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The Community Climate System Model (CCSM): An Overview Jim Hurrell Director Climate and Global Dynamics Division [email protected] Climate and Ecosystem Community Planning Meeting November 2-3, 2005 Boulder, CO The Community Climate System Model • A comprehensive climate model to study the Earth’s Climate. • Widely used to investigate the mechanisms of seasonal, interannual and longer-term variability. • Explore the history of Earth’s climate. • Estimate the future of the environment for policy formulation. http://www.ccsm.ucar.edu Evolution of CCSM J. Climate, 1998 (Boville and Gent, 1998) CSM 1.0 June 1996 New ocean, land, sea-ice models New physics in atmospheric model Kiehl and Gent, 2004 CCSM 2.0 May 2002 New physics in all components J. Climate, 2006 (Collins et al., 2006) IJHPCA, 2005 CCSM 3.0 June 2004 Configuration of NCAR CCSM3 Atmosphere (CAM 3.0) T85 (1.4o) Land (CLM 3.0) T85 (1.4o) Coupler (CPL 6) Ocean (POP 1.4.3) (1o) Sea Ice (CSIM 4) (1o) Standard Configurations T31 x 3 T85 x 1 T42 x 1 To facilitate its application, CCSM has been ported to both vector and scalar supercomputers as well as Linux clusters On an IBM SP4 system, the low, intermediate and high resolution configurations require 62, 292, and 1146 CPU hours to simulate one year (Yeager et al. 2006) Organization of the CCSM Project CCSM SSC Atmosphere Model Working Group Paleoclimate Working Group Ocean Model Working Group CCSM Advisory Board Land Model Polar Climate Working Group Working Group Climate Variability Biogeochemistry Climate Change Working Group Working Group Working Group ChemistryClimate Working Group Software Engineering Working Group Contributions to IPCC Fourth Assessment • Three phases: – Pre-industrial (1870) – 20th Century (1870-2000) – Emissions Scenarios • SRES Scenarios: – Commitment (20th C. CO2) • 2000-2100 (8 runs) • 2100-2200 (4 runs) – A1B and B1 Scenarios • 2000-2100 (8 runs) • 2100-2200 Const (5 runs) • 2200-2300 Const (1 run) – A2 Scenario • 2000-2100 (8 runs) A1B B1 Commitment Contributions to IPCC Fourth Assessment • Output: 10 GB/simulated year • Data volume for IPCC: ~100 TB • Largest contribution of any model • Eight ensemble members at T85 for each experiment • Data available online: • PCMDI (IPCC archive) • ESG (Control) • Original history tapes: SCD • Diagnostics on line (web) CCSM J. Climate Special Issue (http://www.ccsm.ucar.edu/publications/jclim04) • Objectives Describe CCSM3 to the climate community Document CCSM3 for IPCC FAR • Topics Overview of CCSM3 Description of climate state for each component model Responses (paleoclimate; pre-industrial; 20th & 21st Century) Major modes of coupled variability Climate sensitivity Recent Science Highlights CCSM J. Climate Special Issue • 26 papers SSC (1) Atmosphere Model (6) Ocean Model (4) Land Model (2) Climate Change (2) Climate Variability (4) Polar Climate(4) Paleoclimate (3) • 680 pages (estimated) • Authorship 51 NCAR (22 lead authors) 48 External CCSM Simulation Improvements Improved SLP Teleconnections to ENSO 99% sig. Recent Science Highlights CCSM IJHPCA Special Issue • Objectives Describe SE for climate models Document performance and portability •14 papers submitted • Authorship 14 NCAR (3 lead authors) 27 External