[Go-essp-tech] ok_min_mean_abs and ok_max_mean_abs
Charles Doutriaux
doutriaux1 at llnl.gov
Tue Nov 9 09:20:27 MST 2010
Martin,
I will definitely do 2.
Also I will edit the tables to set these min/max for monthly tables only.
I will see if I can run the script for other frequencies as well.
C.
On 11/9/10 8:15 AM, martin.juckes at stfc.ac.uk wrote:
>
> 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
>
>
>
> --
> Scanned by iCritical.
>
>
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