Report on Atmospheric Effects (1980-1989) — May 1986
Scientific Event Alert Network Bulletin, vol. 11, no. 5 (May 1986)
Managing Editor: Lindsay McClelland.
Atmospheric Effects (1980-1989) Ruiz aerosols persist; balloon data since 1971
Please cite this report as:
Global Volcanism Program, 1986. Report on Atmospheric Effects (1980-1989). In: McClelland, L. (ed.), Scientific Event Alert Network Bulletin, 11:5. Smithsonian Institution.
Atmospheric Effects (1980-1989)
All times are local (unless otherwise noted)
Balloon soundings from Laramie, WY on 19 May showed maximum particle concentrations of about 2.8/cm, (radius > 0.15 µm) at about 20 km altitude. Figure 25 plots 1971-86 balloon data, showing perturbations associated with major eruptions.
Lidar instruments in Virginia, Hawaii, Japan, and Germany continued to detect stratospheric aerosol layers thought to be from the 13 November 1985 eruption of Ruiz. At Mauna Loa, Hawaii, backscattering ratios of the sharp layer centered at 20.5-21 km diminished through May, while backscattering was enhanced at higher altitudes (figure 26). Higher altitude material had first been detected over Hampton, VA on 29 April, and peak backscattering ratios were at 20.5-21.5 km in early June, up from 19-20 km in early May. The lower layer appeared to be weakening and did not form a distinct peak. At Fukuoka, Japan, lidar continued to measure 2-3 layers in April and May, generally centered at altitudes of about 19 and 21-23 km, similar to March observations. From Garmisch-Partenkirchen, Germany, peak May backscattering ratios were similar to those of April, but altitudes increased slightly.
Information Contacts: David Hofmann and James Rosen, Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071 USA; Motowo Fujiwara, Physics Department, Kyushu University, Fukuoka 812, Japan; Thomas DeFoor, Mauna Loa Observatory, P.O Box 275, Hilo, HI 96720 USA; H. Jäger, Fraunhofer-Institut für Atmosphärische Umweltforschung, Kreuzeckbahnstrasse 19, D-8100 Garmisch-Partenkirchen, West Germany; William Fuller, NASA Langley Research Center, Hampton, VA 23665 USA.