Artículos de revistas
Influence of Intensive Agriculture on Dry Deposition of Aerosol Nutrients
Fecha
2010-01-01Registro en:
Journal of The Brazilian Chemical Society. São Paulo: Soc Brasileira Quimica, v. 21, n. 1, p. 87-97, 2010.
0103-5053
10.1590/S0103-50532010000100014
S0103-50532010000100014
WOS:000275106400013
S0103-50532010000100014.pdf
9165109840414837
Autor
Universidade Estadual Paulista (Unesp)
Univ Birmingham
Institución
Resumen
A procedure is presented for quantification of sources contributing to atmospheric aerosol chemical nutrient concentrations and dry deposition fluxes. Source apportionment using principal component analysis (PCA) and multiple linear regression analysis (MLRA) was followed by application of a size-segregated particle dry deposition model. In a rural region of southeast Brazil, biomass burning, products of secondary reactions, and soil dust re-suspension explained 43%, 31% and 21% of PM(2.5) mass, respectively. Re-suspension and biomass burning contributed 22% and 19%, respectively, to PM(10) mass, and re-suspension accounted for approximately half of the mass of coarse particles. At least 40% of NO(3)(-)-N, 20% of phosphorus and 55% of potassium deposited originated from agriculture-related emissions. Deposition to tropical forest is currently higher than the minimum under natural conditions by factors of 12.2 (N), 6.2 (P) and 2.6 (K).