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Notes from Jun 30, 2004
The primary goals of this meeting were to agree upon a written mission statement for the Earth System Model development team and to decide on an initial configuration for the development workhorse.
The agreed-upon mission statement can be viewed HERE
Configuration of initial development model:
- There are a variety of options for model components and grid
resolution. There are three main issues:
-
Fast code development turnaround
Need for long ocean spin-up
Applicability of development results to final climate model
The atmosphere model
The choice is between the b-grid core which currently running in a
stable fashion with tracers, and the finite volume core which has a
much more realistic solution
Choice: finite volume core, knowing that issues of stability and
utilization of tracer manager will need to be addressed.
The ocean model
The choice is between MOM4 which currently is running in a
stable fashion with tracers, and HIM which has yet to be coupled to an
atmosphere, or adapted for tracers
Choice: MOM4, until the feasability of a coupled HIM can be assessed.
Grid
The choice is between utilizing a coarse resolution initial model (CM1p5) and subsequently movign to high resolution, or taking on the computational burden of the high resolution model right away.
Choice: MOM4, until the feasability of a coupled HIM can be assessed and ocean BGC can be implemented.
Status of components:
- General - Khartoum syncronization means that all the new codes are
changing until the release in mid/late July
- Atmosphere - Finite volume model is available but crashes
unexpectedly. Does not currently use the standard tracer manager
which is preferable for implementation of atmospheric tracers
- Ocean BGC - Version in FRE is available; results scientifically
usable, though still has problems to be worked out
- Land BGC - Version will be available in FRE in a couple of weeks; results scientifically
usable, though still has tuning to be done
- Ocean-Atmosphere CO2 coupling - Coding still underway, hopefully
finished in 2-3 weeks
- Land-Atmosphere CO2 coupling - Coding finished and will be available in Khartoum
Continuing Action Items:
- Dunne still to run prognostic ocean BGC in OM3 resolution.
- Dunne still to compare results with Takahashi maps.
- Toggweiler and Dunne still to compare results with World Ocean Atlas in terms of
preformed nutrients over deep water formation regions.
Additional Action Items:
- Gnanadesikan will put together a coarse physical coupled model
with mom4 and the finite volume code
- Slater will put together documentation on his efforts to put
ocean-atmosphere CO2 exchange in the coupler and give a presentation
at the July 21 meeting
- Maleshev will put together documentation on his efforts to put
land-atmosphere CO2 exchange in the coupler and give a presentation
at the July 21 meeting
- Efforts to switch the finite volume model to the standard tracer
manager are underway
- When Khartoum is available, Dunne and Liu will assembe the
components for a first attempt at an ESM