Decadal and multi-decadal variability of Labrador Sea Water in the north-western North Atlantic Ocean derived from tracer distributions: Heat budget, ventilation, and advection
Time series of profiles of potential temperature, salinity, dissolved oxygen, and planetary potential vorticity at intermediate depths in the Labrador Sea, the Irminger Sea, and the Iceland Basin have been constructed by combining the hydrographic sections crossing the sub-arctic gyre of the North A...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Language: | English |
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ftnioz:oai:imis.nioz.nl:231322 2023-05-15T15:15:19+02:00 Decadal and multi-decadal variability of Labrador Sea Water in the north-western North Atlantic Ocean derived from tracer distributions: Heat budget, ventilation, and advection van Aken, H.M. de Jong, M.F. Yashayaev, I. 2011 http://imis.nioz.nl/imis.php?module=ref&refid=231322 en eng info:eu-repo/semantics/altIdentifier/wos/000291135100002 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1016/j.dsr.2011.02.008 http://imis.nioz.nl/imis.php?module=ref&refid=231322 info:eu-repo/semantics/closedAccess %3Ci%3EDeep-Sea+Res.,+Part+1,+Oceanogr.+Res.+Pap.+58%285%29%3C%2Fi%3E%3A+505-523.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.dsr.2011.02.008%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.dsr.2011.02.008%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2011 ftnioz https://doi.org/10.1016/j.dsr.2011.02.008 2022-05-01T13:58:17Z Time series of profiles of potential temperature, salinity, dissolved oxygen, and planetary potential vorticity at intermediate depths in the Labrador Sea, the Irminger Sea, and the Iceland Basin have been constructed by combining the hydrographic sections crossing the sub-arctic gyre of the North Atlantic Ocean from the coast of Labrador to Europe, occupied nearly annually since 1990, and historic hydrographic data from the preceding years since 1950. The temperature data of the last 60 years mainly reflect a multi-decadal variability, with a characteristic time scale of about 50 years. With the use of a highly simplified heat budget model it was shown that this long-term temperature variability in the Labrador Sea mainly reflects the long-term variation of the net heat flux to the atmosphere. However, the analysis of the data on dissolved oxygen and planetary potential vorticity show that convective ventilation events, during which successive classes of Labrador Sea Water (LSW) are formed, occurring on decadal or shorter time scales. These convective ventilation events have performed the role of vertical mixing in the heat budget model, homogenising the properties of the intermediate layers (e.g. temperature) for significant periods of time. Both the long-term and the near-decadal temperature signals at a pressure of 1500 dbar are connected with successive deep LSW classes, emphasising the leading role of Labrador Sea convection in running the variability of the intermediate depth layers of the North Atlantic. These signals are advected to the neighbouring Irminger Sea and Iceland Basin. Advection time scales, estimated from the 60 year time series, are slightly shorter or of the same order as most earlier estimates, which were mainly based on the feature tracking of the spreading of the LSW(94) class formed in the period 1989-1994 in the Labrador Sea. Article in Journal/Newspaper Arctic Iceland Labrador Sea North Atlantic NIOZ Repository (Royal Netherlands Institute for Sea Research) Arctic Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Deep Sea Research Part I: Oceanographic Research Papers 58 5 505 523 |
institution |
Open Polar |
collection |
NIOZ Repository (Royal Netherlands Institute for Sea Research) |
op_collection_id |
ftnioz |
language |
English |
description |
Time series of profiles of potential temperature, salinity, dissolved oxygen, and planetary potential vorticity at intermediate depths in the Labrador Sea, the Irminger Sea, and the Iceland Basin have been constructed by combining the hydrographic sections crossing the sub-arctic gyre of the North Atlantic Ocean from the coast of Labrador to Europe, occupied nearly annually since 1990, and historic hydrographic data from the preceding years since 1950. The temperature data of the last 60 years mainly reflect a multi-decadal variability, with a characteristic time scale of about 50 years. With the use of a highly simplified heat budget model it was shown that this long-term temperature variability in the Labrador Sea mainly reflects the long-term variation of the net heat flux to the atmosphere. However, the analysis of the data on dissolved oxygen and planetary potential vorticity show that convective ventilation events, during which successive classes of Labrador Sea Water (LSW) are formed, occurring on decadal or shorter time scales. These convective ventilation events have performed the role of vertical mixing in the heat budget model, homogenising the properties of the intermediate layers (e.g. temperature) for significant periods of time. Both the long-term and the near-decadal temperature signals at a pressure of 1500 dbar are connected with successive deep LSW classes, emphasising the leading role of Labrador Sea convection in running the variability of the intermediate depth layers of the North Atlantic. These signals are advected to the neighbouring Irminger Sea and Iceland Basin. Advection time scales, estimated from the 60 year time series, are slightly shorter or of the same order as most earlier estimates, which were mainly based on the feature tracking of the spreading of the LSW(94) class formed in the period 1989-1994 in the Labrador Sea. |
format |
Article in Journal/Newspaper |
author |
van Aken, H.M. de Jong, M.F. Yashayaev, I. |
spellingShingle |
van Aken, H.M. de Jong, M.F. Yashayaev, I. Decadal and multi-decadal variability of Labrador Sea Water in the north-western North Atlantic Ocean derived from tracer distributions: Heat budget, ventilation, and advection |
author_facet |
van Aken, H.M. de Jong, M.F. Yashayaev, I. |
author_sort |
van Aken, H.M. |
title |
Decadal and multi-decadal variability of Labrador Sea Water in the north-western North Atlantic Ocean derived from tracer distributions: Heat budget, ventilation, and advection |
title_short |
Decadal and multi-decadal variability of Labrador Sea Water in the north-western North Atlantic Ocean derived from tracer distributions: Heat budget, ventilation, and advection |
title_full |
Decadal and multi-decadal variability of Labrador Sea Water in the north-western North Atlantic Ocean derived from tracer distributions: Heat budget, ventilation, and advection |
title_fullStr |
Decadal and multi-decadal variability of Labrador Sea Water in the north-western North Atlantic Ocean derived from tracer distributions: Heat budget, ventilation, and advection |
title_full_unstemmed |
Decadal and multi-decadal variability of Labrador Sea Water in the north-western North Atlantic Ocean derived from tracer distributions: Heat budget, ventilation, and advection |
title_sort |
decadal and multi-decadal variability of labrador sea water in the north-western north atlantic ocean derived from tracer distributions: heat budget, ventilation, and advection |
publishDate |
2011 |
url |
http://imis.nioz.nl/imis.php?module=ref&refid=231322 |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Arctic Irminger Sea |
geographic_facet |
Arctic Irminger Sea |
genre |
Arctic Iceland Labrador Sea North Atlantic |
genre_facet |
Arctic Iceland Labrador Sea North Atlantic |
op_source |
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op_relation |
info:eu-repo/semantics/altIdentifier/wos/000291135100002 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1016/j.dsr.2011.02.008 http://imis.nioz.nl/imis.php?module=ref&refid=231322 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.dsr.2011.02.008 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
58 |
container_issue |
5 |
container_start_page |
505 |
op_container_end_page |
523 |
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