Ph.D., 2000, University of Miami

Cloud Microphysics and Dynamics, Environmental Remote Sensing, Radar Meteorology and Technology

Applied Radar Science Group

Google Scholar Profile


Research Interests
The Applied Radar Science group focuses on the use of cm- and mm-wavelength radars to a wide range of fundamental scientific challenges including cloud and precipitation microphysics, cloud lifetime effects, atmospheric transport and turbulence and the study of complex, heterogeneous systems such as urban and coastal areas. Our group is interested in the practical use of space-borne and phased-array radars in weather and climate research, from extreme weather to wind and solar forecast.

Synergetic remote sensing observations from both space-based and ground-based sensors and their clever use through the development of new inversion algorithms and adaptive sampling strategies constitute our approach for probing clouds and precipitation in their natural environment. As part of our research we use a wide variety of observational platforms, however, millimeter wavelength radars are our primary observing tool for diagnosing the structure, kinematics and microphysics of clouds and precipitation. For more information visit the Applied Radar Science Group web site.


Publications (selected from 2014-2015)


Zhou, X., A.S. Ackerman, A.M. Fridlind, and P. Kollias, 2017: Simulation of mesoscale cellular convection in marine stratocumulus. Part I: Drizzling conditions. J. Atmos. Sci., submitted.

Rémillard, J., A.M. Fridlind, A.S. Ackerman, G. Tselioudis, P. Kollias, D.B. Mechem, H.E. Chandler, E. Luke, R. Wood, M.K. Witte, and J.K. Ayers, 2017: Use of cloud radar Doppler spectra to evaluate stratocumulus drizzle size distributions in large-eddy simulations with size-resolved microphysics. J. Appl. Meteorol. Climatol., Accepted.

Zhang, Y., S. Xie, S.A. Klein, R. Marchand, P. Kollias, E.E. Clothiaux, W. Lin, K. Johnson, D. Swales, A. Bodas-Salcedo, S. Tang, J.M. Haynes, S. Collis, M. Jensen, N. Bharadwaj, J. Hardin, and B. Isom, 2017: The ARM Cloud Radar Simulator for Global Climate Models: A New Tool for Bridging Field Data and Climate Models. Bull. Amer. Meteor. Soc., 0,

Zhang, Y., S.A. Klein, J. Fan, A.S. Chandra, P. Kollias, S. Xie, and S. Tang, 2017 : Large-eddy simulation of shallow cumulus over land: A composite case based on ARM long-term observations at its Southern Great Plains site. J. Atmos. Sci., 0,

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,, 2017

Painemal, D., J.-Y. C. Chiu, P. Minnis, C. Yost, X. Zhou, M. Cadeddu, E. Eloranta, E. R. Lewis, R. Ferrare, and P. Kollias (2017), Aerosol and cloud microphysics covariability 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.

Küchler, N., S. Kneifel, U. Löhnert, P. Kollias, H. Czekala, T. Rose, 2017: A W-band radar-radiometer system for accurate and continuous monitoring of clouds and precipitation, Accepted to Journal of Atmospheric and Oceanic Technology.

Illingworth, A., A. Battaglia, J. Bradford, M. Forsythe, P. Joe, P. Kollias, K. Lean, M. Lori, J.-F. Mahfouf, S. Melo, R. Midthassel, Y. Minro, J. Nicol, R. Potthast, M. Rennie, T. Stein, S. Tanelli, F. Tridon, C. Walden, M. Wolde, 2017. WIVERN: A new satellite concept to provide global in-cloud winds. Accepted to Bull. Amer. Meteor. Soc.

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

Zhou, X., Ackerman, A. S., Fridlind, A. M., Wood, R., and Kollias, P.: Impacts of solar-absorbing aerosol layers on the transition of stratocumulus to trade cumulus clouds, Atmos. Chem. Phys. Discuss.,, in review, 2017.

Acquistapace, C., Kneifel, S., Löhnert, U., Kollias, P., Maahn, M., and Bauer-Pfundstein, M.: Optimizing observations of drizzle onset with millimeter-wavelength radars, Atmos. Meas. Tech., 10, 1783-1802,, 2017.

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

Fang, M., B. Albrecht, E. Jung, P. Kollias, H. Jonsson, and I. PopStefanija, 2017: Retrieval of Vertical Air Motion in Precipitating Clouds Using Mie Scattering and Comparison with In Situ Measurements. J. Appl. Meteor. Climatol., 56, 537–553


Burns, D., P. Kollias, A. Tatarevic, A. Battaglia, and S. Tanelli (2016), The performance of the EarthCARE Cloud Profiling Radar in marine stratiform clouds, J. Geophys. Res. Atmos., 121, 14,525–14,537, doi:10.1002/2016JD025090

Ghate, V.P. and P. Kollias, 2016: On the Controls of Daytime Precipitation in the Amazonian Dry Season. J. Hydrometeor., 17, 3079–3097,

Oue, M., P. Kollias, K. W. North, A. Tatarevic, S. Endo, A. M. Vogelmann, and W. I. Gustafson Jr. (2016), Estimation of cloud fraction profile in shallow convection using a scanning cloud radar, Geophys. Res. Lett., 43, 10,998–11,006, doi:10.1002/2016GL070776.

Wood, R., M.P. Jensen, J. Wang, C.S. Bretherton, S.M. Burrows, A.D. Del Genio, A.M. Fridlind, S.J. Ghan, V.P. Ghate, P. Kollias, S.K. Krueger, R.L. McGraw, M.A. Miller, D. Painemal, L.M. Russell, S.E. Yuter, and P. Zuidema, 2016: Planning the Next Decade of Coordinated Research to Better Understand and Simulate Marine Low Clouds. Bull. Amer. Meteor. Soc., 97, 1699–1702,

Borque, P., E. Luke, and P. Kollias (2016), On the unified estimation of turbulence eddy dissipation rate using Doppler cloud radars and lidars, J. Geophys. Res. Atmos., 120, 5972–5989, doi:10.1002/2015JD024543.

van Lier-Walqui, M., A.M. Fridlind, A.S. Ackerman, S. Collis, J. Helmus, D.R. MacGorman, K. North, P. Kollias, and D.J. Posselt, 2016: On Polarimetric Radar Signatures of Deep Convection for Model Evaluation: Columns of Specific Differential Phase Observed during MC3E. Mon. Wea. Rev., 144, 737–758,

Kollias, P., E.E. Clothiaux, T.P. Ackerman, B.A. Albrecht, K.B. Widener, K.P. Moran, E.P. Luke, K.L. Johnson, N. Bharadwaj, J.B. Mead, M.A. Miller, J. Verlinde, R.T. Marchand, and G.G. Mace, 2016: Development and Applications of ARM Millimeter-Wavelength Cloud Radars. Meteorological Monographs, 57, 17.1–17.19,

Kalesse, H., Szyrmer, W., Kneifel, S., Kollias, P., and Luke, E.: Fingerprints of a riming event on cloud radar Doppler spectra: observations and modeling, Atmos. Chem. Phys., 16, 2997-3012,, 2016.

Kneifel, S., P. Kollias, A. Battaglia, J. Leinonen, M. Maahn, H. Kalesse, and F. Tridon (2016), First observations of triple-frequency radar Doppler spectra in snowfall: Interpretation and applications, Geophys. Res. Lett., 43, 2225–2233, doi:10.1002/2015GL067618.

Jensen, M.P., W.A. Petersen, A. Bansemer, N. Bharadwaj, L.D. Carey, D.J. Cecil, S.M. Collis, A.D. Del Genio, B. Dolan, J. Gerlach, S.E. Giangrande, A. Heymsfield, G. Heymsfield, P. Kollias, T.J. Lang, S.W. Nesbitt, A. Neumann, M. Poellot, S.A. Rutledge, M. Schwaller, A. Tokay, C.R. Williams, D.B. Wolff, S. Xie, and E.J. Zipser, 2016: The Midlatitude Continental Convective Clouds Experiment (MC3E). Bull. Amer. Meteor. Soc., 97, 1667–1686,


Lamer, K. and P. Kollias, 2015: Observations of Fair-weather Cumuli over Land: Dynamical Factors Controlling Cloud Size and Cover. Accepted to Geophysical Research Letters

Stefan Kneifel, Annakaisa von Lerber, Jussi Tiira, Dmitri Moisseev, Pavlos Kollias, and Jussi Leinonen, 2015: Observed Relations between Snowfall Microphysics 1and Triple-frequency Radar Measurements. Accepted, Journal of Geophysical Research – Atmospheres

Jiwen Fan, Yi-Chin Liu, Kuan-Man Xu, Kirk North, Scott Collis, Xiquan Dong, Guang J. Zhang, Qian Chen, Kollias Pavlos, and Steven J. Ghan, 2015: Improving Representation of Convective Transport for Scale-Aware Parameterization – Part I: Convection and Cloud Properties Simulated with Spectral-Bin and Bulk Microphysics. Accepted, Journal of Geophysical Research – Atmospheres

Lamer, K., P. Kollias and L. Nuijens, 2014: Observations of the temporal and vertical variability of shallow oceanic trade cumulus cloudiness in relation to their mass flux and environment. Accepted, Journal of Geophysical Research – Atmospheres

Zermeno, D., C. Zhang, P. Kollias and H. Kalesse, 2015: Shallow Cloud Moistening in MJO and non-MJO Large-Scale Convective Events over the ARM Manus Site. Accepted to J. Atmospheric Sciences.

Mechem, D., Giangrande, C. Fish, P. Borque, T. Toto and P. Kollias, 2015: Insights from modeling and observational evaluation of a precipitating continental cumulus event observed during the MC3E field campaign. Accepted to the Journal of Geophysical Research.

Skofronick-Jackson, G., et al., 2014: Global Precipitation Measurement Cold Season Precipitation Experiment (GCPEx): For Measurement Sake Let it Snow. Accepted to the Bull. Amer. Meteo. Soc.

Maahn, M., U. Lohnert, P. Kollias, R. C. Jackson and G. M. McFarquhar, 2014: Observing Ice Clouds with Doppler Radar Higher Moments. Part 1: Evaluating Ice Cloud Parametrizations. Accepted to the Journal of Atmospheric and Oceanic Technology

Zhou, X., P. Kollias and E. Lewis, 2014: Clouds, Precipitation and Marine Boundary Layer Structure during MAGIC. Accepted to the Journal of Climate.

Battaglia, A. and P. Kollias, 2014: Doppler performance assessment of a space-borne cloud stereo-radar concept for a hurricane system. Accepted to Journal of Atmospheric and Oceanic Technology

Battaglia, A. and P. Kollias, 2014: Using ice clouds for mitigating the EarthCARE Doppler radar mispointing. Accepted to IEEE Transactions on Geoscience and Remote Sensing.

Chandra A, C Zhang, P Kollias, S Matrosov, and W Szyrmer. 2014. “Automated rain rate estimates using the Ka-band ARM Zenith Radar (KAZR).” Accepted to Atmospheric Measurement Techniques

Wood, R., et al., 2014: Clouds, Aerosols, and Precipitation in the Marine Boundary Layer: An ARM Mobile Facility Deployment. Accepted to Bulletin of Amer. Meteor. Soc.

Illingworth A., et al., 2014: THE EARTHCARE SATELLITE: The next step forward in global measurements of clouds, aerosols, precipitation and radiation. Accepted to Bulletin of Amer. Meteor. Soc.

Kollias, P., E. E. Clothiaux, T. P. Ackerman, B. A. Albrecht, K. B. Widener, K. P. Moran, E. P. Luke, K. L. Johnson, N. Bharadwaj, J. B. Mead, M. A. Miller, J. Verlinde, R. T. Marchand and G. G. Mace, 2014: Development and Applications of the ARM Millimeter Wavelength Cloud Radar. Chapter, AMS ARM Monograph


Muhlbauer, A., H. Kalesse and P. Kollias, 2014: Vertical velocities and turbulence in midlatitude anvil cirrus: A comparison between in situ aircraft measurements and ground-based Doppler cloud radar retrievals. DOI: 10.1002/2014GL062279

Borque, P., P. Kollias and S. Giangrande, 2014: First Light Observations of Tracking Clouds Using Scanning ARM Cloud Radars. Journal of Applied Meteorology and Climatology, DOI:

Battaglia, A., Westbrook, C. D., Kneifel, S., Kollias, P., Humpage, N., Löhnert, U., Tyynelä, J., and Petty, G. W. 2014: G band atmospheric radars: new frontiers in cloud physics, Atmos. Meas. Tech., 7, 1527-1546, doi:10.5194/amt-7-1527-2014

Meunier, V., D. D. Turner and P. Kollias, 2014: On the challenges of tomography retrievals of a 2D water vapor field using ground-based microwave radiometers: An observation system simulation experiment. J. Atmos. Oceanic Tech. DOI:

Fang, M., B. Albrecht, V. Ghate and P. Kollias, 2014: Turbulence in Continental Stratocumulus Part II: Eddy Dissipation Rates and Large Eddy Coherent Structures. Boundary-Layer Meteorology March 2014,Volume 150, Issue 3, pp 361-380

Fang, M., B. Albrecht, V. Ghate and P. Kollias, 2014: Turbulence in Continental Stratocumulus Part I: External Forcing and Turbulence Structures Boundary-Layer Meteorology March 2014,Volume 150, Issue 3, pp 341-360

Kollias, Pavlos, Simone Tanelli, Alessandro Battaglia, Aleksandra Tatarevic, 2014: Evaluation of EarthCARE Cloud Profiling Radar Doppler Velocity Measurements in Particle Sedimentation Regimes. Atmos. Oceanic Technol.31, 366–386. doi:

Kollias, Pavlos, and Coauthors, 2014: Scanning ARM Cloud Radars. Part II: Data Quality Control and Processing.  Atmos. Oceanic Technol.31, 583–598.

Kollias, Pavlos, Nitin Bharadwaj, Kevin Widener, Ieng Jo, Karen Johnson, 2014: Scanning ARM Cloud Radars. Part I: Operational Sampling Strategies. J. Atmos. Oceanic Technol., 31, 569–582

Battaglia, A. and P. Kollias, 2014: Impact of Receiver Saturation on Surface Doppler velocity measurements from the EarthCARE Cloud Profiling Radar. IEEE Transactions on Geoscience and Remote Sensing, 53, 3, 1205-1212.


Featured articles are listed below:

New Faculty Research Awards

Congratulations to our faculty for their recent research awards!Gordon Taylor received a new NSF award, in the amount $514,960, in support of the project "Collaborative Research: Key Microbial Processes in Oxygen Minimum Zones: From in Situ Community Rate Measurements...

SoMAS Faculty Receive SBU-BNL SEED Grant for Collaborative Research

The SBU-BNL Seed Grant program serves to foster collaborative efforts between scientists at the University and BNL. It is a key opportunity for developing synergistic activities that can grow joint research programs aligned with the strategic plans of both...

SoMAS Study Uses Radar to Better Predict Shallow Cloud Coverage

Shallow convection plays a critical role in the heat and moisture transfer between the boundary layer and free atmosphere above about 2 km. However, with an average spatial scale of 0.5–1.5 km, shallow cumuli are not resolved in weather forecast and climate models,...

ITPA-BNL Joint Symposium

Brookhaven National Laboratory – Berkner Hall, Room B – Friday, April 29, 2005

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