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http://climateapps2.oucs.ox.ac.u ... _thread.php?id=3772
A few people have asked about why there are no more slab models, so herewith a short story.
Slab was to find stable values for the various parameters, for use in the next phase, 'experiment 2', (as mentioned in the basic Climate Science page to the left of here), which is also known as the Couple Ocean experiment. ('slab' refers to the fact that the ocean is a fixed object, and doesn't interact with the atmosphere.)
The scientists / researchers now have over 100,000 of these slab models.
One of the other needed variables are sulphate particles, and how they interact.
So two extra phases have been added to the standard slab model, in a similar manner to CO2: current levels of sulphates, and double this level.
It seems that the researchers have decided that the data they have received from the early models returned is interesting, and have asked for lots more of these models. So, to 'force' the processing of sulphur, the slab models have been 'turned off'.
Slab is still being processed by people, who, for one reason or another, can't run BOINC. And also by people doing the Open University's Climate course.
In an 'alpha/beta area', a few dozen people are running another part of the lead up to 'coupled ocean'; this is called 'spinup', and is a single phase, 200 year run. It trickles once per model month, (on my P4 3.2GHz machine running at 3.4GHz, every 68 minutes), and will take approx. 4 months to complete. And, from when I started, I have 2 months to do it. :(
So, sometime in February, the coupled ocean part of the project is expected to start. But I think that sulphur will continue for some time, to build up a large database of results.
And, just to depress people even more, the coupling between the ocean and atmosphere parts has proven very tricky to get stable, so if your computer isn't stable enough to run sulphur, you stand little chance of getting coupled to run.
So now is a good time to get computers fine tuned, and problems sorted out.
by Les Bayliss |
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发表于 2005-12-26 12:29:30
发表于 2005-12-26 17:38:38