Outsource Degree Day Calculation

[hagento]

The calculation of HDDs and CDDs in mredgebuildings is currently performed by a mixture of R/calcHDDCDD.R and other external scripts.

Specifically, due to high memory requirements, the former is currently restricted to calculating annual degree days for a period of ~10 years for one SSP (population), one RCP scenario and the data input of one GCM. In consequence, we currently require ~350 separate runs to cover RCP1.9-RCP8.5 for projections of 5 GCMs. External scripts then post-process (e.g. model mean, smoothing) the outputs.

To increase methodological transparency and user-friendliness, the calculation of degree days shall be outsourced in a separate pik-piam package. This shall include the following features and improvements:

• integrated processing framework that coordinates the submission of SLURM jobs and post-processing of the their outputs
• choice between near-surface air temperature or BAIT as ambient temperature variable
• customization of absolute values and std's of threshold temperatures
• choice of SSP scenario(s) (for socio-economic drivers) determines range of considered RCP scenarios (according to IPCC's scenario matrix; see below)