regional activities at mo - godae.org · mercator ocean french operational oceanography center in...

B. Levier1, M. Benkiran1, M. Hamon1, J. Beuvier1

M. García Sotillo2

1 Mercator Ocean, Toulouse, France

2 Puertos del Estado, Madrid, Spain

Regional activities at MO

06/04/2017 GODAE COSS-TT, Cape Town 1

Cliquez et modifiez le titre

Presentation of Mercator Ocean

Global and regional forecasting systems

IBIRYS

MEDRYS

Summary

OUTLINE

06/04/2017 GODAE COSS-TT, Cape Town

Titre d’encart

2

Mercator Ocean

French operational oceanography center in charge of global ocean forecast

Non-profit company owned by 5 french agencies (all founding members)

Entrusted by the European Commission to implement and operate the Copernicus Marine Service (CMEMS).

The CMEMS provides regular and systematic core reference information on the state of the physical oceans and regional seas. The observations and forecasts produced by the service support all marine applications.

85 people (~35 scientists)

06/04/2017 GODAE COSS-TT, Cape Town 3

Mercator Ocean Global and Regional Systems


Global systems

- Operational (daily

FCST) ¼° PSY3 and

1/12° PSY4 (phy & bgc)

- Reanalysis ¼°

GLORYS (1993-2016)

and 1/12° (1980-

2015)(free run only for

R&D purposes)

Regional system CREG

- R&D only (1/4°, 1/12°,

1/36°)

Regional system MED

- Reanalysis

MEDRYS 1/12°

(1992-2015)

Regional system IBI

- Operational (daily

FCST) 1/36° (dev. by

MO, oper. by PdE)

- Reanalysis IBIRYS

1/12° (dev. and prod.

by MO, delivered by

PdE)(1992-2016)

4

Improving our global ocean systems


Future developments:

Evolution of the physical parameterization (bottom

friction, …)

Vertical coordinates

Tides (work on the free surface formulation, …)

Ocean/atmosphere interface (bulk formulae,

atmospheric layer, waves, …)

Impact of horizontal resolution in key areas (AGRIF

tool)

Sea Ice

Biogeochemical model

Data assimilation system

HF datasets (presentation from Mounir Benkiran)

Biogeochemical observations

Ensemble data assimilation

improve global

circulation

improve coastal areas for coastal

applications (downscaling)

improve realism of processes

and of key areas (choke points, high variability

regions)

main

objective

possibly feedback

5

Physical model: NEMO

BGC model: PISCES

DA: SAM2



Regional system IBI

6

IBI


Operational forecasting system: IBI36 (1/36°) 5-day daily forecasts for physics (and bio April 2017)

weekly hindcast with spectral nudging (large scale, not on

the shelves)

developed by Mercator Ocean, operated and distributed in

the framework of CMEMS by the IBI Consortium (Puertos

del Estado, Cesga, Marine Institute, AEMet, Meteo France)

Reanalysis: IBIRYS (1/12°) 2002-2014 for physics and bio

new release coming soon (1992-2016):

new altimeter period (20 years) and higher frequency

sampling

adaptive tuning of observations errors (Desrozier

diagnostic)

developed and produced by Mercator Ocean, distributed in

the framework of CMEMS by the IBI Consortium

CMEMS

product

full domain

7

IBI systems characteristics


IBI36 operational system (CMEMS V3) IBIRYS reanalysis (CMEMS V4)

NEMO version 3.6 3.6

Horizontal resolution 1/36° (2-3 km) 1/12° (5-6 km)

Vertical coordinates z*=f(ssh) , 50 levels, Partial bottom cells z*=f(ssh) , 75 levels, Partial bottom cells

Bathymetry Composite (GEBCO_08 + different local

databases)

Composite (GEBCO_08 + different local

databases)

Free surface Explicit, non-linear, time-splitting Explicit, non-linear, time-splitting

Vertical mixing k-epsilon k-epsilon

Tracer advection QUICKEST + ZALEZAK QUICKEST + ZALEZAK

Rivers As lateral point sources: Merge of daily

SMHI & PREVIMER & Monthly

climatology (GRDC), 35 rivers

As precipitations: monthly climatology

(Dai and Trenberth)

As lateral point sources: Merge of daily

SMHI & PREVIMER & Monthly

climatology (GRDC), 35 rivers

As precipitations: monthly climatology

(Dai and Trenberth

Atm. forcing ECMWF (3h)

+ analytic diurnal cycle from daily short

wave irradiance

ECMWF ERA INTERIM (3h)

+ analytic diurnal cycle from daily short

wave irradiance

Tides Yes (11 tidal components, astro pot) Yes (11 tidal components, astro pot)

Ocean color effects Merged SEAWIF/IFREMER kpar climato. Merged SEAWIF/IFREMER kpar climato.

IC & OBCs From daily 1/12° PSY4V3R1 From daily 1/4° GLORYS2V4

Data Assimilation Spectral nudging SAM2 (SEEK Filter) + IAU

Biogeochemical model PISCES (coupled online) PISCES (coupled online)

8

IBIRYS: assimilation datasets


Along track altimeter data (CMEMS product):

Jason1, Envisat and GFO

Temperature and Salinity in-situ profiles (CMEMS product)

Sea Surface Temperature : AVHRR_SST (1/4° x 1/4°)(NOAA)

MADT : CNES_CLS13 (Rio et al, CLS 2009)

In situ TS- profiles 2008

AVHRR _SST SLA coverage for a week JASON1, ENVISAT & GFO

MDT_CNES-CLS13

9


Assessment (1)

Various metrics are used for physics and BGC (for

temperature, salinity, sea level, currents, transports, sea ice,

biogeochemistry). These metrics follow the GODAE/MERSEA

classification (CLASS1 to CLASS4). They have been applied to

IBIRYS and GLORYS reanalyses.


GLO IBI

10

Assessment (2)


Physical processes are also investigated to highlight the

added-value of downscaling.

2009

JUL JUL JUL AUG AUG AUG JUN JUN JUN

U

T

Observations of poleward costal jets along the Aquitaine shelf, associated with increase of the bottom temperature (Batifoulier et al, 2002). The triggering mechanism is due to downwelling situation along the Spanish coast induced by westerly winds.

GLO IBI obs

11

WIND CURRENT

ADCP

Assessment (3)


Illustration/training on operational oceanography (Global Ocean

Week (2016), next GODEA summer school (2017)) CLASS4 intercomparaison (GLORYS/IBIRYS)

De-tiding demo

upwelling demo (impact on the biology)

Publication in preparation

12



MEDRYS reanalysis

13

Regional oceanic reanalyses MEDRYS


Ocean model: NEMOMED

12v75 model, ALDERA

atmospheric forcing

(12km/3h fluxes)

interannual BC for

Atlantic (T, S, SSH) and

rivers

Data assimilation system: One analysis every 5 days

+ no shock thanks to repartition of the analysis correction over the

cycle (IAU)

Assimilated observations: In-situ (Coriolis CORA4.1 database)

and satellite data (SST AVHRR-AMSR and SLA from

SALTO/DUACS)

14

Thermohaline contents in MEDRYS, GLORYS and in

the global 1/12° operational PSY4 (Med averages)


S3D[600m-bottom]

S3D[0-150m]

T3D[600m-bottom]

T3D[150-600m] S3D[150-600m]

T3D[0-150m]

Gibraltar transports in GLORYS, MEDRYS and in the

global 1/12° operational PSY4 (2007-2012 averages)

06/04/2017 16 GODAE COSS-TT, Cape Town

Gibraltar

transports

2007-2012

Simulations IN OUT NET

Water

(Sv)

IN : +0,75/+0,85

OUT : -0,70/-0,80

NET : ~+0,05

GLORYS reanalysis +1,53 -1,49 +0,038

PSY4 operational +1,02 -1,00 +0,015

MEDRYS reanalysis +0,80 -0,75 +0,049

T (°C) and net heat

(normalised in W/m²)

NET : +4/+7

GLORYS reanalysis 16,8 13,2 +9,9

PSY4 operational 16,2 13,2 +5,7

MEDRYS reanalysis 17,3 13,3 +6,7

S (psu) and

net salt

(normalised in 10-3

psu/year)

NET : +2/+3

GLORYS reanalysis 36,33 38,42 -16

PSY4 operational 36,40 38,45 -18

MEDRYS reanalysis 36,58 38,45 +2,6



Summary

17

Summary


Regional systems at Mercator

collaborations (IBI consortium, environnement Canada, hymex…)

platforms to test innovations in model or data assimilation (IBI, MEDRYS, CREG)

sensitivity studies (impact of observations, …)

improve the global solution

improve connection with users

Validation: systematic intercomparison with parent system and/or other systems

Complementary approaches for the next generation of Ocean Forecasting Systems:

increasing the resolution (globally or locally)

ensemble approach

18

regional activities at mo - godae.org · mercator ocean french operational oceanography center in...

Documents