Editorial Type:
Article
Article Type:
Research Article

Sensitivity of Hurricane Intensity Forecast to Convective Momentum Transport Parameterization

Jongil Han RS Information Systems, Inc., and Environmental Prediction Modeling Center, National Centers for Environmental Prediction, Camp Springs, Maryland

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Hua-Lu Pan Environmental Prediction Modeling Center, National Centers for Environmental Prediction, Camp Springs, Maryland

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Print Publication:
01 Feb 2006
DOI:
https://doi.org/10.1175/MWR3090.1
Page(s):
664–674
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Abstract

A parameterization of the convection-induced pressure gradient force (PGF) in convective momentum transport (CMT) is tested for hurricane intensity forecasting using NCEP's operational Global Forecast System (GFS) and its nested Regional Spectral Model (RSM). In the parameterization the PGF is assumed to be proportional to the product of the cloud mass flux and vertical wind shear. Compared to control forecasts using the present operational GFS and RSM where the PGF effect in CMT is taken into account empirically, the new PGF parameterization helps increase hurricane intensity by reducing the vertical momentum exchange, giving rise to a closer comparison to the observations. In addition, the new PGF parameterization forecasts not only show more realistically organized precipitation patterns with enhanced hurricane intensity but also reduce the forecast track error. Nevertheless, the model forecasts with the new PGF parameterization still largely underpredict the observed intensity. One of the many possible reasons for the large underprediction may be the absence of hurricane initialization in the models.

Corresponding author address: Jongil Han, 5200 Auth Road, WWB Rm. 207, Camp Springs, MD 20746. Email: Jongil.Han@noaa.gov

Abstract

A parameterization of the convection-induced pressure gradient force (PGF) in convective momentum transport (CMT) is tested for hurricane intensity forecasting using NCEP's operational Global Forecast System (GFS) and its nested Regional Spectral Model (RSM). In the parameterization the PGF is assumed to be proportional to the product of the cloud mass flux and vertical wind shear. Compared to control forecasts using the present operational GFS and RSM where the PGF effect in CMT is taken into account empirically, the new PGF parameterization helps increase hurricane intensity by reducing the vertical momentum exchange, giving rise to a closer comparison to the observations. In addition, the new PGF parameterization forecasts not only show more realistically organized precipitation patterns with enhanced hurricane intensity but also reduce the forecast track error. Nevertheless, the model forecasts with the new PGF parameterization still largely underpredict the observed intensity. One of the many possible reasons for the large underprediction may be the absence of hurricane initialization in the models.

Corresponding author address: Jongil Han, 5200 Auth Road, WWB Rm. 207, Camp Springs, MD 20746. Email: Jongil.Han@noaa.gov

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  • Deardorff, J. W., 1972: Numerical investigation of neutral and unstable planetary boundary layers. J. Atmos. Sci, 29 , 91–115.

  • Frank, W. M., and E. A. Ritchie, 2001: Effects of vertical wind shear on the intensity and structure of numerically simulated hurricanes. Mon. Wea. Rev, 129 , 2249–2269.

    • Search Google Scholar
    • Export Citation

  • Gregory, D., R. Kershaw, and P. M. Innes, 1997: Parameterization of momentum transport by convection. II: Tests in single-column and general circulation models. Quart. J. Roy. Meteor. Soc, 123 , 1153–1183.

    • Search Google Scholar
    • Export Citation

  • Hong, S-Y., 1999: New global orography data sets. NCEP Office Note 424, 22 pp.

  • Hou, Y-T., S. Moorthi, and K. Campana, 2002: Parameterization of solar radiation transfer in the NCEP models. NCEP Office Note 441, 46 pp.

  • Jarvinen, B. R., C. J. Neumann, and M. A. S. Davis, 1984: A tropical cyclone data tape for the North Atlantic Basin, 1886–1983: Contents, limitations, and uses. NOAA Tech. Memo. NWS NHC 22, Miami, Florida, 21 pp.

  • Juang, H-M. H., and M. Kanamitsu, 1994: The NMC nested regional spectral model. Mon. Wea. Rev, 122 , 3–26.

  • Krishnamurti, T. N., J. Sanjay, T. S. V. Kumar, A. J. O'Shay, and R. J. Pasch, 2005: On the weakening of Hurricane Lili, October 2002. Tellus A, 57 .65–83, doi:10.1111/j.1600-0870.2005.00084.x.

    • Search Google Scholar
    • Export Citation

  • LeMone, M. A., 1983: Momentum transport by a line of cumulonimbus. J. Atmos. Sci, 40 , 1815–1834.

  • LeMone, M. A., G. M. Barnes, and E. J. Zipser, 1984: Momentum flux by lines of cumulonimbus over tropical oceans. J. Atmos. Sci, 41 , 1914–1932.

    • Search Google Scholar
    • Export Citation

  • LeMone, M. A., G. M. Barnes, J. C. Fankhauser, and L. F. Tarleton, 1988a: Perturbation pressure fields measured by aircraft around the cloud-base updraft of deep convective clouds. Mon. Wea. Rev, 116 , 313–327.

    • Search Google Scholar
    • Export Citation

  • LeMone, M. A., L. F. Tarleton, and G. M. Barnes, 1988b: Perturbation pressure at the base of cumulus clouds in low shear. Mon. Wea. Rev, 116 , 2062–2068.

    • Search Google Scholar
    • Export Citation

  • Mlawer, E. J., S. J. Taubman, P. D. Brown, M. J. Iacono, and S. A. Clough, 1997: RRTM, a validated correlated-k model for the longwave. J. Geophys. Res, 102 , 16663–16682.

    • Search Google Scholar
    • Export Citation

  • Moorthi, S., H-L. Pan, and P. Caplan, 2001: Changes to the 2001 NCEP operational MRF/AVN global analysis/forecast system. NWS Technical Procedures Bulletin 484, 14 pp.

  • Pan, H-L., and W-S. Wu, 1995: Implementing a mass flux convective parameterization package for the NMC medium-range forecast model. NMC Office Note 409, 40 pp.

  • Rotunno, R., and J. B. Klemp, 1982: The influence of the shear-induced pressure gradient on thunderstorm motion. Mon. Wea. Rev, 110 , 136–151.

    • Search Google Scholar
    • Export Citation

  • Wu, X., and M. Yanai, 1994: Effects of vertical wind shear on the cumulus transport of momentum: Observations and parameterization. J. Atmos. Sci, 51 , 1640–1660.

    • Search Google Scholar
    • Export Citation

  • Wu, X., X-Z. Liang, and G. J. Zhang, 2003: Seasonal migration of ITCZ precipitation across the equator: Why can't GCMs simulate it? Geophys. Res. Lett, 30 .1824, doi:10.1029/2003GL017198.

    • Search Google Scholar
    • Export Citation

  • Zhang, G. J., and H-R. Cho, 1991a: Parameterization of the vertical transport of momentum by cumulus clouds. Part I: Theory. J. Atmos. Sci, 48 , 1483–1492.

    • Search Google Scholar
    • Export Citation

  • Zhang, G. J., and H-R. Cho, 1991b: Parameterization of the vertical transport of momentum by cumulus clouds. Part II: Application. J. Atmos. Sci, 48 , 2448–2460.

    • Search Google Scholar
    • Export Citation

  • Zhang, G. J., and X. Wu, 2003: Convective momentum transport and perturbation pressure field from a cloud-resolving model simulation. J. Atmos. Sci, 60 , 1120–1139.

    • Search Google Scholar
    • Export Citation
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