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LEONHARD SCHECK

 

Research

Assimilation of visible and near-infrared satellite images

High-resolution observations from instruments on geostationary satellites provide a wealth of information about convective activity and are therefore seen as a important type of observation for convective scale data assimilation (DA). In particular the visible and near-infrared channels provide information on the cloud distribution, cloud microphysical properties and cloud structure with high temporal and spatial resolution. However, in operational DA systems currently only clear sky thermal infrared and microwave radiance observations are used, which mainly provide temperature and humidity information. Sufficiently fast and accurate forward operators for visible and near-infrared radiances are not yet available, because multiple scattering makes radiative transfer at solar wavelengths complicated and computationally expensive.

Only recently a we developed MFASIS, a loop-up table based 1D radiative transfer method that is orders of magnitude faster than conventional radiative transfer solvers for the visible spectrum and similarly accurate. A preliminary version of a forward operator based on this method, which simulates synthetic MSG-SEVIRI images from COSMO-DE model output, has been completed and implemented in the pre-operational km-scale Ensemble Data Assimilation (KENDA) system of DWD. To improve the consistency and accuracy of the operator we included computationally cheap methods to account for the overlap of subgrid clouds and the most important 3D radiative transfer effects.

MFASIS has also been used to evaluate large domain large eddy simulations carried out using the ICON model in the framework of the HD(CP)2 project. Synthetic 0.6 and 0.8 micron MODIS images with 250m resolution were computed from 3D model states with a grid resolution of about 150m. The high resolution allowed us to determine the effective grid resolution from cloud size distributions.

Former research topics

Tropical cyclones, singular Vectors, adaptive grid refinement in the framework of the METSTRÖM project, high performance computing, visualization and computational steering at LRZ, core collapse supernovae and extragalactic jets at the MPI for Astrophysics.

Resources

Fornado

Fornado = a FORtran Neural network inference code including an ADjOint version. Fornado can be used as a replacement for Tensorflows predict subroutine and is optimized for small networks (less than 100 nodes per layer).

CosmoState

CosmoState is a grib_api-based Python module to read GRIB1 and GRIB2 files generated by COSMO (and possibly other NWP models).

Simple numerical schemes for PDEs

Interactive IPython notebook illustrating the properties of simple numerical schemes for the linear advection equation and the non-linear Burgers equation (there is also a non-interactive HTML version).

CV

Publications

Peer-reviewed

  1. A neural network based forward operator for visible satellite images and its adjoint
    Author: Leonhard Scheck. Submitted to JQSRT, 2021.
  2. Local Impact of Stochastic Shallow Convection on Clouds and Precipitation in the Tropical Atlantic
    Authors: Sakradzija, Mirjana; Senf, Fabian; Scheck, Leonhard; ... Klocke, Daniel; see more
    Published:Dec 2020 in Monthly Weather Review
    DOI: 10.1175/MWR-D-20-0107.1
  3. Assimilating Visible and Infrared Radiances in Idealized Simulations of Deep Convection
    Authors: Schrottle, Josef; Weissmann, Martin; Scheck, Leonhard; Hutt, Axel
    Published:Nov 2020 in Monthly Weather Review
    DOI: 10.1175/MWR-D-20-0002.1
  4. Assimilating visible satellite images for convective-scale numerical weather prediction: A case-study
    Authors: Scheck, Leonhard; Weissmann, Martin; Bach, Liselotte
    Published:Jul 2020 in Quarterly Journal of the Royal Meteorological Society
    DOI: 10.1002/QJ.3840
  5. The Added Value of Large-eddy and Storm-resolving Models for Simulating Clouds and Precipitation
    Authors: Stevens, Bjorn; Acquistapace, Claudia; Hansen, Akio; ... Zaengl, Gunter; see more
    Published: 2020 in Journal of the Meteorological Society of Japan
    DOI: 10.2151/JMSJ.2020-021
  6. Efficient methods to account for cloud top inclination and cloud overlap in synthetic visible satellite images,
    Leonhard Scheck, Martin Weissmann, Bernhard Mayer,
    JTECH, submitted.
  7. Metrics for the evaluation of warm convective cloud fields in a large eddy simulation with Meteosat images,
    S. Bley, H. Deneke, F. Senf, and L. Scheck,
    QJRMS, accepted.
  8. A fast radiative transfer method for the simulation of visible satellite imagery,
    Leonhard Scheck, Pascal Fr\`erebeau, Robert Buras-Schnell, Bernhard Mayer,
    Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 175, p.54–67, may 2016.
    [ link ]
  9. Goal-oriented adaptivity for idealised tropical cyclones: A binary interaction scenario,
    Martin Baumann, Vincent Heuveline, Leonhard Scheck, Sarah C. Jones,
    Meteorologische Zeitschrift, Vol. 24, No. 3, p.269–292 2015.
  10. Simulation of tropical-cyclone-like vortices in shallow-water ICON-hex using goal-oriented r-adaptivity,
    Werner Bauer, Martin Baumann, Leonhard Scheck, Almut Gassmann, Vincent Heuveline, Sarah C. Jones,
    Theoretical and Computational Fluid Dynamics, Vol. 28, No. 1, p.107–128 2014.
  11. Singular Vectors for Barotropic, Hurricane-Like Vortices in Horizontal Shear: Structure and Perturbation Growth Mechanisms,
    Leonhard Scheck, Sarah C. Jones, Vincent Heuveline,
    Journal of the Atmospheric Sciences, Vol. 71, No. 3, p.1002–1020 2014.
  12. Mesoscale cyclogenesis over the western north Pacific Ocean during TPARC,
    Christopher A. Davis, Sarah C. Jones, Doris Anwender, Janina Badey, Leonhard Scheck,
    Tellus Series a-Dynamic Meteorology and Oceanography, Vol. 65 2013.
  13. The Resonant Interaction of a Tropical Cyclone and a Tropopause Front in a Barotropic Model. Part I: Zonally Oriented Front,
    Leonhard Scheck, Sarah C. Jones, Martin Juckes,
    Journal of the Atmospheric Sciences, Vol. 68, No. 3, p.405–419 2011.
  14. The Resonant Interaction of a Tropical Cyclone and a Tropopause Front in a Barotropic Model. Part II: Frontal Waves,
    Leonhard Scheck, Sarah C. Jones, Martin Juckes,
    Journal of the Atmospheric Sciences, Vol. 68, No. 3, p.420–429, mar 2011.
    [ link ]
  15. Interactive Indoor Thermal Comfort Evaluation,
    Treeck, Christoph van, Petra Wenisch, Michael Pfaffinger, Leonhard Scheck, Ernst Rank, S Wagner, M Steinmetz, A Bode, M Brehm,
    High Performance Computing in Science and Engineering, Garch/Munich 2007, p.421–430 2009.
  16. Multidimensional supernova simulations with approximative neutrino transport - II. Convection and the advective-acoustic cycle in the supernova core,
    L. Scheck, H. -Th. Janka, T. Foglizzo, K. Kifonidis,
    Astronomy \& Astrophysics, Vol. 477, No. 3, p.931–952 2008.
  17. Instability of a stalled accretion shock: Evidence for the advective-acoustic cycle,
    T. Foglizzo, P. Galletti, L. Scheck, H. -Th. Janka,
    Astrophysical Journal, Vol. 654, No. 2, p.1006–1021 2007.
  18. Nucleosynthesis-relevant conditions in neutrino-driven supernova outflows - I. Spherically symmetric hydrodynamic simulations,
    A. Arcones, H.-Th. Janka, L. Scheck,
    Astronomy \& Astrophysics, Vol. 467, No. 3, p.1227–1248 2007.
  19. Multidimensional supernova simulations with approximative neutrino transport - I. Neutron star kicks and the anisotropy of neutrino-driven explosions in two spatial dimensions,
    L. Scheck, K. Kifonidis, H. -Th. Janka, E. Mueller,
    Astronomy \& Astrophysics, Vol. 457, No. 3, p.963–U101 2006.
  20. Neutrino-driven convection versus advection in core-collapse supernovae,
    T. Foglizzo, L. Scheck, H. -Th. Janka,
    Astrophysical Journal, Vol. 652, No. 2, p.1436–1450 2006.
  21. Non-spherical core collapse supernovae - II. The late-time evolution of globally anisotropic neutrino-driven explosions and their implications for SN 1987 A,
    K Kifonidis, T Plewa, L Scheck, HT Janka, E Muller,
    Astronomy \& Astrophysics, Vol. 453, No. 2, p.661–U17 2006.
  22. Neutrino-driven supernovae: An accretion instability in a nuclear physics controlled environment,
    HT Janka, R Buras, FSK Joyanesa, A Marek, M Rampp, L Scheck,
    Nuclear Physics a, Vol. 758, p.19C–26C 2005.
  23. Supernova Asymmetries and pulsar kicks - Views on controversial issues,
    HT Janka, L Scheck, K Kifonidis, E Muller, T Plewa, RM Humphreys, KZ Stanek,
    in: Fate of the Most Massive Stars, Proceedings, Vol. 332, p.363–373 2005.
  24. Neutrino signatures of supernova forward and reverse shock propagation,
    R Tomas, M Kachelriess, G Raffelt, A Dighe, HT Janka, L Scheck,
    Journal of Cosmology and Astroparticle Physics, No. 9 2004.
  25. Pulsar recoil by large-scale anisotropies in supernova explosions,
    L Scheck, T Plewa, HT Janka, K Kifonidis, E Muller,
    Physical Review Letters, Vol. 92, No. 1 2004.
  26. Does the plasma composition affect the long-term evolution of relativistic jets?,
    L Scheck, MA Aloy, JM Marti, JL Gomez, E Muller,
    Monthly Notices of the Royal Astronomical Society, Vol. 331, No. 3, p.615–634 2002.

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