Discussion on the impact of physical data assimilation Assessment of global hindcast and real-time biogeochemical systems designed at Mercator Ocean: PERRUCHE 1 C., Y. DRILLET 1 , E. GUTKNECHT 1 , C., J. PAUL 1 , E. GREINER 2 , M. GEHLEN 3 1 Mercator Océan, France 2 CLS, France 3 LSCE, France 12/07/2016 GODAE Joint MEAP-DA-TT, Santa Cruz
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Discussion on the impact of physical data
assimilation
Assessment of global hindcast and real-time
biogeochemical systems designed at
Mercator Ocean:
PERRUCHE1 C., Y. DRILLET1, E. GUTKNECHT1, C., J. PAUL1,
E. GREINER2, M. GEHLEN3
1 Mercator Océan, France 2 CLS, France 3 LSCE, France
12/07/2016 GODAE Joint MEAP-DA-TT, Santa Cruz
Introduction
Copernicus Marine Service
Copernicus: EU program dedicated to Earth Observation and Monitoring
- Collect satellite and in situ Data
- Turn these data into information through services divided in 6 thematic
streams: atmosphere, land, marine and climate monitoring, emergency
Modelled Chl (daily), superimposed modelled SSH with assimilation
NO ASSIM
January, 15th
ASSIM
January, 15th
Better positioning of
the front with
assimilation of
physical data
Boundary between
oligotrophic gyre and
subpolar gyre more
zonal
12/07/2016 GODAE Joint MEAP-DA-TT, Santa Cruz
Impact of assimilation
Positioning of fine-scale structures
Conclusion & Perspectives
12/07/2016 GODAE Joint MEAP-DA-TT, Santa Cruz
• Adjustement of the equatorial upwelling to physical data assimilation: Still work-in-progress, need to disentangle the effect of each parameter assimilation (T, S, SSH)
• The assimilation clearly allows a better positioning of frontal and mesoscale structures
• September 2016: In Copernicus, new operational system forced by the GLOBAL 1/12° operational analysis (coarsening offline towards ¼°)
• Next simulation NEMO3.6: Start from the 20th century simulation realized in the ERACLIM2 project (cf talk of P. Laloyaux)
• Assimilation of ocean color data for 2017 (see poster J. Lamouroux)
22/07/2016 Name of the event, Place
The end !
GLOBAL ¼°: Next systems
• September 2016: In Copernicus, new operational system
forced by the GLOBAL 1/12° operational analysis
(coarsening offline towards ¼°)
• Next simulation NEMO3.6: Start from the 20th century
simulation realized in the ERACLIM2 project: see talk of
P. Laloyaux (NEMO3.6, 1°, 130 years of spin-up)
• Assimilation of ocean color data for 2017 (see poster J.
Lamouroux)
12/07/2016 GODAE Joint MEAP-DA-TT, Santa Cruz
ANIMATION
22/07/2016 Name of the event, Place
ANIMATION
22/07/2016 Name of the event, Place
22/07/2016 Name of the event, Place
Impact of assimilation: better positionning of
fronts and mesoscale structures
Mo
de
#1
Mo
de
#2
Modèle GlobColour
Anomaly Chl 40S-40N x (-1)
SST anomaly
Good representation of the two 1st modes of variability (spatial signature and time series)
Good correlation with ENSO index (Thomas et al., 2012)
12/07/2016 GODAE Joint MEAP-DA-TT, Santa Cruz
Interannual variability
EOF decomposition of chlorophyll
Assessment HINDCAST
GLOBAL ¼°: Interannual simulation
NO ASSIM
April, 15th
ASSIM
April, 15th
Modeled Chl (daily), superimposed modeled SSH with assimilation