Hans Xiang-Yu Huang

Ph.D., Senior Scientist
Meteorological Research Division
Danish Meteorological Institute
Lyngbyvej 100,DK-2100 Copenhagen ō
Phone: +45 39 15 74 23 FAX: +45 39 15 74 60
E-mail: [email protected]


Research interests

  • Variational data assimilation.
  • Observing systems.
  • Initialization and noise control for NWP systems.
  • Numerical methods.
  • Moist convection and cloud parameterization.

  • Education
    Jan 1984 - May 1988: Graduate study, Department of Meteorology, Stockholm University, Stockholm, Sweden. Ph.D. May 1988.
    Sept. 1983 - Jan 1984: Intensive Swedish course, Beijing institute of foreign languages, Beijing, China.
    Feb. 1983 - July 1983: Graduate study, Department of Geophysics, Peking University, China.
    Sept. 1982 - Jan 1983: Intensive English course, Guangzhou institute of foreign languages, Guangzhou, China.
    Oct. 1978 - July 1982: Undergraduate study, Department of Geophysics, Peking University, Beijing, China. B.Sc. July 1982.

    Work experience
    Feb. 1992 - : Senior scientist ('Seniorforsker'), Danish Meteorological Institute, Denmark.
    June 1995 - June 1998 : Guest professor, Beijing Meteorological College, Beijing, China.
    July 1988 - Jan 1992 : Research fellow ('Forskare'), Department of Meteorology, University of Stockholm, Sweden.
    July 1986 - June 1988 : Teaching assistant ('Doktorandtjšnst'), Department of Meteorology, University of Stockholm, Sweden.
    July 1985 - June 1986 : Teaching assistant ('Doktorand'), Department of Meteorology, University of Stockholm, Sweden.

    Reviewed publications

    Gustafsson, N., Berre, L., HŲrnquist, S., Huang, X.-Y., Lindskog, M., Navascues, B., Mogensen, K.S., Thorsteinsson, S. 2000. Three-dimensional variational data assimilation for a limited area model. Part I: General formulation and the background error constraint. Tellus, in press.

    Lindskog, M., Gustafsson, N., Navascues, B., Mogensen, K.S., Huang, X.-Y., Yang, X., Andrae, U., Berre, L., Thorsteinsson, S., Rantakokko, J. 2000. Three-dimensional variational data assimilation for a limited area model. Part II: Observation handling and assimilation experiments. Tellus, in press.

    Huang, X.-Y. 2000. Variational analysis using spatial filters. Mon. Wea. Rev. 128, 2588-2600.

    Amstrup, B. and Huang, X.-Y. 1999. Impact of the additional FASTEX radiosonde observations on the HIRLAM data assimilation and forecasting system. Q. J. R. Meteor. Soc. 125, 3359-3374.

    Huang, X.-Y. 1999. A generalization of using an adjoint model in intermittent data assimilation systems. Mon. Wea. Rev. 127,766-787.

    Yu, X.-D., Huang, X.-Y., Laursen, L., Rasmussen, E. 1997. Application of the HIRLAM system in China - torrential rain forecast experiments in Yangtze river valley. Quarterly Journal of Applied Meteorology, 8, 498-502.

    Yu, X.-D., Huang, X.-Y., Laursen, L., Rasmussen, E. 1997. On the sensitivity of precipitation forecasts to the moist physics and the horizontal resolution of numerical model. Acta Meteorologica Sinica, 11, 432-445.

    Huang, X.-Y., Gustafsson, N. and Kšllťn, E. 1997. Using an adjoint model to improve an optimum interpolation based data assimilation system. Tellus 49A, 161-176.

    Gustafsson, N. and Huang, X.-Y. 1996. Sensitivity experiments with the spectral HIRLAM and its adjoint. Tellus 48A, 501-517.

    Huang, X.-Y. 1996. Initialization of cloud water content in a data assimilation system. Mon. Wea. Rev. 124, 478-486.

    Huang, X.-Y., Cederskov, A., and Kšllťn, E. 1994. A comparison between digital filtering initialization and nonlinear normal mode initialization in a data assimilation system. Mon. Wea. Rev. 122, 1001-1015.

    Lynch, P. and Huang, X.-Y. 1994. Diabatic initialization using recursive filters. Tellus 46A, 583-597.

    Huang, X.-Y. and Sundqvist, H. 1993. Initialization of cloud water content and cloud cover for numerical prediction models. Mon. Wea. Rev. 121, 2719-2726.

    Huang, X.-Y. and Lynch, P. 1993. Diabatic digital filter initialization: Application to the HIRLAM model. Mon. Wea. Rev. 121, 589-603.

    Lynch. P and Huang, X.-Y. 1992. Initialization of the HIRLAM model using a Digital Filter. Mon. Wea. Rev. 120,1019-1034.

    Huang, X.-Y. 1990. The organization of moist convection by internal gravity waves. Tellus 42A, 270-285.

    Kšllťn, E. and Huang, X.-Y. 1988. The influence of isolated observations on short range numerical weather forecasts. Tellus 40A, 324-336.

    Huang, X.-Y. 1988. On the hysteretic behaviour of moist convection. Tellus 40A, 237- 247.

    Kšllťn, E. and Huang, X.-Y. 1987. A simple model for large-scale thermohaline convection. Dyn. Atmos. Oceans, 11, 153-173.

    Huang, X.-Y. and Kšllťn, E. 1986. A low-order model for moist convection. Tellus 38A, 381-396.

    Huang, X.-Y. and Kšllťn, E. 1986. Comments on ``A note on CISK in polar air masses". Tellus 38A, 378-379.



    Other selected publications
    Huang, X.-Y. and Yang, X. 2001. A new implementation of digital filtering initialization schemes for HIRLAM. Manuscript in preparation.

    Sattler, K. and Huang, X.-Y. 2000. Structure function characteristics for 2 meter temperature and relative humidity in different horizontal resolution. Scientific Report 00-17, Danish Meteorological Institute, 30pp.

    Mogensen, K.S., JÝrgensen, J.U., Amstrup, B., Yang, X. and Huang, X.-Y. 2000. Towards an operational implementation of HIRLAM 3D-VAR at DMI. Scientific Report 00-16, Danish Meteorological Institute, 42pp.

    Vedel, H., Mogensen, K.S. and Huang, X.-Y. 2000. Calculation of zenith delays from meteorological data, comparison of NWP model, radiosonde and GPS delays. Physics and Chemistry of the Earth, submitted.

    Amstrup, B., Mogensen, K.S. and Huang, X.-Y. 2000. Use of GPS observations in an optimum interpolation based data assimilation system. Scientific Report 00-14, Danish Meteorological Institute, 20pp.

    Amstrup, B. and Huang, X.-Y. 2000. Recent observing system experiments using the OI-based HIRLAM forecasting system. The second CGC-WMO workshop on the impact of observing systems on numerical weather prediction. 6-8 March 2000, Toulouse, France.

    Huang, X.-Y., Gustafsson, N. and Robertson, L. 1999. OBJECTIVE ANALYSIS. Numerical exercise instructions.

    Mogensen, K. S. and Huang, X.-Y. 1998. Variational parameter estimation with the Lorenz model. HIRLAM Technical Report No. 33, 29 pp.

    Huang, X.-Y. 1998. An overview of the HIRLAM simplified 4DVAR. In Preprints, HIRLAM Workshop on variational analysis in limited area models, 23-25 February 1998, Toulouse, France.

    Huang, X.-Y. 1997. Observing system experiments performed with the HIRLAM forecasting system. CGC-WMO workshop on the impact of observing systems on numerical forecasts. 7-9 April 1997, WMO, Geneva, Switzerland.

    Huang, X.-Y. 1996. Horizontal diffusion and filtering in a mesoscale numerical weather prediction model. Scientific report 96-5, Danish Meteorological Institute.

    Huang, X.-Y. and Yang, X. 1996. Variational data assimilation with the Lorenz model. HIRLAM Technical Report No. 26, 42 pp.

    Laursen, L., Huang, X.-Y. and Nielsen, N.W. 1995. On the application of the HIRLAM system in Denmark, Greenland and China. In preprints, WMO symposium on limited area modelling, October 1995, Beijing, China. 311-315.

    Gustafsson, N and Huang, X.-Y. 1994. Experiments with re-analysis cycles and analysis "cool starts". HIRLAM Newsletter No. 17, 43-46.

    Huang, X.-Y. 1991. Grouping of clouds and internal gravity waves in a non-hydrostatic model of moist convection. University of Stockholm, Department of Meteorology/International Meteorological Institute in Stockholm, Report DM-55, pp 44.

    KristjŠnsson, J. E. and Huang, X.-Y. 1990. Implementation of a consistent scheme for condensation and clouds in HIRLAM. HIRLAM Technical Report No. 7.

    Kšllťn, E. and Huang, X.-Y. 1988. Perturbation sensitivity on the cyclone scale in the ECMWF model. Preprint volume for Palmen memorial symposium on extratropical cyclones, 29 Aug.- 2 Sept. 1988, Helsinki, Finland, 314-317.

    Huang, X.-Y. 1988. Nonlinear effects in models of convection. Ph.D. thesis, University of Stockholm.



    National and international projects

    HIRLAM - HIgh Resolution Limited-Area Modelling. International research project. Participating countries: Denmark, Finland, Iceland, Ireland, Netherlands, Norway and Sweden. 1985-

    GODANS - GPS satellite Occultation Data Assimilation for Numerical weather prediction Systems. Danish Research Council project. 1998-2001.

    CLIMAP - CLImate and environment Monitoring with GPS Atmospheric Profiling. EU project. 1998-2000.

    MAGIC - Meteorological Applications of GPS Integrated water vapor measurements in the Western Mediterranean. EU project. 1998-2001.

    CASE - Impact of an atmospheric profiling mission on NWP. ESA project. 1998-2000.



    Other professional duties and experiences
    SEG/COSNA- member of the Scientific Evaluation Group of the Composite Observing System for the North Atlantic, since 1996.

    E-SAT/EUCOS - member of the EUCOS (EUMETNET Composite Observing System) Scientific Advisory Team, since 1999.

    COST 717 - Danish representative in the action, "Use of radar observation in hydrological and NWP models", 1999-2003.

    Teaching - Data assimilation, undergraduate course, Danish Meteorological Institute.

    Reviewer for the international scientific journals Tellus, Monthly Weather Review, Meteorological Applications.


    Last update: 16 May 2000