Description

This PR add the recipe ref/recipe_ref_siextent_seasonal.yml to calculate the seasonal cycle of Arctic and Antarctic sea ice extent for REF.

The new recipe requires

• a fix of the ESMValCore derivation script for sea ice extent (Fix derivation for sea ice extent (siextent) ESMValCore#2648)

• the reference dataset ESACCI-SEAICE (CMORizer for ESACCI-SEAICE #3821)

• Closes Arctic/Antarctic sea ice extent (seasonal cycle) REF #3890

Checklist

It is the responsibility of the author to make sure the pull request is ready to review. The icons indicate whether the item will be subject to the [🛠 Technical][1] or [🧪 Scientific][2] review.

• [🛠][1] This pull request has a descriptive title
• [🛠][1] Code is written according to the code quality guidelines
• [🛠][1] Documentation is available
• [🛠][1] Tests run successfully
• [🛠][1] The list of authors is up to date
• [🛠][1] Any changed dependencies have been added or removed correctly
• [🛠][1] All checks below this pull request were successful

New or updated recipe/diagnostic

• [🧪][2] Recipe runs successfully
• [🧪][2] Recipe is well documented
• [🧪][2] Figure(s) and data look as expected from literature
• [🛠][1] Provenance information has been added