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  • AGU (American Geophysical Union)  (1)
  • AMS (American Meteorological Society)  (1)
  • Kluwer Academic Publishers  (1)
  • Nature Publishing Group
  • 1995-1999  (3)
Document type
Publisher
Years
Year
  • 1
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    Parameterization of Processes in Deep Convection Regimes (1998)
    Kluwer Academic Publishers
    In:  In: Ocean Modelling and Parameterization. , ed. by Chassignet, E. and Verron, J. Kluwer Academic Publishers, Dordrecht, Netherlands, pp. 191-214. ISBN 0-7923-5228-9
    Details
    Publication Date: 2020-04-20
    Type: Book chapter , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Book chapter
  • 2
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    Inferring density from temperature via a density-ratio relation (1996)
    AMS (American Meteorological Society)
    In:  Journal of Atmospheric and Oceanic Technology, 13 . pp. 1202-1208.
    Details
    Publication Date: 2020-08-04
    Description: A method is presented for determining salinity and density from temperature data in conjunction with historical or contemporaneous (but not collocated) CTD observations. The horizontal density ratio r(z) is determined from the temperature and salinity differences at each depth (δT, δS) between pairs or ensembles of profiles. These differences are expressed as a density ratio r=αδT/βδS, where α and β are the expansion coefficients for temperature and salinity, respectively. Salinity at a site where only temperature is measured, as with an expendable bathythermograph (XBT), is computed based on the temperature and salinity at a reference station (SR,TR); that is, S=SR+(T−TR)δS/δT. The method is restrictive in its application because it is most accurate when all water masses in the region of a survey are linear extrapolations from the water masses at each of the reference stations. In reality, it provides useful results when the T and S fields are not simply linear functions of horizontal distance. This approach is particularly useful in regions where, the T(z)−S(z) relation is nonunique, as in the Mediterranean Water in the North Atlantic. The corresponding expression for the lateral density difference for an observed temperature difference (δT) is δρ=−αρ0δT(1−r−1). Observations from regions offshore and along the coast of Portugal are used to evaluate the method. Errors of less than 0.05 psu are exhibited in the evaluation of salinity determined from T-5 XBT drops compared with nearly simultaneous CTD casts. A comparison of water properties and cyclostrophic velocities is made using XCP temperatures and XCP velocities in a meddy.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1175/1520-0426(1996)013〈1202:IDFTVA〉2.0.CO;2
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    On the influence of submarine ridges on translation and stability of Agulhas rings (1999)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Oceans, 104 (C4). pp. 7897-7906.
    Details
    Publication Date: 2019-09-23
    Description: A series of experiments with a quasi‐geostrophic model have been carried out to investigate the influence of topographic obstacles on the translatory movement of Agulhas rings. The rings were initialized as Gaussian‐shaped anomalies in the stream function field of a two‐layer ocean at rest. Bottom topography consisted of a meridional ridge of constant height in the middle of the quadratic model domain. The vertical ring structure, the initial ring position, and the height of the ridge were varied. The general northwestward movement of the model eddies has been shown to be modified toward a more equatorward direction by encountering the upslope of the ridge. Sufficient topographic heights and strong slopes can even block the eddies and force them toward a pure meridional movement. During their translation the eddies lose their vertical coherence. After about 150 days the eddy can only be detected by the surface signal, while the lower layer eddy is dispersed by the radiation of Rossby waves. The passage of “young” (regarding the time between their initialization and their contact with the ridge) and energetic eddies is accompanied by the observation of along‐slope currents of significant strength. These may be due to the rectification of radiated Rossby waves at the topographic slope. Only eddies with a significant dynamic signal in the lower layer are influenced by the bottom topography. Strong, shallow eddies over deep lower layers can cross the ridge without strong modification of their translatory movement.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/1998JC900127
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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