Water-mass properties and circulation on the west Antarctic Peninsula Continental Shelf in Austral Fall and Winter 2001

Date

2004-01-01

Author

Klinck, JM
Hofmann, EE
Beardsley, RC
Salihoğlu, Barış
Howard, S

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

162
views

0
downloads

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.

Subject Keywords

Variability

URI

https://hdl.handle.net/11511/31675

Journal

DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY

DOI

https://doi.org/10.1016/j.dsr2.2004.08.001

Collections

Graduate School of Marine Sciences, Article

Suggestions

OpenMETU
Core

Climate variability and deep water mass characteristics in the Aegean Sea Georgiou, S.; Mantziafou, A.; Sofianos, S.; Gertman, I.; Ozsoy, E.; Somot, S.; Vervatis, V. (2015-01-15) The main objective of this study is to investigate the variability of the thermohaline characteristics of the deep-water masses in the Aegean Sea and the possible impact of the regional atmospheric forcing variability by analyzing the available oceanographic and atmospheric datasets for the period of 1960-2012. During this period the variability of the deep water characteristics of the Aegean sub-basins is found to be very large as well as the diversity of the deep water characteristics among the sub-basins...
Coupled physical and biochemical data driven simulations of Black Sea in spring-summer: real-time forecast and data assimilation Besiktepe, ST (2002-12-06) Data driven simulations in the Black Sea based upon observations during May-June 2001 in the SW part of the basin and coupled 3D physical and biochemical models have been carried out. The model was initialised with the data obtained during 22-28 May, 2001 and ran until 15 June, 2001. The data obtained in the second leg during 12-18 June, 2001 was assimilated into the model. At the time of the assimilation, the model forecast and the data were also compared. Quantitative and qualitative comparisons of the co...
Surface circulation in the Alboran Sea (western Mediterranean) inferred from remotely sensed data Renault, L.; Oguz, T.; Pascual, A.; Vizoso, G.; Tintore, J. (2012-08-03) In this study, for the first time at regional scale, the combined use of remote sensing data (altimetry and sea surface temperature records) provides a description of the persistent, recurrent and transient circulation regimes of the Alboran Sea circulation. The analysis of 936 altimeter-derived weekly absolute dynamic topography (ADT) and surface geostrophic current maps for 1993-2010 reveals the presence of a dominant annual signal and of two interannual modes of variability. The winter-spring phase is ch...
Observations on the Rim Current structure, CIW formation and transport in the western Black Sea Oguz, T; Besiktepe, S (1999-10-01) CTD and ADCP measurements together with a sequence of satellite images indicate pronounced current meandering and eddy activity in the western Black Sea during April 1993. The Rim Current is identified as a well-defined meandering jet stream confined over the steepest topographic slope and associated cyclonic-anticyclonic eddy pairs located on both its sides. It has a form of highly energetic and unstable flow system, which, as it propagates cyclonically along the periphery of the basin, is modified in char...
Dust transport over the eastern Mediterranean derived from Total Ozone Mapping Spectrometer, Aerosol Robotic Network, and surface measurements Kalivitis, N.; Gerasopoulos, E.; Vrekoussis, M.; Kouvarakis, G.; Kubilay, N.; Hatzianastassiou, N.; Vardavas, I.; Mihalopoulos, N. (2007-02-07) Multiyear surface PM10 measurements performed on Crete Island, Greece, have been used in conjunction with satellite ( Total Ozone Mapping Spectrometer ( TOMS)) and ground-based remote sensing measurements ( Aerosol Robotic Network (AERONET)) to enhance our understanding of the evolution of mineral dust events over the eastern Mediterranean. An analysis of southerly air masses at altitudes of 1000 and 3000 m over a 5 year period (2000-2005), showed that dust can potentially arrive over Crete, either simultan...

Citation Formats

J. Klinck, E. Hofmann, R. Beardsley, B. Salihoğlu, and S. Howard, “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, pp. 1925–1946, 2004, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31675.