Changes in the Deep Western Boundary Current at 53°N
Southward transports in the deep western boundary current across 53°N, over 1949–99, are determined from a historical reconstruction. Long-term mean transports, for given water masses, for net southward transport (the southward component of the transport not including recirculation given in parenthe...
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Online Access: | https://era.library.ualberta.ca/items/b9f816bd-3515-4acb-aad4-db873dacd2e4 https://doi.org/10.7939/R3PN8XW1Z |
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ftunivalberta:oai:era.library.ualberta.ca:b9f816bd-3515-4acb-aad4-db873dacd2e4 2023-05-15T16:00:40+02:00 Changes in the Deep Western Boundary Current at 53°N Kulan, Nilgun Myers, Paul G. 2012 https://era.library.ualberta.ca/items/b9f816bd-3515-4acb-aad4-db873dacd2e4 https://doi.org/10.7939/R3PN8XW1Z English eng https://era.library.ualberta.ca/items/b9f816bd-3515-4acb-aad4-db873dacd2e4 doi:10.7939/R3PN8XW1Z © 2012 American Meteorological Society Data Assimilation Boundary Currents Ocean Circulation Interannual Variability Meridional Overturning Circulation Thermohaline Circulation Article (Published) 2012 ftunivalberta https://doi.org/10.7939/R3PN8XW1Z 2022-08-22T20:13:24Z Southward transports in the deep western boundary current across 53°N, over 1949–99, are determined from a historical reconstruction. Long-term mean transports, for given water masses, for net southward transport (the southward component of the transport not including recirculation given in parentheses) are 4.7 ± 2.3 Sv (5.1 ± 2.4 Sv) (Sv ≡ 106 m3 s−1) for the Denmark Strait Overflow Water, 6.1 ± 2.7 Sv (6.8 ± 1.7 Sv) for the Iceland–Scotland Overflow Water, 6.5 ± 2.6 Sv (7.1 ± 1.8 Sv) for classical Labrador Sea Water, and 2.3 ± 1.9 Sv (2.7 ± 3.4 Sv) for upper Labrador Sea Water. The estimates take into account seasonal and interannual variability of the isopycnal positions and suggest the importance of including this factor. A strong correlation, 0.91, is found between variability of the total and baroclinic transports (with the barotropic velocity removed) at the annual time scale. This correlation drops to 0.32 if the baroclinic transports are, instead, computed based upon the use of a fixed level of no motion at 1400 m. The Labrador Sea Water layer shows significant variability and enhanced transport during the 1990s but no trend. The deeper layers do show a declining (but nonstatistically significant) trend over the period analyzed, largest in the ISOW layer. The Iceland–Scotland Overflow Water presents a 0.029 Sv yr−1 decline or 1.5 Sv over the 50-yr period, an 18%–22% decrease in its mean transport. Other/Unknown Material Denmark Strait Iceland Labrador Sea University of Alberta: Era - Education and Research Archive |
institution |
Open Polar |
collection |
University of Alberta: Era - Education and Research Archive |
op_collection_id |
ftunivalberta |
language |
English |
topic |
Data Assimilation Boundary Currents Ocean Circulation Interannual Variability Meridional Overturning Circulation Thermohaline Circulation |
spellingShingle |
Data Assimilation Boundary Currents Ocean Circulation Interannual Variability Meridional Overturning Circulation Thermohaline Circulation Kulan, Nilgun Myers, Paul G. Changes in the Deep Western Boundary Current at 53°N |
topic_facet |
Data Assimilation Boundary Currents Ocean Circulation Interannual Variability Meridional Overturning Circulation Thermohaline Circulation |
description |
Southward transports in the deep western boundary current across 53°N, over 1949–99, are determined from a historical reconstruction. Long-term mean transports, for given water masses, for net southward transport (the southward component of the transport not including recirculation given in parentheses) are 4.7 ± 2.3 Sv (5.1 ± 2.4 Sv) (Sv ≡ 106 m3 s−1) for the Denmark Strait Overflow Water, 6.1 ± 2.7 Sv (6.8 ± 1.7 Sv) for the Iceland–Scotland Overflow Water, 6.5 ± 2.6 Sv (7.1 ± 1.8 Sv) for classical Labrador Sea Water, and 2.3 ± 1.9 Sv (2.7 ± 3.4 Sv) for upper Labrador Sea Water. The estimates take into account seasonal and interannual variability of the isopycnal positions and suggest the importance of including this factor. A strong correlation, 0.91, is found between variability of the total and baroclinic transports (with the barotropic velocity removed) at the annual time scale. This correlation drops to 0.32 if the baroclinic transports are, instead, computed based upon the use of a fixed level of no motion at 1400 m. The Labrador Sea Water layer shows significant variability and enhanced transport during the 1990s but no trend. The deeper layers do show a declining (but nonstatistically significant) trend over the period analyzed, largest in the ISOW layer. The Iceland–Scotland Overflow Water presents a 0.029 Sv yr−1 decline or 1.5 Sv over the 50-yr period, an 18%–22% decrease in its mean transport. |
format |
Other/Unknown Material |
author |
Kulan, Nilgun Myers, Paul G. |
author_facet |
Kulan, Nilgun Myers, Paul G. |
author_sort |
Kulan, Nilgun |
title |
Changes in the Deep Western Boundary Current at 53°N |
title_short |
Changes in the Deep Western Boundary Current at 53°N |
title_full |
Changes in the Deep Western Boundary Current at 53°N |
title_fullStr |
Changes in the Deep Western Boundary Current at 53°N |
title_full_unstemmed |
Changes in the Deep Western Boundary Current at 53°N |
title_sort |
changes in the deep western boundary current at 53°n |
publishDate |
2012 |
url |
https://era.library.ualberta.ca/items/b9f816bd-3515-4acb-aad4-db873dacd2e4 https://doi.org/10.7939/R3PN8XW1Z |
genre |
Denmark Strait Iceland Labrador Sea |
genre_facet |
Denmark Strait Iceland Labrador Sea |
op_relation |
https://era.library.ualberta.ca/items/b9f816bd-3515-4acb-aad4-db873dacd2e4 doi:10.7939/R3PN8XW1Z |
op_rights |
© 2012 American Meteorological Society |
op_doi |
https://doi.org/10.7939/R3PN8XW1Z |
_version_ |
1766396681269542912 |