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CSM Experiment Series b006 (Increasing CO2 scenario)

Active Models: sea ice, ocean, atmosphere/land
Data Set Models: none

When run: March 1997

Models used:

  • the NCAR CCM atmosphere model, CCM3.2
  • the NCAR Land Surface Model, version 1
  • the NCAR CSM Sea Ice Model, CSIM-3.5.3
  • the NCAR CSM (global) Ocean Model, NCOM-1.1
  • the NCAR CSM Flux Coupler, drv-3.a.2

    Downloadable data:
    Time series of all single level atmospheric fields

    CSM b006 Synopsis:
    CSM b006 is a 130 year transient increasing CO2 simulation.

    The simulation was performed in Japan through a collaboration between NCAR and the Central Research Institute of the Electric Power Industry (CRIEPI), based in Tokyo, Japan. CRIEPI provided the financial support for computer time as well as technical assistance. The model integration was performed on a 32-processor SX-4 supercomputer at the NEC Laboratory in Fuchu, with assistance from NEC's U.S. subsidiary, HNSX Supercomputers . The Sony Corporation also provided a new high-density tape drive used by CRIEPI to store data and ship it to NCAR for archival on the mass storage system.

    The April 1997 NCAR Science Briefing describes this highly successful collaborative experiment in greater detail.

    The run was initialized from year 15 of the b003 300 year CSM control run.

    For the first 10 year (years 15-24), the CO2 level was held constant at the present day CO2 level (355ppm) used in the b003 control run) to ensure that the climate of the model had not been altered by the small numerical changes resulting from the port of the code to the NEC SX-4/32 .

    At year 25, a 1% per year increase in the CO2 level was initiated. CO2 Doubling was achieved in year 0095 and tripling occured at in year 0135. The integration was halted at the end of December of year 145.





    Some results:

    Accessing simulation output data:

  • Daily data from the b006 atmosphere model (years 0015-0025 and 0095-0105)
  • 6-hourly data from the b006 atmosphere model (years 0015-0025 and 0095-0105)

    Accessing post-processed output data:
  • From the b006 atmosphere model (years 0015-0144)
  • List of b006 atmosphere Fields

    Table of b006.nn runs:

    Date Case Description Start/End Owner
    b006 CSM 1%/year increasing CO2 experiment
    Mar 97 b006.01 MSS dirs:
    /SOUTHERN/csm/b006.01/[ccm3,ice,ocn,drv,log]/*
    /HECHT/GLOBAL/D02L45T2/csm-b006.01/ncdf (for ocean; see warning below)
    Noteworthy:
  • WARNING: The raw files for this run are in plain FORTRAN binary format, not COS blocked!!!
  • Branch model from 0015-01-01 of b003.01
  • CO2 is held constant at 355ppmv for the 1st 10 years
  • CO2 increase begins 0025-01-01
  • 0015-01-01
    thru
    0024-12-31
    L. Buja
    Mar 97 b006.02 MSS dir:
    /SOUTHERN/csm/b006.02/[ccm3,ice,ocn,drv,log]/*
    /HECHT/GLOBAL/D02L45T2/csm-b006.02/ncdf (for ocean; see warning below)
    Noteworthy:
  • this is a continuation of b006.01...
  • 0025-01-01
    thru
    0094-12-31
    L. Buja
    Mar 1997 b006.03 MSS dir:
    /SOUTHERN/csm/b006.03/[ccm3,ice,ocn,drv,log]/*
    /HECHT/GLOBAL/D02L45T2/csm-b006.03/ncdf (for ocean; see warning below)
    Noteworthy:
  • this is a continuation of b006.02...
  • 0095-01-01
    thru
    0104-12-31
    L. Buja
    Mar 1997 b006.04 MSS dir:
    /SOUTHERN/csm/b006.03/[ccm3,ice,ocn,drv,log]/*
    /HECHT/GLOBAL/D02L45T2/csm-b006.04/ncdf (for ocean; see warning below)
    Noteworthy:
  • this is a continuation of b006.03...
  • 0105-01-01
    thru
    0139-12-31
    L. Buja



    Data condensations of the b006 data:

    Date Case Description
    b006 CSM 1%/year increasing CO2 experiment
    Mar 97 b006 monthly averages collected by decade (on the NCAR MSS)

    /SOUTHERN/csm/b006/ccm3/hist/0015-0024
    /SOUTHERN/csm/b006/ccm3/hist/0025-0034
    ... thru ...
    /SOUTHERN/csm/b006/ccm3/hist/0115-0124
    /SOUTHERN/csm/b006/ccm3/hist/0125-0134

    Note: These are 1.2 gbytes each.
    May 97 b006 Surface quantities(on the CGD suns)

    /data2/csm2/b006/ccm3/surf1.0015-0024.nc
    /data2/csm2/b006/ccm3/surf1.0025-0034.nc
    ... thru ...
    /data2/csm2/b006/ccm3/surf1.0125-0134.nc
    /data2/csm2/b006/ccm3/surf1.0135-0140.nc

    Variables: PS, TS, DMI, TAH, FRM, FCO2, PSL, ORO, CLDHGH, RSW, BEVAP, CLDLOW, FMICR, CLDMED, FCEV, LHFLX, PBLH, CLDTOT, FGEV, QDRAI, BTRAN, PRECL, PRECC, CNVCLD, FRMF, SHFLX, QINFL, FCTR, FSDS, TREFHT, TAUGWX, TAUGWY, TGRD, NDVI, FLNS, FLNSC, PHIS, FLNT, FLNTC, TVEG, SOLIN, FPSN, QPERT, FSNS, FSNSC, QFLX, TPERT, FSNT, FSNTC, QOVER, USTAR, SRFRAD, LWSH, TSOI3, TSOI4, TAUX, TAUY, SNOWH
    Oct 97 b006 20 year averages of oceanic variables (on the NCAR MSS)

    /HECHT/GLOBAL/D02L45T2/csm-b006/ncdf/cmip2_diag.nc
    /HECHT/GLOBAL/D02L45T2/csm-b006/ncdf/cmip2_prog.nc

    Note: Files contain four averages of 20 years each, spanning the first 80 years of CO2 increase. Comparable data from the control case will be found in
    /HECHT/GLOBAL/D02L45T2/csm-b003/ncdf/cmip2_diag_control.nc
    /HECHT/GLOBAL/D02L45T2/csm-b003/ncdf/cmip2_prog_control.nc
    All four of the files were provided to CMIP2.

    contents of diag file: meridional overturning streamfunctions, northward heat transport.
    contents of prog file: vertically integrated mass transport streamfunction, the temperature and salinity fields, and the bathymetry.

    Warning: There was a bug in the calculation of the "Total" entry in the northward heat transport (which goes by the name "Tttn_basins"). The "Eddy Advection" has been added in twice. To get the total transport one must either take the sum of "Total Advection" and "Total Diffusion", or, equivalently, take the difference of "Total" and "Eddy Advection".