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Pavlos Kollias

Atmospheric Scientist - Joint Appointment

Kollias is a Professor at the School of Marine and Atmospheric Sciences at Stony Brook University – State University of New York and has a joint appointment with the Department of Environmental and Climate Sciences at Brookhaven National Laboratory. His research focuses on the understanding of the microphysical, dynamical and radiative processes that act at the cloud- and meso-scale and their accurate representation in numerical models. He is also interested in radar technology and the applications of radars in weather and climate research. Kollias is an international leader in the application of short wavelength radars for cloud and precipitation research from ground-based and space-based platforms. Kollias has published over 95 scientific articles in peer-reviewed literature in the areas of millimeter wavelength radar research, cloud and precipitation physics.

Pavlos Kollias is the leader of the DOE Atmospheric Systems Research (ASR) radar science group. He is a member of the Mission Advisory Group and algorithm development team of the European Space Agency Earth Clouds Aerosols Radiation Experiment (EARTHCARE) Explorer Mission. He has served as a member at the National Science Foundation Engineering Research Center for the Collaborative Adaptive Sensing of the Atmosphere. Kollias also served for three years (2007-2009) as Associate Chief Scientist for the US DOE Atmospheric Radiation Measurements (ARM) program. He has served as the Chair of the American Meteorological Society (AMS) Committee on Radar Meteorology and has organized and chaired numerous sessions in international conferences. Kollias has also organized and participated as guest lecturer in several short courses in Europe, North America and Asia on the use of radars in atmospheric research.


  • Ph.D. in Meteorology, University of Miami.
  • M.S. in Atmospheric Science, The University of Athens, Greece.
  • B.S. in Physics, The University of Athens, Greece.

Areas of Interest

  • Cloud microphysics and dynamics
  • Boundary layer turbulence
  • Radar technology and meteorology

Awards, Honors and Memberships

  • 2013-2014: Humboldt Research Fellowship for experienced researchers, Germany
  • 2012-2017: Canada Research Chair in Radar Applications in Weather and Climate
  • 2007-2012: Canada Research Chair in Radar Applications in Weather and Climate
  • 2003-2004: Visiting Scientist Fellowship, Cooperative Institute for Research in Environmental Sciences, University of Colorado
  • 2003: NASA Group Achievement Award “for the Cirrus Regional Study of Tropical Anvils and Cirrus Layers – Florida Area Cirrus Experiment (CRYSTAL-FACE)


  • 2016-present Professor, Stony Brook University, Stony Brook NY
  • 2016-present Atmospheric Scientist, Brookhaven National Laboratory, Upton NY
  • 2016-present International Faculty, University of Cologne, Cologne Germany
  • 2012-2016 Associate Professor and Canada Research Chair, McGill University, Montreal Canada
  • 2007-2012 Assistant Professor and Canada Research Chair, McGill University, Montreal Canada
  • 2005-2007 Associate Scientist, Brookhaven National Laboratory, Upton NY
  • 2004-2005 Assistant Scientist, University of Miami, Miami, FL
  • 2003-2004 Visiting Fellow Scientist, University of Colorado, Boulder, CO
  • 2002-2003 Assistant Scientist, University of Miami, Miami, FL
  • 2001-2002 Postdoctoral Associate, University of Miami, Miami, FL

External Service

  • Member, User Executive Committee, Atmospheric Radiation Measurements program, 2015-present
  • Associate Partner, Initial Training for atmospheric Remote Sensing (ITaRS), 2014-present
  • Leader, Radar Science Group, DOE Atmospheric Systems Research program 2012-present
  • Member, Mission Advisory Group, Phase C/D, ESA EarthCARE mission, 2012-present
  • Associate Editor, AGU Journal of Geophysical Research – Atmospheres, 2012-present
  • Adjunct Associate Professor, University of Miami, 2011-present
  • Associate Editor, AMS Journal of Atmospheric and Oceanic Technology, 2012-2015
  • Chair, AMS Committee on Radar Meteorology, 2010-2012
  • Leader, Vertical Velocity for Climate Modelers Group, DOE/ARM program, 2008-2012
  • Associate Chief Scientist, DOE Atmospheric Radiation Measurement program, 2007-2009
  • Member, Executive Committee, National Science Foundation Engineering Research Center on the Collaborative Adapting Sensing of the Atmosphere (CASA), 2008-2012

Selected Publications

Lamer, K., Fridlind, A. M., Ackerman, A. S., Kollias, P., Clothiaux, E. E., and Kelley, M. (GO)2-SIM: a GCM-oriented ground-observation forward-simulator framework for objective evaluation of cloud and precipitation phase. Geosci. Model Dev. 11, 4195-4214, doi:10.5194/gmd-11-4195-2018 (2018).

Kollias, P., McLaughlin, D. J., Frasier, S., Oue, M., Luke, E., and Sneddon, A. Advances and applications in low-power phased array X-band weather radars. 2018 IEEE Radar Conference (RadarConf18), 23-27 April 2018, pp. 1359-1364, 2018.

Chen, Y. S., Verlinde, J., Clothiaux, E. E., Ackerman, A. S., Fridlind, A. M., Chamecki, M., Kollias, P., Kirkpatrick, M. P., Chen, B. C., Yu, G., and Avramov, A. On the Forward Modeling of Radar Doppler Spectrum Width From LES: Implications for Model Evaluation. J. Geophys. Res. Atmos. 123, 7444-7461, doi:10.1029/2017JD028104 (2018).

Borque, P., Luke, E. P., Kollias, P., and Yang, F. Relationship Between Turbulence and Drizzle in Continental and Marine Low Stratiform Clouds. J. Atmos. Sci., accepted, doi:10.1175/JAS-D-18-0060.1 (2018).

Yang, F., Kollias, P., Shaw, R. A., and Vogelmann, A. M. Cloud droplet size distribution broadening during diffusional growth: ripening amplified by deactivation and reactivation. Atmos. Chem. Phys. Discuss. 18, 7313-7328, doi:10.5194/acp-2017-1125 (2018).

Yang, F., Luke, E. P., Kollias, P., Kostinski, A. B., and Vogelmann, A. M. Scaling of drizzle virga depth with cloud thickness for marine stratocumulus clouds. Geophy. Res. Lettrs 45, online, doi:10.1029/2018GL077145 (2018).

Oue, M., Kollias, P., Ryzhkov, A., and Luke, E. P. Towards Exploring the Synergy between Cloud Radar Polarimetry and Doppler Spectral Analysis in Deep Cold Precipitating Systems in the Arctic. J. Geophys. Res. Atmos. 23, 2797-2815, doi:10.1002/2017JD027717 (2018).

Zhou, X., Ackerman, A. S., Fridlind, A. M., and Kollias, P. Simulation of Mesoscale Cellular Convection in Marine Stratocumulus. Part I: Drizzling Conditions. J. Atmos. Sci. 75, 257-274, doi:10.1175/JAS-D-17-0070.1 (2018).

Zhang, D., Wang, Z., Kollias, P., Vogelmann, A. M., Yang, K., and Luo, T. Ice particle production in mid-level stratiform mixed-phase clouds observed with collocated A-Train measurements. Atmos. Chem. Phys. 18, 4317-4327, doi:10.5194/acp-18-4317-2018 (2018).

Rémillard, J., Fridlind, A. M., Ackerman, A. S., Tselioudis, G., Kollias, P., Mechem, D. B., Chandler, H. E., Luke, E., Wood, R., Witte, M. K., Chuang, P. Y., and Ayers, J. K. Use of cloud radar Doppler spectra to evaluate stratocumulus drizzle size distributions in large-eddy simulations with size-resolved microphysics. J. Applied Meteorol. Clim. 56, 3263-3283, doi:10.1175/JAMC-D-17-0100.1 (2017).

Zhang, Y., Xie, S., Klein, S. A., Marchand, R., Kollias, P., Clothiaux, E. E., Lin, W., Johnson, K., Swales, D., Bodas-Salcedo, A., Tang, S., Haynes, J. M., Collis, S., Jensen, M., Bharadwaj, N., Hardin, J., and Isom, B. The ARM Cloud Radar Simulator for Global Climate Models: A New Tool for Bridging Field Data and Climate Models. Bull. Amer. Meteorol. Soc. 99, 21-26, doi:10.1175/BAMS-D-16-0258.1 (2018).

Fan, J., Han, B., Varble, A., Morrison, H., North, K., Kollias, P., Chen, B., Dong, X., Giangrande, S. E., Khain, A., Lin, Y., Mansell, E., Milbrandt, J., Stenz, R., Thompson, G., and Wang, Y. Cloud-Resolving Model Intercomparison of an MC3E Squall Line Case: Part I – Convective Updrafts. J. Geophys. Res. Atmos. 122, 9351-9378, doi:10.1002/2017JD026622 (2017).

North, K. W., Oue, M., Kollias, P., Giangrande, S. E., Collis, S. M., and Potvin, C. K. Vertical air motion retrievals in deep convective clouds using the ARM scanning radar network in Oklahoma during MC3E. Atmos. Meas. Tech. 10, 2785-2806, doi:10.5194/amt-10-2785-2017 (2017).

Painemal, D., Chiu, J. Y. C., Minnis, P., Yost, C., Zhou, X., Cadeddu, M., Eloranta, E., Lewis, E. R., Ferrare, R., and Kollias, P. Aerosol and cloud microphysics co-variability in the northeast Pacific boundary layer estimated with ship-based and satellite remote sensing observations. J. Geophys. Res. Atmos. 122, 2403-2418, doi:10.1002/ 2016JD025771 (2017).

Tridon, F., Battaglia, A., Luke, E., and Kollias, P. Rain retrieval from dual-frequency radar Doppler spectra: validation and potential for a midlatitude precipitating case-study. Q. J. Royal Meteorol. Soc. 143, 1364-1380, doi:10.1002/qj.3010 (2017).

Zhou, X., Heus, T., and Kollias, P. Influences of drizzle on stratocumulus cloudiness and organization. J. Geophys. Res. Atmos. 122, 6989-7003, doi:10.1002/2017JD026641 (2017).

Ghate, V. P. and Kollias, P. On the Controls of Daytime Precipitation in the Amazonian Dry Season.  J. Hydrometeorol. 17, 3079-3097, doi:10.1175/JHM-D-16-0101.1 (2016).

Lamer, K., and P. Kollias (2015), Observations of fair-weather cumuli over land: Dynamical factors controlling cloud size and cover.  Geophys. Res. Lett. 42, 8693-8701, doi:10.1002/2015GL064534.

Zhou, X., P. Kollias, and E. R. Lewis, 2015: Clouds, Precipitation, and Marine Boundary Layer Structure during the MAGIC Field Campaign.  J. Climate 28, 2420-2442. doi:10.1175/JCLI-D-14-00320.1.

Maximilian Maahn, Ulrich Löhnert, Pavlos Kollias, Robert C. Jackson, and Greg M. McFarquhar, 2015: Developing and Evaluating Ice Cloud Parameterizations for Forward Modeling of Radar Moments Using in situ Aircraft Observations.  J. Atmos. Oceanic Technol. 32, 880-903, doi:10.1175/JTECH-D-14-00112.1.

Kneifel, S., A.von Lerber, J. Tiira, D. Moisseev, P. Kollias, and J. Leinonen (2015), Observed relations between snowfall microphysics and triple-frequency radar measurements.  J. Geophys. Res. Atmos. 120, 6034-6055, doi:10.1002/2015JD023156.

Kollias, Pavlos, Simone Tanelli, Alessandro Battaglia, Aleksandra Tatarevic, 2014: Evaluation of EarthCARE Cloud Profiling Radar Doppler Velocity Measurements in Particle Sedimentation Regimes.  J. Atmos. Oceanic Technol. 31, 366-386, doi:10.1175/JTECH-D-11-00202.1.

Kollias P., N. Bharadwaj, K., Widener, I., Jo and K., Johnson, 2014: Scanning ARM Cloud Radars -  Part I: Operational Sampling Strategies.  J. Atmos. Oceanic Technol., e-View, doi:10.1175/JTECH-D-13-00044.1.

Kollias P., I. Jo P. Borque P., A. Tatarevic, K. Lamer, N. Bharadwaj, K., Widener, K., Johnson and E. Clothiaux 2014: Scanning ARM Cloud Radars -  Part II: Data Quality Control and Processing. J. Atmos. Oceanic Technol., e-View, doi:10.1175/JTECH-D-13-00045.1.

Luke, E., and P. Kollias, 2013: Separating Cloud and Drizzle Radar Moments during Precipitation Onset using Doppler Spectra.  J. Atmos. Oceanic Technol., e-View, doi:10.1175/JTECH-D-11-00195.1.

Kollias, P., J. Remillard, E. Luke and W. Szyrmer, 2011a: Cloud Radar Doppler Spectra in Drizzling Stratiform Clouds. Part I: Forward Modeling and Remote Sensing Applications.  J. Geophys. Res.-Atmos., doi:10.1029/2010JD015237.

Kollias P., W. Szyrmer, J. Remillard and E. Luke, 2011b: Cloud Radar Doppler Spectra in Drizzling Stratiform Clouds. Part II: Observations and Microphysical Modeling of Drizzle Evolution.  J. Geophys. Res.-Atmos., doi:10.1029/2010JD015238.