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  1. JASMIN CIS
  2. JASCIS-220

Colocation ECHAM with pressure onto NCAR RAF with altitude has no data.

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Not going to be addressed
    • Affects Version/s: None
    • Fix Version/s: DummyVersion
    • Component/s: None
    • Labels:
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      Description

      This is an example from the GASSP case study.

      We want to colocate ECHAM (with pressure) onto GASSP flight tracks (with altitude). Since pressure and altitude are not the same dimensions we expect them to be ignored and only colocation onto lat, lon, time to take place.

      The ECHAM file is first subset on time to make it a manageable size.

      cis subset mmrbc:/group_workspaces/jasmin/cis/data/ECHAM/2008_3D_3hr/ECHAM6.1-HAM2.2_GLOFIR1_2008_mmrbc.pl.nc t=[2008-03-29T18:00:00,2008-03-30T05:00:00] -o subset_echam_time.nc

      Then we colocate onto GASSP:

      cis col mmrbc:subset_echam_time.nc /group_workspaces/jasmin2/gassp/creddington/Processed_data/Level_1/ARCPAC2008/SP2_mrg60_NP3_20080*.nc:colocator=lin -o model_time_onto_gassp.nc

      We find that the output has only missing values in it, even though there should be matching data.

      Subsetting the ECHAM to a single pressure level actually gives us the required colocation data:

      cis subset mmrbc:/group_workspaces/jasmin/cis/data/ECHAM/2008_3D_3hr/ECHAM6.1-HAM2.2_GLOFIR1_2008_mmrbc.pl.nc t=[2008-03-29T18:00:00,2008-03-30T05:00:00],z=[10000] -o subset_echam_time_press.nc

      I think the gridded subsetting makes length one coordinates scalars so this gets ignored and the colocation is allowed to work OK. This is not the right behaviour though, the colocation should just ignore the pressure anyway since the GASSP data doesn't have any pressure data in it. I guess that pressure and altitude are getting confused or something.

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            Assignee:
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            Reporter:
            matthew.kendall@tessella.com Matthew Kendall
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              Updated:
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