Hi Charlie, I think the only guidance CF provides is:
"The time coordinates should be values that are representative of the climatological time intervals, such that an application which does not recognise climatological time will nonetheless be able to make a reasonable interpretation"
I think for your case any consecutive dates within the climatological period would do, but like you I'd probably choose the middle year (or perhaps the first year, as in the example).
Hope others will correct me if I'm wrong. Karl On 4/29/15 5:11 PM, Charlie Zender wrote:
Dear CF'ers, The draft 1.7 conventions example Example 7.8. Climatological seasons has the following for the time coordinate: time="1960-4-16", "1960-7-16", "1960-10-16", "1961-1-16" ; All else being equal, are the values time="1975-4-16", "1975-7-16", "1975-10-16", "1976-1-16" ; also be acceptable for this same example? The underlying question is whether there is permissible ambiguity in the time coordinate values, or if for some reason the beginning year (1960) must be used as in this example. An alternative choice that seems reasonable to me is the use of the midpoint year (1975). I'm unsure whether 1960 was chosen arbitrarily or because one is expected to apply the minimum operation discussed in this example (seasonal minimum temperature) to the values of the time coordinate as well. Thanks, Charlie
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