Jaison Thomas Ambadan graduates from IMPRS-ESM in Hamburg as 100th PhD candidate

Jaison Thomas Ambadan is the 100th graduate of the International Max Planck Research School on Earth System Modelling (IMPRS-ESM) at Max Planck Institute for Meteorology (MPI-M) in Hamburg. He successfully defended his doctoral thesis “Evaluation of Stochastic Kinetic Energy Backscatter in the GME Ensemble Prediction System” on 19 November 2012.

In his thesis he studies model errors in weather forecast models. D
ue to theoretical and computational limitations, model error estimation remains an unchallenged issue in operational ensemble forecasting and data assimilation. Jaison T. Ambadan´s study addresses the importance of estimating the model uncertainties associated with kinetic energy dissipations in a Numerical Weather Prediction model and incorporating the same in an ensemble data assimilation system. Ambadan showed that the stochastic kinetic energy backscatter scheme is effective in representing the kinetic energy dissipations and flow-dependent uncertainty in the global weather forecast model GME of Deutscher Wetterdienst (DWD), and incorporating the same in the model has significant positive impact on short-to-medium range forecast.

Jaison Thomas Ambadan (born 1980) grew up in India and studied
physics, applied mathematics and statistics. In 2003 he got a Master degree in Physics from the Cochin University of Science & Technology, India, presenting a study on “Simulation of the optical construction and reconstruction of computer-generated hologram”. Thereafter he changed his scientific direction toward environmental sciences. In 2008 Jaison T. Ambadan added a Master degree in Natural Resources and Environmental Science from the University of Northern British Columbia, Canada, to his portfolio. His thesis entitled “Sigma-point Kalman Filter data assimilation methods for strongly nonlinear dynamical models” qualified him to join the research project “Ensemble Kalman filter methods for quantitative precipitation forecasts” at MPI-M. He enrolled at Hamburg University in 2008 and joined the IMPRS-ESM. Within this project he worked on his thesis in close cooperation with the German weather forecast service ‘Deutscher Wetterdienst’ (DWD). Jaison T. Ambadan was offered a job at DWD as a scientist and he began working in DWD headquarters in Offenbach in early 2012, thus long before completing his doctoral research at IMPRS-ESM. Prof. Dr. Bjorn Stevens (Director of the department “The Atmosphere in the Earth System“ and Managing Director of MPI-M), Dr. Luis Kornblueh (MPI-M) and Dr. Andreas Rhodin (DWD) supervised the PhD project.

Informationen zur IMPRS-ESM:


Jaison Thomas Ambadan
Deutscher Wetterdienst
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