Nonlinear Processes in Oceanic and Atmospheric Flows



Author: M. Liste, IH Cantabria- Universidad de Cantabria.

Names and affiliation of other authors:
M. Olabarrieta, R. Medina, S. Castanedo
Instituto de Hidráulica Ambiental “IH Cantabria”. Universidad de Cantabria. ETS de Ingenieros de Caminos, Canales y Puertos, Avda. de los Castros s/n, 39005 Santander, España.

Oral or poster: Oral presentation

In order to study the exchange of North Atlantic Ocean and Mediterranean Sea water around the Iberian Peninsula through the Strait of Gibraltar and the associated currents, including the MOW density current, a model is required.
Therefore, an ocean model called MEDiNA, which comes from the DieCAST model (Dietrich et al.,1987), has been developed.
The MEDiNA model has six different grids. A z-level, 4th-order-accurate ocean model is applied in six two-way-coupled grids spanning the model domain. Resolutions vary from 1/4° in central North Atlantic to 1/24° in the Strait of Gibraltar region. This allows the MEDiNA model to efficiently resolve small features in a multi-basin model. The wind forcing of MEDiNA is obtained from interpolated monthly Hellerman winds. The World Ocean Atlas climatology database is used to initialize MEDiNA.
The 1/8° Mediterranean Sea grid forms deep water by resolved flow that emulates subgrid-scale processes directly, avoiding watermass drift. No excessively watermass-diluting process allows advection to realistically dominate downslope migration of dense MOW. This and the model’s higher order numerics allow simulation of the narrow, thin MOW downslope migration with little dilution.
The model results show realistic MOW migration to the observed equilibrium depth, consistent with the climatology (Dietrich et al., 2008)

Currently, the model is running and temporal series of temperature, salinity and current velocity are being obtaine

Formatted version of the abstract or additional information

*Satellite images from NASA and ESA

Nonlinear Processes in Oceanic and Atmospheric Flows. July 2-4, 2008. Castro Urdiales, Cantabria, Spain.