I am a Dutch guy researching weather and climate simulations in Oxford, after doing my PhD in Mainz (Germany) and studying meteorology and climate processes in Utrecht and Wageningen. During my PhD I was part of the German transregional collaboration center WavesToWeather (TRR-165) and currently I am contributing to a project called Model Uncertainty Model Intercomparison Project (MUMIP). Both of these research projects proceed in active collaboration with national weather services (in the UK, Germany, France and The Netherlands) and international modelling centers.
During my master thesis I did an internship at the Dutch national weather service in De Bilt: Koninklijk Nederlands Meteorologisch Instituut, or in English: Royal Netherlands Meteorological Institute.
Extended research interests:
- Mid-latitude weather;
- (Deep) convection;
- Climate and Earth System;
- (Atmospheric) Dynamics;
- Weather and Climate Models;
- Local weather;
- Severe Weather;
- Wind Storms and dynamic weather patterns;
- Weather and Climate Observations and (Automated) Weather Stations;
Divergent convective outflow in large-eddy simulations
Upper-tropospheric divergence is found to be controlled by net latent heating and convective organization. At low precipitation rates isolated convective cells have a stronger mass divergence than squall lines. The squall line divergence is the weakest (relative to the net latent heating) when the outflow is purely 2D in the case of an infinite-length squall line. At high precipitation rates the mass divergence discrepancy between the various modes of convection reduces. Hence, overall, the magnitude of divergent outflow is explained by the latent heating and the dimensionality of the outflow, which together create a non-linear relation.
Evolution of squall line variability and error growth in an ensemble of large eddy simulations
An ensemble sensitivity analysis reveals that anomalies in squall-line-relative flow with respect to the ensemble mean are also associated with the secondary convective initiation. Downdraughts are fed with extra air by a convergence zone on the rearward flank of the updraughts. An analysis of difference growth within the ensemble shows that a substantial proportion of variability is explained by cold pool propagation contrasts during this stage (30–80 min), which is partly removed when a feature-relative perspective is taken. The patterns of coherent variability exist on the timescale of an hour and dissipate subsequently (80–100 min).