University Corporation for Atmospheric Research



CURRICULUM VITAE

Juanzhen Sun

PERSONAL

Home Address: Work Address:

1142 Crestmoor Dr. National Center for Atmospheric Research

Boulder, CO 80303 P.O.Box 3000

(303)-543-1189 Boulder, CO 80307-3000

(303)-497-8957

DOB: March 12, 1961 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

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 Member, AMS Radar Meteorology Committee

2000-2006 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, 1075-1091.

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.

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.

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, 3351-3365.

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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