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  • 1
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    Measuring currents, ice drift, and waves from space: the Sea surface KInematics Multiscale monitoring (SKIM) concept (2018)
    Copernicus Publications (EGU)
    In:  Ocean Science, 14 (3). pp. 337-354.
    Details
    Publication Date: 2021-02-08
    Description: We propose a satellite mission that uses a near-nadir Ka-band Doppler radar to measure surface currents, ice drift and ocean waves at spatial scales of 40 km and more, with snapshots at least every day for latitudes 75 to 82°, and every few days for other latitudes. The use of incidence angles of 6 and 12° allows for measurement of the directional wave spectrum, which yields accurate corrections of the wave-induced bias in the current measurements. The instrument's design, an algorithm for current vector retrieval and the expected mission performance are presented here. The instrument proposed can reveal features of tropical ocean and marginal ice zone (MIZ) dynamics that are inaccessible to other measurement systems, and providing global monitoring of the ocean mesoscale that surpasses the capability of today's nadir altimeters. Measuring ocean wave properties has many applications, including examining wave–current interactions, air–sea fluxes, the transport and convergence of marine plastic debris and assessment of marine and coastal hazards.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.5194/os-14-337-2018
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Diagnostics of diapycnal diffusion in z-level ocean models. Part II: 3-Dimensional OGCM (2012)
    Elsevier
    In:  Ocean Modelling, 45-46 . pp. 27-36.
    Details
    Publication Date: 2019-09-23
    Description: We present a robust method for diagnosing total diapycnal diffusivities, i.e. explicitly applied plus numerically induced diffusivities, from tracer release experiments in numerical z-level models. To this extent, numerical experiments differing only in the advection scheme used (CTRD using 2nd order centred differences, UPWIND using the upwind/upstream advection scheme, QUICK using the quicker advection scheme after Farrow and Stevens (1995) and FCT after Gerdes et al. (1991)) are analysed and compared. To obtain regionally resolved estimates of diapycnal diffusivities, individual inert dye tracers are released in dynamically different regions of a North Atlantic model, namely (i) in the interior of the subtropical gyre and (ii) in the western boundary current. Diagnosed diffusivities are robust with respect to changes in temporal and spatial sampling of the simulated dye tracer for both advection schemes and for both regions. The numerically induced diffusivity is generally positive, but can become negative for centred differences advection numerics after several months of simulated tracer dispersion.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.ocemod.2011.11.006
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Diagnostics of diapycnal diffusivity in z-level ocean models part I: 1-Dimensional case studies (2010)
    Elsevier
    In:  Ocean Modelling, 35 (3). pp. 173-186.
    Details
    Publication Date: 2019-09-23
    Description: Diapycnal diffusion is a key process in the ocean, responsible for water mass transformation and the conversion of kinetic energy into potential energy. Despite its widely assumed importance in controlling ocean dynamics, diapycnal diffusion is difficult to quantify both in the real ocean and in ocean models. Here we focus on z-level models, arguably the most common vertical grid scheme of current ocean general circulation models. We examine different methods to diagnose diapycnal diffusivities in z-level models. Different scenarios are investigated, including the impact of advection and vertical convergence or divergence of isopycnals. In all cases we find that the transformation from z-space to density space has to be performed very carefully in order to obtain reliable and robust estimates of diapycnal diffusivities (and the associated diapycnal fluxes). A method involving the tracer flux taken from the work of Griffies et al. (2000) seems to be most appropriate in this respect and is suggested as our method of choice for subsequent applications to 3-dimensional ocean circulation models
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.ocemod.2010.07.004
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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