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CCSM Ocean Model Working Group Meeting
Thursday and Friday, 20 and 21 March 2003 (see Overview)
Rick Smith and Bill Large, Co-Chairs

AGENDA and REPORT

Thursday, 20 March 2003

8:00 – 8:30    Continental Breakfast

8:30 – 8:50     WELCOME, MEETING PURPOSE, AND FINALIZE AGENDA    (Rick Smith and Bill Large)

Overview: The scope of the meeting was severely curtailed by the Denver airport closure and the absence of most participants from outside of Boulder. Nonetheless, Steve Jayne, Frank Bryan, and Nori Nakishiki did arrive, and with the local participants some presentations and discussions did take place. Links to the presentations we did receive are given below, along with a brief synopsis. Some other agenda items have been postponed to the Breckenridge meeting in June.

The resources of the ocean working group include 1 FTE and per month allocations of 1900 GAUs production, and 6800 GAUs development. Plans are to increase the production to the point where the Ocean Working Group (OWG) could have a fully coupled experiment running nearly continuously. Which experiment would depend on OWG prioritization and an identified member willing to lead the analysis? For reference 1 year of standard CCSM2 integration takes ~60 GAUs on bluesky, and about 10 years can be done per day, implying that we could use an order of magnitude more production time. A strong case will need to be made.

8:50 – 10:10     CCSM OCEAN MODEL CHANGES FOR IPCC RELEASE (Bill Large)

The OWG constituted a Change Review Board for ocean model changes proposed for the IPCC model version. All changes passed this stage of the adoption process and will undergo the next stages of testing, taking into account suggestions from the OWG.

10:10 – 10:30     Break with Paleoclimate Model Working Group (Room 1001)

10:30 – 12:30     JOINT SESSION WITH PALEOCLIMATE WORKING GROUP (Bette Otto-Bliesner)

  • Grid Generation (Steve Yeager, 30 min) Presentation: Power Point; HTML; PDF
    • The process of generating new grids, either for the present day or paleoclimate applications, has been streamlined or documented.
  • Alternative Initial Conditions Presentation: PowerPoint; HTML; PDF
    • Cretaceous (tabled)
    • Present Day (Gokhan Danabasoglu, 15 min)
  • Discussion of Alternative Models
    • 2 Degree Resolution (Esther Brady and Steve Jayne, 20 min)

It was agreed to peruse improving the performance of the coupled x3 before committing to another model configuration. The criteria are to be meridional overturning circulation in the North Atlantic, ACC strength, and interannual variability of sea level height in the tropical Pacific.

    • Upper Ocean Model (tabled)
  • Sea-Ice Switch Mechanism for Glacial Cycles (Eli Tziperman, 25 min)  Presentation: PowerPoint; HTML; PDF
    • Can we expect a switch-like mechanism for the sea ice cover during glacial times?
    • Can sea ice control the moisture supply to land ice sheets?

12:30 – 1:30     Lunch

1:30 - 3:00       DATA ASSIMILATION

  • Data assimilation in POP (tabled)
  • USGODAE: Weak 4DVAR for real-time ENSO initialization and prediction (tabled)
  • Super-nudging experiments (Gokhan Danabasoglu, 20 min)  Presentation: PowerPoint; HTML; PDF

3:00 - 3:20     BREAK

3:20 - 5:30    HIGH RESOLUTION OCEAN MODELING

Friday, 21 March 2003
 

8:00 – 8:30    Continental Breakfast

8:30 – 8:50     COUPLED EXPERIMENTS ADDRESSING OCEAN SCIENCE QUESTIONS (Bill Large)

10:10 - 10:30   Break 

10:30 - 12:00   FUTURE MODEL DEVELOPMENTS

12:00 - 1:00     Lunch 

1:00 - 2:00       REVISIT TABLED ITEMS FROM PREVIOUS SESSIONS
                         (Rick Smith and Bill Large)

2:00 - 3:00       ROUNDTABLE DISCUSSION OF JOINT COLLABORATIONS (Tabled)