Physics
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3709809m&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 9, CiteID L09809
Physics
Biogeosciences: Trace Element Cycling (4875), Atmospheric Composition And Structure: Pollution: Urban And Regional (0305, 0478, 4251), Global Change: Land/Atmosphere Interactions (1218, 1843, 3322), Biogeosciences: Soils/Pedology (1865), Global Change: Land Cover Change
Scientific paper
Several recent studies have indicated that forest fires are likely to re-emit important quantities of atmospherically deposited mercury (Hg) to the atmosphere. Although the Amazon forest accounts for approximately 25% of the world's total rainforest, few data are available about these emissions. The emissions of mercury from prescribed fires of two 4-ha plots of Amazon forest were investigated. Hg concentration and Hg burden were determined for vegetation, litter and soil before and after the fires. The data show that only Hg present in the aboveground vegetation and in the O-horizon was volatilised; no significant soil emission was observed. Before the fire, the Hg stored in the vegetation (logs, branches, leaves and litter) ranged from 3.7 to 4.0 g ha-1 while 1.8 g ha-1 was found in the O-horizon. The mass balance calculations of the present work indicate an average Hg emission of 3.5 g ha-1 due to forest fires, with 1.6 ha-1 originating from O-horizon and 1.9 from above ground vegetation. On the base of the average annual deforestation rate of the Brazilian Amazon between 2000 and 2008, an annual Hg emission of 6.7 Mg yr-1 was estimated.
Carvalho João Andrade de
Fostier Anne Hélène
Magarelli Gabriella
Michelazzo Paula Albernaz Machado
Santos José Carlos
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