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Stefan Kneifel

Post Doctoral Fellow

Dep. Of Atmospheric and Oceanic Sciences,
McGill University 805 Sherbrooke Street West,
Montreal, QC, H3A 2K6

 

skneifel@meteo.uni-koeln.de


https://www.researchgate.net/profile/Stefan_Kneifel
Stefan Kneifel

SUMMARY OF QUALIFICATIONS

  • Analysis of multi-frequency Doppler spectra from ice and snow clouds
  • Cloud microphysics with focus on snow and mixed-phased clouds
  • Active and passive radiative transfer in the microwave region. Realistic scattering properties of ice and snow particles

EDUCATION

  • 2008 - 2011 PhD (Dr. rer. nat.) in Meteorology at the University of Cologne, Germany.
  • 2002 – 04/2008 Diploma (equiv. M.S. degree) in Meteorology obtained at the Ludwig-Maximilians-University Munich, Germany,
    • Subject: Modelling and observation of horizontal water vapor inhomogeneities using microwave radiometry, in german.

RESEARCH EXPERIENCE

  • 09/2013-present: Postdoctoral Fellow (18 months DAAD fellowship) at McGill University; Main topic: Analysis of multi-frequency Doppler radar spectra for investigation of cold cloud microphysics.
  • 05/2011 - 07/2013: PostDoc at the Institute of Geophysics and Meteorology, University of Cologne (WG Prof. Susanne Crewell) within the Reanalysis project of the Hans– Ertel Centre for Weather Research, German Weather Service.
  • 05/2008 – 05/2011: Scientific Assistant at the Institute of Geophysics and Meteorology, University of Cologne (WG Prof. Susanne Crewell) within the Towards an optimal estimation based snowfall characterization algorithm (TOSCA) project (DFG).
  • 10/2006 – 05/2008: Student Research Assistant in the field of passive microwave radiometry at the Institute of Meteorology, University of Munich
  • 11/2004 – 01/2006: Student Research Assistant at the Institute of Meteorology, University of Munich within the DWD project: HUBOLA – Comparison of humidity data from the ATOVS and SEVIRI systems with ground–based radiosondes,microwave radiometers, and GPS measurements., Scientific Report, DWD, 05/2005.
  • 09/2002-10/2002: Working student, Institue for Atmospheric Physics, German Airospace Center (DLR), Oberpfaffenhofen, Germany: Development of an electric field mill for observing the atmospheric electric field of thunderstorms.
  • 06/2002-07/2002: Voluntary Internship, German Weather Service (DWD), Hohenpeißenberg Observatory, VERTICATOR project.

INTERNATIONAL EXPERIENCE

  • 12/2010 – 01/2011: Stay at the Belgian Princess Elisabeth Antarctic station, Soer Rondane Mountains, East Antarctica, within the HYDRANT project, (BELSPO, Prof. van Lipzig).
  • 09/2010 – 11/2010: Visiting scientist at the University of Wisconsin, Madison, with Prof. Bennartz. Work on multi-frequency radar methods for remote sensing of snowfall.
  • 04/2006 – 09/2006: Scientific Assistant at the University of Bergen, Norway, with Prof. Reuder. Development of sensors and a data acquisition system for the observation of wind, temperature and humidity using small unmanned airplanes.

TEACHING EXPERIENCE

  • 2014: Lecturer for course ATOC-309 "Weather Radars and Satellites" , McGill University, Montreal
  • 2009 - 2012: Teaching Assistant, Institute of Geophysics and Meteorology, University of Cologne:
    • Tutorial courses for Master students in Radiation, Clouds, Precipitation (WS 2011/2012)
    • Supervision of Laboratory courses for undergraduate Meteorology students (SS2009, SS2011)
    • Supervision of Field Practical Courses for graduate Meteorology students (SS 2012)

AWARDS

LANGUAGES

  • Fluency in English and German

SELECTED PUBLICATIONS

  1. Gorodetskaya, I.V., S. Kneifel, M. Maahn, K. Van Tricht, J. H. Schween, S. Crewell, and N. P. M. Van Lipzig, Cloud and precipitation properties from ground-based remote sensing instruments in East Antarctica The Cryosphere Discuss., 8, 4195-4241, 2014.
  2. Kneifel, S., S. Redl, E. Orlandi, U. Löhnert, M.P. Cadeddu, D.D. Turner, M.-T. Chen, 2014: Absorption Properties of Supercooled Liquid Water between 31 and 225 GHz: Evaluation of Absorption Models Using Ground-Based Observations. J. Appl. Meteor. Climatol., 53, 1028–1045. doi: http://dx.doi.org/10.1175/JAMC-D-13-0214.1
  3. Kulie, M.S., M.J. Hiley, R. Bennartz, S. Kneifel, S. Tanelli, 2014: Triple-Frequency Radar Reflectivity Signatures of Snow: Observations and Comparisons with Theoretical Ice Particle Scattering Models. J. Appl. Meteor. Climatol., 53, 1080–1098. doi: http://dx.doi.org/10.1175/JAMC-D-13-066.1
  4. Battaglia, A., Westbrook, C. D., Kneifel, S., Kollias, P., Humpage, N., Löhnert, U., Tyynelä, J., and Petty, G. W.: G-band atmospheric radars: new frontiers in cloud physics, Atmos. Meas. Tech. Discuss., 7, 321-375, doi:10.5194/amtd-7-321-2014, 2014.
  5. Leinonen, J., S. Kneifel, D. Moisseev, J. Tyynelä, S. Tanelli, and T. P. Nousiainen (2012), Evidence of nonspheroidal behavior in millimeter-wavelength radar observations of snowfall, J. Geophys. Res., doi:10.1029/2012JD017680
  6. Xie, X., U. Lohnert, S. Kneifel, and S. Crewell: Snow particle orientation observed by groundbased microwave radiometry, J. Geophys. Res., 117, D02206.
  7. Kneifel, S., M. Maahn, G. Peters, and C. Simmer, 2011: Observation of snowfall with a low power FMCW K-band radar (Micro Rain Radar), Meteorol. Atmos. Phys., 113, 75–87.
  8. Lohnert, U., S. Kneifel, A. Battaglia, M. Hagen, L. Hirsch, and S. Crewell, 2011: A Multisensor Approach Toward a Better Understanding of Snowfall Microphysics: The TOSCA Project. Bull. Amer. Meteor. Soc., 92, 613–628.
  9. Kneifel, S., U. Lohnert, A. Battaglia, and S. Crewell, and D. Siebler, 2010: Snow scattering signals in groundbased passive microwave radiometer measurements, J. Geophys. Res., 115, D16214.
  10. Kneifel, S., S. Crewell, U. Lohnert and J. Schween, 2009: Investigating water vapor variability by groundbased microwave radiometry: Evaluation using airborne observations, IEEE Geosci. Remote Sens. Lett., 6(1), 157-161, DOI.10.1109/LGRS.2008.2007659.