Offshore transport of dense water from the East Greenland Shelf
Author Posting. © American Meteorological Society, 2014. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 44 (2014): 229–245, doi:10.1175/JPO-D-12-0218.1. Da...
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Online Access: | https://hdl.handle.net/1912/6703 |
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/6703 2023-05-15T16:00:39+02:00 Offshore transport of dense water from the East Greenland Shelf Harden, Benjamin E. Pickart, Robert S. Renfrew, Ian A. 2014-01 application/pdf https://hdl.handle.net/1912/6703 en_US eng American Meteorological Society https://doi.org/10.1175/JPO-D-12-0218.1 Journal of Physical Oceanography 44 (2014): 229–245 https://hdl.handle.net/1912/6703 doi:10.1175/JPO-D-12-0218.1 Journal of Physical Oceanography 44 (2014): 229–245 doi:10.1175/JPO-D-12-0218.1 Geographic location/entity Continental shelf/slope Circulation/ Dynamics Meridional overturning circulation Upwelling/downwelling Atm/Ocean Structure/ Phenomena Eddies Extreme events Physical Meteorology and Climatology Air-sea interaction Article 2014 ftwhoas https://doi.org/10.1175/JPO-D-12-0218.1 2022-05-28T22:59:07Z Author Posting. © American Meteorological Society, 2014. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 44 (2014): 229–245, doi:10.1175/JPO-D-12-0218.1. Data from a mooring deployed at the edge of the East Greenland shelf south of Denmark Strait from September 2007 to October 2008 are analyzed to investigate the processes by which dense water is transferred off the shelf. It is found that water denser than 27.7 kg m−3—as dense as water previously attributed to the adjacent East Greenland Spill Jet—resides near the bottom of the shelf for most of the year with no discernible seasonality. The mean velocity in the central part of the water column is directed along the isobaths, while the deep flow is bottom intensified and veers offshore. Two mechanisms for driving dense spilling events are investigated, one due to offshore forcing and the other associated with wind forcing. Denmark Strait cyclones propagating southward along the continental slope are shown to drive off-shelf flow at their leading edges and are responsible for much of the triggering of individual spilling events. Northerly barrier winds also force spilling. Local winds generate an Ekman downwelling cell. Nonlocal winds also excite spilling, which is hypothesized to be the result of southward-propagating coastally trapped waves, although definitive confirmation is still required. The combined effect of the eddies and barrier winds results in the strongest spilling events, while in the absence of winds a train of eddies causes enhanced spilling. The authors wish to thank Paula Fratantoni, Frank Bahr, and Dan Torres for processing the mooring data. The mooring array was capably deployed by the crew of the R/V Arni Fridriksson and recovered by the crew of the R/V Knorr. We thank Hedinn Valdimarsson for his assistance in the field work. Ken Brink provided valuable insights regarding the dynamics of shelf ... Article in Journal/Newspaper Denmark Strait East Greenland Greenland Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Greenland Journal of Physical Oceanography 44 1 229 245 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Geographic location/entity Continental shelf/slope Circulation/ Dynamics Meridional overturning circulation Upwelling/downwelling Atm/Ocean Structure/ Phenomena Eddies Extreme events Physical Meteorology and Climatology Air-sea interaction |
spellingShingle |
Geographic location/entity Continental shelf/slope Circulation/ Dynamics Meridional overturning circulation Upwelling/downwelling Atm/Ocean Structure/ Phenomena Eddies Extreme events Physical Meteorology and Climatology Air-sea interaction Harden, Benjamin E. Pickart, Robert S. Renfrew, Ian A. Offshore transport of dense water from the East Greenland Shelf |
topic_facet |
Geographic location/entity Continental shelf/slope Circulation/ Dynamics Meridional overturning circulation Upwelling/downwelling Atm/Ocean Structure/ Phenomena Eddies Extreme events Physical Meteorology and Climatology Air-sea interaction |
description |
Author Posting. © American Meteorological Society, 2014. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 44 (2014): 229–245, doi:10.1175/JPO-D-12-0218.1. Data from a mooring deployed at the edge of the East Greenland shelf south of Denmark Strait from September 2007 to October 2008 are analyzed to investigate the processes by which dense water is transferred off the shelf. It is found that water denser than 27.7 kg m−3—as dense as water previously attributed to the adjacent East Greenland Spill Jet—resides near the bottom of the shelf for most of the year with no discernible seasonality. The mean velocity in the central part of the water column is directed along the isobaths, while the deep flow is bottom intensified and veers offshore. Two mechanisms for driving dense spilling events are investigated, one due to offshore forcing and the other associated with wind forcing. Denmark Strait cyclones propagating southward along the continental slope are shown to drive off-shelf flow at their leading edges and are responsible for much of the triggering of individual spilling events. Northerly barrier winds also force spilling. Local winds generate an Ekman downwelling cell. Nonlocal winds also excite spilling, which is hypothesized to be the result of southward-propagating coastally trapped waves, although definitive confirmation is still required. The combined effect of the eddies and barrier winds results in the strongest spilling events, while in the absence of winds a train of eddies causes enhanced spilling. The authors wish to thank Paula Fratantoni, Frank Bahr, and Dan Torres for processing the mooring data. The mooring array was capably deployed by the crew of the R/V Arni Fridriksson and recovered by the crew of the R/V Knorr. We thank Hedinn Valdimarsson for his assistance in the field work. Ken Brink provided valuable insights regarding the dynamics of shelf ... |
format |
Article in Journal/Newspaper |
author |
Harden, Benjamin E. Pickart, Robert S. Renfrew, Ian A. |
author_facet |
Harden, Benjamin E. Pickart, Robert S. Renfrew, Ian A. |
author_sort |
Harden, Benjamin E. |
title |
Offshore transport of dense water from the East Greenland Shelf |
title_short |
Offshore transport of dense water from the East Greenland Shelf |
title_full |
Offshore transport of dense water from the East Greenland Shelf |
title_fullStr |
Offshore transport of dense water from the East Greenland Shelf |
title_full_unstemmed |
Offshore transport of dense water from the East Greenland Shelf |
title_sort |
offshore transport of dense water from the east greenland shelf |
publisher |
American Meteorological Society |
publishDate |
2014 |
url |
https://hdl.handle.net/1912/6703 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Denmark Strait East Greenland Greenland |
genre_facet |
Denmark Strait East Greenland Greenland |
op_source |
Journal of Physical Oceanography 44 (2014): 229–245 doi:10.1175/JPO-D-12-0218.1 |
op_relation |
https://doi.org/10.1175/JPO-D-12-0218.1 Journal of Physical Oceanography 44 (2014): 229–245 https://hdl.handle.net/1912/6703 doi:10.1175/JPO-D-12-0218.1 |
op_doi |
https://doi.org/10.1175/JPO-D-12-0218.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
44 |
container_issue |
1 |
container_start_page |
229 |
op_container_end_page |
245 |
_version_ |
1766396654995374080 |