Indonesian smoke aerosols from peat fires and the contribution from volcanic sulfur emissions

Details Indonesian smoke aerosols from peat fires and the contribution from volcanic sulfur emissions Indonesian smoke aerosols from peat fires and the contribution from volcanic sulfur emissions

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30k...1l&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 11, pp. 1-1, CiteID 1547, DOI 10.1029/2002GL016646

Physics

5

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801), Atmospheric Composition And Structure: Volcanic Effects (8409), Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Atmospheric Composition And Structure: Pollution-Urban And Regional (0305)

Scientific paper

The island arc volcanoes in and around Indonesia have been permanently degassing for thousands of years, thereby contributing significantly to the total emissions of sulfur species in that region. The hot and wet tropical weather conditions with high solar irradiation and regular daily precipitation during the wet season lead to efficient removal of oxidised sulfate by wet deposition. This is accumulated in the Indonesian peat areas, which serve as natural sponges, soaking up rain during the wet season and slowly releasing moisture into the atmosphere during the dry season. When peat forests are drained for land clearing purposes, the peat quickly dries out and becomes extremely flammable. When ignited, the composition of the burning peat mainly determines the fire aerosol chemical composition and microphysical properties. In this paper we investigate the contribution of volcanic sulfur emissions to wet deposition of sulfur in Indonesian peat swamp areas based on numerical simulations carried out with a global atmospheric circulation model including the tropospheric sulfur cycle. Our study suggests that the observed hygroscopicity and elevated sulfur content of the Indonesian peat fire aerosols is due to accumulated volcanic sulfur.

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