Univ.-Prof. Dr. Holger Tost



Institute for Atmospheric Physics
Johannes Gutenberg University Mainz
J.-J.-Becherweg 21
55128 Mainz

Room: 04-163 (former: 422)

Phone: +49- 6131-39 24294
E-Mail: tost@uni-mainz.de




Further Information
Research Interests

Atmospheric multiphase chemistry

A central focus of my research is to which degree clouds affect the chemical composition of the atmosphere, but also how atmospheric chemistry alters clouds and their properties, including atmospheric aerosol particles.
Both the partitioning between the gas phase and the atmospheric aerosol has a crucial role in these processes, but also their activation into cloud droplets.
Additionally, in the liquid phase of aerosol particles, and cloud and precipitation droplets irreversible chemical reactions take place, which modify the chemical composition of the solution, but also impact the gas phase.In case of droplet evaporation, new andmodified aerosol particles are formed, but also a partial evaporation of compounds into the gas phase takes place.

Atmospheric convection and its parameterisation
in large scale models

This research topic deals with the parameterised representations of subgrid scale clouds (mostly convective clouds) in large-scale models and their associated processes. A focus is on convective transport in and around those clouds investigating the effect of convection on atmospheric chemistry. Additionally, I am interested in convective cloud dynamics and its impact on predictability (in the framework of the CRC WavesToWeather) and on convective organisation using machine learning techniques (in the project BINARY - Big Data in Atmospheric Physics).

Earth System Modelling

The global interactions and feedbacks of atmospheric chemistry and the climate of the Earth system can only be described and analysed with the help of comprehensive Earth
System Models.
For that purpose I develop and apply the global chemistry climate model EMAC .