Boundary circulation at the exit of the Labrador Sea
The deep circulation and related transports of the southern Labrador Sea are determined from direct current observations from ship surveys and a moored current-meter array. The measurements covered a time span from summer 1997 to 1999 and show a well-defined deep boundary current extending approxima...
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ftoceanrep:oai:oceanrep.geomar.de:4061 2023-05-15T16:00:38+02:00 Boundary circulation at the exit of the Labrador Sea Fischer, Jürgen Schott, Friedrich Dengler, Marcus 2004 text https://oceanrep.geomar.de/id/eprint/4061/ https://oceanrep.geomar.de/id/eprint/4061/1/Fischer.pdf https://doi.org/10.1175/1520-0485(2004)034<1548:BCATEO>2.0.CO;2 en eng AMS (American Meteorological Society) https://oceanrep.geomar.de/id/eprint/4061/1/Fischer.pdf Fischer, J. , Schott, F. and Dengler, M. (2004) Boundary circulation at the exit of the Labrador Sea. Open Access Journal of Physical Oceanography, 34 . pp. 1548-1570. DOI 10.1175/1520-0485(2004)034<1548:BCATEO>2.0.CO;2 <https://doi.org/10.1175/1520-0485%282004%29034%3C1548%3ABCATEO%3E2.0.CO%3B2>. doi:10.1175/1520-0485(2004)034<1548:BCATEO>2.0.CO;2 info:eu-repo/semantics/openAccess Article PeerReviewed 2004 ftoceanrep https://doi.org/10.1175/1520-0485(2004)034<1548:BCATEO>2.0.CO;2 2023-04-07T14:48:56Z The deep circulation and related transports of the southern Labrador Sea are determined from direct current observations from ship surveys and a moored current-meter array. The measurements covered a time span from summer 1997 to 1999 and show a well-defined deep boundary current extending approximately out to the 3300-m depth contour and weak reverse currents farther offshore. The flow has a strong barotropic component, and significant baroclinic flow is only found in the shallow Labrador Current at the shelf break and associated with a deep core of Denmark Strait Overflow Water. The total deep-water transport below σΘ = 27.74 kg m−3 was 26 ± 5 Sv (Sv ≡ 106 m3 s−1) comprising Labrador Sea Water (LSW), Gibbs Fracture Zone Water (GFZW), and Denmark Strait Overflow Water (DSOW). Intraseasonal variability of the flow and transport was high, ranging from 15 to 35 Sv, and the annual means differed by 17%. A seasonal cycle is confined to the shallow Labrador Current; in its deeper part, where the mean flow is still strong, no obvious seasonality could be detected. The transport of the interior anticyclonic recirculation was estimated from lowered acoustic Doppler current profiler stations and geostrophy, yielding about 9 Sv. Thus, the net deep-water outflow from the Labrador Sea was about 17 Sv. The baroclinic transport of GFZW and DSOW referenced to the depth of the isopycnal σΘ = 27.80 kg m−3 is only about one-third of the total transport in these layers. Longer-term variations of the total transports are not represented well by the baroclinic contribution. Article in Journal/Newspaper Denmark Strait Labrador Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The deep circulation and related transports of the southern Labrador Sea are determined from direct current observations from ship surveys and a moored current-meter array. The measurements covered a time span from summer 1997 to 1999 and show a well-defined deep boundary current extending approximately out to the 3300-m depth contour and weak reverse currents farther offshore. The flow has a strong barotropic component, and significant baroclinic flow is only found in the shallow Labrador Current at the shelf break and associated with a deep core of Denmark Strait Overflow Water. The total deep-water transport below σΘ = 27.74 kg m−3 was 26 ± 5 Sv (Sv ≡ 106 m3 s−1) comprising Labrador Sea Water (LSW), Gibbs Fracture Zone Water (GFZW), and Denmark Strait Overflow Water (DSOW). Intraseasonal variability of the flow and transport was high, ranging from 15 to 35 Sv, and the annual means differed by 17%. A seasonal cycle is confined to the shallow Labrador Current; in its deeper part, where the mean flow is still strong, no obvious seasonality could be detected. The transport of the interior anticyclonic recirculation was estimated from lowered acoustic Doppler current profiler stations and geostrophy, yielding about 9 Sv. Thus, the net deep-water outflow from the Labrador Sea was about 17 Sv. The baroclinic transport of GFZW and DSOW referenced to the depth of the isopycnal σΘ = 27.80 kg m−3 is only about one-third of the total transport in these layers. Longer-term variations of the total transports are not represented well by the baroclinic contribution. |
format |
Article in Journal/Newspaper |
author |
Fischer, Jürgen Schott, Friedrich Dengler, Marcus |
spellingShingle |
Fischer, Jürgen Schott, Friedrich Dengler, Marcus Boundary circulation at the exit of the Labrador Sea |
author_facet |
Fischer, Jürgen Schott, Friedrich Dengler, Marcus |
author_sort |
Fischer, Jürgen |
title |
Boundary circulation at the exit of the Labrador Sea |
title_short |
Boundary circulation at the exit of the Labrador Sea |
title_full |
Boundary circulation at the exit of the Labrador Sea |
title_fullStr |
Boundary circulation at the exit of the Labrador Sea |
title_full_unstemmed |
Boundary circulation at the exit of the Labrador Sea |
title_sort |
boundary circulation at the exit of the labrador sea |
publisher |
AMS (American Meteorological Society) |
publishDate |
2004 |
url |
https://oceanrep.geomar.de/id/eprint/4061/ https://oceanrep.geomar.de/id/eprint/4061/1/Fischer.pdf https://doi.org/10.1175/1520-0485(2004)034<1548:BCATEO>2.0.CO;2 |
genre |
Denmark Strait Labrador Sea |
genre_facet |
Denmark Strait Labrador Sea |
op_relation |
https://oceanrep.geomar.de/id/eprint/4061/1/Fischer.pdf Fischer, J. , Schott, F. and Dengler, M. (2004) Boundary circulation at the exit of the Labrador Sea. Open Access Journal of Physical Oceanography, 34 . pp. 1548-1570. DOI 10.1175/1520-0485(2004)034<1548:BCATEO>2.0.CO;2 <https://doi.org/10.1175/1520-0485%282004%29034%3C1548%3ABCATEO%3E2.0.CO%3B2>. doi:10.1175/1520-0485(2004)034<1548:BCATEO>2.0.CO;2 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1175/1520-0485(2004)034<1548:BCATEO>2.0.CO;2 |
_version_ |
1766396637781950464 |