My professional interests include…

Atmospheric Physics Spatiotemporal Data Statistical Data Analysis Large-Eddy Simulation Turbulence Urban Meteorology & Climate Surface-Atmosphere Interactions Urban Surface Modelling Cloud-Climate Interactions Remote sensing Signal Processing Machine Learning Time Series Analysis & Modelling Statistical Inverse Methods Lidars Radars Satellite Observations

Experience

  1. Research Associate

    Bern University of Applied Sciences (BFH)
    Research Associate in the AI and Renewable Energy research group of the Institute for Data Applications and Security. Studying trends, spatio-temporal variability, and uncertainties related to cloud cover using remote sensing and data-driven methods.

  2. Postdoctoral Researcher

    Delft University of Technology (TU Delft)
    Postdoctoral researcher at the Department of Geoscience and Remote Sensing, Faculty of Civil Engineering and Geosciences.

  3. Doctoral Researcher

    University of Helsinki

  4. Research Assistant

    University of Helsinki

Education

  1. PhD in Physics

    University of Helsinki
    Completed a project on modelling and measuring transport processes within the urban surface layer at high spatio-temporal resolutions. The work was conducted within the urban meteorology research group of the Institute for Atmospheric and Earth System Research (INAR).
    Download dissertation

  2. MSc in Meteorology

    University of Helsinki

  3. BSc in Meteorology

    University of Helsinki
Skills & Knowledge
Programming & Tools
Python
NumPy, SciPy, pandas, xarray, dask, scikit-learn, rasterio, GDAL, etc.
netCDF4, HDF5, zarr, GRIB, gpkg, Shapefile, COG, GeoTIFF, GeoParquet etc.
Fortran (1995, 2003+), MPI, OpenMP, OpenACC
Parallel & high-performance programming
Compute- & memory-bound computational problems
Shell scripting
HPC environments (SLURM, etc.)
Linux systems
Git, CI/CD
Communication
Funding Applications
Academic Writing
Conference Presentations
Data Visualisation
Teaching & Supervision
Languages
Finnish Native
English Advanced (C1)
German Basic (A2)
Swedish Basic (A2)
Full Publication List
Sasu Karttunen, Matthias Sühring, Ewan O'Connor, Leena Järvi (2025). PALM-SLUrb v24.04: a single-layer urban canopy model for the PALM model system – model description and first evaluation. Geoscientific Model Development, 18, 5725–5757, 2025.
PDF DOI
Sasu Karttunen (2025). Modelling and measuring transport processes within urban surface layer at high spatio-temporal resolutions. Report Series in Aerosol Science, 289, 2025.
PDF ISBN
Yaxing Du, Christina Isaxon, Pontus Roldin, Kristoffer Mattisson, Sasu Karttunen, Xiaoyu Li, Ebba Malmqvist, Leena Järvi (2024). Large-eddy simulation of aerosol concentrations in a realistic urban environment: Model validation and transport mechanism. Environmental Pollution, 358, 124475, 2024.
PDF DOI
Leena Järvi, Mona Kurppa, Heino Kuuluvainen, Topi Rönkkö, Sasu Karttunen, Anna Balling, Hilkka Timonen, Jarkko V. Niemi, Liisa Pirjola (2023). Large-eddy simulation of the optimal street-tree layout for pedestrian-level aerosol particle concentrations – A case study from a city-boulevard. Science of The Total Environment, 856, 158974, 2023.
PDF DOI
Sasu Karttunen, Ewan O'Connor, Olli Peltola, Leena Järvi (2022). Quantifying the coastal urban surface layer structure using distributed temperature sensing in Helsinki, Finland. Atmospheric Measurement Techniques, 15, 2417–2432, 2022.
PDF DOI
Mona Kurppa, Pontus Roldin, Jani Strömberg, Anna Balling, Sasu Karttunen, Heino Kuuluvainen, Jarkko V. Niemi, Liisa Pirjola, Topi Rönkkö, Hilkka Timonen, Antti Hellsten, Leena Järvi (2020). Sensitivity of spatial aerosol particle distributions to the boundary conditions in the PALM model system 6.0. Geoscientific Model Development, 13, 5663–5685, 2020.
PDF DOI
Sasu Karttunen, Mona Kurppa, Mikko Auvinen, Antti Hellsten, Leena Järvi (2020). Large-eddy simulation of the optimal street-tree layout for pedestrian-level aerosol particle concentrations – A case study from a city-boulevard. Atmospheric Environment: X, 6, 100073, 2020.
PDF DOI