Geopolitisk uro bidrar til lavere CO₂-utslipp i 2026

Abstract Moist convection is organized across a wide range of scales, yet many of the processes that modulate it are difficult to quantify from an Eulerian perspective. In this talk, I will show how the coupling between a cloud-resolving model and a Lagrangian particle model can be used to address this limitation. Lagrangian particles are particularly useful because they can encode the history of air parcels. I will first discuss what this approach reveals about the dynamics of precipitation-driven downdrafts and cold pools--arguably one of the least understood components of moist convection--and about the mechanisms by which cold pools can trigger and organize new convective cells. I will then show how this framework can be extended to stable water isotopes. Because each particle carries its own isotopic composition, changes along its trajectory can be attributed to individual processes, such as rain evaporation, equilibration, mixing, and surface fluxes. This reveals, for example, that surface latent heat fluxes, rather than entrainment, control the isotopic composition of cold pools, and it provides a process-based foundation for interpreting isotope observations of convection. Finally, I will briefly discuss how this framework might be applied to marine cold-air outbreaks over the North Atlantic and Nordic Seas. Speaker information Giuseppe Torri is an Associate Professor of Atmospheric Sciences at the University of Hawaiʻi at Mānoa. His research focuses on the dynamics and organization of moist convection, with particular interests in precipitating convection, its interaction with larger-scale circulations and, more recently, the dynamics of extreme weather. Much of this work relies on the application of Lagrangian particle models and water isotopes to obtain a process-based understanding of atmospheric phenomena that are otherwise hard to quantify. He also studies island hydroclimates across a range of spatial and temporal scales. He trained as a theoretical physicist, receiving his PhD from Imperial College London, before moving into atmospheric science as a postdoctoral fellow at Harvard University.

KUNNGJØRING PRØVEFORELESNING Institutt for geovitenskap Fakultet for naturvitenskap og teknologi Universitetet i Bergen Ph.d.-kandidat Jarle Børve Sleire holder prøveforelesning over følgende oppgitte emne for ph.d.-graden: Glacier retreat and emerging geohazards in a warming world Tid og sted: Fredag 13. november 2026, kl. 13.15 Auditorium 4, Realfagbygget Komité: Professor Kerim Hestnes Nisancioglu , Institutt for geovitenskap (leder for komiteen) Professor Henriette Linge, Institutt for geovitenskap Førsteamanuensis Chenliang Wu, Institutt for geovitenskap Adgang for interesserte tilhørere. VELKOMMEN!

Marianne Williams-Kerslake holder prøveforelesning 18. november kl. 10.00 over oppgitt emne: “Future and present freshwater pathways in the Arctic Mediterranean: impacts on the overturning circulation”. I prøveforelesningskomitéen er: Lars Henrik Smedsrud, leder Helene Asbjørnsen Kjetil Våge Veiledere: Helene R. Langehaug (hovedveileder) Annette Samuelsen (biveileder) Noel Keenlyside (biveileder) Prøveforelesningen holdes på Foredragssal 200. Studenter er også velkomne!