[cam-users] automatical daily average is different

[David Noone]

Hi Menglin,

Is it close? If your hourly data (h0) you output is instantaneous, the
average of these will be from 24 numbers, while the daily average output
(your h1) will be the averaged over each timestep (perhaps 20 minutes,
and thus involve 72 numbers). These should be pretty close for
"dynamics" fields (U, V, T, etc), but might differ somewhat more for
"physics" fields such as those computed from CLM, or boundary layer and
convection statistics. But still, I would hope the difference are small.

Regards,

David

On Fri, 16 May 2003, Menglin Jin wrote:

>
>  Hi,
>
>  I run CAM/CLM and save hourly data into the primary history tape(i.e.,h0).
>  Meanwhile, I get daily average output automatically on history tape h1.
>  However, I find the daily average saved on history tape h1 is different
>  from the daily average values that I calculated from hourly average.
>  What is wrong?
>
>
>  Thanks
>  Menglin
>
> ---------------------------------
> Menglin Jin, Ph.D.
> Assistant Research Scientist
> Meteorology Department
> University of Maryland, College Park, 20742
> mjin@metosrv2.umd.edu
> Office: 3411 Computer and Space Sciences Building
> Phone: (301)-405-8833
> fax: (301)-314-9482
> http://meto.umd.edu/~mjin/
>
>
>
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>

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