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  • 1
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    Eddy-Scale Variability in the Northeastern Atlantic from RAFOS Floats (2003)
    In:  [Talk] In: EGS-AGU-EUG Joint Assembly, 06.-11.04.2003, Nice, France .
    Details
    Publication Date: 2012-06-13
    Description: Since the late 1990ies, the IfM Kiel and partners have carried out field observations using floats in the Northeastern Atlantic Ocean, achieving unprecedentedly high data densities. Data from RAFOS floats with daily fixes make an eddy-resolving look at the turbulent field possible, in addition to observing the more general circulation. The presentation focusses on the level of the Labrador Sea Water (circa 1500 m), where a distinct difference between the energetic Iceland Basin and the more quiet West European Basin further to the South is found. To point this out, Lagrangian time and length scales, eddy kinetic energy, and diffusivity are derived from the observations. A new, self-contained detection scheme for long-lived eddies in the trajectory data will be presented, featuring fits of auto-regressive processes to identify eddies and their major properties. Analyzing data from two projects (SFB 60,Eurofloat) with these tools reveals a comprehensive view of the dynamics at the given depth between approximately 35 and 65 degrees Northern latitude.
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 2
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    Pathways of Iceland Scotland Overflow Water in the Eastern Subpolar Gyre (2004)
    In:  [Talk] In: CLIVAR Workshop on North Atlantic Thermohaline Circulation Variability, 13.-16.06.2004, Kiel, Germany .
    Details
    Publication Date: 2012-06-11
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 3
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    The extraordinary life of an ordinary Argo float (L'extraordinaire destin d'un flotteur Argo ordinaire) (2007)
    In:  ARGOS Forum, 64 . pp. 18-21.
    Details
    Publication Date: 2016-05-27
    Type: Article , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - without review
  • 4
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    Lagrangian Observations at Mid-Depth in the Western Tropical Atlantic (2004)
    In:  [Talk] In: EGU General Assembly 2004, 25.-30.04.2004, Nice, France .
    Details
    Publication Date: 2012-06-11
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 5
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    A First Look at the Technical Data from APEX Floats (2003)
    In:  [Talk] In: GyroScope Annual Meeting, 01.2003, Santa Cruz de Tenerife .
    Details
    Publication Date: 2012-06-12
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 6
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    Technical Performance of the Floats as their Age Increases (2003)
    In:  [Talk] In: GyroScope Final Meeting, 10.2003, Paris, France .
    Details
    Publication Date: 2012-06-13
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 7
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    Results from float observations in the northeastern Atlantic (2006)
    In:  [Other] In: Seminar at NOAA/PMEL, 06.03, Seattle, Washington, USA .
    Details
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 8
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    On the intermediate circulation in the Iceland Basin (2007)
    Cambridge University Press
    In:  In: Lagrangian analysis and prediction of coastal and ocean dynamics. , ed. by Griffa, A., Kirwan, A. D., Mariano, A. J., Özgökmen, T. and Rossby, T. Cambridge University Press, Cambridge, pp. 81-83.
    Details
    Publication Date: 2012-02-23
    Type: Book chapter , PeerReviewed
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    OceanRep: Book chapter
  • 9
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    Observation of decadal change in the Atlantic meridional overturning circulation using 10 years of continuous transport data (2011)
    AGU (American Geophysical Union)
    In:  Geophysical Research Letters, 38 (24). L24606.
    Details
    Publication Date: 2017-06-20
    Description: The meridional overturning circulation (MOC) represents the main mechanism for the oceanic northward heat transport in the Atlantic, and fluctuations of this circulation are believed to have major impacts on northern hemisphere climate. While numerical ocean and climate models and paleo-records show large variability in this circulation, the use of direct observations of the MOC for detecting climate-timescale changes has proven difficult so far. This report presents the first observational record of MOC measurements that is continuous and sufficiently long to exhibit decadal-scale changes, here a decrease by 20% over the observational period (Jan. 2000–June 2009) and large interannual changes in the flow and its vertical structure. Data are from a mooring array at 16°N (Meridional Overturning Variability Experiment, MOVE). The observed change agrees with the amplitude of multi-decadal natural fluctuations seen in numerical ocean and climate models. Knowledge of the existence and phasing of such internal cycles provides multi-decadal climate predictability. Recently, some numerical model simulations have produced results that show a weakening of the MOC since the 1990's and observational confirmation of this now is a high priority.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2011GL049801
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
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    Lagrangian Observations of the Middepth and Deep Velocity Fields of the Northeastern Atlantic Ocean (2006)
    AMS (American Meteorological Society)
    In:  Journal of Physical Oceanography, 36 (1). pp. 43-63.
    Details
    Publication Date: 2017-11-15
    Description: The circulation of the northeastern Atlantic Ocean at intermediate depths is characterized by watermass transformation processes that involve Iceland–Scotland Overflow Water (ISOW) from the northeast, Labrador Sea Water (LSW) from the west, and Mediterranean Water from the south. Field observations were carried out with 89 eddy-resolving floats (RAFOS and MARVOR types). The data coverage achieved is remarkably high and enables a comprehensive study of the eastern basins between Iceland and the Azores. The trajectories show typical pathways of the water masses involved and the role that the complex bottom topography plays in defining them. The ISOW paths tend to lean against the slopes of the Reykjanes Ridge and Rockall Plateau. Westward escapes through multiple gaps in the ridge are possible, superimposed on a sustained southward flow in the eastern basin along the Mid-Atlantic Ridge. LSW pathways leading to the eastern basins are subject to high variability in flow direction and eddy activity. In addition to a selection of characteristic trajectories, maps of the horizontal distributions of Lagrangian eddy kinetic energy and integral time scales are presented. These reveal distinct areas of intensified mixing in the Iceland Basin, as well as the sharp contrast between the subpolar and subtropical dynamics. A self-contained eddy detection scheme is applied to obtain statistics on individual eddy properties and their abundance. It is suggested that much of the intensified mixing can be related to cyclonic activity, particularly in the subpolar region.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1175/JPO2869.1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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