[Go-essp-tech] ok_min_mean_abs and ok_max_mean_abs

[martin.juckes at stfc.ac.uk]

Hello Charles,

 

For some variables, e.g. meridional wind, the monthly mean values will
generally be much smaller than the daily values, and so won't give a
good indication of what values to expect.

 

I can think of two options - (1) do a scan of the AR4 archive at all
frequencies, (2) issue a guidance note saying this particular warning
should be ignored if there is reason to believe that the absolute values
of the monthly data are not a good guide. 

 

Cheers,

Martin

 

From: go-essp-tech-bounces at ucar.edu
[mailto:go-essp-tech-bounces at ucar.edu] On Behalf Of Charles Doutriaux
Sent: 09 November 2010 16:07
To: Karl Taylor
Cc: Denis.Nadeau at nasa.gov; go-essp-tech at ucar.edu
Subject: Re: [Go-essp-tech] ok_min_mean_abs and ok_max_mean_abs

 

As Karl mentioned, I got the max/min from looping over 20c3m models
"monthly" in AR4.

If anybody as better values please forward them to us we'll gladly put
them into the tables.

If anybody's interested I can search the code I used to search through
the whole AR4 archive.

C.

On 11/8/10 2:07 PM, Karl Taylor wrote: 

Hi Denis,

I'm copying Charles D. who I hope will check the following for
correctness.  As I recall:

The mean_abs value is the temporal and spatial mean of the absolute
values of a field (based on latxlon grid cell values, but not area
weighting these).  The mean_abs value specified in the CMOR tables is
based on monthly means produced by CMIP3 models.  It basically gives you
the typical magnitude of the values of the field.  If a model has a
number much smaller or much larger than the CMOR table value, then it
may be unrealistic (or if off by an order of magnitude or more, it
probably means the units are wrong.)

Charles can tell you how he got the "max" and the "min" that appear in
the table.

regards,
Karl

On 11/8/10 11:43 AM, Denis Nadeau wrote: 

Hi,
 
Do you know how the mean_abs found in CMOR tables were calculated for 
some variables?  Is there some documentation about this?
I get warnings from cmor2 API and would like to investigate further what

they mean.
 
Thanks,
Denis
 

 


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