1. Progress of Interactions Among CCSM and Other Modeling Efforts
Bill Collins
National Center for Atmospheric Research
Boulder, Colorado
Earth System Modeling Framework (ESMF)
National Centers for Env. Prediction (NCEP)
GFDL and GSFC (other attendees)

2. Interactions with ESMF Project
Clarification of CCSM’s reasons for adopting ESMF:
Enable incorporation of assimilation capabilities
Simplify construction of complex, hierarchical models
Facilitate development of single-executable CCSM
CCSM has adopted a thorough set of acceptance tests:
Test plan has been reviewed by SSC and WG co-chairs.
The first phase starts on Jan. 1, 2005, ends in Sep
CCSM and SCD are seeking to support ESMF:
We submitted a NASA MAP proposal in Nov
The proposal would support dedicated ESMF SE in CSEG.

3. Acceptance Test Plan for ESMF
Phases:
Test ESMF in stand-alone CAM & CLM.
Test ESMF in full CCSM.
Rationale for two-phase approach:
All ESMF functionality needed for CCSM is not yet ready.
Risk of resource commitment is minimized if we just test two components.
Stand-alone CAM has a much larger external user community than CCSM.
CAM is better instrumented for performance evaluation.

4. Components of the Phase 1 Plan
Quantitative acceptance metrics for:
Computational performance
Solution separation
Memory requirements
Qualitative survey metrics
Evaluation of ESMF-enabled code by:
Atmospheric Model Working Group
Land Model Working Group
Software Engineering Working Group

5. Other Criteria for Phase 1 Acceptance
Commitment to customer support
Long-term software produce support
Stability of software interfaces
Support on CCSM production platforms

6. Implications of a Successful Phase 1
ESMF will be incorporated into the CAM and CLM base code.
CSEG will begin phase 2 acceptance tests.
External CAM and CLM users will need to install ESMF.

7. Interactions with NCEP
Bill Collins visited NCEP in May 2004 for:
Two-day briefing on NCEP’s modeling activities
Discussions of possible collaborations
Results:
Agreement to use Don Johnson’s tests of dynamics
Agreement to explore climate model test-bed concept
Follow-up activities:
Phil Rasch (AMWG co-chair) attended conference on isentropic coordinates organized by Johnson and Randall.
Phil is working with Don on applying tests to FV dynamics.

8. Interactions with GSFC and GFDL
GSFC – comments from Michele Rienecker
GFDL – presentation by Isaac Held (2:15)