Water-mass properties and circulation on the west Antarctic Peninsula Continental Shelf in Austral Fall and Winter 2001
Hydrographic measurements made during the US Southern Ocean Global Ocean Ecosystem Dynamics cruises, which took place from April to June and July to September 2001, provide a description of changes in water-mass distributions and circulation patterns in the Marguerite Bay region of the west Antarcti...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
2004
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Online Access: | https://hdl.handle.net/11511/31675 https://doi.org/10.1016/j.dsr2.2004.08.001 |
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ftmetuankair:oai:https://open.metu.edu.tr:11511/31675 2023-05-15T13:04:01+02:00 Water-mass properties and circulation on the west Antarctic Peninsula Continental Shelf in Austral Fall and Winter 2001 Klinck, JM Hofmann, EE Beardsley, RC Salihoğlu, Barış Howard, S 2004-01-01 https://hdl.handle.net/11511/31675 https://doi.org/10.1016/j.dsr2.2004.08.001 unknown DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY Klinck J., Hofmann E., Beardsley R., Salihoglu B., Howard S., "Water-mass properties and circulation on the west Antarctic Peninsula Continental Shelf in Austral Fall and Winter 2001", DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, cilt.51, ss.1925-1946, 2004 doi:10.1016/j.dsr2.2004.08.001 1946 0967-0645 9744285141 1925 https://hdl.handle.net/11511/31675 51 WOS:000226045100002 Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ CC-BY-NC-ND Variability Journal Article 2004 ftmetuankair https://doi.org/10.1016/j.dsr2.2004.08.001 2020-12-11T12:12:09Z Hydrographic measurements made during the US Southern Ocean Global Ocean Ecosystem Dynamics cruises, which took place from April to June and July to September 2001, provide a description of changes in water-mass distributions and circulation patterns in the Marguerite Bay region of the west Antarctic Peninsula continental shelf that result from seasonal variability and offshore forcing by the southern boundary of the Antarctic Circumpolar Current (ACC). The primary seasonal change in water-mass properties is the reduction in Antarctic Surface Water and replacement by a thick Winter Water layer. The primary effect of the ACC is to pump warm (> 1.5degreesC), salty (34.65-34.7), and nutrient-rich Circumpolar Deep Water (CDW) onto the continental shelf below 200m at specific sites that correspond to bathymetric features, such as Marguerite Trough. The CDW intruded onto the continental shelf, moved across shelf, and entered Marguerite Bay. This flow pattern was observed during both cruises, suggesting that onshelf intrusions of CDW are a regular occurrence on this shelf. The number of CDW intrusions observed suggests that 4-6 events can occur in a year. Regions where CDW intrusions occur are characterized by surface waters that are above freezing in winter. Diffusive heat fluxes based on estimated diffusivities are insufficient for the observed rate of temperature decay of CDW intrusions. Localized, bathymetrically controlled vertical mixing is suggested as the primary heat transfer mechanism. The hydrographic and Acoustic Doppler Current Profiler measurements show a southwesterly flowing coastal current along Adelaide Island that enters the north side of Marguerite Bay and exits around Alexander Island. This current, which may result from seasonal, coastal buoyancy forcing, was present in fall and winter, but was better developed in fall. This current may be part of a larger cyclonic gyre that overlies the northern part of the area surveyed during the two cruises. Article in Journal/Newspaper Adelaide Island Alexander Island Antarc* Antarctic Antarctic Peninsula Southern Ocean OpenMETU (Middle East Technical University) Adelaide Island ENVELOPE(-68.914,-68.914,-67.762,-67.762) Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) Antarctic Antarctic Peninsula Austral Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) Southern Ocean The Antarctic Deep Sea Research Part II: Topical Studies in Oceanography 51 17-19 1925 1946 |
institution |
Open Polar |
collection |
OpenMETU (Middle East Technical University) |
op_collection_id |
ftmetuankair |
language |
unknown |
topic |
Variability |
spellingShingle |
Variability Klinck, JM Hofmann, EE Beardsley, RC Salihoğlu, Barış Howard, S Water-mass properties and circulation on the west Antarctic Peninsula Continental Shelf in Austral Fall and Winter 2001 |
topic_facet |
Variability |
description |
Hydrographic measurements made during the US Southern Ocean Global Ocean Ecosystem Dynamics cruises, which took place from April to June and July to September 2001, provide a description of changes in water-mass distributions and circulation patterns in the Marguerite Bay region of the west Antarctic Peninsula continental shelf that result from seasonal variability and offshore forcing by the southern boundary of the Antarctic Circumpolar Current (ACC). The primary seasonal change in water-mass properties is the reduction in Antarctic Surface Water and replacement by a thick Winter Water layer. The primary effect of the ACC is to pump warm (> 1.5degreesC), salty (34.65-34.7), and nutrient-rich Circumpolar Deep Water (CDW) onto the continental shelf below 200m at specific sites that correspond to bathymetric features, such as Marguerite Trough. The CDW intruded onto the continental shelf, moved across shelf, and entered Marguerite Bay. This flow pattern was observed during both cruises, suggesting that onshelf intrusions of CDW are a regular occurrence on this shelf. The number of CDW intrusions observed suggests that 4-6 events can occur in a year. Regions where CDW intrusions occur are characterized by surface waters that are above freezing in winter. Diffusive heat fluxes based on estimated diffusivities are insufficient for the observed rate of temperature decay of CDW intrusions. Localized, bathymetrically controlled vertical mixing is suggested as the primary heat transfer mechanism. The hydrographic and Acoustic Doppler Current Profiler measurements show a southwesterly flowing coastal current along Adelaide Island that enters the north side of Marguerite Bay and exits around Alexander Island. This current, which may result from seasonal, coastal buoyancy forcing, was present in fall and winter, but was better developed in fall. This current may be part of a larger cyclonic gyre that overlies the northern part of the area surveyed during the two cruises. |
format |
Article in Journal/Newspaper |
author |
Klinck, JM Hofmann, EE Beardsley, RC Salihoğlu, Barış Howard, S |
author_facet |
Klinck, JM Hofmann, EE Beardsley, RC Salihoğlu, Barış Howard, S |
author_sort |
Klinck, JM |
title |
Water-mass properties and circulation on the west Antarctic Peninsula Continental Shelf in Austral Fall and Winter 2001 |
title_short |
Water-mass properties and circulation on the west Antarctic Peninsula Continental Shelf in Austral Fall and Winter 2001 |
title_full |
Water-mass properties and circulation on the west Antarctic Peninsula Continental Shelf in Austral Fall and Winter 2001 |
title_fullStr |
Water-mass properties and circulation on the west Antarctic Peninsula Continental Shelf in Austral Fall and Winter 2001 |
title_full_unstemmed |
Water-mass properties and circulation on the west Antarctic Peninsula Continental Shelf in Austral Fall and Winter 2001 |
title_sort |
water-mass properties and circulation on the west antarctic peninsula continental shelf in austral fall and winter 2001 |
publisher |
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY |
publishDate |
2004 |
url |
https://hdl.handle.net/11511/31675 https://doi.org/10.1016/j.dsr2.2004.08.001 |
long_lat |
ENVELOPE(-68.914,-68.914,-67.762,-67.762) ENVELOPE(-69.895,-69.895,-71.287,-71.287) ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.000,-68.000,-68.500,-68.500) |
geographic |
Adelaide Island Alexander Island Antarctic Antarctic Peninsula Austral Marguerite Marguerite Bay Southern Ocean The Antarctic |
geographic_facet |
Adelaide Island Alexander Island Antarctic Antarctic Peninsula Austral Marguerite Marguerite Bay Southern Ocean The Antarctic |
genre |
Adelaide Island Alexander Island Antarc* Antarctic Antarctic Peninsula Southern Ocean |
genre_facet |
Adelaide Island Alexander Island Antarc* Antarctic Antarctic Peninsula Southern Ocean |
op_relation |
Klinck J., Hofmann E., Beardsley R., Salihoglu B., Howard S., "Water-mass properties and circulation on the west Antarctic Peninsula Continental Shelf in Austral Fall and Winter 2001", DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, cilt.51, ss.1925-1946, 2004 doi:10.1016/j.dsr2.2004.08.001 1946 0967-0645 9744285141 1925 https://hdl.handle.net/11511/31675 51 WOS:000226045100002 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.dsr2.2004.08.001 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
51 |
container_issue |
17-19 |
container_start_page |
1925 |
op_container_end_page |
1946 |
_version_ |
1766350205858349056 |