HYDROSTATIC AND NON-HYDROSTATIC SIMULATIONS OF DENSE WATERS CASCADING OFF A SHELF: THE EAST GREENLAND CASE
The effect of non-hydrostatic dynamics and horizontal resolution on a cascading flow in a realistic configuration is investigated. The study area is the Southeast Greenland shelf where the cascading process is initiated by the passage of mesoscale surface cyclones, linked to dense overflow boluses at depth. Two very high-resolution 0.5-km simulations (one hydrostatic, the other non-hydrostatic) are considered and compared to a previous 2-km hydrostatic run. Simulations show that internal inertio-gravity waves are related to the passage of the mesoscale cyclones and directly excited by the splashing of the cascading waters in the deeper layers. Complex structures emerge and surface kinetic energy spectra flatten at scales L < 30 km in the 0.5-km runs. In the non-hydrostatic case, an energy enhancement is found in the 3 km < L < 9 km range for the vertical kinetic energy spectra at depth. This enhancement is missing in both hydrostatic runs. Time-averaged volume transport values for deep waters are instead insensitive to change in horizontal resolution and dynamics.
Magaldi, M. G., ISMAR - CNR, Lerici (SP), Italy, email@example.com
Haine, T. W., Johns Hopkins University, USA, Thomas.Haine@jhu.edu
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