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CSM Experiment Series g007

Active Models: sea-ice & ocean
Data Set Models: atmosphere & land

When run: Sep 1997

Models used:

  • a "data set" atm model, datm4.alpha1 (using daily avg data from an uncoupled CCM3+LSM)
  • the NCAR CSM Sea Ice Model, csim 2.2.1
  • a "data set" lnd model, dlnd4.alpha1 (using daily avg data from an uncoupled CCM3+LSM)
  • the NCAR CSM Ocean Model, NCOM 1.3.patch1
  • the NCAR CSM Flux Coupler, cpl 4.alpha2

    Synopsis:
    This ice + ocn spinup run provides the initial conditions for a fully active "Twentieth Century" coupled run (see case b007 ). The ocn and ice models are at a (nominal) 2x2 degree resolution and the atm and lnd models are at a T42 resolution. The data file atmosphere model provided the coupler with daily average fields from an uncoupled CCM3 run.

    Computer Resources:
    This simulation required almost XXX CPU hours on a Cray C90. with a 4.2 nano-second clock. When the ocean code ran in accelerated mode (years 1 thru 49), XXX CPU hours per simulated year were required. When the ocean code ran in synchronous mode (years 50 thru 60), XXX CPU hours per simulated year were required. In either case, 69 mega-words of main memory were required.

    Diagnostics:
    1. Time series of ice volumes and areas
    2. Time series of level-averaged potential temperature
    3. Time series of level-averaged salinity


    Table of g007.nn runs:

    Date Case Description Start/End Owner
    g007 ocn+ice spinup for fully coupled Twentieth Century run
    Sep 97 g007.03 atm: /fs/cgd/csm/models/atm/datm4.alpha1
    ice: /fs/cgd/csm/models/ice/csim2.2.1
    lnd: /fs/cgd/csm/models/lnd/dlnd4.alpha1
    ocn: /fs/cgd/csm/models/ocn/ncom/src1.3.patch1
    cpl: /fs/cgd/csm/models/cpl/cpl4.alpha2
    MS dir: /HECHT/csm/g007.03/[ice,ocn,cpl,log]/*
    NQS dir: ~hecht/csm/nqs/g007.03
    Noteworthy:
  • atm sends daily avg data to Coupler (CCM3 output)
  • cpl forces E+P=0 over open ocn + ice
  • year 1: solar albedo feedback is off (in atm)
  • year 1: 2 wk avg on ocn forcing is on (in cpl)
  • year 1: ocn is in accelerated mode
  • year 25: solar albedo feedback is switched on
  • year 50: 2 wk avg on ocn forcing is switched off
  • year 50: ocn switched to synchronous mode
  • year 60: provides ice & ocn ICs for case b007.nn
  • 0001-01-01
    thru
    ??
    M. Hecht