• Browning, K. A., , and Wexler R. , 1968: The determination of kinematic properties of a wind field using Doppler radar. J. Appl. Meteor., 7 , 105113.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Browning, K. A., , Roberts N. M. , , and Illingworth A. J. , 1997: Mesoscale analysis of the activation of a cold front during cyclogenesis. Quart. J. Roy. Meteor. Soc., 123 , 23492375.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Bluestein, H. B., 1986: Fronts and jet streaks: A theoretical perspective. Mesoscale Meteorology and Forecasting. P. S. Ray, Ed., Amer. Meteor. Soc., 173–215.

    • Search Google Scholar
    • Export Citation
  • Dou, X. K., , Scialom G. , , and Lemaître Y. , 1996: MANDOP analysis and airborne Doppler radar for mesoscale studies. Quart. J. Roy. Meteor. Soc., 122 , 12311261.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Frush, C. L., , Hildebrand P. H. , , and Walther C. A. , 1986: The NCAR airborne Doppler radar. Part II: System design considerations. Preprints, 23d Radar Meteorology Conf., Snowmass, CO, Amer. Meteor. Soc., 151–154.

    • Search Google Scholar
    • Export Citation
  • Heymsfield, A. J., 1978: The characteristics of graupel particles in northeastern Colorado cumulus congestus clouds. J. Atmos. Sci., 35 , 284295.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Hildebrand, P. H., , and Mueller C. K. , 1985: Evaluation of meteorological airborne Doppler radar. Part I: Dual-Doppler analyses of air motions. J. Atmos. Oceanic Technol., 2 , 362380.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Hildebrand, P. H., , Walther C. A. , , Frush C. L. , , Testud J. , , and Baudin F. , 1994: The ELDORA/ASTRAIA airborne Doppler radar: Goals, design, and first field tests. Proc. IEEE, 82 , 18731890.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Joly, A., ,and Coauthors. 1997: The Fronts and Atlantic Storm-Track Experiment (FASTEX): Scientific objectives and experimental design. Bull. Amer. Meteor. Soc., 78 , 19171940.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Jorgensen, D., , Bessemoulin P. , , Clough S. , , and Moore J. , 1996: Fronts and Atlantic Storm Track Experiment (FASTEX) operation plan. Tech. Rep. 5, FASTEX Project Office, Centre National de Recherches Météorologiques, 164 pp.

    • Search Google Scholar
    • Export Citation
  • Jorgensen, D., , Hildebrand P. H. , , and Frush C. L. , 1983: Feasibility test of an airborne pulse Doppler radar. J. Climate Appl. Meteor., 22 , 744757.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Lee, W. C., , Dodge P. , , Marks F. D. , , and Hildebrand P. H. , 1994: Mapping of airborne Doppler radar data. J. Atmos. Oceanic Technol., 11 , 572578.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Lemaître, Y., , Protat A. , , and Bouniol D. , 1999: Pacific and Atlantic “bomblike” deepenings in mature phase: A comparative study. Quart. J. Roy. Meteor. Soc., 125 , 35133534.

    • Search Google Scholar
    • Export Citation
  • Locatelli, J. D., , and Hobbs P. V. , 1974: Fall speeds and masses of solid precipitation particles. J. Geophys. Res., 79 , 21852197.

  • Mapes, B. E., , and Houze R. A. , 1995: Diabatic divergence profiles in western Pacific mesoscale convective systems. J. Atmos. Sci., 52 , 18071828.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Matejka, T. J., , and Srivastava R. C. , 1991: An improved version of the extended velocity–azimuth display analysis of single-Doppler radar data. J. Atmos. Oceanic Technol., 8 , 453466.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Protat, A., , Lemaître Y. , , and Scialom G. , 1997: Retrieval of kinematic fields using a single-beam airborne Doppler radar performing circular trajectories. J. Atmos. Oceanic Technol., 14 , 769791.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Scialom, G., , and Testud J. , 1986: Retrieval of horizontal wind field and mesoscale vertical vorticity in stratiform precipitation by conical scannings with two Doppler radars. J. Atmos. Oceanic Technol., 3 , 693703.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Scialom, G., , and Lemaître Y. , 1990: A new analysis for the retrieval of three-dimensional mesoscale wind fields from multiple Doppler radar. J. Atmos. Oceanic Technol., 7 , 640665.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Scialom, G., , and Lemaître Y. , 1994: QVAD: A method to obtain quadratic winds from conical scans by a Doppler weather radar network. J. Atmos. Oceanic Technol., 11 , 909926.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Srivastava, R. C., , Matejka T. J. , , and Lorello T. J. , 1986: Doppler radar study of the trailing anvil region associated with a squall line. J. Atmos. Sci., 43 , 356377.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Testud, J., , Breger G. , , Amayenc P. , , Chong M. , , Nutten B. , , and Sauvaget A. , 1980: A Doppler radar observation of a cold front: Three dimensional air circulation, related precipitation system and associated wavelike motions. J. Atmos. Sci., 37 , 7898.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Testud, J., , Hildebrand P. H. , , and Lee W. C. , 1995: A procedure to correct airborne Doppler radar data for navigation errors, using the echo returned from the earth’s surface. J. Atmos. Oceanic Technol., 12 , 800820.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Webster, P. J., , and Lucas R. , 1992: The Coupled Ocean–Atmosphere Response Experiment. Bull. Amer. Meteor. Soc., 73 , 13771415.

    • Crossref
    • Search Google Scholar
    • Export Citation
All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 91 91 0
PDF Downloads 0 0 0

Retrieval of Kinematic Fields from Dual-Beam Airborne Radar Data Gathered in Circular Trajectories during the FASTEX Experiment

View More View Less
  • 1 Centre d’étude des Environnements Terrestre et Planétaires, Velizy, France
© Get Permissions
Restricted access

Abstract

The present paper describes the vertical structure of the wind field obtained by analysis of “purls,” that is, circular trajectories regularly performed by airborne dual-beam Doppler radars within the FASTEX frontal cyclones. Kinematic information on these systems are obtained using a new analysis scheme named DAVAD (Dual-Beam Antenna Velocity Azimuth Display). Using this scheme, it is possible to obtain the mesoscale wind field and its first-order derivatives, that is, the horizontal divergence (thus the vertical velocity), the stretching and shearing deformations, and the vertical component of vorticity. A unique advantage of this analysis is that it also provides a direct estimate of the terminal fall velocity of the hydrometeors. All these parameters are crucial for validation and initialization of mesoscale and large-scale models. The capabilities of this method and the best conditions for its application are assessed through simulations. Finally, an example of application of the scheme on the secondary low observed during the Fronts and Atlantic Storm Track Experiment (FASTEX) Intensive Observation Period (IOP) 12 is discussed. Results of purl processing using DAVAD are being included in the FASTEX database.

Corresponding author address: G. Scialom, CETP-CNRS-UVSQ 10-12, Avenue de l’Europe, 78140 Vélizy, France. Email: scialom@cetp.ipsl.fr

Abstract

The present paper describes the vertical structure of the wind field obtained by analysis of “purls,” that is, circular trajectories regularly performed by airborne dual-beam Doppler radars within the FASTEX frontal cyclones. Kinematic information on these systems are obtained using a new analysis scheme named DAVAD (Dual-Beam Antenna Velocity Azimuth Display). Using this scheme, it is possible to obtain the mesoscale wind field and its first-order derivatives, that is, the horizontal divergence (thus the vertical velocity), the stretching and shearing deformations, and the vertical component of vorticity. A unique advantage of this analysis is that it also provides a direct estimate of the terminal fall velocity of the hydrometeors. All these parameters are crucial for validation and initialization of mesoscale and large-scale models. The capabilities of this method and the best conditions for its application are assessed through simulations. Finally, an example of application of the scheme on the secondary low observed during the Fronts and Atlantic Storm Track Experiment (FASTEX) Intensive Observation Period (IOP) 12 is discussed. Results of purl processing using DAVAD are being included in the FASTEX database.

Corresponding author address: G. Scialom, CETP-CNRS-UVSQ 10-12, Avenue de l’Europe, 78140 Vélizy, France. Email: scialom@cetp.ipsl.fr

Save