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Notes from Jun 23, 2004
The primary goals of this meeting was to get everyone together and update them on the recommendations of the Earth System Model Development Task Force, the current status of the various physical and biogeochemical modules and the near-term plans at GFDL.
Recommendations of the Earth System Model Development Task Force
- Essentially, to create the Earth System Model Development Team.
The full presentation can be downloaded HERE
Climate physics Status:
- IPCC version of CM2, with MOM4 ocean and bgrid atmosphere, is
undergoing final tuning, but is only minimally acceptable as a Dec-Cen
model.
- Code for CM2p1, with MOM4 ocean and Finite Volume atmosphere,
should be available in a matter of weeks, but model development to
assess (and ensure) fidelity is
only in the beginning stages.
Ocean Biogeochemistry Status:
- In general, the model is competitve with other state of the art
models. Ongoing work is being done to address the:
- strangely high
primary productivity in the equatorial upwelling region (with
correspondingly low pe-ratio)
- artificially low interior O2 leading to overly high
denitrification rates and an overall loss of NO3
- tuning of dissolved organic cycling
- movement of gas exchange calculation from the ocean to the coupler
Land Biogeochemistry Status:
- Converging land model, though soil biomass is too high leading to
a misrepresentation of the timing and magnitude of CO2 fluxes. Gas
exchange calculation has been successfully moved to the coupler.
Restarts are not yet all in netcdf, and conversion to FRE is ongoing.
Research Interests of Attendees:
This was an informal survey of attendees to gauge the degree o commonality in the overall scientific goals of GFDL and Princeton with respect to applying Earth System Models. While these interests do not necessarily drive the development plans, they provide a broad-brush indication of potential ESM applications and potential issues to keep in mind as decisions are made that do not directly affect the IPCC-style Decadal-Centennial applications, but may be synergistic with it.- Dunne - assessing ocean bgc algorithms as they indicate
mechanistic controls, fisheries applications, paleo-scenerios for
glacial-interglacial and the 3MYA transitions
- Hallberg - ocean biology as a test of the fidelity of physical representations
- Fan - analyze model results, including spatial and
temporal variations of carbon fluxes and atmospheric CO2
mixing ratios, and compare to observations.
- Sarmiento - taking the critical next step towards a high
resolution climate/earth system tool
- Arbic - BGC as fidelity assessment tool for isopycnal model physics
- Simeon - Application of Earth System Model
- Stouffer - Delivering physical climate model amenable to bgc
- Fiore - non-carbon applications of the ESM, specifically to look
at air quality, climate, ecosystem interactions in a fully coupled
way. Species of primary interest: nitrogen, methane, carbon monoxide &
biogenic volatile organic compounds (BVOC), all precursors to ozone and
some to aerosols. Potential contributions to the team: BVOC, soil NO
emissions, working w/ a new post-doc on N cycling in the land model,
evaluating model output, preferably as it relates to impacts on the
above species.
- Thompson - adapting the land model into the FMS runtime environment.
- Sweeney - Change in carbon uptake in the southern ocean due to
changes in forcing over the last 40 years and projected
changes in: wind, biology, atmospheric CO2 and
stratification. Also global surface pCO2 fields. Can we
capture natural and anthropogenic changes in uptake of CO2
with surface measurements?
- Toggweiler - Paleo-climate; Land-ocean interface as regards the chemistry
of river water coming into the ocean such as alkalinity and CO2 and
how they should be balanced with sedimentation.
Action Items:
- Dunne to run prognostic ocean BGC in OM3 resolution.
- Dunne to compare results with Takahashi maps.
- Toggweiler and Dunne to compare results with World Ocean Atlas in terms of
preformed nutrients over deep water formation regions.