CCSM BGC Diagnostics

1
CCSM BGC Diagnostics

• Land Carbon Diagnostics Sub-group
• Co-Leads
• Inez Fung and Jim Randerson

2
IPCC AR5 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 AR5 report

3
June 2006 CCSM BGC WG meeting Breckinridge

• Common Path Qualifications
• Carbon models (or improvements to existing
  models) need to be in CCSM3 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

4
6/2005 Proposed Process for Assessing Land C
Models

• Start with C4MIP Phase 1 protocol (19th-20thC,
  prescribe SST)
• Carbon Diagnostics Task Force
• C models set-up in CCSM3 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

5
CCSM_LandC_MIP Models

• Terrestrial carbon codes coupled to CCSM
• IBIS (coupled to PCM Thompson et al 2004)
• CASA (coupled to CSM1.4 Fung et al. 2005 Doney
  et al. 2006),
• CN (coupled to CAM3-CLM3 Thornton)
• CCSM_LandC_MIP
• Climate model CCSM3.0_BGC_f_configuration
• Standard resolution T42 (2x2.5)

6
CCSM_LandC_MIP
Runs at ORNL
Format Model Output NetCDF Climate and Forecast
(CF) Metadata Convention http//www.cgd.ucar.edu/c
ms/eaton/cf-metadata)
Web display of output
Compile quality check C obs format in CF
convention
Archive output in CF convention at PCMDI
Archive C obs in CF at PCMDI
Common Software CDAT, Taylor diagrams...
Assessment
7
Assessment sensitivity testmodeled at Harvard
Forest
FCO2 (NEE)
TSA
SMOIST