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Examine the supplied GRIB file era_t2m_jan_2014.grib. It contains low-resolution temperature fields (4x4 degree) from the ERA Interim data set for each day in January 2014 at time steps 00:00 and 12:00. Try the following in a new macro:
- compute the mean temperature field for the whole month
- separate the data into the two different time steps and compute the mean field for each. The end result should be two fields - one is the mean of all the 00:00 fields and the other is the mean of all the 12:00 fields.
- for each time step, compute the difference between the 2014 mean and the climatological mean computed earlier (you may wish to combine both macros into a single macro at this point)
- note that the two data sets are on different grids - you will need to change one of them to the other's grid
- plot the result (it should be two fields) with Contouring icons appropriate for showing temperature anomalies.
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