• Babin, S. M., 1996: Surface duct height distributions for Wallops Island, Virginia, 1995–1996. J. Appl. Meteor., 35, 8693.

  • Bean, B. R., and E. J. Dutton, 1968: Radio Meteorology. Dover, 435 pp.

  • Bech, J., D. H. Bebbington, B. Codiba, A. Sairouini, and J. Lorente, 1998: Evaluation of atmospheric anomalous propagation conditions: An application for weather radars. Remote Sensing for Agriculture, Ecosystems, and Hydrology, E. T. Engman, Ed., International Society for Optical Engineering (SPIE Proceedings, Vol. 3499), 111–113.

  • Bech, J., A. Sairouni, B. Codina, J. Lorente, and D. Bebbington, 2000: Weather radar anaprop conditions at a Mediterranean coastal site. Phys. Chem. Earth, 25, 829832.

    • Search Google Scholar
    • Export Citation
  • Bech, J., B. Codina, J. Lorente, and D. Bebbington, 2002: Monthly and daily variations of radar anomalous propagation conditions: How “normal” is normal propagation? Proc. Second European Conf. of Radar Meteorology, Vol. 1, Delft, Netherlands, ERAD, 35–39.

  • Brooks, I. M., A. K. Goroch, and D. P. Rogers, 1999: Observations of strong radar ducts over the Persian Gulf. J. Appl. Meteor., 38, 12931310.

    • Search Google Scholar
    • Export Citation
  • Burk, S. D., and W. T. Thompson, 1997: Mesoscale modeling of summertime refractive conditions in the Southern California Bight. J. Appl. Meteor., 36, 2231.

    • Search Google Scholar
    • Export Citation
  • Chang, P. L., and P. F. Lin, 2011: Radar anomalous propagation associated with foehn winds induced by Typhoon Krosa (2007). J. Appl. Meteor. Climatol., 50, 15271542.

    • Search Google Scholar
    • Export Citation
  • Chen, L., S.-H. Gao, S.-F. Kang, Y.-S. Zhang, and Z.-M. Wu, 2009: Statistical analysis on spatial-temporal features of atmospheric ducts over Chinese regional seas. Chin. J. Radio Sci., 24, 702708.

    • Search Google Scholar
    • Export Citation
  • Cheng, Y.-H., 2009: A study on atmospheric ducts over the sea retrieval with AMSR-E satellite data and its numerical simulation. Ph.D. dissertation, Chinese Academy of Sciences, 101 pp.

  • Cook, J., 1991: A sensitivity study of weather data inaccuracies on evaporation duct height algorithms. Radio Sci., 26, 731746.

  • Craig, K. H., and T. G. Hayton, 1995: Climatic mapping of refractivity parameters from radiosonde data. Proc. Conf. 567 on Propagation Assessment in Coastal Environments, Bremerhaven, Germany, AGARD-NATO, 43-1–43-14.

  • Dockery, G. D., 1988: Modeling electromagnetic wave propagation in the troposphere using the parabolic equation. IEEE Trans. Antennas Propag., 36, 14641470.

    • Search Google Scholar
    • Export Citation
  • Fornasiero, A., P. P. Alberoni, and J. Bech, 2006: Statistical analysis and modelling of weather radar beam propagation conditions in the Po Valley (Italy). Nat. Hazards Earth Syst. Sci., 6, 303314.

    • Search Google Scholar
    • Export Citation
  • Frederickson, P. A., J. T. Murphree, K. L. Twigg, and A. Barrios, 2008: A modern global evaporation duct climatology. Proc. 2008 Int. Conf. for Radar, Adelaide, SA, Australia, IEEE, 292–296.

  • Haack, T., C. Wang, S. Garrett, A. Glazer, J. Mailhot, and R. Marshall, 2010: Mesoscale modeling of boundary layer refractivity and atmospheric ducting. J. Appl. Meteor. Climatol., 49, 24372457.

    • Search Google Scholar
    • Export Citation
  • Helvey, R., J. Rosenthal, L. Eddington, P. Greiman, and C. Fisk, 1995: Use of satellite imagery and other indicators to assess variability and climatology of oceanic elevated ducts. Proc. AGARD/NATO Conf. on Propagation Assessment in Coastal Environments, Bremerhaven, Germany, North Atlantic Treaty Organization, 1–14.

  • Hsu, S. A., 1988: Coastal Meteorology. Academic Press, 260 pp.

  • Hu, X.-H., 2007: Analysis and numerical simulation of atmospheric duct affected by typical synoptic system. Ph.D. dissertation, Institution of Meteorology, PLA University of Science and Technology, 119 pp.

  • Liu, C.-G., Z.-W. Pan, and L. Guo, 1996: Statistical analysis of occurrence and characteristics of atmospheric ducts in China. Chin. J. Radio Sci., 11, 6066.

    • Search Google Scholar
    • Export Citation
  • Liu, C.-G., J.-Y. Huang, and C.-Y. Jiang, 2002: The occurrence of tropospheric ducts over the south-eastern coast of China. Chin. J. Radio Sci., 17, 509513.

    • Search Google Scholar
    • Export Citation
  • Liu, G.-Y., S.-H. Gao, Y.-M. Wang, and X.-E. Chen, 2012: Numerical simulation of atmosphere duct in typhoon subsidence area. J. Appl. Meteor. Sci., 23, 7788.

    • Search Google Scholar
    • Export Citation
  • Lopez, P., 2009: A 5-yr 40-km-resolution global climatology of superrefraction for ground-based weather radars. J. Appl. Meteor. Climatol., 48, 89110.

    • Search Google Scholar
    • Export Citation
  • Mentes, S. S., and Z. Kaymaz, 2007: Investigation of surface duct conditions over Istanbul, Turkey. J. Appl. Meteor. Climatol., 46, 318337.

    • Search Google Scholar
    • Export Citation
  • Mesnard, F., and H. Sauvageot, 2010: Climatology of anomalous propagation radar echoes in a coastal area. J. Appl. Meteor. Climatol., 49, 22852300.

    • Search Google Scholar
    • Export Citation
  • Newton, D. A., 2003: COAMPS modeled surface layer refractivity at the Roughness and Evaporation Duct experiment 2001. M.S. dissertation, Dept. of Meteorology, Naval Postgraduate School, 76 pp. [Available online at http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA417619.]

  • Pan, Z.-W., C.-G. Liu, and L. Guo, 1996: The prediction of ducts in south-east coast of China. Chin. J. Radio Sci., 11, 5864.

  • Peng, L.-R., and S.-J. Shu, 2010: Analysis on structure of Typhoon Longwang based on GPS dropsonde data. Chin. J. Trop. Meteor., 26, 1321.

    • Search Google Scholar
    • Export Citation
  • Rosenthal, J., and R. Helvey, 1979: Some synoptic considerations relative to the refractive effects guidebook (REG). Proc. Conf. on Atmospheric Effects Assessment, San Diego, CA, Naval Ocean Systems Center (NOSC Tech. Doc. 260).

  • Song, J.-J., Y. Wang, and L.-G. Wu, 2010: Trend discrepancies among three best track data sets of western North Pacific tropical cyclones. J. Geophys. Res., 115, D12128, doi:10.1029/2009JD013058.

    • Search Google Scholar
    • Export Citation
  • Steiner, M., and J. A. Smith, 2002: Use of three-dimensional reflectivity structure for automated detection and removal of nonprecipitating echo in radar data. J. Atmos. Oceanic Technol., 19, 673686.

    • Search Google Scholar
    • Export Citation
  • Turton, J. D., D. A. Bennets, and S. F. G. Farmer, 1988: An introduction to radio ducting. Meteor. Mag., 117, 245254.

  • von Engeln, A., and J. Teixeira, 2004: A ducting climatology derived from the European Centre for Medium-Range Weather Forecasts global analysis fields. J. Geophys. Res., 109, D18104, doi:10.1029/2003JD004380.

    • Search Google Scholar
    • Export Citation
  • von Engeln, A., G. Nedoluha, and J. Teixeira, 2003: An analysis of the frequency and distribution of ducting events in simulated radio occultation measurements based on ECMWF fields. J. Geophys. Res., 108, 4669, doi:10.1029/2002JD003170.

    • Search Google Scholar
    • Export Citation
  • Yang, K.-D., Y.-L. Ma, Y. Shi, 2009: Spatio-temporal distributions of evaporation duct for the West Pacific Ocean. Acta Phys. Sin., 58, 73397350.

    • Search Google Scholar
    • Export Citation
  • Yao, Z.-Y., B.-L. Zhao, W.-B. Li, Y.-J. Zhu, J.-L. Du, and F.-S. Dai, 2000: The analysis on characteristics of atmospheric duct and its effects on the propagation of electromagnetic wave. Acta Meteor. Sin., 58, 605616.

    • Search Google Scholar
    • Export Citation
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Observational Occurrence of Tropical Cyclone Ducts from GPS Dropsonde Data

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  • 1 Institute of Meteorology and Oceanography, People’s Liberation Army University of Science and Technology, Nanjing, Jiangsu, China
  • | 2 Beijing, China
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Abstract

On the basis of global positioning system dropsonde data, Japan Meteorology Agency Regional Spectral Model analysis data, National Centers for Environmental Prediction reanalysis data, satellite products from the Naval Research Laboratory, and best-track tropical-cyclone (TC) datasets from the Shanghai Typhoon Institute, the statistical characteristics of the ducts induced by TCs (TC ducts) over the western North Pacific Ocean were analyzed for the period from September 2003 to September 2006, and two typical strong-duct cases with remarkable differences in formation cause were analyzed and compared. Of the total of 357 dropsondes, there are 212 cases that show ducting conditions, with an occurrence percentage of ~59%. Of the 212 TC-duct events, profiles with multiple ducting layers make up nearly one-half, with the main type of ducts being elevated ducts; in contrast, weak ducts make up over one-half, resulting in a weak median duct strength and thickness. Ducts formed in the transition zone, especially on the left side of TC tracks, tend to be much stronger and thicker than those formed inside TCs. The former are induced by the interaction between TCs and their surrounding systems, such as the inrush of dry and cold air from the north on the left side of TC tracks. The latter are associated with successive subsidence in the gaps between spiral cloud bands. With increasing TC intensities, the associated ducts inside TCs tend to be much stronger and thicker and to appear at higher altitudes.

Corresponding author address: Dr. Jianfang FEI, Institute of Meteorology and Oceanography, PLA University of Science and Technology, 60 Shuanglong St., Nanjing, CN 211101, China. E-mail: feijf@sina.com

Abstract

On the basis of global positioning system dropsonde data, Japan Meteorology Agency Regional Spectral Model analysis data, National Centers for Environmental Prediction reanalysis data, satellite products from the Naval Research Laboratory, and best-track tropical-cyclone (TC) datasets from the Shanghai Typhoon Institute, the statistical characteristics of the ducts induced by TCs (TC ducts) over the western North Pacific Ocean were analyzed for the period from September 2003 to September 2006, and two typical strong-duct cases with remarkable differences in formation cause were analyzed and compared. Of the total of 357 dropsondes, there are 212 cases that show ducting conditions, with an occurrence percentage of ~59%. Of the 212 TC-duct events, profiles with multiple ducting layers make up nearly one-half, with the main type of ducts being elevated ducts; in contrast, weak ducts make up over one-half, resulting in a weak median duct strength and thickness. Ducts formed in the transition zone, especially on the left side of TC tracks, tend to be much stronger and thicker than those formed inside TCs. The former are induced by the interaction between TCs and their surrounding systems, such as the inrush of dry and cold air from the north on the left side of TC tracks. The latter are associated with successive subsidence in the gaps between spiral cloud bands. With increasing TC intensities, the associated ducts inside TCs tend to be much stronger and thicker and to appear at higher altitudes.

Corresponding author address: Dr. Jianfang FEI, Institute of Meteorology and Oceanography, PLA University of Science and Technology, 60 Shuanglong St., Nanjing, CN 211101, China. E-mail: feijf@sina.com
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