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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. 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
  2. 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
  3. 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.
  4. Leinonen, J., S. Kneifel , D. Moisseev , J. Tyynela , S. Tanelli, and T. Nousiainen: Evidence of nonspheroidal behavior in millimeter wavelength radar observations of snowfall, J. Geophys. Res., accepted.
  5. Xie, X., U. Lohnert, S. Kneifel, and S. Crewell: Snow particle orientation observed by groundbased microwave radiometry, J. Geophys. Res., 117, D02206.
  6. 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.
  7. 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.
  8. 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.
  9. 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.