Publications

Peer reviewed publications

Leinonen, J., U. Hamann, U. Germann, & J. R. Mecikalski, 2022
Seamless lightning nowcasting with recurrent-convolutional deep learning
Artificial Intelligence for the Earth Systems https://doi.org/10.1175/AIES-D-22-0043.1
also as preprint here https://arxiv.org/abs/2203.10114

Leinonen, J., U. Hamann, U. Germann, & J. R. Mecikalski, 2022
Nowcasting thunderstorm hazards using machine learning: the impact of data sources on performance
Natural Hazards and Earth System Sciences 22.2 (2022): 577-597; https://nhess.copernicus.org/articles/22/577/2022/

Beusch, L., L. Foresti, M. Gabella, U. Hamann, 2018
Satellite-based rainfall retrieval: from generalized linear models to artificial neural networks
Remote Sens. 2018, 10(6), 939; https://doi.org/10.3390/rs10060939

Raspaud, M., D. Hoese, A. Dybbroe, P. Lahtinen, A. Devasthale, M. Itkin, U. Hamann, L. Rasmussen, E. S. Nielsen, T. Leppelt, A. Maul, C. Kliche, H. Thorsteinsson, 2018
PyTroll: An open source, community driven Python framework to process Earth Observation satellite data
BAMS, https://journals.ametsoc.org/doi/10.1175/BAMS-D-17-0277.1

Romano, S., P. Burlizzi, S. Kinne, F. De Tomasi, U. Hamann, M. R. Perrone, 2018
Radiative Impact of Etna volcanic aerosols over south eastern Italy on 3 December 2015
Atmospheric Environment, https://doi.org/10.1016/j.atmosenv.2018.03.038

Gabella, M., P. Speirs, U. Hamann, U. Germann, A. Berne, 2017
Measurement of Precipitation in the Alps Using Dual-Polarization C-Band Ground-Based Radars, the GPM Spaceborne Ku-Band Radar, and Rain Gauges
Remote Sensing. 2017; 9(11):1147.

Emde, C., R. Buras-Schnell, A. Kylling, B. Mayer, J. Gasteiger, U. Hamann, J. Kylling, B. Richter, C. Pause, T. E. Dowling, and L. Bugliaro, 2015
The libRadtran software package for radiative transfer calculations (version 2.0.1)
Geosci. Model Dev., 9, 1647-1672, 2016
doi:10.5194/gmd-9-1647-2016

Hamann, U., A. Walther, B. Baum, R. Bennartz, L. Bugliaro, M. Derrien, P. Francis, A. Heidinger, S. Joro, A. Kniffka, H. Le Gléau, M. Lockhoff, H.-J. Lutz, J. F. Meirink, P. Minnis, R. Palikonda, R. Roebeling, A. Thoss, S. Platnick, P. Watts, and G. Wind, 2014
Remote sensing of cloud top pressure/height from SEVIRI:
analysis of ten current retrieval algorithms
Atmos. Meas. Tech., 7, 2839-2867, 2014
www.atmos-meas-tech.net/7/2839/2014/
doi:10.5194/amt-7-2839-2014

Roebeling R., B. Baum, R. Bennartz, U. Hamann, A. Heidinger, J. F. Meirink, M. Stengel, A. Thoss, A. Walther, and P. Watts, 2014
Summary of the Fourth Cloud Retrieval Evaluation Workshop
Bull. Amer. Meteor. Soc., doi: 10.1175/BAMS-D-14-00184.1

Roebeling R., B. Baum, R. Bennartz, U. Hamann, A. Heidinger, A. Thoss, and A. Walther, 2013
Evaluating and Improving Cloud Parameter Retrievals
Bull. Amer. Meteor. Soc., 94, ES41-ES44.

PhD thesis

Diploma thesis

Eumetsat fellowship reports

Hamann, U., 2013
Fellowship report for the CLOUDSTATE fellowship 2013

Hamann, U., 2012
Fellowship report for the CLOUDSTATE fellowship 2012

Hamann, U., 2011
Fellowship report for the CLOUDSTATE fellowship 2011

Technical reports and documentations

Mayer, B., A. Kylling, C. Emde, R. Buras, U. Hamann, J. Gasteiger, and B. Richter, 2015
libRadtran user's guide
User manual / User guide

Emde, C., A. Kylling, R. Buras, B. Mayer, F. Schreier, and U. Hamann, 2010
Towards a generic radiative transfer model for the earth's surface-atmosphere system: ESAS-Light
Technical report, Final Report, ESTEC Contract No. AO/1-5433/07/NL/HE

Newsletters

Roebeling R., B. Baum, R. Bennartz, U. Hamann, A. Heidinger, A. Thoss, and A. Walther, 2012
Third Cloud Retrieval Evaluation Workshop (CREW-3)
GEWEX newletter 2012, February 2012

Conference contributions

Hamann, U., J. Zeder, S. Nath, L. Clementi, L. Foresti, A. Hering, J. R. Mecikalski, D. Nerini, L. Nisi, A. Rigazzi, O. Romppainen-Martius, M. Sassi, U. Germann, 2019
Synergetic use of MTG FCI and LI for thunderstorm nowcasting
Invited Presentation
EUMETSAT's MTG / EPS-SG User Days, 2019, Darmstadt, Germany

Best ECSS Poster Jury Award
Nath, S., H. Barras, L. Clementi, L. Foresti, U. Hamann, A. Hering, D. Nerini, L. Nisi, M. Sassi, J. Zeder, U. Germann 2019
Towards automated multi-sensor thunderstorm warning suggestions
contributing author (poster)
10th European Conference on Severe Storms, 2019, Krakow, Poland

Hamann, U., J. Zeder, H. Barras, L. Clementi, L. Foresti, A. Hering, S. Nath, D. Nerini, L. Nisi, M. Sassi, U. Germann, 2019
A novel multi-sensor nowcast algorithm of thunderstorm intensity using machine learning
oral
10th European Conference on Severe Storms, 2019, Krakow, Poland

Barras, H., U. Hamann L. Foresti, A. Hering, D. Nerini, J. Zeder, U. Germann, O. Martius, 2019
Improving hail nowcasting by combining crowd-sourced hail reports with machine learning
contributing author (oral)
10th European Conference on Severe Storms, 2019, Krakow, Poland

Hamann, U., J. Zeder, L. Beusch, L. Clementi, L. Foresti, A. Hering, D. Nerini, L. Nisi, M. Sassi, U. Germann, 2019
Nowcasting of thunderstorm severity with Artificial Neural Networks in the Alpine Region
oral
3rd European Nowcasting Conference, 2019, Madrid, Spain

Hamann, U., N. Besic, L. Beusch, L. Clementi, L. Foresti, M. Gabella, A. Hering, J. Zeder, D. Nerini, L. Nisi, M. Sassi, U. Germann, 2018
Strategies for probabilistic nowcasting of thunderstorm by exploiting satellite, radar, and lightning observations with Artificial Neural Networks
oral
EUMETSAT conference 2018, Tallinn, Estonia

Zeder, J., U. Hamann, D. Nerini, L. Foresti, L. Clementi, A. Hering, U. Germann, 2018
Comparison of thunderstorm characteristics as seen by SEVIRI and radar regarding lightning and hail initiation
contributing author (poster)
EUMETSAT conference 2018, Tallinn, Estonia

Tom, M., M. Sütterlin, D. Bouffard, M. Rothermel, U. Hamann, A. Duguay-Tetzlaff, S. Wunderle, E. Baltsavias, 2018
Integrated lake ice monitoring in Swiss Lakes
contributing author (poster)
EUMETSAT conference 2018, Tallinn, Estonia

Germann, U., M. Gabella, H. Barras, Y. Barton, N. Besic, M. Boscacci, L. Clementi, J. Figueras, L. Foresti, J. Grazioli, U. Hamann, A. Hering, D. Nerini, L. Nisi, L. Panziera, M. Sartori, I. Sideris, S. Trefalt, F. Van Den Heuvel, and B. Calpini, 2018
A Rendezvous of Re-search and Operations – the New Swiss Radar Generation
contributing author
ERAD 2018 (session Radar Networking), Ede-Wageningen, Netherlands

A. Hering, L. Nisi, U. Hamann, and U. Germann, 2018
The Nowcasting Potential of Lightning-jumps in Convective Cells Tracked by Radar in Complex Orography
contributing author
ERAD 2018 (session Nowcasting and Blending Techniques), Ede-Wageningen, Netherlands

Hamann, U., L. Beusch, L. Clementi, A. M. Hering, E. Leonarduzzi, D. Nerini, L. Nisi, M. Sassi, U. Germann, 2017
Integrated thunderstorm nowcast exploiting satellite, radar and high resolution NWP data
oral
Eumetsat Conference 2017, Rome, Italy

Hamann, U., N. Besic, L. Beusch, M. Buzzi, L. Clementi, J. Figueras i Ventura, A. M. Hering, E. Leonarduzzi, A. Leuenberger, D. Nerini, L. Nisi, M. Sassi, and U. Germann, 2017
Combined use of complementary methods for a continuous thunderstorm forecast
oral
9th European Conference on Severe Storms 2017, Pula, Croatia

Beusch, L., L. Clementi, U. Hamann, A. M. Hering, E. Leonarduzzi, D. Nerini, L. Nisi, M. Sassi, and U. Germann, 2017
Thunderstorm nowcasting by applying machine learning to a multi-sensor observation and NWP model data base
contributing author
9th European Conference on Severe Storms 2017, Pula, Croatia

Hering, A., L. Nisi, U. Hamann, N. Besic, S. Trefalt, and U. Germann, 2017
Object-based operational nowcasting of severe thunderstorms in the Alpine area
contributing author
9th European Conference on Severe Storms 2017, Pula, Croatia

Besic, N., S. Trefalt, U. Hamann, J. Grazioli, J. Figueras i Ventura, A. Hering, M. Boscacci, M. Gabella, U. Germann, and A. Berne, 2017
Operational hydrometeor classification using polarimetric radar: focus on hail detection
contributing author
HyMeX workshop 2017, Barcelona, Spain

Hamann, U., E. Leonarduzzi, L. Clementi, A. M. Hering, L. Nisi, M. Sassi, U. Germann, 2017
Nowcasting of thunderstorms and severe convection in Switzerland
oral presentation
2nd European Nowcasting Conference 2017, Offenbach, Germany

Germann, U., O. Martius, M. Aebischer, H. Barras, A. Berne, N. Besic, O. Fuhrer, M. Gabella, M. Gaia, U. Hamann, A. Hering, M. Künzler, S. Mattli, L. Nisi, P. Noti, C. Schwierz, L. Thomi, S. Trefalt, and B. Calpini, 2017
A new era of hail monitoring, forecasting and climatology in Switzerland
contributing author
2nd European Hail Workshop 2017, Bern, Switzerland

Hamann, U., E. Leonarduzzi, K. Bedka, N. Besic, L. Clementi, J. Figueras i Ventura, M. Gabella, A. M. Hering, A. Leuenberger, L. Nisi, M. Sassi, U. Germann, 2017
Hail nowcast exploiting radar and satellite observations
oral presentation
2nd European Hail Workshop 2017, Bern, Switzerland

Leonarduzzi, E., U. Hamann, L. Clementi, U. Germann, A. M. Hering, L. Nisi, and M. Sassi, 2016
The estimation of cloud motion for the tracking of convective cells
contributing author
Eumetsat Conference 2016, Darmstadt, Germany

Hamann, U., L. Clementi, M. Gabella, A. M. Hering, E. Leonarduzzi, L. Nisi, and M. Sassi, U. Germann, 2016
Nowcasting of thunderstorms and severe convection in Switzerland
oral presentation
Eumetsat Conference 2016, Darmstadt, Germany

Hamann, U., L. Clementi, M. Gabella, U. Germann, A. M. Hering, E. Leonarduzzi, L. Nisi, and M. Sassi, 2016
Nowcasting of thunderstorms and severe convection in Switzerland
oral presentation
CGMS International Cloud Working Group conference 2016, Lille, France

Hamann, U., E. Leonarduzzi, L. Clementi, M. Gabella, U. Germann, A. M. Hering, L. Nisi, and M. Sassi, 2016
Analysing Convective Events in Switzerland using MSG, Radar and Lightning Observations (COALITION Second Generation)
oral presentation
EUMETSAT's Convection Working Group Workshop 2016, Florence, Italy

Hamann, U., L. Clementi, M. Gabella, U. Germann, A. M. Hering, L. Nisi, and M. Sassi, 2015
Early detection of thunderstorms using satellite and radar observations
oral presentation
European Conference on Severe Storms 2015, Wiener Neustadt, Austria

Hering, A., L. Nisi, G. Della Bruna, M. Gaia, D. Nerini, P. Ambrosetti, U. Hamann, S. Trefalt, and U. Germann, 2015
Fully automated thunderstorm warnings and operational nowcasting at MeteoSwiss
contributing author
European Conference on Severe Storms 2015, Wiener Neustadt, Austria

Hamann, U., L. Nisi, L. Clementi, J. Figueras i Ventura, M. Gabella, A. M. Hering, I. Sideris, S. Trefalt, and U. Germann, 2015
Observing convection with satellite, radar, and lightning measurements
oral presentation
Symposium EGU General Assembly 2015, Vienna, Austria

Hamann, U., A. Walther, S. Kox, A. Takeuchi, R. Bennartz, J. F. Meirink, B. Baum, and R. Roebeling, 2014
The Current Status of Cloud Top Height Remote Sensing from SEVIRI: Updated Assessment Including Two New Algorithms
oral presentation
Eumetsat Conference 2014, Geneva, Switzerland

Hamann, U., L. Nisi, A. Hering, L. Clementi, M. Gabella, and U. Germann, 2014
Investigating the typical development of thunderstorms using satellite, radar and lightning observations
poster presentation
Eumetsat Conference 2014, Geneva, Switzerland

Roebeling R., B. Baum, R. Bennartz, U. Hamann, A. Heidinger, J. F. Meirink, M. Stengel, A. Thoss, A. Walther, and P. Watts, 2014
Outcome of the Fourth Cloud Retrieval Evaluation Workshop
contributing author
Eumetsat Conference 2014, Geneva, Switzerland

Roebeling R., B. Baum, R. Bennartz, U. Hamann, A. Heidinger, J. F. Meirink, M. Stengel, A. Thoss, A. Walther, and P. Watts 2014
Outcome of the Fourth Cloud Retrieval Evaluation Workshop
contributing author
Symposium EGU General Assembly 2014, Vienna, Austria

Hamann, U., A. Walther, R. Bennartz, A. Thoss, J. F. Meirink, and R. Roebeling, 2013
Towards understanding differences between cloud retrievals from passive imagers
poster presentation
Eumetsat Conference 2013, Vienna, Austria

Hamann, U., R. Bennartz, J. F. Meirink, R. Roebeling, and A. Thoss, 2013
Inter-comparison of cloud detection and cloud top height retrievals using the CREW data base
poster presentation
AIP Conf. Proc. 1531, pp. 460-463 (2013), Proceedings of the International Radiation Symposium 2012, Berlin, Germany

Roebeling R., B. Baum, R. Bennartz, U. Hamann, A. Heidinger, A. Thoss, and A. Walther, 2013
Outcome of the Third Cloud Retrieval Evaluation Workshop
contributing author
AIP Conf. Proc. 1531, pp. 416-419 (2013), Proceedings of the International Radiation Symposium 2012, Berlin, Germany

Hamann, U., A. Walther, R. Bennartz, A. Thoss, J. F. M. Meirink, and R. Roebeling, 2012
The CREW Inter-comparison of SEVIRI cloud retrievals
oral presentation
American Geophysical Union Fall Meeting 2012, San Francisco, USA

Hamann, U., R. Bennartz, J. F. Meirink, R. Roebeling, and A. Thoss, 2012
Inter-comparison of cloud property retrievals using the CREW data base
oral presentation
Eumetsat Conference 2012, Sopot, Poland

Roebeling R., B. Baum, U. Hamann, A. Thoss, A. Heidinger, R. Bennartz, and A. Walther, 2012
Outcome of the Third Cloud Retrieval Evaluation Workshop
contributing author
Symposium EGU General Assembly 2012, Vienna, Austria, p.6173

Hamann, U., 2011
Results of the CREW-3 intercomparison
oral presenation
Cloud Retrieval Evaluation Workshop 2011, Madison/Wisconsin, USA, November 2011

Hamann, U., A. Walther, A. Thoss, J. F. Meirink, and R. Roebeling, 2011
Validation of present-day cloud retrieval methods
oral presenation
Eumetsat Conference 2011, Oslo, Norway

Schumann, U., B. Mayer, U. Hamann, and K. Graf, 2010
Radiative heating in contrail cirrus
contributing author
Symposium EGU General Assembly 2010, Vienna, Austria

Weinzierl, B., Y. Gattermann, A. Minikin, H. Schlager, U. Hamann, A. Schäfler, H. Sodemann, J. F. Burkhart, and A. Stohl, 2009
Fire and Ice - Aerosol Properties of Forest Fire Plumes over Greenland during POLARCAT-GRACE 2008
contributing author
MoCa-2009 Joint Assembly, 19-29 Jul. 2009, Montreal, Canada

Hamann, U. and B. Mayer, 2008
The radiation budget of the tropical tropopause layer
oral presentation
International Radiation Symposium 2008, Foz do Iguacu, Brazil

Hamann, U. and B. Mayer, 2007
Horizontal structure of the radiative heating rate in the tropical tropopause layer
oral presentation
EGU General Assembly 2007, Vienna, Austria

Hamann, U. and B. Mayer, 2006
Impact of clouds on the radiation budget of the tropical tropopause layer
poster presentation
EGU General Assembly 2006, Vienna, Austria

Hamann, U., G. Seckmeyer, S. Raasch, and B. Mayer, 2004
Development of the Monte-Carlo radiative transfer model PROMT
poster presentation
International Radiation Symposium 2004, Busan, South Korea
In IRS proceedings 2004: Current Problems in Atmospheric Radiation

Other publications

Schumann, U., B. Mayer, K. Graf, and H. Mannstein, 2012
A parametric radiative forcing model for contrail cirrus
mentioned in the acknoledgement
J. Appl. Meteorol. Clim., 51(6), 1391-1406, doi: 10.1175/JAMC-D-11-0242.1.

Schäfler A., A. Dörnbrack, C. Kiemle, S. Rahm, M. Wirth, 2010
Tropospheric Water Vapor Transport as Determined from Airborne Lidar Measurements.
mentioned in the acknoledgement
J. Atmos. Oceanic Technol., 27, 2017-2030. doi: 10.1175/2010JTECHA1418.1

Hamann, U. and B. Mayer, 2005
Radiation balance of the tropical transition layer
poster presentation
Summerschool on Understanding the role of the Upper Troposphere and Lower Stratosphere in Climate, Cargese, France, 2005