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CST_RFTemp: Temperature downscaling using lapse-rate or delta-bias correction compared to fine-scale climatology

Merged Jost von Hardenberg requested to merge rftemp into master

This branch implements the new function CST_RFTemp. It can be used to donwscale temperatures using two approaches:

  1. using a provided fine-scale orography and a fixed lapse rate
  2. using a provided fine-scale reference climatology (e.g. ERA5 at 25km or EOBS) and applying a delta bias correction to model data interpolated to fine scale.

The delta to be applied can be precomputed in order to allow out-of-sample applications (e.g. computing delta from a past fine-scale observational climatology and applying it then to future forecasts). Appropriate tests are implemented. Closes #41 (closed)

Edited by Jost von Hardenberg