Influence of intensive agriculture on dry deposition of aerosol nutrients

Journal of the Brazilian Chemical Society

Andrew G. Allen²  Arnaldo A. Cardoso²  Antony G. Wiatr¹  Cristine M. D. Machado²  Willian C. Paterlini²  Jacob Baker¹ 

[1] ,Universidade Estadual Paulista Instituto de Química Araraquara SP ,Brazil

关键词: aerosols;    pollution;    deposition;    nutrients;    source apportionment;   

DOI  :  10.1590/S0103-50532010000100014

来源: SciELO

【 摘 要 】

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).

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License