Presentation of the tools developed (part 1)

How do numerical models work?

-> Alejandro ORFILA, UIB-IMEDEA

Presentation of the tools developed (part 1)

What is ocean modelling?

The ocean (like the atmosphere) is composed by a (newtonian) fluid that can be -quite well- studied using one some basic laws and a couple of principles….

- F=m·a- Conservation of mass, temperature (energy)

Seems feasible

….

Seems feasible

….

And forcing, and assimilation….?

BUT N-S equations are hyperbolic-type…..so we need, to set up initial conditions

(1) Tosca Project is indebted at this point to: Copernico, Archimedes, da Vinci, Torricelli, Pascal, Bernoulli, Newton, Lagrange, Euler, Navier, Stokes and some (not many) others.

21/04/23

Sy

stem

(O

cean

/Atm

osph

ere/

..Dynamical Model

tFxGdt

xd

Pred

ictio

n

Assimilation

Basic Principles(1)Time

Integration

Exactly!!! ... Our problem deals with the lack of

And….N/S equations are nonlinear

How models work?

6

Oil spill/SAR Model

Model

Ocean Observing System

Assimilation

Sampling

SYSTEM

Local Authorities

End Users

Let me borrow (stole) this (slightly modified) slide from A. Molcard...O

cean

mod

ellin

g

+ SSH, SST, etc… The TOSCA concept

1.Real Time

Observing Systems

(remote and in situ)

2. Asimilation

5. End users.

3. Numerical modelling

DATOS Y OBSERVACIONES MODELOS

4. Predictions

Orfila et al, 2004

The TOSCA concept I...From modelling to observation

The Tosca Team loves Lagrangian description of thingsImagine that you track something that is moving….

The TOSCA concept II... From Euler to Lagrange

EULER

LAGRANGE

Trajectories/paths

Fields

Oil spill/SAR Model

Ocean circulation Component

Atmospheric Component

Wave ComponentLocal

System

TOSCASystem

Atmospheric Forcing and Boundary Conditions

TOSCA Modeling domains

TOSCA Modeling system

The TOSCA concept III: in 2013

Atmospheric modelHIRLAM (INM)

Res.: 0.16º

Wave model

WAM

Ocean ModelROMS-BalopRes.: 1/50º

Diffusion

Spill modelTOSCA C-drift

The TOSCA concept IV: Example of implementation at WM

The TOSCA concept V. C-drift

An open tool (in the An open tool (in the wide sense), web wide sense), web based,multi-platform based,multi-platform that provides the that provides the location of a spill in location of a spill in terms of areas of terms of areas of probability. probability.

24h 48h

Thanks for attendingTOSCA Final Meeting!