Properties and decay of stratospheric aerosols in the Arctic following the 1991 eruptions of Mount Pinatubo

Journal Article · Fri Nov 05 04:00:00 EST 1993 · Geophysical Research Letters (American Geophysical Union); (United States)

DOI:https://doi.org/10.1029/93GL02684· OSTI ID:5370219

Stone, R S; Key, J R ^[1]; Dutton, E G ^[2]

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1. Univ. of Colorado, Boulder, CO (United States)
2. NOAA, Boulder, CO (United States)

Sunphotometer observations made from an aircraft several months after the June 1991 eruptions of Mount Pinatubo are used to quantify the spectral opacity of the Arctic stratosphere. Ancillary surface-based measurements are presented in support of the aircraft data that show large increases in stratospheric optical depth attributed to the presence of volcanic aerosols. Visible optical depths greater than 0.2 were observed during flight segments flown above the tropopause. An inversion algorithm and the optical depth data are used to infer effective aerosol size distributions. The distributions tend to be dimodal, having a large-pArcticle mode radius of about 0.50 [mu]m and a small-particle mode of higher concentration with radii less than 0.18 [mu]. Surface measurements made during spring 1992 and 1993 are also used to estimate a time constant (e-folding time) of about 13.5 months assuming that the Arctic stratosphere's opacity decays exponentially; this estimate is larger than decay times observed following the major volcanic eruptions. These results suggest that any climate perturbations in the Artic caused by the eruptions of Pinatubo may be significant and will very likely persist longer than any volcanically-induced changes observed there during the past century.

• OSTI ID: 5370219
• Journal Information: Geophysical Research Letters (American Geophysical Union); (United States), Journal Name: Geophysical Research Letters (American Geophysical Union); (United States) Vol. 20:21; ISSN GPRLAJ; ISSN 0094-8276
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AEROSOLS
COLLOIDS
CRYOSPHERE
DISPERSIONS
EARTH ATMOSPHERE
ECOLOGICAL CONCENTRATION
ERUPTION
FLUIDS
GASES
LIFETIME
OPACITY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
POLAR REGIONS
SOLS
STRATOSPHERE
VOLCANIC GASES