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  • 1
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    Relative dispersion in the Nordic Seas (2009)
    Sears Foundation for Marine Research
    In:  Journal of Marine Research, 67 (4). pp. 411-433.
    Details
    Publication Date: 2020-07-23
    Description: We examine the relative dispersion of surface drifters deployed in the POLEWARD experiment in the Nordic Seas during 2007–2008. The drifters were launched in pairs and triplets, yielding 67 pairs with an initial separation of 2 km or less. There were 26 additional pairs from drifters which subsequently came near one another. As these produced statistically identical dispersion to the original pairs, we used them as well, yielding 93 pairs. The relative dispersion exhibits three phases. The first occurs during the first two days, at spatial scales less than 10 km. The dispersion increases approximately exponentially during this period, with an e-folding time of roughly half a day. During the second phase, from 2 to roughly 10 days and scales of 10 to roughly 100 km, the dispersion increases as a power law, with r2 α t3. At the largest spatial and temporal scales, the dispersion increases linearly in time and the pair velocities are uncorrelated, consistent with diffusive spreading. We use a stochastic model with a representative mean flow to test the effect of the mean shear on dispersion. The model produces dispersion comparable to the observed during the second and third phases but fails to capture other statistics, such as the PDFs of the displacements. These statistics are instead suggestive of an inverse energy cascade, from the deformation scale up to 100 km.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1357/002224009790741102
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Plankton cycles disguised by turbulent advection (2007)
    Academic Press
    In:  Theoretical Population Biology, 72 (1). pp. 1-6.
    Details
    Publication Date: 2020-05-05
    Description: Mathematical models used to represent plankton dynamics often display limit-cycle behavior in a range of realistic parameter values. However, experimental data do not show evidence of plankton oscillations besides externally driven seasonal blooms, casting doubts on the validity of the models themselves. In this work we show that spatial-temporal variability, coupled with advection by mesoscale turbulence, can disguise limit-cycle behavior to the point that it cannot be detected in fixed-point measurements of plankton abundance. The results presented here have more general implications as they indicate that the behavior of ecosystem models in the presence of advection can be very different from that occurring for homogeneous conditions. Care should thus be exercised in drawing general conclusions from the analysis of homogeneous ecosystem models.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.tpb.2007.03.007
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Dynamics of wind-forced coherent anticyclones in the open ocean (2009)
    AGU
    In:  Journal of Geophysical Research, 114 (C8).
    Details
    Publication Date: 2020-07-23
    Description: We numerically study the dynamics of coherent anticyclonic eddies in the ocean interior. For the hydrostatic, rotating, stably stratified turbulence we use a high-resolution primitive equation model forced by small-scale winds in an idealized configuration. Many properties of the horizontal motions are found to be similar to those of two-dimensional and quasi-geostrophic turbulence. Major differences are a strong cyclone-anticyclone asymmetry linked to the straining field exerted by vortex Rossby waves, which is also found in shallow water flows, and the complex structure of the vertical velocity field, which we analyze in detail. Locally, the motion can become strongly ageostrophic, and vertical velocities associated with vortices can reach magnitudes and levels of spatial complexity akin to those reported for frontal regions. Transport and mixing properties of the flow field are further investigated by analyzing Lagrangian trajectories. Particles released in the pycnocline undergo large vertical excursions because of the vertical velocities associated to the vortices, with potentially important consequences for marine ecosystem dynamics.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2009JC005388
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Mesoscale vortices, Lagrangian transport and marine ecosystem dynamics (2008)
    In:  (PhD/ Doctoral thesis), Politecnico di Torino, Torino, Italy, 104 pp
    Details
    Publication Date: 2015-03-10
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
  • 5
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    Baltic Sea waves analysis by using chaos theory tools, Computer Systems Engeneering: Theory and Applications (2005)
    Drukarnia Oficyny Wydawniczej Politechniki Wroclawskiej
    In:  In: Proceedings of The Fifth Polish-British Workshop, 2006. Drukarnia Oficyny Wydawniczej Politechniki Wroclawskiej, Wroclaw-Ladek Zdroj, Poland, pp. 1-16.
    Details
    Publication Date: 2015-03-10
    Description: The motivation for this paper was to assess the applicability of the novel approach derived from chaos theory to the description and analysis of dynamics of the free sea surface, in particular to the phase space reconstruction of the dynamical system from the observed time series. The free sea surface elevation data sets were sampled at the Baltic Coastal Research Station Lubiatowo in Poland. After proper processing the experimental data, it was found that the sea surface elevations can be described as a result of a four-dimensional process, which appears to be weakly chaotic, characterized by a positive largest Lyapunov exponent and a short prediction horizon. It was confirmed that using chaos theory tools may be very promising for diagnosing certain properties of the sea waves. Moreover, in the paper, some new technique for evaluation of the average mutual information is introduced.
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
  • 6
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    Produttivita primaria dell' ecosistema marino, turbolenza oceanica e cicli biogeochimici globali (2007)
    Consiglio Nazionale delle Ricerche
    In:  In: Clima e Cambiamenti Climatici le attività di ricerca del CNR. , ed. by Carli, B., Cavarretta, G., Colacino, M. and Fuzzi, S. Consiglio Nazionale delle Ricerche, Roma, Italy, pp. 59-62.
    Details
    Publication Date: 2015-03-10
    Description: Il ciclo globale del carbonio e la concentrazione atmosferica di CO2 sono influenzati dai flussi biogeochimici fra oceano ed atmosfera. Questi flussi dipendono dal funzionamento dell’ecosistema marino; modifiche significative nella dinamica del plancton e nella produttività primaria possono avere rilevanti effetti sul clima. La dinamica del plancton, a sua volta, risente degli effetti di trasporto e rimescolamento indotti dalle strutture a mesoscala quali vortici e fronti, che per questo motivo sono uno degli attori sulla scena della dinamica del clima
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
  • 7
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    Vibrating pendulum and stratified fluids (2005)
    Woods Hole Oceanographic Institution
    In:  In: 2005 Program in Geophysical Fluid Dynamics: Fast Times and Fine Scales. , ed. by Buhler, O. and Doering, C. Geophysical Fluid Dynamics Proceedings Volumes, 2005 . Woods Hole Oceanographic Institution, Woods Hole, USA, pp. 205-224.
    Details
    Publication Date: 2015-03-10
    Type: Book chapter , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Book chapter
  • 8
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    Turbulent advection and plankton cycles (2006)
    In:  [Talk] In: EGU General Assembly 2006, 02.-07.04.2006, Vienna, Austria .
    Details
    Publication Date: 2015-03-09
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
  • 9
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    Internal Wave Measurements With a Towed CTD Chain on the New Jersey Shelf (2006)
    In:  [Talk] In: AGU Fall Meeting 2006, 11.-15.12.2006, San Francisco, USA .
    Details
    Publication Date: 2015-03-09
    Description: A chain of 48 CTD units was towed through nonlinear internal wave packets on the continental shelf off New Jersey in August 2006, as part of the Shallow Water 2006 (SW06) experiment. Repeated passes through each packet were made, in order to study the evolution of the packets. The system was deployed in a way to get a resolution up to 1 m in the vertical and up to 6 m in the horizontal. A variety of phenomena were encountered, including evolution from an internal bore without waves into a packet with many waves, merging packets, solitary waves, and slower mode 2 waves. One example of a comparison with theoretical predictions is to compare the speed and detailed shape of waves to solutions of the Dubreil-Jacotin-Long equation for solitary waves.
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
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