COUPLED MODELING Purpose: Review where the various centers are with their ocean models, how they got there, and outline the major outstanding issues. CMIP5 model and simulation documentations will be much more comprehensive and complete: - standard vocabulary to describe models and simulations, - interactive web-based questionnaire to provide information, - information in a searchable data base linked to the model outputs. Two groups are collaborating: Metafor (E. Guilyardi) and Earth System Curator (V. Balaji, C. DeLuca)
COUPLED MODELING. Purpose: Review where the various centers are with their ocean models , how they got there, and outline the major outstanding issues. CMIP5 model and simulation documentations will be much more comprehensive and complete: - PowerPoint PPT Presentation
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COUPLED MODELING
Purpose: Review where the various centers are with their ocean models, how they got there, and outline the major outstanding issues.
CMIP5 model and simulation documentations will be much more comprehensive and complete: - standard vocabulary to describe models and simulations, - interactive web-based questionnaire to provide information, - information in a searchable data base linked to the model outputs.
Two groups are collaborating: Metafor (E. Guilyardi) and Earth System Curator (V. Balaji, C. DeLuca)
CMIP5 Long-term Experiments
Coupled carbon-cycle climate models only
All simulations are forced by prescribed concentrations except those “E-driven” (i.e., emission-driven).
GM, Redi, hor. viscosity (Lap. & Bihar.), Kraus-Turner and Peters et al. vertical mixing / modified coeff. & bihar. (DP)
Yes LT and DP
MPI MPIOM 1oxL40 (LT)0.4oxL80 (DP, 20C), tripole
GM, Redi, PP vert. mixing, BBL, tidal
Spunup with 3oxL40 3000 yrs
In preparation, efficiency issues on new machine
SUMMARY• Model readiness and participation in either coupled
carbon cycle experiments or experiment sets vary considerably,
• 1850 control integrations, except Hadley Centre (1860),
• Mostly level coordinate models with nominal 1o horizontal resolutions,
• Redi and GM for tracer mixing are rather uniform, but there are significant differences in diffusivity coefficient choices, e.g., constant, spatially varying, (un)equal thickness and isopycnal, etc.,
• There appears to be some increase in the use of tidal mixing parameterization,
• Vertical mixing scheme as well as horizontal viscosity choices vary.
Center Major outstanding ocean model issues / biases
Plans for addressing these & other ocean model improvements
Tune ocean-ice coupling, explore vertical mixing schemes, explore tuning of IT through Rayleigh linear damping
CSIRO/QCCCE Aware of some model biases No further work to address these with this particular model
CCCma SST and SSS biases, high ACC transport
Switch to a different model
EC-Earth TOM is 0.4 Wm-2, but little model drift, too cool SSTs in the tropics, too warm at high latitudes particularly in the SO, not much sea ice, deep water is cold, too much LSW water and not enough Nordic Sea water
Switch to NEMOv3,Implement biogeochemistry
NERSC Large AMOC and heat transport concerns, strong positive SSS anomaly in the Arctic, some problems with the diffusivity coefficients
Abandon Leap-Frog scheme, eliminate virtual salt fluxes, handle floating ice shelves, conform to the new EOS, change grid staggering
Center Major outstanding ocean model issues / biases
Plans for addressing these & other ocean model improvements
MRI Warm Antarctic bottom water, overshooting WBCs, O2 is too high in the northern Indian Ocean
Increase horizontal resolution to eddy permitting, couple to a wave model, include iron in biogeochemistry
LASG IAP Too much ice
INGV Cold SSTs in the mid-latitude Pacific and Atlantic
MPI Biases in subsurface T & S, too much horizontal mixing in the upper layers of the Med. Outflow, OMZ problem (appears to be resolution dependent)
Working on BBL scheme details, implementation of modified sea-ice thermodynamics, mixing due to internal tides
Hadley Centre OMZ problems (negative), coupling dust and interactive vegetation challenges, too much production in the Equatorial Pacific, issues with vertical profile of tracer diffusivity
Switch to NEMO
Ocean model biases in preliminary CanCM4 20th century run (no carbon cycle)
Differences are between 1980-1999 average and Levitus/PHC climatology
SST SSS
B. Merryfield
Sea Surface Temperature from CCSM41850 control 20th Century
Center Major outstanding ocean model issues / biases
Plans for addressing these & other ocean model improvements