Nadine Wieters

Name:              Nadine Wieters
Institute:           Institute of Environmental Physics, University of Bremen
Department:      Remote Sensing
Phone:              +49-421-218 62174
Web link: 

PhD-project title: Investigating the impact of extraterrestrial energetic particles on NOx and ozone in the middle and upper atmosphere on the basis of three dimensional model studies

The main topic of this PhD project is to investigate the impact of extraterrestrial energetic particles e.g. from solar or geomagnetic storms on NOx and ozone in the stratosphere and mesopsphere on the basis of three-dimensional model studies.
During particle events the upper and middle atmosphere will be ionized. This ionization will start fast ion chemistry reactions which lead to an increase of odd hydrogen and nitrogen constituents and therefore to a decrease of ozone concentration.
To simulate these particle events, a three-dimensional stratospheric model of photochemistry and transport will be extended up to the mesopause. Parameterized ionization rates and a parameterization of the ion chemistry derived from the off-line ion chemistry modulel UBIC will be implemented, and model runs for different particle events will be carried out. The results from these model studies will then be compared to satellite and ground-based measurements, and the long-term impact of these events studied using three-dimensional model runs extending weeks or months after the particle events.
Start of doctoral thesis: 01.05.2008 | Defence: 17.06.2013

PhD committee:

Supervisor:                 Prof. Dr. Justus Notholt (Uni-HB/IUP)
Co-supervisor:            Dr. Miriam Sinnhuber (Uni-HB/IUP)
Further members:       Dr. Christian v. Savigny (Uni-HB/IUP)
                                   Dr. Ralph Lehmann (AWI Potsdam)


Wissing, J. M., M.-B. Kallenrode, N. Wieters, H. Winkler, and M. Sinnhuber: Atmospheric Ionization Module Osnabrück (AIMOS): 2. Total particle inventory in the October-November 2003 event and ozone, J. Geophys. Res., 115, A02308, doi:10.1029/2009JA014419, 2010.


Nadine Wieters:  "Investigating the impact of solar proton events on the middle atmosphere on the basis of three dimensional model studies", DPG Frühjahrstagung, Hamburg, 2-6 March, 2009.

Andreas Hilboll, Nadine Wieters, A. Richter, B.M. Sinnhuber, and J.P. Burrows, The impact of the stratospheric correction on tropospheric NO2 measurements from satellites, EGU General Assembly, 19 - 24 April 2009. (PDF)

Nadine Wieters: "Modeled impact of atmospheric ionisation by solar protons and magnetospheric electrons on upper stratospheric constituents compared with MIPAS measurements", 2nd International High Energy Particle Precipitation in the Atmosphere (HEPPA) Workshop,  National Center for Atmospheric Research, Boulder, Colorado, USA, 6-8 October 2009.