Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmae11a0064w&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #AE11A-0064
Other
3324 Lightning, 3329 Mesoscale Meteorology, 3374 Tropical Meteorology, 3384 Waves And Tides, 4275 Remote Sensing And Electromagnetic Processes (0689)
Scientific paper
A zonal analysis of surface pressure observations has been undertaken to understand previously correlated rainfall and mesoscale lightning activity over the African continent on a five day time scale. The mesoscale lightning is recorded globally using Schumann resonance methods at a receiving station in West Greenwich, Rhode Island. The pressure analysis confirms the presence of a dominant wavenumber-1 planetary wave, with westward progression, identified earlier by Madden and Julian (1972), a global Rossby wave with characteristic period near 5 days. The observed phase relationship indicates declining pressure over Africa when the mesoscale lightning flash rate is maximum. Other evidence supports the idea that the wave is causal to the lightning and rainfall variations. If correct, this hypothesis requires a vertical component in the planetary wave motion.
Boldi R.
Patel A. C.
Williams Robert E.
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