Dear colleagues, we are happy to announce the first *hybrid - that is, in person with online streaming -* talk of the (PMS)^2 series: Speaker: *Carina Geldhauser* (Lund University) Title: *Discrete models for atmospheric turbulence* Abstract: In this talk we discuss a family of discrete models for atmospheric turbulence, often called point vortex models. Point vortices provide an approximation of solutions to generalized surface quasi-geostrophic models, a family of fractional PDEs which interpolate between 2D Euler equations and the more irregular SQG equation. We state some of its basic properties and see how variational methods and tools from probability theory together can help us to obtain more information about turbulence phenomena. The content of this talk is based on work in collaboration with Marco Romito (Uni Pisa), the presentation tries to avoid technicalities and to be accessible to a mixed audience. Date and time: *Monday October 25, 14:30-15:30 (Rome time zone)*, mind the change with respect to previous talks Place: *Sala di Rappresentanza (ground floor), Dipartimento di Matematica, Università degli Studi di Milano, via Saldini 50, 20133 Milano* *Zoom link:* https://us02web.zoom.us/j/5772228296 This is a talk of the *(PMS)^2: Pavia-Milano Seminar series on Probability and Mathematical Statistics* organized jointly by the universities Milano-Bicocca, Pavia, Milano-Politecnico and Milano-Statale. For more information see the dedicated webpage: https://paviamilanoseminars.wordpress.com/ Participation is free and welcome! The number of participants in person is limited, but we expect the limit not to be reached. However we advise people who are not from Milan or Pavia to write to us if they want to participate in person. Participants in person need to have the "green pass" or the EU digital covid certificate; a scanner will measure body temperature at the entrance of the building. Best regards The organizers (Mario Maurelli, Carlo Orrieri, Maurizia Rossi, Margherita Zanella)