ESACCI SNOW CMORizer

[axel-lauer]

Description

This PR adds a downloading and a formatting script for the ESACCI SNOW v2.0 dataset. The following two variables are processed:

• daily snow area fraction (snc)
• daily snow water equivalent (snw)

Checklist

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• 🛠 This pull request has a descriptive title
• 🛠 Code is written according to the code quality guidelines
• 🛠 Documentation is available
• 🛠 Tests run successfully
• 🛠 The list of authors is up to date
• 🛠 All checks below this pull request were successful

New or updated data reformatting script

• 🛠 Documentation is available
• 🛠 The dataset has been added to the CMOR check recipe
• 🛠 The dataset has been added to the shared data pools of DKRZ and Jasmin by the @ESMValGroup/OBS-maintainers team
• 🧪 Numbers and units of the data look physically meaningful