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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>
>
>
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Received on Fri Apr 25 2014 - 07:34:39 BST
