Physics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..698g&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 10, no. 9, p. 698-707.
Physics
1
Aerosols, Air Pollution, Atmospheric Circulation, Effusives, Environment Effects, Troposphere, Anomalous Temperature Zones, Atmospheric General Circulation Models, Atmospheric Heating, El Nino
Scientific paper
An experiment was performed with the Hamburg General Circulation Model ECHAM to study the possible impact of volcanic aerosols precipitating from the stratosphere during the first few months after a violent volcanic eruption. Heating rate anomalies were prescribed for the upper tropical troposphere according to a previous paper by Hirono (1988). The maximum aerosol concentrations were set near the latitudes of two recent strong volcanoes, Mt. Agung (1963) at 2.8 deg S and El Chichon (1982) at 19.7 deg N. The modelled effects are highly significant throughout the troposphere. The anomaly patterns depend on the position of the heating rate anomaly relative to the Intertropical Convergence Zone. The effect on near surface wind stress over the equatorial Pacific seems to exclude a trigger effect for the 1982 eruption of El Chichon on the El Nino event of the same year. The Agung upper tropospheric aerosol might have had some influence on the onset of the 1963 weak El Nino.
Graf Hans-F.
Kirchner Ingo
Sausen Robert
Schubert Sven
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