Influence of intensive agriculture on dry deposition of aerosol nutrients

Research output: Contribution to journalArticle

Authors

  • AA Cardoso
  • Antony Wiatr
  • CMD Machado
  • WC Paterlini

Abstract

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 PM2.5 mass, respectively. Re-suspension and biomass burning contributed 22% and 19%, respectively, to PM10 mass, and re-suspension accounted for approximately half of the mass of coarse particles. At least 40% of NO3--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).

Details

Original languageEnglish
Pages (from-to)87-97
Number of pages11
JournalJournal of the Brazilian Chemical Society
Volume21
Publication statusPublished - 1 Jan 2010

Keywords

  • nutrients, deposition, source apportionment, pollution, aerosols