In 2017, researchers retrieved an eleven-metre-long sediment core from Lake Vangsvatnet in Voss. The core reveals 8,000 years of flood history in the community, west in Norway.

Hi all As mentioned earlier, the coming Carbon System meetings will focus on the Research Priorities in the new strategy for the Bjerknes centre. The aim is to develop activities on these Research Priorities. These activities will eventually be articulated in a Bjerknes activity plan, that will accompany the strategy. The meeting on the first Research Priority: Advance fundamental science on coupled Earth system processes, interactions, and feedbacks. We will deepen process-based insight into how the Earth system works– including coupled ocean–atmosphere phenomena, the carbon cycle and biogeochemistry, large-scale climate variability, teleconnections, and tipping elements – to constrain uncertainty and enhance confidence in projections of the evolution of the climate system. will take place October 22nd at 9-11 in the 4th floor seminar room west-wing GFI. We will have 3 presentations, to set the scene, and then an organized discussion on the Research Priority: on what we would like to focus on, what we can hope to achieve, and how we can better collaborate on this in our research theme and with the other research themes. The presentations are: Friederike Fröb: Approaching the edge? - The Earth system and carbon cycle response in TIPMIP-ESMs Timothée Bourgeois: Mitigating the fall? - (Marine) carbon dioxide removal experiments in ESMs Are Olsen: Knowing the truth? – Ocean sink uncertainties in the global carbon budget Best Are & Nadine

Abstract Katabatic storms in southeastern Greenland are fierce, density-driven downslope wind events that influence both local weather and downstream climate. We assess their representation across three generations of ECMWF global reanalyses (ERA5, ERA-Interim, and ERA40) and a hierarchy of Community Earth System Model version 2 (CESM2) simulations at different horizontal resolutions, using in situ observations and the 2.5-km Copernicus Arctic Regional Reanalysis (CARRA) as benchmarks. The global reanalyses systematically underestimate wind speeds by approximately 30% in ERA5 and 50% in ERA-Interim and ERA40, while failing to capture key storm structures. Similar biases occur in CESM2 simulations at standard 1–2° resolutions. In contrast, variable-resolution CESM2 configurations with local grid refinement to 0.25° and 0.125° better resolve Greenland's topography and substantially improve the representation of storm intensity and structure. Sensitivity experiments further demonstrate that resolving the steep ice-sheet margins is critical for capturing katabatic acceleration. The reanalysis data also reveal that these storms generate fast-moving, high-amplitude ocean wave packets that propagate as far downstream as Scandinavia and the British Isles. Accurately representing these storms in global models and reanalyses is therefore essential for simulating North Atlantic climate variability beyond Greenland's immediate coastal region. Speaker information Marcus Lofverstrom is an associate professor in the Department of Geosciences at the University of Arizona. His research group conducts novel research in the fields of atmospheric dynamics, (paleo-)climatology, and glaciology to understand the evolution of the climate system over multi-millennial time scales. Numerical modeling is an important component of his research program, and the group is utilizing models over a broad range of complexities: from conceptual and linear steady-state models to fully coupled state-of-the-art Earth-system models.