Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2597o&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 13, p. 2597-2600
Physics
43
Meteorology And Atmospheric Dynamics: Lightning, Meteorology And Atmospheric Dynamics: Mesoscale Meteorology, Meteorology And Atmospheric Dynamics: Remote Sensing
Scientific paper
Cloud-to-ground lighting flash data have been analyzed for the twelve-year period 1989-2000, for a geographical area centered on Houston, Texas. Of the 1.6 million cloud-to-ground flashes in this area of study, approximately 752,000 flashes occurred in the summer months of June, July, and August, and 119,000 flashes in the months of December, January, and February. The highest flash densities, greater than 4 flashes km-2 in the summer and 0.7 flashes/km-2 in the winter, are near the urban areas of Houston. We suggest that the elevated flash densities could result from several factors, including, 1) the convergence due to the urban heat island effect, and 2) the increasing levels of air pollution from anthropogenic sources producing numerous small droplets and thereby suppressing mean droplet size. The latter effect would enable more cloud water to reach the mixed phase region where it is involved in the formation of precipitation and the separation of electric charge, leading to an enhancement of lightning.
Allen Steve
Ely Brandon
Huffines Gary
Nielsen-Gammon John
Orville Richard E.
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