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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 22, issue 2
Ann. Geophys., 22, 697-700, 2004
https://doi.org/10.5194/angeo-22-697-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 22, 697-700, 2004
https://doi.org/10.5194/angeo-22-697-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

  01 Jan 2004

01 Jan 2004

Urban effect on the characteristics of cloud-to-groundlightning over Belo Horizonte-Brazil

I. R. C. A. Pinto, O. Pinto Jr., M. A. S. S. Gomes, and N. J. Ferreira I. R. C. A. Pinto et al.
  • National Institute of Space Research - INPE, Av. Astronautas 1758–Jd. Da Granja, Sao Jose dos Campos–Sao Paulo, 12227-010, Brazil

Abstract. An 8-year climatological analysis (1989–1996) of lightning network data over Belo Horizonte, a large city located in Southeastern Brazil, and nearby surrounding areas has indicated a significant enhancement of approximately 100% in the negative flash density and of 50% in the positive flash density over and downwind of the city, compared with the other adjacent areas. A decrease of 25% in the percentage of positive flashes was also observed over and downwind of the city. No urban effect was evident in the peak current of both negative and positive flashes. These results are in agreement with the recent results obtained by Steiger et al. (2002) for Houston, except that the strength of the effect is twice larger than in Houston. The reason for this difference is not clear.

Key words. Meteorology and atmospheric dynamics (atmospheric electricity; convective processes; lightning)

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