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Minutes of the CSM SSC Meeting

27 January 1998

NCAR, Boulder, Colorado

Attendees: Maurice Blackmon (Chair), David Randall, Robert Dickinson, Susan Solomon, J. Shukla, Jay Fein, Byron Boville, Peter Gent, Jeffrey Kiehl, Frank Bryan, and Lydia Harper

  1. New CSM Member. Blackmon welcomed Frank Bryan as a new SSC member.
  2. Action Items from Last Meeting. Blackmon will schedule the Data Management Workshop in the spring 1998. Boville has sent by e-mail a draft for the CSL proposal that will be discussed later. The CSM Planning Document will be drafted, beginning with an outline that will be discussed with all CSM Working Group Co-chairs. Multiple authors will write the plan and an editor is needed. Blackmon discussed the carbon cycle issue with Bonan and Doney, and Dickinson discussed the carbon cycle issue with Jon Foley. A list of biases has not been produced. The costs of last year's working group meetings are not available, but a record is being kept now; all funds are being spent on CSM, as promised to NSF.
  3. Who Is Using CSM/CCM3 and Status of CSM's Portability? Problems of portability, Fortran 90 slowness, flux coupler problems, and who to contact in NCAR about the CSM were discussed. Another version of the CSM will be released in February 1998 for use on the CRAY. In March 1998 a more portable version of the CSM will be released. A section entitled "New Releases" will be put on the CSM Home Page stating information about future CSM versions, when they will be released, and on what computers they will run. A high priority was placed on all CSM web pages being reviewed frequently and being kept up to date, as they are the key interface to the community. Also, all CSM web pages will have an NCAR contact. Blackmon will call Foley and Kutzbach about problems they are having with the CSM.
  4. New Computers. A SGI Origin has been ordered, and the expected delivery date is April with production starting in May 1998. Fein discussed the new DOE Accelerated Climate Prediction Initiative (ACPI) and its relationship to the DOE Accelerated Strategic Computing Initiative (ASCI). The goal of ACPI is to acquire terraflop capacity for climate modeling by early 2000. Fein will keep the SSC informed about the initiative.
  5. New Ocean Model. Gent discussed scenarios for a new ocean model (see attached viewgraph): 1) NCOM, which needs code redesign for MPP machines; 2) MOM3, which needs additional parameterizations added and to be efficient on MPP machines; 3) POP, which needs different forcing fields and parameterizations added; and 4) a new ocean model, which would converge with other CSM codes by sharing superstructure architecture and dynamical core with the atmosphere model. It was recommended that POP be used in the short term and that in the longer term a new ocean code be designed. It was noted that Rick Smith will visit NCAR this summer, and he will work on the POP model at that time. It was also noted that SCD is making some changes to NCOM to be more efficient on the SGI Origin that NCAR will get later in the year.
  6. New Sea-Ice Model. It was recommended that we move to the EVP model developed at Los Alamos, and this will be discussed at the ocean and sea-ice working group meetings (see attached viewgraph).

  7. Biogeochemistry Working Group and Carbon Cycle Project. It was recommended that a Biogeochemistry Working Group be formed and that Inez Fung and Scott Doney be appointed co-chairs. Doney and Schimel are enthusiastic about starting up this group and Boville and Kiehl are also interested. This working group should interact with the Land Working Group. The first task is to develop a carbon cycle project.
  8. CMAP Scientific Advisory Council. It was recommended that the SAC meeting be held after the CSM Workshop every year.
  9. Outreach. Randall discussed the mutual benefits to U.S. research and operations that could derive if the research community and NCEP were able to use the same model. Researchers would benefit from the day-by-day close scrutiny and evaluation of operational forecasts, and the operational model would benefit by having a relatively large and distributed group of university and laboratory modelers focused on its development and improvement.
  10. Williamson gave a presentation on the discussions being held with NASA's Data Assimilation Office (DAO). A "very controlled" comparison of CCM3 physics and a numerical scheme developed by DAO will be discussed at the Atmosphere Model Working Group meeting on 2 and 3 March 1998.

  11. Seasonal-to-Interannual Issues. Shukla asked about the progress on these issues. Gent reported that McWilliams will work on a global upper ocean model while he is at NCAR on sabbatical from March through May 1998. He also reported that there is an effort at Los Alamos to incorporate sigma into POP. Gent said that presently the NCOM and the upper ocean model could be used for seasonal-to-interannual issues.
  12. CSL Proposal. There was much discussion of the best way to present the CSL proposal for CSM. Boville will take the lead by drafting how the proposal meets the criteria for use of the CSL and by drafting the science plan to show long-term scientific goals, accomplishments from last year, and short-term goals and estimated computing requirements for the seven highest priority projects that are: 1) Climate of the 20th Century (30,000 hours); 2) Climate of the 21st Century (25,000 hours); 3) Improved Component Models (75,000 hours); 4) Multi-century Control Simulation (30,000 hours); 5) ENSO Variability (10,000 hours); 6) Paleoclimate Applications (25,000 hours); and 7) Biogeochemistry (5,000 hours). The draft will be sent to the SSC by e-mail for comment and then submitted by e-mail to SCD by 27 February 1998. It was recommended that the high-resolution AMIP II experiment request be excluded from the proposal, and a control run be added to the proposal.