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Mode radius and asymmetry factor of Mt. Pinatubo volcanic aerosols from balloon‐borne optical measurements over Hyderabad during October 1991
Author(s) -
Ramachandran S.,
Jayaraman A.,
Acharya Y. B.,
Subbaraya B. H.
Publication year - 1994
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 - 10.1029/94gl01651
Subject(s) - aerosol , volcano , radius , atmospheric sciences , sun photometer , vulcanian eruption , environmental science , geology , physics , meteorology , computer security , seismology , computer science
Using Sun‐tracking photometers onboard balloon, the Pinatubo volcanic aerosol layer has been studied over Hyderabad (17.5°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 µm 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 gm −2 which is 3.75 times higher than the earlier reported value for El Chichon layer, about 4 months after the eruptions.