Kalender

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.

Hi everyone, We’ll have our stormtracks group meeting this Wednesday (04.11) from 14:00 to 15:00 at U105. This week Kévin will present his work about - Internal variability in surface temperature over Europe, an ensemble analysis of CESM2-LENS2. The meeting will be hybrid and you can join remotely via Zoom: https://uib.zoom.us/j/62886269543?pwd=ajWbi97zr0hbniaoQdZkUtD2EUSSri.1 Meeting ID: 628 8626 9543 | Password: qSKTfKU3 The meeting schedule for this semester is in the following google doc: https://docs.google.com/document/d/1oLVVNtXjbjU3uNZ62qnXF8pcYbrCB34aUqUbDfnb2vo/edit?tab=t.0 Looking forward to seeing you all!:) Best, Birgit and Yangfan