is reached. The bulk of the NIJ transport is confined to a small area in Θ–S space centered near −0.29° ± 0.16°C in Conservative Temperature and 35.075 ± 0.006 g kg−1 in Absolute Salinity. While the hydrographic properties of this transport mode are not significantly modified along the NIJ’s pathway, the transport estimates vary considerably between and within the surveys. Neither a clear seasonal signal nor a consistent link to atmospheric forcing was found, but barotropic and/or baroclinic instability is likely active in the current. The NIJ displays a double-core structure in roughly 50% of the occupations, with the two cores centered at the 600- and 800-m isobaths, respectively. The transport of overflow water 300 km upstream of Denmark Strait exceeds 1.8 ± 0.3 Sv, which is substantially larger than estimates from a year-long mooring array and hydrographic/velocity surveys closer to the strait, where the NIJ merges with the separated East Greenland Current. This implies a more substantial contribution of the NIJ to the Denmark Strait overflow plume than previously envisaged. publishedVersion Article in Journal/Newspaper Denmark Strait East Greenland east greenland current Greenland Iceland University of Bergen: Bergen Open Research Archive (BORA-UiB) Greenland Journal of Physical Oceanography 49 10 2499 2521 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
The North Icelandic Jet (NIJ) is an important source of dense water to the overflow plume passing through Denmark Strait. The properties, structure, and transport of the NIJ are investigated for the first time along its entire pathway following the continental slope north of Iceland, using 13 hydrographic/velocity surveys of high spatial resolution conducted between 2004 and 2018. The comprehensive dataset reveals that the current originates northeast of Iceland and increases in volume transport by roughly 0.4 Sv (1 Sv ≡ 106 m3 s−1) per 100 km until 300 km upstream of Denmark Strait, at which point the highest transport is reached. The bulk of the NIJ transport is confined to a small area in Θ–S space centered near −0.29° ± 0.16°C in Conservative Temperature and 35.075 ± 0.006 g kg−1 in Absolute Salinity. While the hydrographic properties of this transport mode are not significantly modified along the NIJ’s pathway, the transport estimates vary considerably between and within the surveys. Neither a clear seasonal signal nor a consistent link to atmospheric forcing was found, but barotropic and/or baroclinic instability is likely active in the current. The NIJ displays a double-core structure in roughly 50% of the occupations, with the two cores centered at the 600- and 800-m isobaths, respectively. The transport of overflow water 300 km upstream of Denmark Strait exceeds 1.8 ± 0.3 Sv, which is substantially larger than estimates from a year-long mooring array and hydrographic/velocity surveys closer to the strait, where the NIJ merges with the separated East Greenland Current. This implies a more substantial contribution of the NIJ to the Denmark Strait overflow plume than previously envisaged. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Semper, Stefanie Våge, Kjetil Pickart, Robert S. Valdimarsson, Hedinn Torres, Daniel J. Jónsson, Steingrímur |
spellingShingle |
Semper, Stefanie Våge, Kjetil Pickart, Robert S. Valdimarsson, Hedinn Torres, Daniel J. Jónsson, Steingrímur The Emergence of the North Icelandic Jet and Its Evolution from Northeast Iceland to Denmark Strait |
author_facet |
Semper, Stefanie Våge, Kjetil Pickart, Robert S. Valdimarsson, Hedinn Torres, Daniel J. Jónsson, Steingrímur |
author_sort |
Semper, Stefanie |
title |
The Emergence of the North Icelandic Jet and Its Evolution from Northeast Iceland to Denmark Strait |
title_short |
The Emergence of the North Icelandic Jet and Its Evolution from Northeast Iceland to Denmark Strait |
title_full |
The Emergence of the North Icelandic Jet and Its Evolution from Northeast Iceland to Denmark Strait |
title_fullStr |
The Emergence of the North Icelandic Jet and Its Evolution from Northeast Iceland to Denmark Strait |
title_full_unstemmed |
The Emergence of the North Icelandic Jet and Its Evolution from Northeast Iceland to Denmark Strait |
title_sort |
emergence of the north icelandic jet and its evolution from northeast iceland to denmark strait |
publisher |
American Meteorological Society |
publishDate |
2020 |
url |
https://hdl.handle.net/1956/21959 https://doi.org/10.1175/jpo-d-19-0088.1 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Denmark Strait East Greenland east greenland current Greenland Iceland |
genre_facet |
Denmark Strait East Greenland east greenland current Greenland Iceland |
op_source |
Journal of Physical Oceanography |
op_relation |
Norges forskningsråd: 231647 Bergens forskningsstiftelse: BFS2016REK01 urn:issn:0022-3670 urn:issn:1520-0485 https://hdl.handle.net/1956/21959 https://doi.org/10.1175/jpo-d-19-0088.1 cristin:1727945 |
op_rights |
Attribution CC BY http://creativecommons.org/licenses/by/4.0 Copyright 2019 American Meteorological Society |
op_doi |
https://doi.org/10.1175/jpo-d-19-0088.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
49 |
container_issue |
10 |
container_start_page |
2499 |
op_container_end_page |
2521 |
_version_ |
1766396588175917056 |