Evidence of thermal and aerosol effects on the cloud-to-ground lightning density and polarity over large urban areas of Southeastern Brazil

Details Evidence of thermal and aerosol effects on the cloud-to-ground lightning density and polarity over large urban areas of Southeastern Brazil Evidence of thermal and aerosol effects on the cloud-to-ground lightning density and polarity over large urban areas of Southeastern Brazil

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30m...7n&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 13, pp. 7-1, CiteID 1674, DOI 10.1029/2003GL017496

Physics

9

Atmospheric Composition And Structure: Pollution-Urban And Regional (0305), Meteorology And Atmospheric Dynamics: Atmospheric Electricity, Meteorology And Atmospheric Dynamics: Lightning

Scientific paper

The Brazilian lightning detection network detected about 310,000 cloud-to-ground flashes over three large metropolitan areas in Southeastern Brazil during three summer seasons (from 2000 to 2002). It was observed an enhancement of 60-100% in the flash density over the urban areas compared to their surroundings. Conversely, a decrease of 7-8% in the percentage of positive flashes was also observed. The spatial distribution of the flashes follows closely the shape of the São Paulo city heat island, thereby supporting the thermal hypothesis. The PM10 concentration showed a positive linear correlation with the number of cloud-to-ground flashes and a negative correlation with the percentage of positive flashes, supporting the aerosol hypothesis. These results indicate that both hypotheses should be considered to explain the CG lightning enhancements over the urban areas. However, only the aerosol hypothesis could better support the decrease of the percentage of positive flashes.

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