Measurements and modeling of reactive nitrogen deposition in southeast Brazil

Autor(es)

Allen, A. G. ; Machado, C. M. D. ; Cardoso, A. A.

• Tipo de documento: Artigo Científico
• Fonte: Environmental Pollution; v. 159, n. 5, p. 8-pg., 2011-05-01.

Resumo

Increased reactive nitrogen (N-r) deposition due to expansion of agro-industry was investigated considering emission sources, atmospheric transport and chemical reactions. Measurements of the main inorganic nitrogen species (NO2, NH3, HNO3, and aerosol nitrate and ammonium) were made over a period of one year at six sites distributed across an area of similar to 130,000 km(2) in southeast Brazil. Oxidized species were estimated to account for similar to 90% of dry deposited N-r, due to the region's large emissions of nitrogen oxides from biomass burning and road transport. NO2-N was important closer to urban areas, however overall HNO3-N represented the largest component of dry deposited Nr. A simple mathematical modeling procedure was developed to enable estimates of total Nr dry deposition to be made from knowledge of NO2 concentrations. The technique, whose accuracy here ranged from < 1% to 29%, provides a useful new tool for the mapping of reactive nitrogen deposition. (C) 2011 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 07/58219-7 - Estudo sobre a distribuição espacial e temporal de macronutrientes na atmosfera do estado de São Paulo
• Beneficiário: Cristine de Mello Dias Machado
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 08/58073-5 - Effects of emissions on current and future rainfall patterns in southeast Brazil
• Beneficiário: Arnaldo Alves Cardoso
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 09/07415-6 - Proposta para pesquisador visitante
• Beneficiário: Arnaldo Alves Cardoso
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional