• The tropical troposphere and its role for global climate and climate change
• Interactions of dynamics, chemistry and radiation in the middle and upper atmosphere
• Effects of solar variability on the Earth system
• Vertical coupling processes in the atmosphere
• Implications of climate engineering schemes to limit climate change
• Adjoint modeling (data assimilation and sensitivity studies)
• Air pollution modeling

• List of publications

ongoing:

• DFG Research Unit VolImpact - VolDyn (Volcanic impacts on atmospheric dynamics); 2019 -
• DFG Research Unit VolImpact - VolARC (Constraining the effects of volcanic aerosol on radiative forcing and stratospheric composition); 2019 -
• BMBF/ROMIC2 - SOCTOC (Effects of anthropogenic stratospheric ozone changes on climate sensitivity and
  tropospheric oxidation capacity) 2019 -
• DFG Reserach Unit MS-GWAVES - GWING (Gravity Wave Interactions in the Global Atmosphere); 2015 -

past (at MPI-M):

• DFG/SPP Climate Engineering - CELARIT (Climate Engineering Liability and Reliability: An Integrated Treatment); 2016 - 2019
• DFG/SPP Climate Engineering - ComparCE (Comparative assessment of potential impacts, side-effects and uncertainties of CE measures and emission-reduction efforts); 2013 - 2019
• BMBF/MiKlip - ALARM (Alert for large volcanic eruptions in medium term climate prediction); 2011 - 2018
• DFG/SPP Climate Engineering - CEIBRAL (Climate Engineering Impacts: Between Reliability and Liability); 2013-2015.
• FP7 - EUTRACE (European Transdisciplinary Assessment of Climate Engineering); 2012 - 2015
• DFG/FG SHARP (Stratospheric Change and its role for climate prediction); 2009 - 2015
• FP7 - IMPLICC (Implications and risks of engineering solar radiation to limit climate change); 2009 - 2012
• DFG/CAWSES - ARTOS (The Atmospheric Response to Solar Variability); 2005 - 2011
• AFO2000 - MEDEC (Mesospheric Dynamics, Energetics and Chemistry); 2000 - 2004; The final report can be found here.

ongoing (PhD):

• Moritz Günther, Paul Keil

past (PhD):

• Sally Dacie:"Using simple models to understand changes in the tropical mean atmosphere under warming.", Univ. of Hamburg, 2019.
• Katharina Meraner: "Towards modeling climate effects of energetic particle precipitation", Univ. of Hamburg, 2017.
• Matthias Bittner: "On the discrepancy between observed and simulated dynamical responses of Northern Hemisphere winter climate to large tropical volcanic eruptions", Univ. of Hamburg, 2015.
• Max Popp: "Climate Instabilities under strong solar forcing" (main supervisor: J. Marotzke), Univ. of Hamburg, 2014.
• Thomas Krismer: "Wave-mean flow interactions driving the quasi-biennial oscillation in ECHAM6" (main supervisor: M. Giorgetta), Univ. of Hamburg, 2014.
• Felix Bunzel: "Numerical studies of stratosphere-troposphere dynamical coupling in a changing climate", Univ. of Hamburg, 2013.
• Stergios Misios: "Influences of the 11-year solar cycle on the tropical atmosphere and oceans", Univ. of Hamburg, 2012.
• Jens Kieser: "The influence of precipitating solar and magnetospheric energetic charged particles on the entire atmosphere - Simulations with HAMMONIA", Univ. of Hamburg, 2011.

ongoing (masters):

• Isaac Baffour

past (masters/diploma):

• Alon Azoulay: "The Arctic polar vortex response to volcanic forcing of di erent strength", Univ. of Hamburg, 2019.
• Patrick Pieper: "Investigation of spatial sensitivities in an integrated assessment of stratospheric sulfur aerosol solar radiation management respecting regional precipitation guardrails" (main supervisor: H. Held), Univ. of Hamburg, 2015.
• Rabea Athmer: "The atmospheric response to large volcanic eruptions under climate change" (main supervisor: C. Timmreck), Univ. of Hamburg, 2014.
• Marius Stankoweit: "Climate Engineering: Insights from the Model MIND" (main supervisor: H. Held), Univ. of Hamburg, 2013.
• Andreas Miller: "Middle atmosphere coupling during stratospheric warming events simulated with the HAMMONIA GCM", Univ. of Hamburg, 2011.
• Anna Possner: "The resolution dependency of simulated tracer transport into the Antarctic polar vortex in ECHAM6", Univ. of Edinburgh, 2010 (main supervisor: D. Stevenson)
• M. Keller: "Untersuchung der niederfrequenten Variabilitaet in der tropischen Mesosphaere des Chemie-Klimamodelss HAMMONIA", Univ. of Hamburg, 2008
• Florian Nau: "Planetare Wellen in der MLT im Klimamodell HAMMONIA", Univ. of Osnabrueck, 2008 (main supervisor: M.-B. Kallenrode)

• Global circulation and Climate, Univ. of Hamburg (2019/2020)
• The middle atmosphere, Univ. of Hamburg (2009-2018)

(Lecture materials are available for students of the Univ. of Hamburg via STINE.)

Birth Place

Lübeck, Germany

School

Thomas-Mann-Schule, Lübeck (high school)

College/University

University of Cologne, Germany, diploma in geophysics, 1996

Ph.D.

University of Cologne, Germany, 1999

Ph.D. thesis

Vierdimensionale Datenassimilation nach der Variationsmethode fuer ein mesoskaliges Chemietransportmodell - 4D-Var data assimilation for a mesoscale chemistry transport model

Scientist positions

Laboratoire de Meteorologie Dynamique, Paris, France, 1999-2001

National Center for Atmospheric Research, Boulder, CO, USA: Scientific Visitor, Apr  2006 - Mar 2007

Max Planck Institute for Meteorology, since 2002,

Apr 2007 - Aug 2018: Head of the "Middle and Upper Atmosphere Modelling Group"

since Aug 2018: Head of the "Global Circulations and Climate Group"

since Apr 2010: Deputy director of the department "Atmosphere in the Earth System"