Johannes Hörner

Department of Meteorology and Geophysics, Universtity of Vienna.


I am a PhD student and pre-doc university assistant in the Climate Dynamics and Modeling group of Aiko Voigt at the University of Vienna. In my research I use climate models to investigate the climate dynamics of a Snowball Earth: a seperate state of the climate system in which the world is completely or almost completely covered in ice.

I am also interested in interactive media, programming and storytelling.


Oct 4, 2023 preprint open for public discussion for ESD: Sea-ice thermodynamics can determine waterbelt scenarios for Snowball Earth
Sep 1, 2023 I am on a research stay at Peking University as part of the planetary atmospheres group until end of October
Apr 24, 2023 poster at the EGU General Assembly
Sep 23, 2022 participation in the Earth System Modeling school at the Max-Planck-Institute for Meteorology in Hamburg
Jun 29, 2022 participation in the NextGEMS Cycle 2 Hackathon


  1. GMD
    How does cloud-radiative heating over the North Atlantic change with grid spacing, convective parameterization, and microphysics scheme in ICON version 2.1.00?
    Sylvia Sullivan, Behrooz Keshtgar, Nicole Albern, Elzina Bala, Christoph Braun, Anubhav Choudhary, Johannes Hörner, Hilke Lentink, Georgios Papavasileiou, and Aiko Voigt
    Geoscientific Model Development, 2023
  2. NatGeo
    Ice-free tropical waterbelt for Snowball Earth events questioned by uncertain clouds
    Christoph Braun, Johannes Hörner, Aiko Voigt, and Joaquim G. Pinto
    Nature Geoscience, 2022
  3. JAMES
    Snowball Earth initiation and the thermodynamics of sea ice
    Johannes Hörner, Aiko Voigt, and Christoph Braun
    Journal of Advances in Modeling Earth Systems, 2022
  4. ACP
    An idealized model sensitivity study on Dead Sea desertification with a focus on the impact on convection
    Samiro Khodayar, and Johannes Hoerner
    Atmospheric Chemistry and Physics, 2020