I thought I'd start a thread for the return of this model. Retirement lost its attractions, I guess. ;-)

The explanation of why SM3 is being brought back surprises me. (But thanks for getting us one, Milo and Mo!) I'd have thought that testing for "linearity" of response to CO2 forcing would be almost the very first thing one would do, once one can run large ensembles. I'm surprised that it's happening as late as 2010. I hope there will be a page put up in the Experiments section soon.

My interpretation of the explanation is that the CO2 concentration in the last phase is being varied in the new experiment. In all previous experiments it was double the level in the second (pre-industrial control) phase.

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"The ultimate test of a moral society is the kind of world that it leaves to its children." - Dietrich Bonhoeffer

My interpretation of the explanation is that the CO2 concentration in the last phase is being varied in the new experiment. In all previous experiments it was double the level in the second (pre-industrial control) phase.

The HadSM3 tasks I've downloaded confirm this.

They all have the parameter CO2 mass mising ratio for phase 3 (shouldn't that be mixing rather than mising?) set to 7.4E-4 (default 8.8E-4) and different values for the initial condition parameter.

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"The ultimate test of a moral society is the kind of world that it leaves to its children." - Dietrich Bonhoeffer

... the doubling being a common definition of climate sensitivity.

I see in “Tasks Ready to Send” that the count for HadSM3’s is again 0. Is this the end or will they be generating more? If it is the end I will reset my preferences for “Famous” (as that seems to be the only thing available now).

P.S. How are those very briefly available (to briefly for me to snag one) CM models doing? Are there going to be more?

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This was yet another iteration of Slabs. We started with them in 2003 and they crop-up occasionally. I'd be among the last to suggest that we'll not see more of them at some unforeseeable time -- when a new set of perturbations might be useful for another study. Meanwhile, for now, they are history. Again.

Not necessary to reset your Preferences. When nothing is available for a selected flavor, it will be ignored by the server.

The Regional Models that appear sporadically are hard to snag. It all depends on whether the server grabs one to place into the queue and whether that slot is among those available when you request work.

I used to think that everything listed was in the queue. Not so. The queue is merely 100 (default) Tasks long. Luck of the draw.

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"We have met the enemy and he is us." -- Pogo
Greetings from coastal Washington state, the scenic US Pacific Northwest.

the parameter CO2 mass mixing ratio for phase 3

Interestingly, only the HadSM3_uxxx_* series task web pages seem to show this parameter. The pages for the HadSM3_jxxx_* series models that my computers have run all show the traditional set of parameters for SM3s.

Some of the _uxxx_ series have less than the original amount of CO2, as well. The charts show a nice linear response: the phase 3 temperature is below the phase 2 temperature.

Three left to finish, and then it's back to Famous. Fun while it lasted.

Some of the models were probably controls.
Plus whatever else they're testing.

There will be some more of the HadCM3L at some point, assuming that after the physicist responsible has had a look at the results from the previous small batch she is satisfied.