Abstract
SO2 concentrations varied from background levels of less than 0.05 ppbv to a maximum of 50 ppbv, during episodes that lasted from 3 to 24 hours. Emissions from the Kilauea crater, approximately 35 km southeast of the observatory at an elevation of about 1000 m above sea level (asl), and the current eruption at Puu O'o 50 km east-southeast, are the most likely sources for the higher concentrations. A clear diurnal cycle of SO2 concentration exists throughout the year, although day-night changes were greatest during October-January and were barely detectable during the June-September period. Twenty-four nighttime free tropospheric events were recorded when the SO2 concentration exceeded 0.2 ppbv. During 18 of these episodes, usually high CO2 concentrations were observed. -from Authors
Original language | English |
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Pages (from-to) | 6011-6022 |
Number of pages | 12 |
Journal | Journal of Geophysical Research |
Volume | 97 |
Issue number | D5 |
DOIs | |
State | Published - 1992 |