• co-lead of the Southern Ocean Freshwater release model experiments Initiative (SOFIA)

• co-chair CLIVAR/CliC/SCAR Southern Ocean Region Panel (SORP) [2020-2023]

• member of GRISO working group Ice Forcing Ocean around Greenland

• POF-IV subtopic 2.3 sea level change center representative

• student advisor in physical oceanography 

• member of GEOMAR scientific council

• session chair at EGU General Assembly and other international conferences

• project principle investigator

ORCiD 0000-0002-0882-8780 or on ResearchGate

Research

I am fascinated by the ocean and its interaction with ice; I study mostly dynamical processes;  I am curious about mechanisms bridging and linking scales from a few hundred meters to thousands of kilometers, from months to centennials.

My research focusses on marine climate variability in both northern and southern high latitudes and related teleconnections. Themes catching my interest: 

• melting ice: Arctic sea ice retreats, Greenland's and Antarctica's ice sheets melt, and thus the ocean underneath, adjacent and beyond is forced to adjust. How does this adjustment look like and what are the consequences?

• ocean-ice-atmosphere dynamics: Interaction and feedbacks between these climate components in subpolar regions impact the overturning circulation of the ocean, which plays a key role in global heat redistribution. How do these feedbacks play out under rapid climate change?

• ocean eddies: The ocean is much more than a simple 'conveyor belt' and mesoscale (10-100km) eddies play a key role in redistributing heat and freshwater. Do climate models resolving these fetures respond differently to global warming?

• ocean extremes: While extreme weather is well known to everyone, ocean extremes have only recently attracted attention. Do rapid changes in ice melt trigger ocean extremes? Does the ocean have a memory for extremes?

• deep AMOC: Formation of deep and bottom water in Atlantic sector subpolar regions is strongly influenced by ocean-ice-atmosphere interaction and drives the Atlantic Meridional Overturning Circulation (AMOC) with competing influence on its strength. How does the ocean translate rapid change at the surfaec to low frequent variability in the deep?

My research is based on global climate modelling with particular focus on ocean and ice components. Besides applying such models to particular research questions, I am actively involved in their development and continuous improvement. I do care about the exchange with the observational community knowing that only by complementing each other we improve the understanding of ocean and climate processes.

Teaching and more

Teaching and supervising students is a valuable and fun part of my work. Being reminded of the fundamentals of, for instance, ocean dynamics while working on advenced research foci with complex models helps maintaining a broader picture of the climate system.

I recently discovered a new playing field: rotating tank experiments. Next to solving classic problems of the hydrodynamic equations analytically on the board and simple computer-based modeling, these provide a third way of connecting with atmosphere and ocean dynamics. Also, it's simply a humongous amount of fun to "play" with water, food coloring and ice cubes and—as a side kick—see the equations on the board unfold in the "little desk ocean".

Our experience and advances we share on a blog and at international meetings. The project has drawn quite some attention university wide and also led to a collaboration with the DIYnamics group who triggered our initiative by publishing their detailed instructions of a Lego-driven turntable.

On a different note, I am currently co-chair of the Southern Ocean Region Panel (SORP) of CLIVAR, CliC and SCAR. Key topics of our current agenda are: enhancing communication between the observational and the modeling communities, organizing joint modeling initiatives, and enhancing international data exchange.

I am also regularly chairing sessions at international meetings and co-organizing workshops on, for example, the Southern Ocean, ice-ocean interaction and high-resolution ocean modeling. [OSM2022, EGU2022, EGU2023]