Mode radius and asymmetry factor of Mt. Pinatubo volcanic aerosols from balloon-borne optical measurements over Hyderabad during October 1991

Journal Article · Thu Sep 01 04:00:00 EDT 1994 · Geophysical Research Letters

DOI:https://doi.org/10.1029/94GL01651· OSTI ID:85401

Ramachandran, S; Jayaraman, A; Acharya, Y B; Subbaraya, B H ^[1]

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1. Physical Research Lab., Ahmedabad (India)

Using Sun-tracking photometers onboard balloon, the Pinatubo volcanic aerosol layer has been studied over Hyderabad (17.5 deg N) in October 1991, about 4 months after the eruption. From the aerosol extinction coefficients the mode radius and from the angular distribution of the scattered radiation intensity measurements the asymmetry factor g are determined. Mode radii are found to be in the range of 0.22 +/ 0.05 microns within the aerosol layer while g values are found to be 0.83 +/- 0.04, indicating the presence of larger particles. The mass determination reveals that the mass of the Pinatubo layer is about 0.053/sq gm which is 3.75 times higher than the earlier reported value for El Chichon layer, about 4 months after the eruptions.

• OSTI ID: 85401
• Journal Information: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 18 Vol. 21; ISSN GPRLAJ; ISSN 0094-8276
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AERIAL MONITORING
AEROSOLS
AIR POLLUTION
PHILIPPINES
STRATOSPHERE
VOLCANOES