Hi.
I realized my reply went only to Natalia, so I'm repeating it for the group.
-------
Natalia,
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 4/24/14, 6:11 PM, 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 4/24/14, 9:43 AM, 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
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.
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