CURRICULUM VITAE
Juanzhen Sun
PERSONAL
Home Address:
1142 Crestmoor Dr.
Boulder, CO 80303
(303)-543-1189
DOB: March 12, 1961
Work Address:
National Center for Atmospheric Research
P.O.Box 3000
Boulder, CO 80307-3000
(303)-497-8957
E-mail: sunj@ucar.edu
EDUCATION INFORMATION
May 1992
Ph.D., Meteorology, University of Oklahoma, Norman, Oklahoma
May 1988
M.S., Meteorology, University of Oklahoma, Norman, Oklahoma
July 1982
B.S., Meteorology, Lanzhou University, Lanzhou, Gansu, P.R.C.
Title of Ph.D thesis: Convective scale 4-D data assimilation using simulated single-Doppler
radar observations
WORK HISTORY
2005/6- Present Scientist III, Research Applications Laboratory (RAL) and Mesoscale and
Microscale Meteorology (MMM) Division, National Center for
Atmospheric Research (NCAR), Boulder, CO.
2001/6- 2005/5
Scientist II, RAL & MMM, NCAR, Boulder, CO.
1999/10-2001/5
Scientist I, RAL and MMM, NCAR, Boulder, CO.
1997/10-1999/9
Project Scientist, MMM and RAP, NCAR, Boulder, CO.
1994/1-1997/9
Associate Scientist, MMM and RAP, NCAR, Boulder, CO.
1992/1-1993/12
Visiting Scientist, MMM and RAP, NCAR, Boulder, CO.
1990/8-1991/12
Research Assistant, University of Oklahoma, Norman, OK.
1988/8-1990/7
Graduate Fellowship, Advanced Study Program, NCAR, Boulder, CO.
1986/1-1988/7
Research Assistant, University of Oklahoma, Norman, OK.
1982/8-1885/12
Weather Forecaster, Provincial Meteorological Bureau of Gansu, Lanzhou,
Gansu, P.R.C.
PROFESSIONAL ACTIVITIES
Educational
1995-2012
Member of Thesis Committees for Ph.D. students of Taiwan Central
University, Taiwain, University of Cobenhagen
1
2004
Mentor of Marc Chan, a summer intern student from the Johns Hopkins
University
2000-2003
Thesis Committee, Department of Mechanical Engineering, University of
Iowa.
1995-1996
Thesis Committee, Department of Meteorology, University of Oklahoma.
Scientific Committee Work
2006-Present
Chair, NCAR STEP program executive committee
2006-Present
Member, WMO WWRP Nowcasting Working Group
2004-2006
Member, CMS Radar Meteorology Committee, China
2002-2005
2000-2006
Member, AMS Radar Meteorology Committee
WRF-Var working group committee
Conference Organization
2012
Convener, Data Assimilation Session in AGU 2011 Fall Meeting
2011
Member, organizing committee for WMO nwcasting symposium
on nowcasting WSN 12
2011
Convener, Data Assimilation Session in AGU 2011 Fall Meeting
2011
Organizer, WMO workshop on Use of NWP in Nowcasting
2009
Organized and chaired a panel discussion for a WMO Symposium in
Nowcasting.
2007
Organized and chaired Data Assimilation Session in the 33rd International
Conference on Radar Meteorology
2006
Chaired Nowcasting Session in 5th ICMCS Conference
2003
NCAR/ASP Colloquium on Data Assimilation for Atmospheric
and Climate Prediction
2002
Organized and chaired Data Assimilation Session in the 31st Conference on
Radar Meteorology
HONORS AND AWARDS
2006
Nominated for UCAR Science and Technology Advancement Award
2001
Received NCAR Outstanding Publication Award [7,8]
REFERRED PUBLICATIONS
Sun J., D. Flicker, and D. K. Lilly, 1991: Recovery of three-dimensional wind and temperature
from simulated single-Doppler radar data. J. Atmos. Sci., 48, 876-890.
Sun J., 1992: Fitting a Cartesian prediction model to radial velocity data from single- Doppler
radar. J. Atmos. Oceanic Technol., 11, 200-204.
Sun J., and N. A. Crook, 1994: Wind and thermodynamic retrieval from single-Doppler
measurements of a gust front observed during Phoenix-II. Mon. Wea. Rev., 122, 10751091.
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Sun J., and N. A. Crook, 1996: Comparison of thermodynamic retrieval by the adjoint method
with the traditional retrieval method. Mon. Wea. Rev., 124, 308-324.
Sun J., and N. A. Crook, 1997: Dynamical and microphysical retrieval from Doppler radar
observations using a cloud model and its adjoint: Part I. model development and
simulated data experiments. J. Atmos. Sci., 54, 1642-1661.
Sun J., and N.A. Crook, 1998: Dynamical and microphysical retrieval from Doppler radar
observations using a cloud model and its adjoint: Part II. Retrieval experiments of an
observed Florida convective storm, J. Atmos. Sci., 55, 835-852.
Wilson, J., N. A. Crook, C. K. Mueller, J. Sun, and M. Dixon, 1998: Nowcasting thunderstorms:
A status report. Bull. Amer. Meteor. Soc., 79, 2079-2099.
Wu, B., J. Verlinde, and J. Sun, 2000: Dynamical and microphysical retrievals from Doppler
radar observations of a deep convective cloud. J. Atmos. Sci., 57, 262- 283.
Warner, T., E. A. Brandes, J. Sun, D. N. Yates, and C. K. Mueller, 2000: Prediction of a flash
flood in complex terrain. Part I: a comparison of rainfall estimates from radar, and very
short range rainfall simulations from a dynamic model and a automated algorithmic
system. J. Appl. Meteor., 39, 797-814.
Yates, D. N., T. Warner, E. E. Brandes, C. K. Mueller, J. Sun, and G. H. Leavesley, 2001:
Evaluation of flash flood discharge forecasts in complex terrain using precipitation. J.
Hydrologic Engineering, 6, 265-274.
Lin, C.-L., T. Chai, and J. Sun, 2001: Retrieval of flow structure in a convective boundary layer
using an adjoint model: identical twin experiments. J. Atmos. Sci., 58, 1767- 1783.
Sun, J., and N. A. Crook, 2001: Real-time low-level wind and temperature analysis using single
WSR-88D data, Wea. Forecasting, 16, 117-132.
Crook, N., A., and J. Sun, 2002: Assimilating radar, surface and profiler data for the Sydney
2000 forecast demonstration project. J. Atmos. Oceanic Technol., 19, 888-898.
Lin, C.-L., T. Chai, and J. Sun, 2002: On the smoothness constraints for four-dimensional data
assimilation, J. Comput. Phys, 181, 430-453.
Zhang, F., C. Snyder, and J. Sun, 2003: Impacts of initial estimate and observations on
convective-scale data assimilations with an ensemble Kalman filter. Mon. Wea. Rev., 132,
1238-1253.
Sun J., and J. W. Wilson, 2003: The assimilation of radar data for weather prediction. Radar and
atmospheric science: a collection of essays in honor of David Atlas, R. Wakimoto and R.
Srivastava (Editors), Amer. Meteor. Soc., 175-198.
Crook, N. A., and J. Sun, 2004: Analysis and forecasting of the low-level wind during the
Sydney 2000 forecast demonstration project. Wea. Forecasting., 19, 151-167.
Sun, J., 2004: Numerical prediction of thunderstorms: fourteen years later, Atmospheric
turbulence and mesoscale meteorology, E. Fedorovich, R. Rotunno, B. Stevens (Editors),
Cambridge University Press. 139-164.
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Caya, A., J. Sun, and C. Snyder, 2005: A comparison between the 4D-Var and the ensemble
Kalman filter techniques for radar data assimilation. Mon. Wea. Rev., 133, 3081-3094.
Sun, J., 2005: Initialization and numerical forecasting of a supercell storm observed during
STEPS. Mon. Wea. Rev., 133, 793-813.
Dabberdt, W. F., T. W. Schlatter, F. H. Carr, E. W. J. Friday, D. Jorgensen, S. Koch, M. Pirone,
M. Ralph, J. Sun, P. Welsh, J. Wilson, and X. Zou, 2005: Multifunctional mesoscale
observing networks. Bull. Amer. Met. Soc., 86, 961-982.
Sun, J., 2005: Convective-scale assimilation of radar data: progress and challenges. Q. J. R.
Meteorol. Soc., 131, 3439-3463.
Xiao, Q., Y.-H. Kuo, J. Sun, W.-C. Lee, E. Lim, Y. Guo, D. M. Barker, 2005: Assimilation of
Doppler radar observations with a regional 3D-Var system: impact of Doppler velocities
on forecasts of a heavy rainfall case. J. Appl. Meteor. 44, 768-788.
Brandes, E. A., G. Zhang, and J. Sun, 2006: The influence of assumed drop size distribution form
on radar-retrieved thunderstorm microphysics: A study with polarimetric radar. J. Appl.
Meteor., 45, 259-269
Zhang, G., J. Sun, and E. A. Brandes, 2006: Improving parameterization of rain microphysics
with disdrometer and radar observations. J. Atmos. Sci., 63, 1273-1290.
Warner T., and Coauthors, 2007: The Pentagon SHIELD field program - Toward critical
infrastructure protection. Bull. Amer. Met. Soc., 88, 167-176.
Xiao, Q., Y.-H. Kuo, J. Sun, W.-C. Lee, and D. Barker, 2007: An Approach of Doppler
Reflectivity Data Assimilation and its Assessment with the Inland QPF of Typhoon Rusa
(2002) at Landfall, J. Appl. Meteor., 46, 14-22.
Xiao, Q., and J. Sun, 2007: Multiple Radar Data Assimilation and Short- range QPF of a Squall
Line observed during IHOP_2002. Mon. Wea. Rev., 135, 3381-3404.
Sun, J., and Y. Zhang, 2008: Assimilation of multipule WSR_88D Radar observations and
prediction of a squall line observed during IHOP. Mon. Wea. Rev., 136, 2364-2388.
Xiao, Q., E. Lim, D-J. Won, J. Sun, W.-C. Lee, W.-J. Lee, J. Cho, Y.-H. Kuo, D. Barker, D.-K.
Lee, and H.-S. Lee, 2008: A successful collaboration between institutiona and operational
center: Realization of Doppler radar data assimilation with WRF 3D-Var in KMA
operational forecasting. Bull. Amer. Met. Soc., 89, 39-43.
Fast, D. J., R. K. Newman, K. J. Allwine, Q. Xu, P. Zhang, J. Copeland, J. Sun, 2008: An
evaluation of two NEXRAD wind retrieval methodologies and their use in atmospheric
dispersion models, J. Appl. Meteor., 47, 2351-2371.
Roberts, D. R., Frederic Fabry, Patrick C. Kennedy, Eric Nelson, James Wilson, Nancy Rehak,
Jason Fritz, V. Chandrasekar, John Braun, Juanzhen Sun, Scott Ellis, Steven Reising,
Timothy Crum, Lawrence Mooney, Bob Palmer, 2008: REFRACTT-2006: Real-time
Retrieval of High-Resolution, Low-Level Moisture Fields from Operational NEXRAD
and Research Radars. Bull. Amer. Met. Soc.. 89, 1535-1548.
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Sugimoto, S., N. A. Crook, J. Sun, Q. Xiao, and D. Barker, 2009: Assimilation of Doppler
RadarData with WRF 3DVAR: Evaluation of its Potential Benefits to
QuantitativePrecipitation Forecasting through Observing System Simulation
Experiments. Mon. Wea. Rev., 137, 4011-4029.
Pu, Z., X. Li, and J. Sun, 2009: Impact of the Airborne Doppler Radar Data on High Resolution
Numerical Simulation of Intensity Change of Hurricane Dennis. J. Atmos. Sci., 66, 33513365.
Fabry, F., and J. Sun, 2010: How long should and what data be assimilated for the mesoscale
forecasting of convection and why? Part I: On the propagation of initial condition errors
and its implications for data assimilation. Mon Wea Rev., 138, 242-255.
Lim, E., and J. Sun, 2010: A Four-dimensional Velocity Dealiasing Technique Using Rapidly
Updated Analysis in a Variational Doppler Radar Data Assimilation System. J. Atmos.
Ocean. Tech., 27, 1140-1152.
Sun, J., M. Chen, and Y. Wang, 2010: A frequent-updating analysis system based on radar,
surface, and mesoscale model data for the Beijing 2008 forecast demonstration project.
Wea. Forecasting., 25, 1715-1735.
Tai, S-L, Y-C Liou, J. Sun, S-F Zhang, and M-C Kuo, 2011: Precipitation forecasting using
Doppler radar data, a cloud model with adjoint, and Weather Research and Forecasting
model –real case studies during SoWMEX in Taiwan. Wea. Forecasting, 26, 975-992.
Sun, J., S. Trier, Q. Xiao, M. Weisman, H. Wang, Z. Ying, Y. Zhang, and Mei Xu, 2012: 0-12
hour warm-season precipitation forecast over the central United States: sensitivity to
model initialization. Wea. Forecasting, 27, 832-855.
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