Mercator-NEMO team - 2013 actions

Last edited Timestamp?

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members

Name	Institution	%	Position
Clément Bricaud	Mercator Océan, Toulouse	20%	Mercator NEMO officer
Guillaume Reffray	Mercator Océan, Toulouse	20%	Mercator developper
Jerome Chanut	Mercator Océan, Toulouse	20%	Mercator developper
Julien Paul	Mercator Océan, Toulouse	20%	Mercator developper
Romain Bourdalle-Badie	Mercator Océan, Toulouse	20%	Mercator developper
Mondher Chekki	Mercator Océan, Toulouse	0%	Mercator Consortium expert
Yann Drillet	Mercator Océan, Toulouse	0%	Mercator Consortium expert

total weeks :
40 wk (1 man/year)

Summary:

Action	nb weeks	Brief description	Status	Branch name	Trac ticket n°	Wiki page name	Reviewer(s)	Review status	Ready for merge. If "NO", reason and status for 2014
Mercator-1	6	resolving the 2 versions of time-stepping	will be OK for merge 2013	dev_r3867_MERCATOR1_DYN	1079				YES
Mercator-2	2	exploration of implicit bottom friction	included in Mercator-1	1079					YES
Mercator-3	2	Solar flux filtering at daily frequency to force biogeochemistry model	will be OK for merge 2013	dev_r3856_MERCATOR3_QSRMEAN24H	1076				YES
Mercator-4	3	Implementation a configuration manager	a first version will be provided for merge 2013						to be finished in 2014 ; need more time to add new functionnalities and remove some bugs
Mercator-5	3	Add a 1D reference configuration on PAPA station	will be OK for merge 2013	dev_r4022_MERCATOR5_PAPA1D	1152				YES
Mercator-6	6	End of BDY-OBC merge	Will be OK for merge 2013	dev_r3987_METO1_MERCATOR6_OBC_BDY_merge	1090				YES
Mercator-7	2	implementation of OBC's schemes for PISCES	postponned 2014						waiting for CMCC.6 Surface and lateral boundary conditions for tracers
Mercator-8	3	Data assimilation interface: model equivalent of a SLA	postponned 2014						not started ; need some time to find a solution to filter HF in ssh ( done on 21 days in AVISO )

Major points of Mercator's contribution:

'''MERCATOR.1 — resolving the 2 versions of time-stepping'''

Motivation: Tracer conservation and time splitting. reference: Shchepetkin, A. F., and J. C. McWilliams? , 2005
Status : Running in NEATL36 at Mercator.
main tasks : Main idea:replace Leapfrog scheme by a Fb tamporal scheme, but keep actual method for updating ssh at 3D time-stepping.
workplan:
1. test some eventual problem of divergence of SSh in barotropic mode compared to SSH in 3d mode ( cf Hallberg and Adcroft, OM 2009: Reconciling estimates of the free surface height in Lagrangian vertical coordinate ocean models with mode-split time stepping).
2. implementation in NEMO_3.3 of this time-splitting.
3. test in high-resolution configuration at Mercator.
4. take a decision for reorganization of step for time-splitting.
Priority: High
Principal Investigator : Clement Bricaud & Jerome Chanut (jchanut@…)
Science Reviewer : Gurvan Madec --
System Reviewer : Gurvan Madec
Number of weeks : 4 (TBC)

MERCATOR.2 — exploration of implicit bottom friction

Motivation: Use NEMO standard implicit bottom friction in Mercator Regional configuration ( z-coord ).

Status :

main tasks :
Principal Investigator : Jerome Chanut (jchanut@…)
Priority: high
Science Reviewer :
System Reviewer :
Number of weeks : 2 (TBC)

'''MERCATOR.3 — Solar flux filtering at daily frequency to force biogeochemistry model. '''

Motivation: For coupled model ( physic + bio ): physic needs 24 hours (+ diurnal cycle) or 3 hours solar fluxes, but bio need a 24 hours mean.
Status : End of 2012 task
main tasks :
Principal Investigator : Clement Bricaud (cbricaud@…)
Priority: high
Science Reviewer : Gurvan Madec --
System Reviewer : Gurvan Madec
Number of weeks : 2 (TBC)

'''MERCATOR.4 — Implementation of a configuration manager '''

Motivation: Add a configuration manager
Status :
main tasks :
a first version is implemented:
built a coordinate file from ORCA 1/4 to higher resolution: OK
built a bahtymetry from a ORCA025 bathymetriy on higher resolution and extract it on the domain: OK
Merge mother and child bahtymetry: to be debugued.
Create boundaries files: to be debugued.
Create Initial conditions from restat/model output/climatology files: OK

Principal Investigator : Julien Paul (jpaul@…)
Priority: high
Science Reviewer : --
System Reviewer :
Number of weeks : 2 (TBC)

'''MERCATOR.5 — Add a 1D reference configuration on PAPA station '''

Motivation: Vertical physics and numerics studying
Status :
main tasks :

provide a set of file including:
an initial condition ( date=06/06/2010)
bathymetry
chlorophyle data
one year of operationnal ECMWF atmospheric files ( 3h frequency for variable and 24hfrequency for fluxes ) provided at 1hour frequency

Principal Investigator : Romain Bourdalle-Badie, Guillaume Reffray (greffray@…, rbourdal@…)
Priority: high
Science Reviewer : Marcello Vichi --
System Reviewer : Marcello Vichi
Number of weeks : 2 (TBC)

'''MERCATOR.6 — End of OBC-BDY merge, with UK Metoffice '''

Motivation: .
Status :
main tasks :
Principal Investigator : Jerome Chanut (jchanut@…)& Guillaume Reffray (greffray@…)
Priority: high
Number of weeks : 2 (TBC)

'''MERCATOR.7 — implementation of OBC's schemes for PISCES '''

Motivation: Use new package ; implement new methods.
Status :
main tasks :
Principal Investigator : Guillaume Reffray (greffray@…)
Priority:
Science Reviewer : --
System Reviewer :
Number of weeks : 2 (TBC)

'''MERCATOR.8 — Data assimilation interface: model equivalent of a SLA '''

Motivation:
Status :
main tasks : make the same treatment as done in AVISO
Principal Investigator : Elisabeth Remy (eremy@…)
Priority:
Science Reviewer : --
System Reviewer :
Number of weeks : 2 (TBC)

aditionnal work:

Agrif has been tested by Jerome: running with filtred SSH, with new time-splitting, with several levels of AGRIF zooms.
==> Jerome has some improvments for Agrif + filtred SSH to put in the trunk.
XIOS tested on high resolution global configuration ( ORCA12, ORCA025)

Major points:
Generalized forward-backward time-splitting implemented
A first release of configuration manager is implemented
A 1D-PAPA station configuration is available, for vertical physic study.

list of problems:
still some problems with XIOS, with files size greater than 2Go, with outputs of scalar variable and moorings
An issue is concerning the coupling of barotropic mode between grids when AGRIF is activated.