Mediterranean Sea Basin Scale model

P.Lazzari, S. Salon, A. Teruzzi, K.Beranger, A. Crise

Sesame WP3 meeting Villefranche sur Mer, 25-26 Februay 2008

OGS, Trieste

1) Perform a hindcast climatological simulation (1970-2000)

2) Perform analyses of scenarios with A1B IPCC scenarios (2070-2100)

Forcing fields (circulation) from INGV simulations:

• Coupling of a biogeochemical-hydrodynamical model of the system describing the cycles of azote, phosphorus, and carbon in the general circulation of the Mediterranean Sea;

• Analyses of datasets coming from in situ and remote measurements and preparation of initial and boundary conditions;

• Sensitivity analyses of the impacts in changing forcing on the trophic web;

• Sinthetic Analyses of the results of numerical simulations and estimation of carbon fluxes in pelagic systems;

Features of the transport model

OPATM-BFMOff-line physical-biochemical coupling

• Transport model works using previously stored forcing data: temperature, salinity, 3D velocity, vertical eddy diffusion coefficients

• In principle differents programs can be adopted to originate the forcing fields after an interpolation on the transport model grid

Fully prognostic, data-free simulationNutrients nudging in the Atlantic boxNo external inputs

Diatoms

Flagellates

Picophytoplankton

L PhotoadaptationL

P(1)

Large Phyto.LP(4)

LP(2)

LP(3)

Oxygen

Carbon dioxide

O Dissolved Gases

O(2)

O(3)

Phosphate

Nitrate

Ammonium

Silicate

N Inorganic NutrientsN(1)

N(3)

N(5)

Red. EquivalentsN(6)

N(4)

ZMicrozooplankton

(s.s.)

Heterotrophic

nanoflagellates

MicrozooplanktonZ

i(5)

Zi(6)

Carnivorous

Omnivorous

Z Mesozooplankton

Zi(3)

Zi(4)

B

Bacteria (aerobic

and anaerobic)

Bacterioplankton

Bi

Dissolved

Particulate (detritus)

R Organic Matter

Ri(1)

Ri(6)

Diatoms

Flagellates

Picophytoplankton

P PhytoplanktonP

i(1)

Large Phyto.Pi(4)

Pi(2)

Pi(3)

Vectors (Functional Group or Ordinary State Variables)

Organic matter flow (C,N,P,Si)

Inorganic nutrient flow (N,P,Si)

Gas exchange

PelagicBenthic flow

Scalars (Ordinary State Variables)

Z

The BIOGEOCHEMICAL FLUX MODELThe BIOGEOCHEMICAL FLUX MODEL

Biogeochemical Model (M. Vichi )-http://www.bfm.cmcc.it/

Element relevant for model simulations

• Physical forcings• State variables initialization (nutrients)• Boundary conditions (Straits)

To produce the simulations

To analize the result

• Biogeochemical Data (Chl-a, Carbon, …)

TEST-0 SIMULATION FORCING AND I.C. USED IN THE DYNAMICAL

MODEL SIMULATION

MED16--ECMWF1/16° degree resolution; 43 vertical levelsHigher in Gibraltar Strait through curvilinear grid

Initial conditions for dynamical model: T,S seasonal, climatology MODB-4

Atmospheric Forcing : ECMWF Analyses (0.5o)Daily fluxes 1/03/1998-2005 = 8 yearsMonthly runoff UNESCO

State variables initialization

3D Field are needed T=0 “single frame” climatology is used

Model needs …

Medar Medatlas DATASET vertical profiles

Initialization of nutrients fields

phosphates, nitrates, silicates, oxygen

Boundary conditions

2D Field are needed T=0 … T=Tfin “Seasonal fileds Used”

Model needs …

Vertical profiles applied in the Atlantic Area

Atmospherical, riverine input

Nutrients,but alsoDOMcan be relevant fortotal budget

Diffusive attenuation coefficient from satellite SeaWiFS data http://seadas.gsfc.nasa.gov/PRODUCTS/SW_k490.html

With coastal area Without coastal area

1997-2004 Climatological Seasons

Data provided by Gianluca Volpe and Lia Santoleri

Model qualification

The qualification of the model is on-going.

The procedures described in the MERSEA technical report

MERSEA-WP05-MERCA-STR-0007-1A0

List of internal metrics, specifications for implementation

are applied: here are presented Class 1 consistency tests

Consistency test: comparison between patterns of chlorophyll content

obtained by satellite data and model outputs

Satellite data reprocessed by GOS-ISAC-CNR (Gianluca Volpe)

Comparison of OPATM-BFM Model Surface Chla and Satellite

Data from Oubhelkeir et al, 2005

Estimate of the Primary Production 1999-2000-2001

Deliverable 4.5.1.1First hindcasts from Mediterranean sea basin scale model available from ftp that can be used to force regional Mediterranean sea models at their

open boundaries

RUN1: First multi-annual simulation (1998-2005) - Climatological year.

Ancillary files are also provided:

- clim.ctl file to handle the monthly files (GrADS)

-BFM_var_list.m file containing all biogeochemical variables label (Matlab);

- read_mesh.m file to load meshmask data (Matlab);

- read_avedat.m file to load biogeochemical data(Matlab).

For further details and to download the data please contact: ogsmod.sesame@inogs.it