fischer fischer

M. Sc. Matthias Fischer

  • Postanschrift:
    Karlsruher Institut für Technologie
    Institut für Technische Mechanik
    Teilinstitut Dynamik/Mechatronik
    Postfach 6980
    76049 Karlsruhe

    Haus- und Lieferanschrift:
    KIT-Campus Süd
    Institut für Technische Mechanik
    Teilinstitut Dynamik/Mechatronik
    Geb. 10.23, 2.OG
    Kaiserstraße 10
    76131 Karlsruhe

Surrogate models for uncertainty quantification for the forecast of the West African Monsoon

hourly_rainfall_africa
Hourly rainfall [in mm] as a result of model simulation runs

Surrogate modeling is a method that can be applied if quantities of interest cannot be easily directly measured or simulated, e.g. if a simulation run or experiment is very expensive. In this case, a surrogate model for the outcome is obtained and used instead. Due to increasing complexity of models, surrogate modeling is playing an increasing role in various engineering, but also other scientific disciplines. In this work, a meteorological problem is analyzed in collaboration with the Institute of Meteorology and Climate Research - Department Troposphere Research at KIT.


The West African monsoon is a major wind system that affects regions between latitudes 9° and 20° N. The monsoon is the result of the seasonal shifts of the ITCZ (Intertropical Convergence Zone) and seasonal temperature and humidity differences between the Sahara and the equatorial Atlantic Ocean. The forecast of this monsoon has shown to suffer from remarkable uncertainties in several quantities. Some of these quantities are the local rainfall and the north-south shift which have a great impact on the inhabitants, particularly on the agriculture. In order to quantify the uncertainty in the forecast of the West African monsoon, a sensitivity analysis for a range of uncertain parameters in the weather model is conducted.


For this study the ICON model which is operationally used by the Deutscher Wetterdienst (DWD) is applied to carry out weather simulations. Since for the analysis a steady state for the monsoon quantities over simulated days is intended, the simulated time and thus the computational cost for one simulation run is very high. Therefore, surrogate models seem to be a promising opportunity. In this work, Gaussian Process Surrogates are used to achieve a relation between input parameters and monsoon quantities. The surrogate model is then used to carry out a global sensitivity analysis given defined ranges and probability density functions for all parameters. The results can offer an indication which parameter definitions should be specified more detailed by conducting further studies in order to reduce the uncertainty in forecasted monsoon quantities. Furthermore, the surrogate model can serve as a basis for parameter identification studies.

Contact: Prof. C. Proppe, M. Fischer

Publications


Quantifying uncertainty in simulations of the West African monsoon with the use of surrogate models
Fischer, M.; Knippertz, P.; Linden, R. van der; Lemburg, A.; Pante, G.; Proppe, C.; Marsham, J. H.
2024. Weather and Climate Dynamics, 5 (2), 511–536. doi:10.5194/wcd-5-511-2024
Enhanced Universal Kriging for Transformed Input Parameter Spaces
Fischer, M.; Proppe, C.
2023. 5th ECCOMAS Thematic Conference on Uncertainty Quantification in Computational Sciences and Engineering, UNCECOMP 2023, Ed.: M. Papadrakakis, National Technical University of Athens (NTUA)
Enhanced universal kriging for transformed input parameter spaces
Fischer, M.; Proppe, C.
2023. Probabilistic Engineering Mechanics, 74, Art.-Nr.: 103486. doi:10.1016/j.probengmech.2023.103486
Using surrogate models to quantify uncertainty in simulations of the West African Monsoon
Fischer, M.; Knippertz, P.; Linden, R. van der; Lemburg, A.; Pante, G.; Proppe, C.
2022. European Geosciences Union General Assembly (EGU 2022), Online, 23.–27. Mai 2022
Using surrogate models to quantify uncertainty in simulations of the West African Monsoon
Fischer, M.; Knippertz, P.; Linden, R. van der; Lemburg, A.; Pante, G.; Proppe, C.
2022. Copernicus. doi:10.5194/egusphere-egu22-7470
A sequential multi-point sampling procedure for surrogate models
Fischer, M.; Proppe, C.
2021. UNCECOMP 2021: 4th ECCOMAS Thematic Conference on Uncertainty Quantification in Computational Sciences and Engineering. Ed.: M. Papadrakakis, 246–257, National Technical University of Athens (NTUA). doi:10.7712/120221.8036.18925

Betreute Lehrveranstaltungen

WS 23/24
SS 23
WS 22/23
SS 22
WS 21/22
SS 2021
WS 19/20
SS 2020
WS 19/20