The connection between tropical thunderstorms, upper tropospheric water vapor, and cirrus clouds

Details The connection between tropical thunderstorms, upper tropospheric water vapor, and cirrus clouds The connection between tropical thunderstorms, upper tropospheric water vapor, and cirrus clouds

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....3337p&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #3337

Physics

Scientific paper

The amplitude of future global warming will depend strongly on how upper tropospheric water vapor (UTWV) and cirrus clouds change in response to greenhouse gas forcings. Here we present evidence showing the close link between regional/global lightning activity and UTWV variability. Continental deep convective storms that transport large amounts of water vapor into the upper troposphere dominate the variability of global UTWV, while also being the storms that produce the majority of our planet's lightning. Furthermore, integrated regional and global lightning activity can be continuously observed from a few locations on the earth's surface via the Schumann Resonances (SR), an electromagnetic phenomenon in the atmosphere produced by global lightning. We have found that on a daily basis the regional and global UTWV maxima lags one day behind the lightning activity maxima. In addition we find a clear 5- and 9-day periodicity in the lightning and water vapor time series, with implications for tropical cirrus cloud variability. Observations of the SR may supply a cheap, convenient method of studying the long-term variability of tropical UTWV and cirrus clouds.

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