The Community Climate System Model

Peter Gent

Chairman

CCSM Scientific Steering Committee

Maurice Blackmon Symposium

October 29, 2007

Two (slightly out of focus) CGD Directors

SST from the CSM 1 run made in fall 1996

from Boville and Gent, J Climate, 1998

CSM 1 was the first climate model to produce a non-drifting control run without “flux corrections”

Sea Ice area was also stable, with a good simulation, especially around Antarctica

The ocean transported the correct amount of heat because the “flux corrections” didn’t transport any

Evolution of CCSM

J. Climate, 1998(Boville and Gent, 1998)

CSM 1.0 June 1996

Kiehl and Gent, 2004 CCSM 2.0 May 2002

New ocean, land, sea-ice modelsNew physics in atmospheric model

J. Climate, 2006(Collins et al., 2006)

IJHPCA, 2005

CCSM 3.0 June 2004

New physics in all components

J. Climate Special Issue

J. Climate Special Issue devoted to CCSM3: Vol 19, No 11, June 1, 2006

• 26 papers SSC (1) Atmosphere Model (6) Ocean Model (4) Land Model (2) Climate Change (2) Climate Variability (4) Polar Climate(4) Paleoclimate (3)

• 510 pages

• Authorship 51 NCAR 48 External

The International Journal of High Performance Computing Applications

• Objectives Describe Software Engineering for

climate models

Document performance and portability

• 13 papers published in Fall 2005, Volume 19, Number 3

• Authorship 32 External 9 NCAR

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

US University developers of the CCSM

Twenty-two institutions currently:

• Carnegie Institution• Center for Ocean-Land-Atmosphere Studies• Colorado State University• Georgia Institute of Technology• Lamont Doherty Earth Observatory/Columbia• Massachusetts Institute of Technology• Princeton University• Scripps Institution of Oceanography• State University of New York / Stony Brook• University of Arizona• University of California, Berkeley• University of California, Irvine• University of California, Los Angeles• University of California, Santa Cruz• University of Colorado• University of Illinois• University of Kansas• University of Miami• University of Texas• University of Washington• University of Wisconsin• Woods Hole Oceanographic Institute

NCAR

INEZ FUNG

2007 CCSM

Distinguished

Achievement

Award

Control Neale+Richter

HadiSST Obs

CCSM Advisory Board Meeting

at NSF in November 2003

THANKS MAURICE

HAPPY FISHING