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Muller Group

Atmosphere and Ocean Dynamics

The research activities of the Muller group lie in the fields of geophysical fluid dynamics and climate science. The team is particularly interested in processes, which are too small in space and time to be explicitly resolved in coarse-resolution Global Climate Models (GCMs) used for climate prediction. Important examples are internal waves in the ocean, and clouds in the atmosphere. These small-scale processes need to be parametrized, that is, modeled with simple equations, in GCMs in order to improve current model projections of climate change. The group’s overall goal is to improve our fundamental understanding of these small-scale processes of our climate, using theoretical and numerical tools, as well as in-situ and satellite measurements.

Key questions addressed are:

– What is the response of the hydrological cycle to global warming? Numerous studies, using both regional high-resolution models and global coarse-resolution models, predict an increase of the intensity of precipitation extremes with warming. Understanding this amplification of precipitation extremes with climate change is a crucial question, with important socio-economic consequences.

– What are the physical processes responsible for the organization of tropical clouds? There are different types of organized convection, that is, the overturning of air within which clouds are embedded. Arguably, the most spectacular example is the tropical cyclone, with its eye devoid of deep convection, surrounded by a cloudy eyewall where extreme winds are found. In fact, organized convection is ubiquitous in the tropics. But it is still poorly understood, despite strong societal and climatic impacts.

– What is the contribution of internal waves to ocean mixing, and what impact do they have on the ocean large-scale circulation? Internal waves are ubiquitous in the ocean, and contribute significantly to the ocean global energetics. One of the goals of the Muller group is to clarify the physical mechanisms leading to the instability, overturning and breaking of those waves, as well as to quantify the mixing induced by wave breaking events.


Image of Lokahith Agasthya

Lokahith Agasthya


Image of Jiawei Bao

Jiawei Bao


Image of Alejandro Casallas Garcia

Alejandro Casallas Garcia


Image of Giousef Charinti

Giousef Charinti

PhD Student

Image of Mathis Cheve

Mathis Cheve

External student

Image of Sima Dogan

Sima Dogan

PhD Student

Image of Yi-Ling Hwong

Yi-Ling Hwong


Image of Andrea Polesello

Andrea Polesello

PhD Student

Image of Andrea Stöllner

Andrea Stöllner

PhD Student

Image of Bowen Yang

Bowen Yang

PhD Student

Current Projects

New theoretical perspectives on self-aggregation of clouds | Tropical energetics in a warming climate | Tropical cyclone formation and intensification | Ocean-atmosphere interactions


Agasthya LN, Muller CJ. 2024. Dynamics and scaling of internally cooled convection. Communications in Nonlinear Science and Numerical Simulation. 134, 108011. View

Hwong Y-L, Muller CJ. 2024. The unreasonable efficiency of total rain evaporation removal in triggering convective self‐aggregation. Geophysical Research Letters. 51(6), e2023GL106523. View

GOSWAMI BB. 2024. A pre-monsoon signal of false alarms of Indian monsoon droughts. Geophysical Research Letters. 51(5), e2023GL106569. View

Bao J, Stevens B, Kluft L, Muller CJ. 2024. Intensification of daily tropical precipitation extremes from more organized convection. Science Advances. 10(8), eadj6801. View

Schmidt H, Rast S, Bao J, Cassim A, Fang SW, Jimenez-De La Cuesta D, Keil P, Kluft L, Kroll C, Lang T, Niemeier U, Schneidereit A, Williams AIL, Stevens B. 2024. Effects of vertical grid spacing on the climate simulated in the ICON-Sapphire global storm-resolving model. Geoscientific Model Development. 17(4), 1563–1584. View

View All Publications

ReX-Link: Caroline Muller


Since 2021 Assistant Professor, Institute of Science and Technology Austria (ISTA)
2015 – 2021 CNRS researcher & Lecturer at Ecole Normale Superieure, Paris, France
2012 – 2015 CNRS researcher, Ecole Polytechnique, Paris, France
2010 – 2012 Research Scholar, Princeton University/GFDL, Princeton, USA
2008 – 2010 Postdoc, Massachusetts Institute of Technology, Cambridge, USA
2008 PhD, New York University, Courant Institute of Mathematical Sciences, New York, USA

Selected Distinctions

2019-2024 ERC Starting Grant
2019 Invited professor – New York University – Abu Dhabi campus
2012-2017 Director of summer school organized by Ecole Polytechnique & the University of Cambridge –
2016 Invited professor – New York University – Shanghai campus
2015 Joint appointment as lecturer at Ecole Normale Superieure, Paris
2009 Publication selected to be an Editor’s Highlight, Geophysical Research Letter
2007 Sandra Bleistein Prize, Courant Institute of Mathematical Sciences
2007 Nominated for Outstanding Teaching Award, New York University
2007 Best poster presentation award, AMS Conference on Atmospheric and Oceanic Fluid Dynamics
2003-2008 Henry MacCracken Fellowship, New York University

Additional Information

View Muller group website

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