Changes between Initial Version and Version 1 of Ticket #156


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Timestamp:
12/23/16 02:45:16 (3 years ago)
Author:
martin.juckes
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  • Ticket #156 – Description

    initial v1  
    1 Ticket #145, now accepted, proposes a new attribute, `external_variables`, to indicate when a variable referred to in the `cell_measures` attributes is in another file. This ticket relates to masks and area fractions used in the `cell_methods` attribute which may be associated with another variable. For instance, if we have `cell_methods = area: mean where sea_ice` and, in another file, a variable `siconc` which contains the sea ice area fraction. At present, there is no way within the convention to indicate, in the file containing the `cell_methods` statement, that the variable `siconc` is supplied separately.
     1Ticket #145, now accepted, proposes a new attribute, `external_variables`, to indicate when a variable referred to in the `cell_measures` attributes is in another file. This ticket relates to masks and area fractions used in the `cell_methods` attribute which may be associated with another variable. For instance, if we have `cell_methods = area: mean where sea_ice` and, in another file, a variable `siconc` which contains the sea ice area fraction. At present, there is no way within the convention to indicate, in the file containing the `cell_methods` statement, that the variable `siconc` is supplied separately.  In earlier CMIP archives it was reasonably easy to determine when a mask or area fraction was available for a particular cell methods operation. For CMIP6 this is not so easy, as there are a substantial number of area fraction arrays covereing different aspects of the cryosphere and land surface.
    22
    33The proposal is to allow the `external_variables` attribute to include terms of the form `sea_ice:siconc` to indicate that an `area_type` has an associated variable in an external file.