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  • 2000-2004  (9)
  • 2002  (9)
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  • 2000-2004  (9)
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  • 1
    Book
    Book
    Deep ocean ventilation through Antarctic intermediate layers (DOVETAIL) (2002)
    Oxford [u.a.] : Pergamon
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    Type of Medium: Book
    Pages: III S., S. 4711 - 4886 , zahlr. graph. Darst., Kt.
    Series Statement: Deep-sea research 49,21
    Language: English
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  • 2
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    The International DOVETAIL Program (2002)
    In:  EPIC3Deep-Sea Research II, 49(21), pp. 4711-4714
    Details
    Publication Date: 2019-07-16
    Description: The "Deep Ocean Ventilation Through Antarctic Intermediate Layers"(DOVETAIL) program is an international field and modeling study of thedense deep and bottom waters of the northwestern Weddell Sea. Aprimary program goal has been to estimate the volume transport andpathways of these waters, long considered to be a major source ofAntarctic Bottom Water, as they escape from the Weddell Sea over andthrough the South Scotia Ridge into the Scotia Sea. Corollary goalsare to assess modification of the stratification during passage throughthe narrow, steep-sided and irregular channels that transect the Ridge.The program has evolved, since its start in 1997 as a primarily process-oriented project, into a multiyear observational study of the northwesternWeddell Sea-southern Scotia Sea including the Weddell-ScotiaConfluence region. An additional program goal has, therefore, becomethe estimation of interannual variability in the physical system. Thisvolume contains a collection of papers that present recent field andmodel-derived results from the DOVETAIL program.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 3
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    Movements of adult male southern elephant seals from King George Island observed by satellite telemetry (2002)
    In:  EPIC3In: Dehnhard, M. & Hofer, H. (eds), 4th International Symposium on Physiology and Behaviour of Wild and Zoo animals, Berlin. Advances in Ethology:68, 37, ISSN: 0301-2808
    Details
    Publication Date: 2019-07-16
    Description: The migratory behaviour of adult male southern elephant seals, Mirounga leonina, from King George Island was studied in relation to sea ice coverage. Fourteen animals were immobilzed and fitted with satellite linked transmitters (Telonics/Wildlife Computers, USA) after the annual moult at their southernmost breeding colony at Stranger Point, King George Island, South Shetland Islands, from March to May 2000. The seals were tracked by Service ARGOS (Toulouse/France) for up to 12 months until March 2001. Daily data of sea ice coverage were derived from the Special Sensor Microwave/Imager (SSM/I) of the Defence Meteorological Satellite Program (DMSP).The bulls moved south-eastward along the shelf margin east of the Antarctic Peninsula reaching their southernmost locations in the interior pack ice of the Weddell Sea in May 2000.Here they concentrated their foraging close to the northern sill of the Filchner Trough. This region corresponds to a divergence of the Antarctic Coastal Current which forms the southern limb of the Weddell Gyre. Upwelling in this area might cause vertical transport of organic material which correlates with increased prey availability for top predators through food web linkages. In August 2000 the remaining bulls with functional transmitters returned northwards to their breeding sites, mainly King George Island.The migration routes of the bulls differ considerably from those of cows and weaned pups of both sexes which moved westward from King George Island into the Pacific sector of the Antarctic Ocean as revealed in a previous tracking study. It needs to be verified whether such separation is maintained within and between years.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 4
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    Simulations of ice-ocean dynamics in the Weddell Sea. 2. Interannual variability 1985 - 1993 (2002)
    In:  EPIC3Journal of Geophysical ResearchC3), 107
    Details
    Publication Date: 2019-07-16
    Description: Investigations of sea ice-ocean interaction on the continental shelf in the southwestern Weddell Sea reveal a strong correlation between fluctuations of atmospheric forcing and the variability of sea ice formation.Anomalies of meridional wind stress in the inner Weddell Sea are consistent with the phase of the Antarctic Circumpolar Wave (ACW).Positive anomalies of northward wind stress cause an increase of sea ice export in the same, and of sea ice formation in the following year leading to an increased production of High Salinity Shelf Water.Driven by a varying zonal density distribution over the continental shelf, the circulation in the Filchner-Ronne Ice Shelf cavity fluctuates between two modes, each of which features a characteristic distribution of basal freezing and melting regions.Thus, signals of interannual atmospheric variability propagate into the deep ocean and the sub-ice shelf cavities.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 5
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    On the transport, variability and origin of dense water masses crossing the South Scotia Ridge (2002)
    In:  EPIC3Deep-Sea Research II, 49, pp. 4807-4825, ISSN: 0967-0645
    Details
    Publication Date: 2019-07-16
    Description: The deep Scotia Sea is filled with ventilated Weddell Sea Deep Water.This in turn is an essential contributor to the ventilation of the World Ocean abyss.Depending on the formation process and/or its location along the Weddell Seaperiphery, deep and bottom water masses follow different routes to crossthe South Scotia Ridge. A primitive equation, hydrostatic, terrain-followingcoordinate ocean general circulation model (BRIOS-1) is used to investigatethe water mass export from the Weddell Sea. The model is circumpolarfocusing on the Weddell Sea, with particulary high resolution (~ 20 km)in the DOVETAIL area. 24 Sv of eastward Weddell Sea Deep Watertransport is found in the northern limb of the Weddell Gyre across 44W.Export rates of Weddell Sea Deep Water through gaps in theSouth Scotia Ridge are estimated to 6.4 Sv with a semi-annual cycleof +- 0.6 Sv which can be correlated to atmospheric cyclone activity andWeddell Gyre strength.Sensitivity studies considering extreme sea ice conditions in the WeddellSea show higher (lower) exports in years of minimum (maximum) ice extent.Lagrangian particle trajectories illustrate the pathways of water massesfrom the inner Weddell Sea into the Scotia Sea through various gaps inthe South Scotia Ridge.They highlight the existing flow divergence on the northwestern continentalshelf with one branch entering Bransfield Strait and the other continuingeastwards subsequently filling the deep Scotia and Weddell seas.Water masses flowing through the major gaps originate from thesouthwestern and southeastern Weddell Sea continental shelves.However, water masses formed east of the Weddell Sea (e.g., Prydz Bay)also seem to feed the deep Scotia Sea, since a large portion of floatsflowing northward through the gaps of the South Scotia Ridge have beenin contact with the mixed layer processes outside the inner Weddell Sea.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 6
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    On the near-bottom variability in the northwestern Weddell Sea (2002)
    In:  EPIC3Deep-Sea Research II, Vol. 49, 21, pp., pp. 4767-4790
    Details
    Publication Date: 2019-07-16
    Description: The thermohaline data of the first Brazilian hydrographiccruise to the northwestern Weddell Sea (AR XVIII) isdescribed. Favourable ice conditions allowed a dense stationcoverage of the area including the main pathways for WeddellSea deep and bottom waters. The results are compared withthe 1998-data of the German cruise ANT XV/4 and otherhistorical data. An interannual near-bottom variability wasdiscovered and related rather to fluctuations in theformation rate of cold bottom water in the western WeddellSea than to a long-term trend. The calculated fluctuationbased on the comparison agrees well with the formationvariance determined from mooring observations off the tipof the Antarctic Peninsula. The observed variability hasconsequences for the water mass export across the SouthScotia Ridge, as the absence of the colder/fresher/lighterWeddell Sea Bottom Water south of South Orkney Plateauduring AR XVIII might be related to a reduceed ventilationof the deep Scotia Sea. The results of this study supportongoing efforts to establish a long-term monitoring of thisregion with global importance.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 7
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    Tidal mixing in the southern Weddell Sea: results from a three-dimensional model (2002)
    In:  EPIC3Journal of Physical Oceanography, 32(7), pp. 2151-2170
    Details
    Publication Date: 2019-07-16
    Description: A three-dimensional primitive equation ocean model is used to study themagnitude and distribution of tidal mixing in the southern WeddellSea. The contributions of (a) semidiurnal barotropic constituentsM2 and S2, (b) internal tides, and (c)diurnal barotropic tides are considered. Computedelevation co-tidal charts are generally consistent with our knowledgeand observations for the region. The model reproduces maximum semidiurnal tidalelevations of about 1.6 m and 1.0 m for M2 and S2, respectively. Aninternal tide of moderate strength is generated over the slope,propagating in the along-slope direction but rapidly dissipating. Onthe continental shelf, a thick benthic boundary layer (150 m) developsdue to the proximity of the critical latitude for the M2constituent. Typical M2 and S2 baroclinictidal currents at the shelf break are 10 cm/s and 6 cm/s, respectively.In general, the tidal currents produce strong mixing in the bottom boundary layer at the shelf breakand on the shelf leading to high vertical eddy viscosity/diffusivitycoefficients of up to 0.1 m2/s. Both summer and winter stratification are investigated;increased mixing near the surface is found in summer. The model results suggestthat tides contribute significantly to the turbulent mixing at theshelf break of the southern Weddell Sea.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 8
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    Interannual variability of the circulation in the Filchner-Ronne Ice Shelf cavity (2002)
    In:  EPIC3Ice and Climate News, 3, pp. 3-4
    Details
    Publication Date: 2019-07-16
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , notRev
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  • 9
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    Simulation of ice-ocean dynamics in the Weddell Sea. Part I: Model configuration and validation (2002)
    In:  EPIC3Journal of Geophysical ResearchC3), 107
    Details
    Publication Date: 2019-07-16
    Description: In the framework of the Bremerhaven Regional Ice Ocean Simulations (BRIOS) a coupled sea ice-ocean model, based on a dynamic-thermodynamic sea ice-model and the S-coordinate Primitive Equation Model (SPEM) has been developed.The model is run on a circumpolar grid which is focussed on the Weddell Sea.It includes the major Antarctic ice shelves; ice shelf-ocean interaction is described by the sea ice-model's thermodynamic component.Numerical simulations are forced with 6-hourly data of the ECMWF-reanalysis of the period 1985-1993 and validated against observations of hydrography as well as sea ice extent, thickness and drift.Qualitatively and quantitatively, a good agreement with observations is achieved.The basin-wide circulation features a double-cell structure of the Weddell Gyre with maximum transports close to recent observations.Summer sea ice coverage is underestimated but winter ice extent as well as sea ice thickness and drift are well reproduced.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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