| Full text | |
| Author(s): |
Allen, A. G.
;
Machado, C. M. D.
;
Cardoso, A. A.
Total Authors: 3
|
| Document type: | Journal article |
| Source: | Environmental Pollution; v. 159, n. 5, p. 8-pg., 2011-05-01. |
| Abstract | |
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) | |
| FAPESP's process: | 07/58219-7 - Study of the spatial and temporal distribution of macronutrients in the atmosphere of the State of São Paulo |
| Grantee: | Cristine de Mello Dias Machado |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 08/58073-5 - Effects of emissions on current and future rainfall patterns in southeast Brazil |
| Grantee: | Arnaldo Alves Cardoso |
| Support Opportunities: | Research Program on Global Climate Change - Thematic Grants |
| FAPESP's process: | 09/07415-6 - Visiting researcher proposal |
| Grantee: | Arnaldo Alves Cardoso |
| Support Opportunities: | Research Grants - Visiting Researcher Grant - International |