Version 45 (modified by ctlod, 11 years ago) (diff)

Last edited Timestamp?

ORCA2_LIM reference runs

A - Purposes:

Document the changes from ORCA2-LIM based on OPA8.2 and ORCA2-LIM base on last NEMO version
Key changes to be documented:

# Existing one :

  • partial step representation of bottom topography
  • updated TKE physics (surface/internal wave breaking)
  • new sea-ice component (LIM-3)
  • test (again) free-slip option

# Existing but not included in NEMO trunk :

  • Kz tides including ITF specific formulation (Laurent & Ariane PhD)
  • mesoscale eddy parametrisation : added in momentum equations (Aiki) (Claude/Gurvan? Japan)
  • 3 band light penetration (RGB) (Sebastian Japan)
  • Ocean color used to specified time-space varying light penetration (Sebastian Japan)
  • Diurnal cycle on qsr (from daily mean value) (Sebastian Japan)
  • New TKE physics #2 (MERCATOR)
  • New advection scheme on the vertical COMPACT (Laurent)
  • Time splitting over the vertical for the advection (Gurvan)
  • Freshwater input under Ice Shelves (JMM DRAKKAR)

# Forth coming one :

  • Fox-Kemper vertical velocities around the MLD parameterization (Gurvan & Xavier)
  • Advective BBL
  • bound Aeiv as a function of mean velocity
  • add Aeiv = advection-diffusion equation Eden et Greatbatch 2008-2009
  • add 3D source for ice-shelf melting, runoff and cross-land adv
  • Code and test Gent coef. vertical dependence to N2
  • Background Kz as a function of latitutde
  • mesoscale eddy parametrisation : Griffies scheme + Visbeck coefficient (Met Office?, NOCS)
  • sensitivity of the ediss parameter (MERCATOR)
  • npc reactivation (Claude/Gurvan?)
  • conservative leap-frog (Matthieu)
  • vvl + conservative leap-frog (Matthieu)

B - Ongoing simulations:

# ORCA2 + LIM 2.0 (Tag nemo_v3_2)?

# ORCA2 + LIM 2.0?

# ORCA2 + LIM 3.0?

C - To do list/ Remaining Questions:

  • check climatological CORE bulk forcing fields computed during 1st and 2nd year
  • do moficiation to perfom annual mean outputs except the last year: OK
  • check with Martin that all ice parameters for LIM 3.0 are the best one for ORCA2_LIM.
  • ensure the upload of the STRAIT.dat file (transport through straits) : OK
  • rebuild the meshmask since the scale factors have been changed on some straits: OK

Questions to solve when setting the control simulation:

  • Damping term in the Red sea is not clear, strong differences with Levitus in this area, since it is reduced in dtatem.F90 2 check
  • What are we doing with runoffs ? A: We used the standard climatology
  • freswater budget, annual correction ? A: yes, in using the previous year ssh drift.
  • Do we take into account the ice melting of Greenland and Antarctic into runoffs directly ?
  • advection scheme to use ? A: the TVD for tracers
  • define the way to manage the wind speed .vs. the sea-ice/ocean velocity, i.e do the difference of fields
  • define the relaxation time scale for the SSS restoring term and define the area i.e. (global even under sea-ice ?) Done everywhere even under sea-ice, same restorint time scale (12 days) as for SST which require a value of deds= - 864 mm/day
  • use the corrected interpolated temp/ salinity fields in Arctic from PHC for initialization suggested by Sylvain Bouillon see ticket: #227; Conkright et al. (2002) everywhere except in Arctic and Steel et al. (2001) for Arctic region data for the initialization ? (See Core paper)
  • bathymetry review ( special treatment of straits Gibraltar, Bab El ) A: yes around Gibraltar and Bab El Mandeb straits with new depth, and a reduing of scale factors.

D - Few characteristics of runs as a reminder:

  • perform internal damping (key_tradmp) ndmp = -1 around Gibraltat & Bab El Mandeb straits
  • SSS damping ln_sssr = true with a restoring time scale of 12 days (same as for SST) deds = -864 mm/day