[CF-metadata] weighted time mean vs. conditional time mean.

From: martin.juckes at stfc.ac.uk <martin.juckes>
Date: Tue, 15 Mar 2016 22:39:39 +0000

Hello,

We have two similar but distinct temporal averaging use cases in the CMIP6 data request and I'd be grateful to some advise about CF encoding.

(1) Grid cells have a temporally varying sea-ice fraction, and a mean is wanted over the sea-ice area.

Is this a correct cell_methods formulation:
"time: mean where sea_ice area: mean where sea_ice"?

(2) Grid cells which sometimes have convective cloud, and a mean is wanted over the times when there is a cloud in the cell. The variable to be averaged is, in this case, the minimum over the cell of the convective cloud base.

Is this the correct cell_methods:
"time: mean where convective_cloud area: minimum"?

In the first case the first case "mean where sea_ice" refers to the portion of grid cells have sea_ice, in the 2nd "mean where convective_cloud" would refer to whole cells ... is this OK?


cheers,
Martin
Received on Tue Mar 15 2016 - 16:39:39 GMT