Diagnostic for calculating Lamb Weathertypes

[thomaskroi1996]

Hello everyone!

At the Wegener Center in Graz, Austria, we have been doing some research with Lamb Weathertypes for quite some while now, and recently started developing a diagnostic for ESMValTool to make things easier, and potentially be of use for others!

The features are:

Calculate the 27 Lamb Weathertypes over a region specified in the corresponding recipe
Plot means, anomalies as well as standard deviations for those weathertypes for psl, tas and prcp
Combining the weathertypes based on precipitation patterns over an area specified in the corresponding recipe as done here: https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020JD032824 (Table 2)
Create the same plots for those combined weathertypes

The weathertypes are calculated for ERA5 and model data, and the precipitation data for correlation calculations are taken from ERA5 and E-OBS.

The branch we are working on is called weathertyping_wegc.

We are happy to discuss this project with the community, get some feedback and features you would like to see!

Thank you very much and with kind regards,

Thomas Kroißenbrunner and Martin Jury

[valeriupredoi]

@thomaskroi1996 glad to see this in PR form, well done :clap: :beer: I can perform a technical review of it, but for a scientific review, I'd suggest we think who's the closest expert amongst us to perform the review. Just a couple questions before the review, please:

• are you happy to have this reviewed now, or you still working on it? If work is still to be performed, then I'd recommend you convert this PR to a Draft PR, and when it's ready, make it back ready for review;
• to find the best scientific reviewers, it'd be good if you could suggest one or more folks that already have experience with this type of diagnostic, if not maybe we can ask the list (scientific reviewers, which I can invoke via a GitHub tag)

Cheers :beer:

[thomaskroi1996]

@valeriupredoi Hey there! I am still doing some work, and definitely have to do all the tests, therfore I will convert it to a draft now, thank you so much! As for the 2nd point, I can talk to my supervisor next week, and then maybe we have some suggestions for scientific reviewers, in which case I will reply to you here again!

Cheers! 🍻