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= '''2009 Stream 3 : New features'' =  [[BR]]

Last edited [[Timestamp]]


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 [[BR]]
== S3.1  : from the community ==
[[BR]]
It is of paramount importance to incorporate features developed in the NEMO community and 
identified as priorities by the Developer’s Committee in order to improve the system and encourage 
further developments. The 7 actions are: 

•	'''S3.1-a Tidal mixing scheme''' (Bessière 2007, Koch-Larrouy 2008, Koch-Larrouy et al 2008a,b,c)[[BR]]
	Status: zdftmx.F90 added in the trunk and validated in orca2-lim (NEMO-paris), see ticket #425 . It includes both a bottom intensified vertical mixing in area of internal tide generation and a intensification throughout the water column in the Indonesian area. [[BR]]
	Pending: on-line comments and minor optimisation. See detail in ticket #457 , paper documentation #458  [[BR]]
•	'''S3.1-b Three bands light penetration + ocean colour''' (Lengaigne et al CD07, GRL08)[[BR]] 
	Status: traqsr.F90 updated in the trunk and validated in orca2-lim (NEMO-paris), see ticket #428 [[BR]]
	Pending: paper documentation, see ticket #459  [[BR]]
•	'''S3.1-c Diurnal cycle on solar radiation''' (Bernie et al. 2007)[[BR]]  
	Status: the module exists and has been validated in orca05 simulation on NEMO v2 by S. Masson and co. Its incorporation in v3 has to be done by NEMO-Paris  [[BR]]
•	'''S3.1-d Conservative Leap-Frog + Asselin filter''' (Leclair & Madec OM09)[[BR]] 
	Status: ongoing work (NEMO-Paris). See detail [wiki:2009WP/2009Stream3/LeapFrogC] [[BR]]
•	'''S3.1-e Observations operator code and increments application''' [[BR]]
	Status: to be done by NEMO-Exeter.  [[BR]]
•	'''S3.1-f Ice-shelf melting parameterisation''' (Wang & Beckmann AG07, PhD of P. Mathiot) [[BR]] 
	Status: to be done by NEMO-Paris. The key issue here is that the existing code does not include the volume flux associated with the ice-shelf melting. A major change have to be performed prior to its incorporation in the reference version.  [[BR]]
•	'''S3.1-g Parameterisation of katabatic winds''' (PhD of P. Mathiot) [[BR]]
	Status: to be done by NEMO-Paris.  [[BR]]


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== S3.2 : from NEMO team (short-term) ==
[[BR]]
It consists of the short-term developments associated with the priorities of each consortium 
members that will be incorporated into the system, as they can be useful for the user community. 
The actions of the 8 sub-stream are: 

•	'''S3.2-a New forcing''' (Tidal potential, atmospheric pressure) and river input scheme (continuation & end)[[BR]]

•	'''S3.2-b Embedding sea-ice inside the ocean''' (continuation & end)[[BR]]

•	'''S3.2-c Revisit of mass and salt fluxes between ice, ocean and air''' (continuation & end) [[BR]]

•	'''S3.2-d New advection schemes''' (PPM, Quickest and Prather) [[BR]]

•	'''S3.2-e Lateral ocean physics''' (isoneutral operator, skew flux, Visbeck coefficients, slope limitation, Aiki formulation) (continuation & end)[[BR]]

•	'''S3.2-f Ice improvements''' (momentum forcing, snow-ice formation, EVP rheology in LIM2)[[BR]]

•	'''S3.2-g Improved s-coordinate option''' (hydrostatic pressure gradient computation, POLCOM-style s-coordinate) (continuation & end)[[BR]]

•	'''S3.2-h Vertical physics''': improvements of TKE scheme, addition of a Generic length scale model[[BR]]

	--- '''zdftke2.F90 :''' validation in global condiguration, update of the paper documentation.[[BR]]
	''Status'': zdftke2.F90 has been provided by NEMO-Toulouse, with its paper documentation, and put in release v3.1 (except the doc). [[BR]]
        Problems have been found with in orca2-lim in both forced and coupled mode (NEMO-paris). [[BR]]
	''Pending issues'': [[BR]]
        (1) add the paper documentation in the trunk (DOC).[[BR]]
        (2) correct the prandl number computation in order to avoid a floating point exception. [[BR]]
        i.e. replace in tke_mlmc routine:

{{{
                  zri = MAX( rn2(ji,jj,jk), 0. ) / (zcoef * (zdku + zdkv + 1.e-20) / avmt(ji,jj,jk)) ! local Richardson number
}}}
        by

{{{
                  zri = MAX( rn2(ji,jj,jk), 0. ) * avmt(ji,jj,jk) / (zcoef * (zdku + zdkv + 1.e-20) )   ! local Richardson number
}}}

        (3) change the restart strategy to allow coupled simulation  [[BR]]
        In the current version, the restart of tke2 requires to compute en at nitend+1. In coupled mode, the forcing of the next coupled period cannot be known. The restart must be change switch from (en , dissl and avt at nitend'''+1''') to (en, dissl, avt, avm at nitend) (ongoing)

	--- '''zdfgls.F90 :''' addition of the Generic Length scale scheme (Warner et al. Ocean Modelling, 8, 81-113, 2005).[[BR]]
	''Status'': on-going work (NEMO-Toulouse). [[BR]]



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== S3.3 : from NEMO team (long-term) ==
[[BR]]
It consists of the short-term developments associated with the priorities of each consortium 
members that will be incorporated into the system, as they can be useful for the user community. 
The actions of the 8 sub-stream are: 

•	'''S3.3-a  Revisit of the time stepping in TOP''' (2 years, start in 2009)[[BR]]

•	'''S3.3-b Restore the variable volume option (key_vvl)''' (2 years, started in 2008)[[BR]]
	Status: ongoing work (NEMO-Paris). See detail [wiki:2009WP/2009Stream3/VVL] [[BR]]

•	'''S3.3-c Toward a generalisation of the split-explicit free surface''' (2 years, start in 2009)[[BR]]

•	'''S3.3-d Inclusion of the effect of waves in the marginal ice zone''' (2 years, start in 2009)[[BR]]

•	'''S3.3-e Interface to the OASIS 4 coupler''' (2-3 years, ongoing, started in 2008)[[BR]]

•	'''S3.3-f AGRIF and sea-ice''' (from 0 order to LIM2 and 3 fully AGRIFed) (3 years, started in 2008)[[BR]]

•	'''S3.3-g Development of TAM''' (ANR VODA), with a major contribution from  the LJK team (3 years, started in 2008)[[BR]]

•	'''S3.3-h High parallelisation on new plateforms''' (GPU graphic cards, OpenMP etc …, start in 2009)[[BR]]

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