CCSM BGC Diagnostics Land Carbon Diagnostics Subgroup CoLeads

CCSM BGC Diagnostics Land Carbon Diagnostics Sub-group Co-Leads: Inez Fung and Jim Randerson BGCWG_20060328

IPCC AR 5: 2012 -2013 • Coupled carbon-climate models: standard contribution from modeling groups • 2008 -2009: freeze model • 2009 -2011: execute runs • 2010 -2012: analyze • 2010 -2011: submit for publication • 2012 -2013: release AR 5 report BGCWG_20060328 2

June 2006: CCSM BGC WG meeting Breckinridge • Common Path Qualifications – – – • Carbon models (or improvements to existing models) need to be in CCSM 3 and codes and runs available to committee to be evaluated PI needs to be identified and able to improve model in the long term future Code needs to meet computer time and code requirements for CCSM Form a subgroup on terrestrial C diagnostics for assessing/validating C modules coupled to the CCSM BGCWG_20060328 3

6/2005: Proposed Process for Assessing Land C Models – – Start with C 4 MIP Phase 1 protocol (19 th-20 th. C, prescribe SST) Carbon Diagnostics Task Force: • • C models set-up in CCSM 3 framework (data ocean ? ) (Lead: F. Hoffman et al. ) Define standard set of model output (Lead: Define metrics for assessment (Lead: Schimel? ) Compile observations into format amenable for comparing with models (collab with Land WG; Lead: Running? ) PCMDI style model-model comparison (Lead: Curt Covey et al. ) Post results on BGC Diagnostics website (who? Report on progress/results at 2006 BGC WG mtg BGCWG_20060328 4

CCSM_Land. C_MIP: Models • Terrestrial carbon codes coupled to CCSM: – IBIS (coupled to PCM; Thompson et al 2004) – CASA’ (coupled to CSM 1. 4; Fung et al. 2005; Doney et al. 2006; ), – CN (coupled to CAM 3 -CLM 3; Thornton) • CCSM_Land. C_MIP: – Climate model: CCSM 3. 0_BGC_f_configuration – Standard resolution: T 42 (2 x 2. 5) BGCWG_20060328 5

CCSM_Land. C_MIP Expt Protocol Runs at ORNL Web display of output Model Output Format Model Output: Net. CDF Climate and Forecast (CF) Metadata Convention http: //www. cgd. ucar. edu/cms/eaton/cfmetadata) Archive output in CF convention at PCMDI C Obs Compile & quality check C obs; format in CF convention Archive C obs in CF at PCMDI Common Software: CDAT, Taylor diagrams. . . BGCWG_20060328 Assessment 6

Assessment: sensitivity test modeled at Harvard Forest FCO 2 (NEE) SMOIST BGCWG_20060328 TSA 7