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Decrease of stratospheric NO 2 at 44°N caused by Pinatubo volcanic aerosols
Author(s) -
Koike M.,
Kondo Y.,
Matthews W. A.,
Johnston P. V.,
Yamazaki K.
Publication year - 1993
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/93gl01800
Subject(s) - volcano , stratosphere , aerosol , atmospheric sciences , environmental science , latitude , vulcanian eruption , geology , meteorology , geography , geodesy , seismology
Following the arrival of Pinatubo volcanic aerosols, significant decreases in NO 2 column amount were observed at Moshiri, Japan (44°N, 142°E). A slight decrease started in September 1991 and reductions of more than 20 % have been seen since January 1992. The reduction was largest in April 1992 when NO 2 amounts were about 50 % 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 % lower NO 2 amounts were observed. At southern mid‐latitudes, a clear decrease in NO 2 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 NO 2 in the both hemispheres generally correspond to the arrival of volcanic aerosols above 25 km.