Physics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1975k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8534), vol. 20, no. 18, p. 1975-1978.
Physics
29
Aerosols, Atmospheric Chemistry, Nitrogen Dioxide, Ozonometry, Stratosphere, Volcanoes, Optical Radar, Sunlight
Scientific paper
Following the arrival of Pinatubo volcanic aerosols, significant decreases in NO2 column mount were observed at Moshiri, Japan (44 deg N, 142 deg E). A slight decrease started in September 1991, and reductions of more than 20 percent have been seen since January 1992. The reduction was largest in April 1992 when NO2 amounts were about 50 percent lower than observed in April 1991. Between May 1992 and January 1993, the reduction has been getting smaller, however, until October 1992, about 35 to 20 percent lower NO2 amounts were observed. At southern mid-latitudes, a clear decrease in NO2 started in August 1991 (Johnston et al., 1992). Aerosol data obtained from lidar measurements and the SAGE II satellite instrument show that the observed major reductions in NO2 in the both hemispheres generally correspond to the arrival of volcanic serosols above 25 km.
Johnston Paul V.
Koike Masafumi
Kondo Yoshihiko
Matthews Andrew W.
Yamazaki Kazutoshi
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