F. Trotta, N.Pinardi, E. Fenu, A. Grandi

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Presentation transcript:

Multi-nest high-resolution model of submesoscale circulation features in the Gulf of Taranto F. Trotta, N.Pinardi, E. Fenu, A. Grandi EGU General Assembly 27/04/2017 - Session CL5.08/AS1.3/OS4.10 Downscaling: methods and applications

ONE–WAY–NESTED MODELLING APPROACH NESTED-GRID OCEAN CIRCULATION MODELLING SYSTEM Parent Domain Dl, Dj, Dz NEST1 Dl, Dj, Dz NEST2 Lateral BC Dl, Dj, Dz SURF provides a numerical plataform for short-time forecast at high spatial and temporal resolution. NEST3 ONE–WAY–NESTED MODELLING APPROACH Lateral BC Dl, Dj, Dz It is based on NEMO code: 3D Finite Difference Hydrodynamic (FDH) model which solve the primitive equations on an Arakawa C-grid with free surface. Lateral BC It can be easily and quickly deployed in any region of a large-scale Ocean Forecasting System via nesting procedure(one-way nesting approach) The plataform include multiple nesting capability. For each nesting, the coarse-grid (parent) model provides initial and lateral boundary condition to the fine-grid (child) model. We can increase the model resolution in a sub-domain and resolve a wider range of scale, not only the mesoscale flow field (10-100km) but also the submesoscale flow field (100m-10km)

CASE STUDY: THE GULF OF TARANTO LS1 LS2 CS t 01Oct 02Oct 03Oct 04Oct 05Oct 06Oct 07Oct 08Oct 09Oct 10Oct 11Oct 12Oct Oceanographic cruise (MREA14) in Taranto Gulf was carried out in October 2014 on Galatea (Italian Navy Hydrographic Institute) GULF OF TARANTO Mar Grande Costal Scale A multi-scale CTD data collection (from 1 to 11 October 2014) Large Scale: LS1 &LS2 with resolution 16km Coastal Scale: CS with resolution 5km Mar Grande : MG with resolution of 1km Large Scale

MODEL SET-UP LS1 LS2 CS t MFS NEST1 NEST2 NEST3 01Oct 02Oct 03Oct Spin-up NEST2 Spin-up NEST3 Spin-up MFS NEST1 NEST2 NEST3 TIME Start Date - 2014/10/05 (00:00) 2014/10/06 2014/10/07 nDay 8 7 6 Time Step 200s 150s 72s 36s SPATIAL GRID Horizzontal Grid (spherical coordinate system) N° of points Grid resolution 821x253 1/16 6114m 94x79 1/48 2038m 230x160 1/144 680m 220X200 1/432 227m Vertical Grid (z-coord with partial step) N° of levels Grid res 1° layer Maximu Depth 72 2.8m 2000m 120 PHYSICS Horizontal Subgrid-scale physics (bilaplacian operator) Viscosity coeff Diffusivity coeff -1e+09 -6e+08 -1.2e+07 -7.4e+06 -152416 -91449 -1881 -1129 Vert Subgrid-scale physics (PP mixing parametrization) EVD Max coeff 1.2e-05 1.2e-06 10 MFS 6km NEST1 2km NEST2 680m NEST3 227m INITIAL CONITION MFS-field (T,S,u,v and SSH) with LS1-CTD data assimilated BOUNDARY CONITION Surface BC (MFS Bulk formulae using ECMWF data ) Lateral close BC (No-slip condition) Lateral open BC (Flather and Flow Relaxation scheme) Bottom BC (Non linear friction) SPECIFIC NUMERIC FORMUL. Moment Adevection (EEN scheme) Tracer Adevection (MUSCL scheme) Bottom BC (Non linear friction)

SUBMESOSCALE STRUCUTREs MFS 6000m NEST1 2038m Horiz. section of Temp + Current at 10m (October 10 2014 24:00) MFS VS 1NEST 01 02 03 04 05 06 07 08 09 10 11 12 Large scale anticyclonic rim current with intesified jets and additional features emerged in the higher resolution nests. A submesoscale cyclonic vortex with diameter of 4 km was found. To generate this eddy a 200m resolution was required This eddy was confirmed by observational data collected in the study area. NEST1 2038m NEST2 680m 1NEST VS 2NEST NEST2 680m NEST3 227m Pinardi et all. 2016 2NEST VS 3NEST

EVOLUTION OF SUBMESOSCALE STRUCTUREs Horizontal section of Temperature + Current at 10m (October 10 2014 from 00:00 to 24:00) t 01Oct 02Oct 03Oct 04Oct 05Oct 06Oct 07Oct 08Oct 09Oct 10Oct 11Oct 12Oct Oct10–00:00 Oct10–06:00 Oct10–12:00 Oct10–18:00 Oct10–24:00 Formation of a meander. Eddy formation process accours in severa hours over a space scale of few ten km

EVOLUTION OF SUBMESOSCALE STRUCTUREs Horizontal section of Relative Vorticity at 10m (October 10 2014 from 00:00 to 24:00) t 01Oct 02Oct 03Oct 04Oct 05Oct 06Oct 07Oct 08Oct 09Oct 10Oct 11Oct 12Oct Oct10–00:00 Oct10–06:00 Oct10–12:00 Oct10–18:00 Oct10–24:00 Formation of a meander. Eddy formation process accours in severa hours over a space scale of few ten km

SURFACE MIXED-LAYER Zonal section of Vertical Velocity Field (October 10 2014 from 00:00 to 24:00) t 01Oct 02Oct 03Oct 04Oct 05Oct 06Oct 07Oct 08Oct 09Oct 10Oct 11Oct 12Oct Oct10–00:00 Increasing resolution was accompanied by an increase of vertical velocity (from few m/day (NEST1) up to 100 m/day (NEST3) near the surface.

SURFACE MIXED-LAYER Zonal section of Vertical Velocity Field (October 10 2014 from 00:00 to 24:00) t 01Oct 02Oct 03Oct 04Oct 05Oct 06Oct 07Oct 08Oct 09Oct 10Oct 11Oct 12Oct Oct10–06:00 Increasing resolution was accompanied by an increase of vertical velocity (from few m/day (NEST1) up to 100 m/day (NEST3) near the surface.

SURFACE MIXED-LAYER Zonal section of Vertical Velocity Field (October 10 2014 from 00:00 to 24:00) t 01Oct 02Oct 03Oct 04Oct 05Oct 06Oct 07Oct 08Oct 09Oct 10Oct 11Oct 12Oct Oct10–12:00 Increasing resolution was accompanied by an increase of vertical velocity (from few m/day (NEST1) up to 100 m/day (NEST3) near the surface.

SURFACE MIXED-LAYER Zonal section of Vertical Velocity Field (October 10 2014 from 00:00 to 24:00) t 01Oct 02Oct 03Oct 04Oct 05Oct 06Oct 07Oct 08Oct 09Oct 10Oct 11Oct 12Oct Oct10–18:00 Increasing resolution was accompanied by an increase of vertical velocity (from few m/day (NEST1) up to 100 m/day (NEST3) near the surface. Starting with a weakly stratified ML, we observed, in higher resolution nests, a faster restratification (increase in the restratification rate)

CONCLUSIONs We implemented a triple-nested model using the new relocatable ocean platform “SURF” from the coarser resolution (6000m) MFS model to the NEST1 (2000m), NEST2 (700m) and NEST3 (200m) models in order to explicitly resolve the submesoscale in the Gulf of Taranto. The flow field showed large-scale anticyclonic rim current with intensified jets and additional small-scale features emerging in higher resolution nests. A submesoscale cyclonic vortex with diameter of 4 km was found in the northwest region of the central anticyclonic gyre. To generate submesoscale eddies, it was found that ∼200 m resolution was required. This eddy was confirmed by observational data collected in the study area. Increasing resolution was accompanied by an increase in the vertical velocity field in the upper ocean (up to 100 m/day). As horizontal resolution increased, we obseved an increase in the restratification rate in the Mixed Layer.

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