Research interests

• Particle filter methods for high-dimensional spaces (e.g. for application in Numerical Weather Prediction)
• In particular the application of localized particle filters in data assimilation with respect to the global ICON model as well as the regional ICON-LAM model
• Ensemble filter data assimilation methods applied to different dynamical systems, e.g. Lorenz 1963 or Lorenz 1996
• Stability of Bayesian data assimilation methods

Publications

Submitted papers

• A. Rojahn, N. Schenk, P.-J. van Leeuwen, R. Potthast, Particle Filtering and Gaussian Mixtures - On a Localized Mixture Coefficients Particle Filter (LMCPF) for global NWP

Publications in peer-reviewed journals

• N. Schenk, R. Potthast, A. Rojahn, On Two Localized Particle Filter Methods for Lorenz 1963 and 1996 Models, Front. Appl. Math. Stat. 8:920186. doi: 10.3389/fams.2022.920186

Talks

• The Localized Mixture Coefficients Particle Filter Method for Regional Data Assimilation at DWD, International Symposium on Data Assimilation, Colorado State University in Fort Collins (CO), June 2022
• A 4D-Localized Particle Filter Method for Regional Data Assimilation at DWD, EGU General Assembly 2022, virtual, May 2022
• A 4D-Localized Particle Filter Method for Regional Data Assimilation at DWD, Dynamical Systems Applied to Biology and Natural Sciences (DSABNS) 2022, virtual, Februar 2022
• Introduction to Particle Filter Methods and the Application in Numerical Weather Prediction, AG Mesoskalige Meteorologie und Klima - Institut für Atmosphäre und Umwelt, Goethe-University Frankfurt am Main, November 2021
• 4D-Localized Particle Filter Method in KENDA for ICON-LAM, WCRP-WWRP Symposium on Data Assimilation and Reanalysis, virtual, September 2021
• Analysis of the Localized Mixture Coefficients Particle Filter (LMCPF) using the Lorenz Systems as an Example, FE1-Forum DWD, virtual, May 2021

Activities

• Organizing Committee of International Symposium on Data Assimilation - Online

Awards and Fellowships

• Award for the best master's degree sponsored by Alte Leipziger Lebensversicherung a.G. (2020)
• DAAD-PROMOS-Scholarship for a semester abroad at the University of Toronto, Kanada (2018)
• Deutschlandstipendium (Germany scholarship) at Goethe-University Frankfurt am Main (October 2015 - September 2017)