Hi Jonathan, Karl, Jim and all,
Many thanks for your responses!
Honestly, I am a bit lost because of cell_methods. I think I need first
to read more attentively about it to understand your explanations... :)
If presence of "climatology_bounds" depends on cell_methods
modifications, then it seems me complicated logically:
we have "climatology_bounds" even if it is not a climatology case...
Best regards,
Natalia
On 04/24/2014 07:20 PM, Jim Biard wrote:
Natalie,
The example 7.13 would not work according to the CF standard if the
bounds were merely cell bounds. The cell_methods syntax "method within
interval" and "method over interval" are defined to apply only when
there is a climatology bounds. You are probably right that this isn't,
strictly speaking, a climatology case (I'm not a climatologist, so I
can't speak to that); but to achieve the result within the
conventions, you must use the climatology formalism.
Grace and peace,
Jim
On 04/25/2014 12:11 AM, Karl Taylor wrote:
Dear Natalia, Jonathan, and all,
I don't think "maximum (interval: 1 day)" would be explicit enough for
the variable "precipitation_amount". It wouldn't distinguish between
precipitation_amounts accumulated over each 24 hour period or some
shorter interval (say, from 8 to 11 each morning). With the use of a
climatological axis and bounds, I think the cell_methods would be
"time: sum within days time: maximum over days".
Hope others will confirm.
Best regards,
Karl
On 04/24/2014 06:43 PM, Jonathan Gregory wrote:
Dear Natalia
I think example 7.13 is acceptable. It uses climatological bounds because there
are two statistical operations. First, daily sums are accumulated. Second, the
maximum is computed.
However, I agree this is debatable and probably not ideal. It would be better
seen as an example of section 7.3.2, with a single statistical operation of
"maximum" and a cell_methods which recorded "(interval: 1 day)". Do you agree?
Best wishes
Jonathan
On 4/24/14, 9:22 AM, Natalia Tatarinova wrote:
Hello,
I have a question concerning the "Climatological statistics".
According to the CF ("Climatological statistics" section in the CF
document), there are 2 ways to derive climatological statistics:
1. "Climatological statistics may be derived from corresponding
portions of the annual cycle in a set of years" (corresponding
examples: 7.8, 7.9, 7.11 and 7.12).
2. "Climatological statistics may also be derived from corresponding
portions of a range of days, for instance the average temperature for
each hour of the average day in April 1997" (corresponding examples:
7.10).
There is also the example 7.13 (Monthly-maximum daily precipitation
totals) which doesn't correspond to these ways.
For me, to find max daily precipitation for each month is an usual
statistics, but not climatological. So, I think that the
"climatology_bounds" variable should be renamed to "time_bnds".
For example, in CMIP5 project monthly statistics derived from daily
variables have no "climatology_bounds" but "time_bnds" variable.
Could you enlighten me on this point, please?
Best regards,
Natalia
--
*Natalia Tatarinova*
CERFACS/Climate Modelling and Global Change
42 Av. Gaspard Coriolis,
31057, Toulouse, France
[email protected] <mailto:[email protected]>
--
*Natalia Tatarinova*
CERFACS/Climate Modelling and Global Change
42 Av. Gaspard Coriolis,
31057, Toulouse, France
[email protected] <mailto:[email protected]>
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