Los Alamos National Laboratory

Los Alamos National Laboratory

Delivering science and technology to protect our nation and promote world stability
Find Expertise logo

Profile Pages

View homepages for scientists and researchers. Explore potential collaborations and project opportunities. Search the extensive range of capabilities by keyword to quickly find who and what you are looking for.

Young-Joon Kim

YJ Kim

Email
Phone (301) 427-9387

Capabilities

  • Computational Physics and Applied Mathematics
  • Numerical modeling
  • Computational fluid dynamics (CFD)
  • Partial differential equations
  • Applied Math
  • Statistics
  • Adaptive mesh refinement (AMR)
  • Computer and Computational Sciences
  • High performance computing
  • Earth and Space Sciences
  • Hydrology
  • Space-borne instrumentation
  • Upper atmosphere
  • Remote sensing
  • Atmospheric chemistry
  • Climate modeling
  • Aerosols
  • Oceanography
  • Carbon fluxes
  • Science of Signatures - Remote and Standoff Sensing
  • Remote sensing
  • High performance computing
  • Aerosols
  • Solar radiation
  • Clouds
  • Weapons Science and Engineering
  • Advanced physics models
  • Computational fluid dynamics (CFD)
  • Large-scale hydrodynamics simulations

Expertise

Atmospheric Physics Modeling

  • Developed new orographic (and convective) gravity-wave drag parameterizations for atmospheric models (Journal References: 13,14,17,22,23)
    • Operationally used for NCEP’s GFS, GRIMs at Korea Air Force, and UCLA GCM
    • Experimentally used for NRL’s NOGAPS/NAVGEM, WRF, and NOAA’s FIM/NIM
  • Developed, refined, implemented and/or evaluated parameterizations of various atmospheric physics for atmospheric models
    • Orographic Processes (Journal References: 3, 4, 5, 7, 9, 11, 14, 16, 18, 22, 23, 24)
    • Radiative Processes (Journal References: 2, 5, 21)
    • Cloud Processes/Effects (Journal References: 10, 13, 17)
    • Boundary Layer Processes (Journal References: 7, 19)
    • Chemical Processes (Journal References: 15, 21)
    • Oscillation/Wave Dynamics/Physics (Journal References: 1, 8, 20)
    • Middle Atmospheric Dynamics/Physics (Journal References: 3, 4, 11, 12, 15)

 

Mesoscale (Explicit) Atmospheric Modeling and Simulation/Forecast

  • Constructed a new mesoscale mountain-wave model (Journal Reference: 23)
    • Derived 2-dimensional nonlinear anelastic nonhydrostatic system of equations
    • Developed a second-order prognostic turbulence parameterization scheme
    • Validate orographic gravity-wave drag parameterization schemes
  • Developed a new efficient non-reflective upper-boundary sponge layer (Journal Reference: 24)
    • Based on Newtonian cooling and Rayleigh friction formulations applied to each waves in spectral space transformed from physical space
    • Prevents artificial reflection of vertically propagating gravity waves
    • Applied to multiple mountain-wave models
  • Performed extensive explicit simulations of gravity waves and clouds using COAMPS® (Journal References: 13, 14)

 

Global Atmospheric Modeling (Climate Simulation & Weather Forecast)

  • Climate Simulation (Journal References: 5, 7, 12, 17, 20, 21, 22)
    • Developed, refined, implemented and validated various components of global climate simulation models such as those at UCLA, CSU, LLNL, CCSR, YONU, NCEP and NRL
  • Weather Forecast (Journal References: 1, 2, 3, 6, 9, 13, 16)
    • Developed, refined, implemented and validated various components of operational global weather forecast models including NOGAPS of NRL (the forecast systems for the DoD), GFS of NCEP and GRIMs of Yonsei Univ., etc.
    • Laid out plans to develop a brand-new NWP model, KIAPS NWP Model, based on spectral element method and cubed-sphere grid
  • Numerical Methods/Dynamics (Journal References: 8, 24)
    • Constructed a new full-physics global atmospheric model, NSEAM, the next generation atmospheric model for the US Navy, by modifying a new dynamical core based on spectral element methods and coupling physics parameterizations, and also developed a new mountain-wave model

 

Atmospheric Data Processing and Assimilation

  • Data Retrieval and Processing (Journal Reference: 19, & Technical Reports)
    • Improved algorithms for processing satellite microwave backscattering measurements for NASA/JPL scatterometers such as QuikSCAT and SeaWinds
    • Developed a new physical-model-based, field-wise and self-contained algorithm to remove the ambiguities in sea surface wind direction derived from NASA scatterometer measurements using atmospheric boundary layer models
  • Data Assimilation (Journal References: 3, 6)
    • Developed improved procedures for satellite data bias correction / assimilation system for the US Navy; NAVDAS and NAVDAS-AR
    • Developed improved satellite radiance quality control algorithms through more intelligent data outlier check algorithms, and performed various operational tests with NOGAPS

Education

PhD (Atmospheric Sciences), UCLA, 1992

MS (Atmospheric Sciences), UCLA, 1988

BS (Astronomy and Meteorology & Physics), Yonsei University, Seoul, Korea, 1985

 

LANL Positions

Guest Scientist (September 2016- ), Global Security Program
Scientist 4 (2014-2016), EES
Acting Deputy Group Leader, EES-16 (January-June 2015)
Applied Terrestrial, Energy, and Atmospheric Modeling (ATEAM)
Formerly, Atmosphere & Weapons Phenomenology (AWP) Team
Computational Earth Science Group (EES-16)
Earth and Environmental Sciences Division
 

Current Position

Branch Chief (9/2016-), Analysis and Nowcast Branch (ANB), Analysis and Mission Support Division, Analyze, Forecast, and Support Office (AFSO), National Weather Service (NWS) Headquarters, National Oceanic and Atmospheric Administration (NOAA), Silver Spring, MD
 

Previous Positions

Director (2012-2013), Korea Institute of Atmospheric Prediction Systems (kiaps.org)

Meteorologist (2001-2012) / UCAR Visiting Scientist (2000-2001), Global Modeling Section, Atmospheric Dynamics and Prediction Branch, Marine Meteorology Division, Naval Research Laboratory (nrlmry.navy.mil)

Engineering Staff (1997-2000), QuikSCAT/SeaWinds Algorithm Development Group & Ionospheric and Atmospheric Remote Sensing Group, Jet Propulsion Laboratory (jpl.nasa.gov)

Assistant Research Faculty (1996–1999), Department of Atmospheric Sciences, UCLA (atmos.ucla.edu)

Research Associate & Postgraduate Researcher (1992-1996), Department of Atmospheric Sciences, UCLA

Republic of Korea Army (1990-1991)

Research Assistant (1986-1990, 1991-1992), Department of Atmospheric Sciences, UCLA

 

Professional Societies

Member (2001–present), American Geophysical Union (AGU; agu.org)

Member (1991-present), Editor (1994) & Chairperson (2002-2004), Korean Atmospheric Scientists In America (KASA; kasahome.org)

Member (1993–present), Korean Scientists & Engineers Association in America (KSEA; ksea.org)

Member (1988–present), American Meteorological Society (AMS; ametsoc.org)

Member (1981–1986, 2012–present), Korean Meteorological Society (KMS; komes.or.kr)


 

 

Awards

Appreciation Plaque, Korean Meteorological Society, 2012

12 Consecutive Research Contribution Awards, Naval Research Laboratory, 2001~2012

Meritorious Unit Commendation Citation Award, US Navy, 2007

Group Achievement Award, NASA/JPL, 2000

Scholarship, Korean-American Scholarship Fund in Southern California, Inc., 1989

Graduation with highest honor, Yonsei University, Korea, 1985

Excellency award, National college thesis contest, Chosun University, Gwangju, Korea 1984

 

Publications

Summary

Over 100 publications including 24 SCI journal papers, over 10 technical notes, about 10 newspaper and magazine articles, and over 75 conference presentations/proceedings including several invited talks

Selected Referred Jouranl Articles

  1. Flatau, M., and Y. -J. Kim, 2013: Interaction between the MJO and polar circulations. J. Clim., 26, 3562-3574.
  2. Liu, M., Y. –J. Kim, and A. Zhao, 2012: Numerical experiments of an advanced radiative transfer model in the US Navy Operational Global Atmospheric Prediction System. J. Appl. Meteor., 554–570. doi: http://dx.doi.org/10.1175/JAMC-D-11-018.1.
  3. Kim, Y. -J., W. F. Campbell, and B. Ruston, 2011: Hindcasting the January 2009 Arctic Sudden Stratospheric Warming with unified parameterization of orographic drag in NOGAPS. Part II: Short-range data-assimilated forecast and the impact of calibrated radiance bias correction. Weather & Forecasting, 26, 993–1007.
  4. Kim, Y. -J., and M. Flatau, 2010: Hindcasting the January 2009 Arctic Sudden Stratospheric Warming and its Influence on the Arctic Oscillation with unified parameterization of orographic drag in NOGAPS. Part I: Extended-range stand-alone forecast. Weather & Forecasting, 25, 1628-1644.
  5. Shin, H. –Y., S. –Y. Hong, J. Dudhia, and Y. –J. Kim, 2010: Orography-induced gravity wave drag parameterization in the global WRF: Implementation and sensitivity to short-wave radiation schemes. Advances in Meteorology, Volume 2010, Article ID 959014, doi:10.1155/2010/959014.
  6. Kim, Y. -J., W. F. Campbell and S. D. Swadley, 2010: Reduction of middle atmospheric forecast bias through improvement in satellite radiance quality control. Weather & Forecasting., 25, 681-700.
  7. Kim, Y. -J., and S. –Y. Hong, 2009: Interaction between the orography-induced gravity wave drag and boundary layer processes in a global atmospheric model. Geophys. Res. Lett., doi: 10.1029/2008GL037146.
  8. Kim, Y. -J., F. X. Giraldo, M. Flatau, C. -S. Liou and M. S. Peng, 2008: A sensitivity study of the Kelvin wave and the Madden-Julian Oscillation in aqua-planet simulations by the Naval Research Laboratory Spectral Element Atmospheric Model (NSEAM). J. Geophys. Res., 113, D20102, doi: 10.1029/2008JD009887.
  9. Hong, S. –Y., J. Choi, E. –C. Chang, H. Park and Y. –J. Kim, 2008: Lower Tropospheric enhancement of gravity wave drag in a global spectral atmospheric forecast model, Weather and Forecasting, 23, 523-531.
  10. Teixeira, J., and Y. –J. Kim, 2008: On a simple parameterization of convective cloud fraction, Asia-Pacific Journal of Atmospheric Sciences, 44, 191-199.
  11. Kim, Y. –J., 2007: Balance of drag between the middle and lower atmospheres in a global atmospheric forecast model, J. Geophys. Res., 112, D13104, doi:10.1029/2007JD008647.
  12. Allen, D. R., S. D. Eckermann, J. P. McCormack, L. Coy, G. L. Manney, T. F. Hogan, and Y. –J. Kim, 2006: NOGAPS-ALPHA Simulations of the 2002 Southern Hemisphere Stratospheric Major Warming. Mon. Wea. Rev., 134, 498-134.
  13. Kim, Y. -J., and H. –Y. Chun, 2005: A computationally-efficient nonstationary convective gravity-wave drag parameterization for global atmospheric prediction systems. Geophysical Research Letters, 32, No. 22, L22805, 10.1029/2005GL024572, 23 November 2005.
  14. Kim, Y. -J., and J. D. Doyle, 2005: Extension of an orographic drag parametrization scheme to incorporate orographic anisotropy and flow blocking, Quart. J. Roy. Meteor. Soc., 131, 1893-1921.
  15. McCormack, J. P., S. D. Eckermann, L. Coy, D. R. Allen, Y. –J. Kim, T. Hogan, B. Lawrence, A. Stevens, R. Bevilacqua, E. V. Browell, J. Burris, T. McGee, and C. R. Trepte, 2004: NOGAPS-ALPHA model simulations of stratospheric ozone during the SOLVE2 campaign, Atmos. Chem. Phys., 4, 2401-2423.
  16. Kim, Y. -J., and T. F. Hogan, 2004: Response of a global atmospheric forecast model to various drag parameterizations. Tellus, 56A, 472-484.
  17. Chun, H. –Y., I. –S. Song, J. –J. Baik, and Y. –J. Kim, 2004: Impact of a convectively forced gravity-wave drag parameterization in NCAR CCM3. J. Climate, 17, 3529-3546.
  18. Kim, Y. -J., S. D. Eckermann, H. –Y. Chun, 2003: An overview of the past, present and future of gravity-wave drag parameterization for numerical climate and weather prediction models. Atmosphere-Ocean, 41, 65-98.
  19. Kim, Y. -J., 2000: A physical-model-based, field-wise and self-contained algorithm for removing directional ambiguities of ocean surface winds retrieved from scatterometer measurements.  Geophysical Research Letters, 27, 2665-2668.
  20. Robertson, A. W., C. R. Mechoso and Y. -J. Kim, 2000: The influence of sea surface temperature anomalies on the North Atlantic Oscillation. J. Climate, 13, 122-138.
  21. Kim, Y. -J., J. D. Farrara, and C. R. Mechoso, 1998: Sensitivity of AGCM simulations to modifications in the ozone distribution and refinements in selected physical parameterizations. J. Meteor. Soc. of Japan, 76, 695-709.
  22. Kim, Y. -J., 1996: Representation of subgrid-scale orographic effects in a general circulation model: Part I. Impact on the dynamics of simulated January climate. J. Climate, 9, 2698-2717.
  23. Kim, Y. -J., and A. Arakawa, 1995: Improvement of orographic gravity-wave parameterization using a mesoscale gravity-wave model. J. Atmos. Sci., 52, 1875-1902.
  24. Kim, Y. -J., S. K. Kar and A. Arakawa, 1993: A nonreflecting upper-boundary condition for anelastic nonhydrostatic mesoscale gravity-wave models. Mon. Wea. Rev., 121, 1249-1261.