ADEOS. Tropospheric ozone increase in dry season of 1997 during forest fires in Indonesia.

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Huge forest fires occurred in the dry season of 1997 in Indonesia. The fire smoke spread over Kalimantan, Sumatra, Indonesia and Malaysian Peninsula. Forest fires (biomass burning) has been thought to be a significant source of ozone precursors such as carbon monoxide, nitrogen oxides, and hydrocarbons. There will be a significant production of ozone, which is one of the important greenhouse gases and plays an important role in tropospheric chemistry. EORC/NASDA has made observations of atmospheric ozone with ozonesondes and a Brewer spectorophotometer at Watukosek, Indonesia under cooperation with LAPAN and University of Tokyo. Analyses have been made using ozone data at Watukosek and total ozone observed by Total Ozone Mapping Spectrometer (TOMS) on the satellites Advanced Earth Observing Satellite (ADEOS) and Earth Probe. The vertical ozone profiles show that the ozone mixing ratio has been enhanced especially above about 4 km altitude in the troposphere. The ozone mixing ratio sometimes reached over 100 nM/M (nano mol per mol). Total ozone observed by a Brewer spectorophotometer began to increase in the first half of September. Total ozone over 275 DU was frequently observed during the last half of September and October.
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