Measurements and modeling of reactive nitrogen deposition in southeast Brazil.
Environ Pollut
; 159(5): 1190-7, 2011 May.
Article
in En
| MEDLINE
| ID: mdl-21354679
ABSTRACT
Increased reactive nitrogen (Nr) 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 â¼130,000 km2 in southeast Brazil. Oxidized species were estimated to account for â¼90% of dry deposited Nr, 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.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Reactive Nitrogen Species
/
Air Pollutants
/
Models, Chemical
Country/Region as subject:
America do sul
/
Brasil
Language:
En
Journal:
Environ Pollut
Journal subject:
SAUDE AMBIENTAL
Year:
2011
Type:
Article
Affiliation country:
Brazil