Re: Open Source Climate Modeling was Re: [asa] Crop Yields Face Non-Linear Effects Due to Climate Change

From: Rich Blinne <>
Date: Tue Sep 15 2009 - 08:54:29 EDT

On Sep 15, 2009, at 6:36 AM, Dave Wallace wrote:

> 128 bit float but some do, Power PC/AIX does and I can't remember
> but possibly Sun, Alpha or SGI as well.
>> Climate models are counter-intuitive in that they are less accurate
>> on shorter time scales than on longer ones. We want them accurate
>> at *all* time scales, short, medium, and long.
> How do we know they are more accurate on longer scales? How long is
> longer?

Through hindcasting the entire instrumental record of the 20th Century
was accurately reproduced. It's also accurate at the decadal time
scale. The year-to-year and month-to-month part is more dicey. With
the bigger and more accurate computer they want to extend it to 1000s
of years (1000 years back also is pretty good) and get the short-term
climate forecasts more accurate.

Rich Blinne
Member ASA

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Received on Tue Sep 15 08:55:27 2009

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