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  • English  (4)
  • 2005-2009  (4)
  • 1
    Online Resource
    Online Resource
    Southern Ocean overturning across streamlines in an eddying simulation of the Antarctic Circumpolar Current
    Copernicus GmbH ; 2007
    In:  Ocean Science Vol. 3, No. 4 ( 2007-12-19), p. 491-507
    Details
    In: Ocean Science, Copernicus GmbH, Vol. 3, No. 4 ( 2007-12-19), p. 491-507
    Abstract: Abstract. An eddying global model is used to study the characteristics of the Antarctic Circumpolar Current (ACC) in a streamline-following framework. Previous model-based estimates of the meridional circulation were calculated using zonal averages: this method leads to a counter-intuitive poleward circulation of the less dense waters, and underestimates the eddy effects. We show that on the contrary, the upper ocean circulation across streamlines agrees with the theoretical view: an equatorward mean flow partially cancelled by a poleward eddy mass flux. Two model simulations, in which the buoyancy forcing above the ACC changes from positive to negative, suggest that the relationship between the residual meridional circulation and the surface buoyancy flux is not as straightforward as assumed by the simplest theoretical models: the sign of the residual circulation cannot be inferred from the surface buoyancy forcing only. Among the other processes that likely play a part in setting the meridional circulation, our model results emphasize the complex three-dimensional structure of the ACC (probably not well accounted for in streamline-averaged, two-dimensional models) and the distinct role of temperature and salinity in the definition of the density field. Heat and salt transports by the time-mean flow are important even across time-mean streamlines. Heat and salt are balanced in the ACC, the model drift being small, but the nonlinearity of the equation of state cannot be ignored in the density balance.
    Type of Medium: Online Resource
    ISSN: 1812-0792
    URL: Article
    DOI: 10.5194/os-3-491-2007
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2007
    detail.hit.zdb_id: 2183769-7
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  • 2
    Online Resource
    Online Resource
    Influence of numerical schemes on current-topography interactions in 1/4° global ocean simulations
    Copernicus GmbH ; 2007
    In:  Ocean Science Vol. 3, No. 4 ( 2007-12-20), p. 509-524
    Details
    In: Ocean Science, Copernicus GmbH, Vol. 3, No. 4 ( 2007-12-20), p. 509-524
    Abstract: Abstract. The combined use of partial steps and of an energy-enstrophy conserving momentum advection scheme was shown by Barnier et al. (2006) to yield substantial improvements in the surface solution of the DRAKKAR ¼° global sea-ice/ocean model. The present study extends this investigation below the surface with a special focus on the Atlantic and reveals many improvements there as well: e.g. more realistic path, structure and transports of major currents (Gulf Stream, North Atlantic Current, Confluence region, Zapiola anticyclone), behavior of shedded rings, narrower subsurface boundary currents, stronger mean and eddy flows (MKE and EKE) at depth, beneficial enhancement of cyclonic (anticyclonic) flows around topographic depressions (mountains). Interestingly, adding a no-slip boundary condition to this improved model setup cancels most of these improvements, bringing back the biases diagnosed without the improved momentum advection scheme and partial steps (these biases are typical of other models at comparable or higher resolutions). This shows that current-topography interactions and full-depth eddy-admitting model solutions can be seriously deteriorated by near-bottom sidewall friction, either explicit or inherent to inadequate numerical schemes.
    Type of Medium: Online Resource
    ISSN: 1812-0792
    URL: Article
    DOI: 10.5194/os-3-509-2007
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2007
    detail.hit.zdb_id: 2183769-7
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  • 3
    Online Resource
    Online Resource
    Evaluation of high‐resolution sea ice models on the basis of statistical and scaling properties of Arctic sea ice drift and deformation
    American Geophysical Union (AGU) ; 2009
    In:  Journal of Geophysical Research: Oceans Vol. 114, No. C8 ( 2009-08)
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 114, No. C8 ( 2009-08)
    Abstract: Sea ice drift and deformation from models are evaluated on the basis of statistical and scaling properties. These properties are derived from two observation data sets: the RADARSAT Geophysical Processor System (RGPS) and buoy trajectories from the International Arctic Buoy Program (IABP). Two simulations obtained with the Louvain‐la‐Neuve Ice Model (LIM) coupled to a high‐resolution ocean model and a simulation obtained with the Los Alamos Sea Ice Model (CICE) were analyzed. Model ice drift compares well with observations in terms of large‐scale velocity field and distributions of velocity fluctuations although a significant bias on the mean ice speed is noted. On the other hand, the statistical properties of ice deformation are not well simulated by the models: (1) The distributions of strain rates are incorrect: RGPS distributions of strain rates are power law tailed, i.e., exhibit “wild randomness,” whereas models distributions remain in the Gaussian attraction basin, i.e., exhibit “mild randomness.” (2) The models are unable to reproduce the spatial and temporal correlations of the deformation fields: In the observations, ice deformation follows spatial and temporal scaling laws that express the heterogeneity and the intermittency of deformation. These relations do not appear in simulated ice deformation. Mean deformation in models is almost scale independent. The statistical properties of ice deformation are a signature of the ice mechanical behavior. The present work therefore suggests that the mechanical framework currently used by models is inappropriate. A different modeling framework based on elastic interactions could improve the representation of the statistical and scaling properties of ice deformation.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2008JC005182
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2009
    detail.hit.zdb_id: 161666-3
    SSG: 16,13
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  • 4
    Online Resource
    Online Resource
    A comprehensive strategy for the subtyping of patients with Fanconi anaemia: conclusions from the Spanish Fanconi Anemia Research Network
    BMJ ; 2007
    In:  Journal of Medical Genetics Vol. 44, No. 4 ( 2007-04-01), p. 241-249
    Details
    In: Journal of Medical Genetics, BMJ, Vol. 44, No. 4 ( 2007-04-01), p. 241-249
    Type of Medium: Online Resource
    ISSN: 1468-6244
    URL: Article
    DOI: 10.1136/jmg.2006.044719
    Language: English
    Publisher: BMJ
    Publication Date: 2007
    detail.hit.zdb_id: 2009590-9
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