Kjellsson, Joakim

Dr. Joakim Kjellsson

Now at Rossby Centre, SMHI, Sweden

E-Mail: jkjellsson(at)geomar.de

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Research interests

Climate change adaptation (Northern European Enclosure Dam)
Extreme weather events
Air-sea interactions
Kinetic energy budgets in ocean models and the impact of horizontal resolution
Tracing air- and water masses using Lagrangian trajectories

History

2005-2009: Undergraduate studies in Meteorology at Stockholm University
2009-2014: PhD studies in Atmospheric Sciences & Oceanography at Stockholm University
2014-2016: Postdoc at British Antarctic Survey, Cambridge, UK
2016-2017: Postdoc at Atmospheric, Oceanic and Planetary Physics, University of Oxford, UK
2017-2019: Postdoc at GEOMAR
2019- : W1 Junior Professor in Meteorology

Recent research

Kjellsson, J., Park, W. Multi-centennial variability of AMOC variability in the FOCI-OpenIFS climate model. In review for Nat. Communications Earth & Environment

Kjellsson, J., et al. Reducing Southern Ocean surface biases in the FOCI climate model. In review for Journal of Advances in Modelling Earth Systems.

Ayres, H., Ferreira, D., Park, W, Kjellsson, J., Ödalen, M. (2024) A comparison of the atmospheric response to the Weddell Sea polynya in AGCMs of varying resolutions. Weather Clim. Dynam., 5, 805–820, doi: 10.5194/wcd-5-805-2024

Savita, A., Kjellsson, J., Pilch-Kedzierski, R. (2024) ECMWF-OpenIFS climate sensitivity to horizontal resolutions and model time step. Geoscientific Model Development. 17, 1813–1829, doi: 10.5194/gmd-2023-101

Krüger, J., Kjellsson, J., Pilch Kedzerski, R., Claus, M. (2023) Connecting North Atlantic SST variability to European heat events in recent decades. Tellus A: Dynamic Meteorology and Oceanography, 75(1), 358-374, doi: 10.16993/tellusa.3235

Latif, M., Bayr, T., Kjellsson, J., Lübbecke, J.F, Martin, T., Nnamchi, H.C., Park, W., Savita, A., Sun, J., Dommenget, D. (2023) Strengthening atmospheric circulation and trade winds slowed tropical Pacific surface warming. Nat. Communications Earth & Environment, 4, doi: 10.1038/s43247-023-00912-4

Streffing, J., …, Kjellsson, J. et al. (2022) AWI-CM3 coupled climate model: description and evaluation experiments for a prototype post-CMIP6 model. Geosci. Mod. Dev., 15, 6399-6427, doi: 10.5194/gmd-15-6399-2022

Teaching

Physics of the Earth System, Bachelor

Introduction to Meteorology
Practical Meteorology + Excursion

Climate Physics Programme, Master

Oceanography-Meteorology Literature Seminar
Data Analysis & Statistics
Climate Modelling
Tropospheric Dynamics and Physics
Meteorology Lunch Seminar

Projects

ROADMAP (The Role of Ocean Dynamics and Ocean-Atmosphere Interactions in Driving Climate Variations).
JPI Oceans & Climate (via BMBF). WP4 co-lead. GEOMAR share: € 360,648. roadmap.rd.ciencias.ulisboa.pt
www.geomar.de/en/fb1-me/translate-to-english-modellierung/foci/foci-projectlist

SCENIC (Storyline Scenarios of Extreme Weather, Climate, and Environmental Events along with their Impacts in a Warmer World).
Helmholtz PoF IV Innovation Pool. earthenvironment. helmholtz.de/changing-earth/innopool-projects/

SO-CHIC (Southern Ocean Carbon and Heat Impact on Climate)
EU Horizon 2020. GEOMAR share: €356,250. www. sochic-h2020.eu/
www.geomar.de/en/fb1-me/translate-to-english-modellierung/foci/foci-projectlist

Postdocs

Abhishek Savita, 2021 - (2024), Oceanic influence on atmospheric circulation

Sayantani Ojha, 2022 - (2025), Impact of Greenland melting on atmospheric extremes

Malin Ödalen, 2023 - (2024), Southern Ocean heat and carbon uptake

Julian Krüger, 2024 - 2024, Representation of European heat waves in climate models

PhD students

Julian Krüger, 2020 - 2023, On the Role of North Atlantic Sea Surface Temperatures for European Heat Events

Sedat Gözlet, 2021 - (2024), Atmospheric Extreme Events in Future Climates

Médéric StPierre, 2021 - (2024), Climate-projection uncertainties in grand model ensemble [co-supervisor]

Yingxue Liu, 2022 - (2026), Extreme weather events in present and future climates

Qi Zhang, 2022 - (2026), Analyzing extreme temperature under global warming: Trends, Models, and Mechanisms

Master theses

Tim Sieker, 2024, Evaluating the mean climate in eddy-parameterized and eddy-rich
versions of the FOCI-OpenIFS coupled climate model

Nils Niebaum, 2024, Constraining Rain Evaporation during the EUREC4A Campaign with the Super-Droplet Model CLEO [co-supervisor]

Catharina Ziska, 2024, TBD [co-supervisor]

Tabea Rahm, 2023, How will the dominant weather regimes change under the influence of climate warming? oceanrep.geomar.de/id/eprint/58633

Lukas Schreiber, 2023, What Drives the Salinity in the Global Ocean under Changing Climate Forcing? oceanrep.geomar.de/id/eprint/58629 [co-supervisor]

Sebastian Bubmann, 2023, Is statistical downscaling of seasonal precipitation forecasts worth the effort?

Nicolas Dettling, 2021, Response of atmospheric heat and moisture transports to anthropogenic climate forcing, oceanrep.geomar.de/id/eprint/54674

Bachelor theses

Annabelle d’Heureuse, Southern Hemispheric Sudden Stratospheric Warmings in an Ensemble of the FOCI Coupled Climate Model [co-supervisor]

Edgar Borkowski, 2024, Atmosphere-model-driven uncertainty in North Atlantic climate response to CO2 forcing [co-supervisor]

Sarah Thomae, 2024, Local weather variability in Longyearbyen and surroundings, Svalbard, oceanrep.geomar.de/id/eprint/60442/ [co-supervisor]

Finn Könecke, 2024, What is the fingerprint of AMOC variability and its trends?, oceanrep.geomar.de/id/eprint/60220

Stefanie Brechtelsbauer, 2023, Extreme Greenland Ice Sheet melt events in a warmer world: A storyline approach, [co-supervisor]

Katharina Schmitt, 2023, Convective and Gravity Wave Momentum Transport during EUREC4A, oceanrep.geomar.de/id/eprint/58491 [co-supervisor]

Thies Johnsen, 2023, Impact of Ocean Model Resolution on the Representation of North Atlantic and European Blocking in the FOCI-OpenIFS Model, oceanrep.geomar.de/id/eprint/59267, [co-supervisor]

Lasse Kummer, 2023, Representation of double-gyre circulations in ocean models of varying horizontal resolutions, oceanrep.geomar.de/id/eprint/58944

Paula Damke, 2022, Effect of Seasonal Sea Ice on Southern Ocean Mesoscale Eddy Activity in a Climate Model, oceanrep.geomar.de/id/eprint/57354, [co-supervisor]

Julia Noack, 2022, How do mesoscale ocean dynamics affect Antarctic Circumpolar Current strength in climate models?, oceanrep.geomar.de/id/eprint/56735, [co-supervisor]

Nana Hocke, 2022, Representation of jet stream trends in atmospheric models, oceanrep.geomar.de/id/eprint/57353

Leah Kanzler, 2022, How do atmosphere models reproduce observed extreme precipitation events?, oceanrep.geomar.de/id/eprint/56734

Daniel Kaufmann, 2022, Veränderung des Schneefalls über Europa in Klimamodellsimulationen, oceanrep.geomar.de/id/eprint/57352

Sebastian Bubmann, 2021, Rainfall patterns in Port Moresby, Papua New Guinea,
https://oceanrep.geomar.de/id/eprint/52046

Alexander Schmitz, 2021, Veränderung der Niederschlagsverteilung über Europa in CMIP6 Modellen [co-supervisor]

Corinna Buder, 2020, Impact of a Northern European Enclosure Dam on North Atlantic Climate, oceanrep.geomar.de/id/eprint/51118

Johanna Knauf, 2020, Impact of ocean resolution on storms in the North Atlantic region, oceanrep.geomar.de/id/eprint/51117

Nils Niebaum, 2020, Trends in heat Stress over Europe, oceanrep.geomar.de/id/eprint/51346

Lisa Kaspar, 2020, Einfluss von ENSO auf die Variabilität im Südlichen Ozean, oceanrep.geomar.de/id/eprint/54682 [co-supervisor]

Jakob Deutloff, 2020, Drivers of Climate-Model Biases in Antarctic Circumpolar Current Strength, oceanrep.geomar.de/id/eprint/51119

Berenike Rappat, 2019, Klimatvariabilität im Südlichen Ozean aus Beobachtungen,