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The primary goals of this meeting were to update everyone on code status and present results from the first attempt at a fully exchanging CO2 in the ESM

A) Action items from previous meeting:

1) Ascertain whether carbon is conserved in the model -
This appears to work, but further tests are necessary with continuing code changes.

2) Establishment of Standard Diagnostic Suite -
This has not yet been discussed. Gnanadesikan has offered to lead effort.

3) Get model working in concurrent mode to bump up to 150pes -
There is a working version of this code, but the expected spinup has yet to be confirmed.

4) Wait for LM3v to be frozen. -
delivery schedule is discussed below

5) Spin up land model with fixed CO2 atmosphere -
delivery schedule is discussed below

6) Spin up ocean model with spun-up land and fixed CO2 atmosphere -
waiting for initialization scheme and final code.

7) Develop code to allow radiation code to "feel" the atmospheric CO2 tracer -
coding plan is discussed below.

8) Start running on Altix when it frees up - will have to wait until Altix upgrade.

B) Results of second trial initial run

Here are CO2 fluxes from year two of the model:



Unfortunately, we had an albedo bug in this run, so it was terminated after 4 years. While the bug was found and fixed, we are currently waiting on starting up the next run in leiu of:

1) confirmation the the code runs without CO2. - Fei Liu has been putting the code together for this. He will do a 5-year run and send out a request for fidelity assessments.
2) a bunch of code development issues described below...

C) Status reports for:

1) land model tuning -
Land model tuning continues, focusing on the photosynthesis-stomatal conductance module parameterization. Shevliakova promises delivery of a frozen version of LM3v code, parameter settings and initial conditions for all components except soil by February 28th, and complete the frozen version with soilLM3v code, parameter settings and initial conditions by the end of March.

2) ocean model tuning -
Ocean model tuning has focused on the CORE 43 year core reanlysis and it's climatology. A final code version will be delivered once modularization of ocean code is complete.

3) modularizing land code for solo, physically-coupled and co2 coupled runs. -
Maleshev has a modularized code and has promised it's delivery to Fei Liu on Feb 28th

4) modularizing ocean code for solo, physically-coupled and co2 coupled runs. -
Slater has a preliminary code, but is still in the debugging phase.

5) Incorporating radiation feedbacks for CO2 -
It was decided at the meeting to perform

6) Integration of code versions -
Fei Liu will head this, but is currently waiting for code changes to be delivered by Shevliakova, Maleshev, Slater, and Dunne.

7) Writing up technical report -
Fei Liu has put together a draft "Developer's Guide".

D) Post-meeting discussion of documentation of CO2 exchange There are three varieties of code documentation that we will need to consider:

1) Technical description - This is a math and science filled description of the algorithms used. It is my understanding that Sergey and Rick are going to write separate technical descriptions for their components, along the lines of Isaac Held's existing technical description for flux exchange:

http://cobweb.gfdl.noaa.gov/fms-cgi-bin/viewcvs/FMS/coupler/flux_exchange.tech.ps

Our hope is that scientific papers documenting the land ecology (Shevliakova, Maleshev, Pacala) and the ocean biogeochemistry (Dunne, Gnanadesikan, Sarmiento). Separately, Maleshev and Slater have agreed to provide some version of this for the CO2 exchange components for land-atm and ocean-atm.

2) Developer's/User's guide - This describes the general code organization and flow, as well as the relevant compilation, field table, data table, namelist, and input file entries necessary for execution. Fei Liu's existing document is a potential starting point for this, but it needs to be expanded to be made much more specific, with charts and sections on all the components listed above. Existing examples of this include Balaji's FMS developer's guide:

http://www.gfdl.noaa.gov/~vb/FMSManual/

Fei Lui has offered to take the lead to continue revisions of the "Developer's/User's guide".

Another example is Griffies' MOM4 user's guide:

http://www.gfdl.noaa.gov/fms/pubrel/k/mom4/doc/mom4_manual.html

but this is very specific and includes many of the elements of what I would call the third type of "Quickstart/Implementation guide/recipe".

3) "Quickstart/Implementation guide/recipe" - This is a HOWTO document for people intending to quickly get run the code. Griffies' MOM4 user's guide includes this in addition to the general description, but I've also put together a suite of these for MOM4 on the ESMDT home page to do this:

http://www.gfdl.noaa.gov/~jpd/howto_run_tracer_xml.html
http://www.gfdl.noaa.gov/~jpd/troubleshooting.html
http://www.gfdl.noaa.gov/~jpd/preprocessing.html
http://www.gfdl.noaa.gov/~jpd/howto_add_tracer.html

Dunne's plan is to put together a similar collection of guides for running the ESM.

E) Plans for next two months/continuing action items.

1) The primary code development goal is to have a frozen rts checkout.

2) A third attempt at running the full system to test physical fidelity and CO2 conservation.

3) Finalization of ocean carbon system initialization plan.

4) Establishment of diagnostic suite.

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