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Convert ERA-Interim 6 hourly to daily average

Karl
2018-02-01
2018-02-01
  • Karl

    Karl - 2018-02-01

    Hi,

    I have a total column water dataset (kg/m2) at every 6 hours (00Z, 06Z, 12Z, 18Z) for June-September [JJAS] 1979-2004 (for a total of 18544 datasets)

    I am trying to convert the 6 hourly data to a daily average which I have done using:

    ncea -d time,0,,4 in.nc out.nc

    The above command returned when i assume is a daily average (with a total of 4636 data) dataset.

    However I am not entirely convinced that this step above would give me an accurate total column water daily average (kg/m2/s1)

    I would like to know if the step i've taken is accurate or if there is a better way of doing this.

    Thank you for any help you can provide.

    Regards,
    Karl

     
    • Charlie Zender

      Charlie Zender - 2018-02-01

      Please read the manual on the difference between ncea and ncra. That command returned every fourth timestep, not the average of each four timesteps. Try, e.g.,
      ncra --mro -d time,,,4,4 in.nc out.nc

       
  • Karl

    Karl - 2018-02-01

    Hi Charlie,

    Thanks for the prompt reply, I have tried using the command you have provided but have been receiving a Memoty fault error.

     

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