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  • 1
    Article
    Article
    Eddy length scales in the North Atlantic Ocean (2007)
    Associated volumes
    Details Availability
    In: Journal of geophysical research / C, Washington, DC : Union, 1978, 112(2007), 6, Seite 06004, 2169-9275
    In: volume:112
    In: year:2007
    In: number:6
    In: pages:06004
    Type of Medium: Article
    ISSN: 2169-9275
    DOI: 10.1029/2006JC003901
    Language: English
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  • 2
    Online Resource
    Online Resource
    Stacked jets in the deep equatorial Atlantic Ocean (2008)
    Associated volumes
    Details Availability
    In: Journal of geophysical research. C, Oceans, Hoboken, NJ : Wiley, 1978, 113(2008), 2169-9291
    In: volume:113
    In: year:2008
    In: extent:12
    Type of Medium: Online Resource
    Pages: 12
    ISSN: 2169-9291
    DOI: 10.1029/2007JC004298
    Language: English
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  • 3
    Online Resource
    Online Resource
    Generation of tropical instability waves in the Atlantic Ocean (2008)
    Associated volumes
    Details Availability
    In: Journal of geophysical research. C, Oceans, Hoboken, NJ : Wiley, 1978, 113(2008), 2169-9291
    In: volume:113
    In: year:2008
    In: extent:12
    Description / Table of Contents: The spatial and temporal distributions of tropical instability waves (TIWs) in the Atlantic Ocean are investigated using a combination of current observations with moored instruments deployed at the equator at 23°W and a realistic eddy-resolving (1/12ʿ) general circulation model of the Atlantic Ocean. The meridional and vertical shears of the zonal current system contribute to the eddy production rates and thus to the generation of TIWs in the central tropical Atlantic Ocean. In the Southern Hemisphere, TIWs are forced only by baroclinic instability associated with the vertical shear of the central part of the South Equatorial Current (SEC). In the Northern Hemisphere, baroclinic instability due to the vertical shear of the northern SEC (nSEC) as well as barotropic instabilities due to horizontal shears of the Equatorial Undercurrent (EUC)/nSEC and nSEC/North Equatorial Countercurrent (NECC) contribute to the generation of the TIWs. Since seasonal changes of the instability production rates related to the EUC/nSEC are comparable low while the rates related to the nSEC/NECC are high, we suggest that the seasonality of the NECC dominates the seasonal modulation of the TIWs.
    Type of Medium: Online Resource
    Pages: 12 , graph. Darst
    ISSN: 2169-9291
    DOI: 10.1029/2007JC004712
    Language: English
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  • 4
    Online Resource
    Online Resource
    A generalised Osborn-Cox relation (2009)
    Associated volumes
    Details Availability
    In: Journal of fluid mechanics, Cambridge [u.a.] : Cambridge Univ. Press, 1956, 632(2009), Seite 457-474, 1469-7645
    In: volume:632
    In: year:2009
    In: pages:457-474
    Description / Table of Contents: The generalized temporal residual mean (TRM-G) framework is reviewed and illustrated using a numerical simulation of vertical shear instability. It is shown how TRM-G reveals the physically relevant amount of diapycnal eddy fluxes and implied diapycnal mixing, and how TRM-G relates to the OsbornCox relation, which is often used to obtain observational estimates of the diapycnal diffusivity. An exact expression for the diapycnal diffusivity in the TRM-G is given in the presence of molecular diffusion, based on acknowledging and summing up an entire hierarchy of eddy buoyancy moments. In this revised form of the OsbornCox relation, diapycnal diffusivity is related only to irreversible mixing of buoyancy, since all advective and molecular flux terms are converted to dissipation of variance and higher order moments. An approximate but closed analytical expression can be given for the revised OsbornCox relation with the caveat that this closed expression implies unphysical cross-boundary rotational fluxes. It is demonstrated that the original OsbornCox relation, in which advective and molecular flux terms are simply neglected, is an approximation to the full form valid to first order. In the numerical simulation the original OsbornCox relation holds to a surprisingly good approximation despite large advective fluxes of variance and large lateral inhomogeneity in the turbulent mixing.
    Type of Medium: Online Resource
    Pages: graph. Darst
    ISSN: 1469-7645
    DOI: 10.1017/S0022112009007484
    Language: English
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  • 5
    Online Resource
    Online Resource
    The effect of topography on the seasonal cycle of circulation and propagation of planetary waves : a simplified model study (2005)
    Kiel
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (74 Seiten = 3,4 MB) , Illustrationen, Graphen
    URL: https://oceanrep.geomar.de/2633/
    Language: English
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  • 6
    Online Resource
    Online Resource
    Effects of mesoscale eddy/wind interactions on biological new production and eddy kinetic energy (2009)
    Associated volumes
    Details Availability
    In: Journal of geophysical research. C, Oceans, Hoboken, NJ : Wiley, 1978, 114(2009), 2169-9291
    In: volume:114
    In: year:2009
    In: extent:13
    Description / Table of Contents: Accounting for ocean currents in the bulk parameterization of the wind stress might represent a physically more plausible way to force an ocean model than ignoring their effect. We show in this study that using the air-sea velocity difference instead of the atmospheric wind in the wind stress formulation dampens both the near-surface eddy activity and the biotic carbon assimilation in a high-resolution model of the North Atlantic. The former is significant, corresponding to a reduction down to 50% in the tropical Atlantic, while in higher latitudes (in agreement with previous results) the reduction of eddy activity is only around 10%. The effect on biotically mediated new production and air-sea carbon fluxes is, on the other hand, minor. New production is reduced by less than 5% on a basin average, while simulated air-sea CO2 fluxes are barely affected at all. The model results imply that eddy/wind interaction introduced by accounting for ocean currents in the wind stress formulation does not drive any additional (and hitherto unaccounted) nutrient fluxes to the sunlit surface of the subtropical gyre, as was recently proposed in the literature.
    Type of Medium: Online Resource
    Pages: 13 , graph. Darst
    ISSN: 2169-9291
    URL: http://europa.agu.org/?view=article&uri=/journals/jc/jc0905/2008JC005129/2008JC005129.xml&t=2008JC005129
    DOI: 10.1029/2008JC005129
    Language: English
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  • 7
    Article
    Article
    Wirbel in der Tiefsee : wie neue Messungen der Meeresströmungen vor der Küste Brasiliens zeigen, wandern in mehr als tausend Meter riesige Wirbel nach Süden und führen Wassermassen polaren Ursprungs mit sich (2005)
    Associated volumes
    Details Availability
    In: Spektrum der Wissenschaft, Heidelberg : Spektrum-der-Wiss.-Verl.-Ges., 1978, (2005), 6, Seite 16-20, 0170-2971
    In: year:2005
    In: number:6
    In: pages:16-20
    In: extent:3
    Type of Medium: Article
    Pages: 3 , Zahlr. Ill.
    ISSN: 0170-2971
    Language: German
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  • 8
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    Modelling the Upwelling off Mauritania (2007)
    Details
    Publication Date: 2023-01-31
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 9
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    Effects of biologically induced differential heating in an eddy-permitting coupled ocean-ecosystem model (2009)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Oceans, 114 (C6).
    Details
    Publication Date: 2018-01-15
    Description: On the basis of integrations of an eddy-permitting coupled physical-biological model of the tropical Pacific we explore changes in the simulated mean circulation as well as its intraseasonal to interannual variability driven by the biologically modulated vertical absorption profiles of solar radiation. Three sensitivity ocean hind-cast experiments, covering the period from 1948 to 2003, are performed. In the first one, simulated chlorophyll affects the attenuation of light in the water column, while in the second experiment, the chlorophyll concentration is kept constant in time by prescribing an empirically derived spatial pattern. The third experiment uses a spatially and temporally constant value for the attenuation depth. The biotically induced differential heating is generated by increased absorption of light in the surface layers, leading to a surface warming and subsurface cooling. The effect is largest in the eastern equatorial Pacific. However, the initial vertical redistribution of heat leads to considerable changes of the near-surface ocean circulation subsequently influencing the near-surface temperature structure. In general, including biophysical coupling improves the model performance in terms of temperature and ocean circulation patterns. In particular, the upwelling in the eastern equatorial Pacific is enhanced, the mixed layer becomes shallower, the warm bias in the eastern Pacific is reduced, and the zonal temperature gradient increases. This leads to stronger La Niña events and an associated increase in the variability of the Niño3 SSTA time series. Furthermore, the eddy kinetic energy (EKE) associated with mesoscale eddies in the eastern equatorial Pacific increases by almost 100% because of enhanced EKE production due to enhanced horizontal and vertical shear of the mean currents.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2008JC004936
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  • 10
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    Interpreting eddy fluxes (2007)
    AMS (American Meteorological Society)
    In:  Journal of Physical Oceanography, 37 . pp. 1282-1296.
    Details
    Publication Date: 2020-08-04
    Description: A generalization of the transformed Eulerian and temporal residual means is presented. The new formulation uses rotational fluxes of buoyancy, and the full hierarchy of statistical density moments, to reduce the cross-isopycnal eddy flux to the physically relevant component associated with the averaged water mass properties. The resulting eddy-induced diapycnal diffusivity vanishes for adiabatic, statistically steady flow, and is related to either the growth or decay of mesoscale density variance and/or the covariance between small-scale forcing (mixing) and density fluctuations, such as that associated with the irreversible removal of density variance by dissipation. The relationship between the new formulation and previous approaches is described and is illustrated using results from an eddying channel model. The formalism is quite general and applies to all kinds of averaging and to any tracer (not just density).
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1175/JPO3050.1
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