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New Abiotic-HOWTO -> Control Runs
The previously proposed Abiotic Control Run generated some controversy.
Opinions have ranged from the Control being vital to it being worthless.
In the new version of the Abiotic HOWTO (Revision 1.16), now available by
the OCMIP web page, I have changed things somewhat. Groups may make from
0 to 3 Control runs (1 each for the Historical, Future, and Pulse
The four rules below will help you determine, which if any of
the Control Runs you need to make, and if not, what you should
do to provide detailed drift information to the analysis center.
These rules are also detailed in the HOWTO (Section 5).
Under what circumstances should I make a control run?
1. If you will make the Pulse run, you MUST also make the equivalent Pulse
2. If you have NOT respected the Equilibrium drift criteria you MUST
make the Historical Control and Future Control runs.
3. If you have respected the recommended Equilibrium drift criteria,
you may skip making the Historical Control and Future
Control runs. However, I HIGHLY RECOMMEND that you make these
simulations, if you can afford them, i.e., if they do
not represent a large proportion of your annual CPU budget. Having
this output will simplify analysis and eliminate guess work.
4. If you have respected the Equilibrium drift criteria and choose not to
submit Historical Control and Future Control output, you MUST still
provide an indication of the drift of your model. In other words, you
must use the three *ctrlH* output routines (see Abiotic HOWTO) to
provide your output for another year. For instance, you could provide
output from the 0-D, 2-D, and 3-D *ctrlH* routines for the year 1775.
We would then compute your model drift and treat it as constant.
In any case, all modelers are encouraged to download the new version of
the Abiotic-HOWTO. Besides major changes related to the Control (in
sections 3, 4, and 5) That document also contains fixes to minor
inconsistencies concerning model output frequency and an updated section
regarding transfer of your model output.
Laboratoire des Sciences du Climat et de l'Environnement
Unite Mixte de Recherche CEA-CNRS
LSCE, CEA Saclay http://www.ipsl.jussieu.fr/~jomce
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