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2.3.2 Ocean Component Datasets
The ocean component can be run in one of two ways, as a data ocean model,
which reads input sea surface temperature data, or as a slab ocean model,
which computes SST's.
2.3.2.1 Running With the Data Ocean Component
Running the data ocean component requires a time-variant SST dataset. The
standard SST dataset contains 12 monthly time samples. The model can also
read multi-year SST datasets. The SST dataset is specified by namelist
variable BNDTVS.
An SST dataset on a 128 X 64 transform grid (T42) is provided with the
CCM3.6 dataset tar file. This dataset is named T42M5079.nc
2.3.2.2 Producing Initial Condition Datasets at Various Resolutions
In order to run the model at other horizontal resolutions, a utility
program has been included to create a SST dataset at whatever resolution
the user wishes. Directory ccm/tools/interpsst (created
when untarring ccm3.6.code.tar) contains code to interpolate a netCDF format
SST file to any gaussian 2-D grid specified by command-line arguments.
The user is referred to README files in the above directory for
further information and specific instructions on how to build and run these
utilities. An example sequence of commands to produce a horizontally
interpolated T21 SST dataset would be:
interpsst -x 64 -y 32 T42M5079.nc
sst.T21.nc
In addition to the standard T42 resolution SST file, the Shea, Trenberth,
Reynold (NMC/CAC) dataset STRsst2x2.nc has also been provided in
the ccm/tools/interpsst directory. This dataset uses the Reynolds
SST climatology (the COADS/ICE climatology) and includes improvements in
the regions of the Gulf Stream and Kurishio Current, i.e. reinstated more
realistic horizontal temperature gradients. (The T42 SST dataset
provided with the distribution was derived from the Shea, Trenberth, Reynold
dataset. )
2.3.2.3 Running with the Slab Ocean Model Component
This section documents an unsupported feature of the current distribution.
Code and full documentation will be provided in the future.
To configure the model to run with a slab ocean model requires the setting
of the cpp token COUP_SOM in the misc.h file. The SOM input
fields ocean mixed layer depth and ocean mixed layer heat flux are shown
below. These fields replace the sea surface temperature field of
the standard SST dataset. Mixed layer depths are specified from observations
and never change from one SOM run to the next. Mixed layer heat flux depends
upon a control run, and thus can vary from one SOM run to the next (the
user would need to calculate them unless the standard control is used).
Ocean mixed layer heat flux simulates deep water heat exchange and ocean
transport. The mixed layer depth and heat flux evaluation is described
fully in the model description (Kiehl et. al., 1996).
Table 2.9: Slab Ocean Model Time-Varying Boundary
Dataset Fields
|
History file Field Name
|
Variable Name
|
Description
|
|
Single Level Fields
|
| QO |
Q |
Ocean mixed layer heat flux (W/m2)
(12 monthly averages) |
| MLD |
ho |
mixed layer depth (m) (12 monthly averages) |
Sub Sections
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2.3.2.1 Running With the Data Ocean Component
-
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2.3.2.2 Producing Initial Condition Datasets at Various Resolutions
-
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2.3.2.3 Running with the Slab Ocean Model Component
-
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$Name: ccm3_6_6_latest2 $ $Revision: 1.48.2.1 $ $Date: 1999/03/25 21:38:06 $ $Author: erik $