000			02595nam a22003377a 4500
999			_c151044 _d151044
003			CR-SiIICA
005			20230703181204.0
007			ta
008			230703t2004 ||||| |||| 00| 0 spa d
040			_aCR-SiIICA _beng
041			_aeng
100			_aAllen, A.G
100			_aCardoso, A.A _954091
100			_ada Rocha, G.O
245			_aInfluence of sugar cane burning on aerosol soluble ion composition in Southeastern Brazil
260			_bELSEVIER _c2004
270			_aSan José, C.R.
300			_a14 páginas
520			_aSeasonal variability in the major soluble ion composition of atmospheric particulate matter in the principal sugar cane growing region of central Sao Paulo State indicates that pre-harvest burning of sugar cane plants is an important influence on the regional scale aerosol chemistry. Results indicated that the principal sources of the aerosols investigated were local or regional in nature (scale of tens to a few hundreds of km), and that differences between air masses of varying origins were small. Fine particles were typically acidic, containing secondary nitrates, sulphates and organic species. Coarse fraction concentrations were mainly influenced by physical parameters (wind speed, movement of vehicles and surface condition) affecting rates of re-suspension, although secondary nitrate and sulphate were also present in the larger particles. Concentrations of all measured species except sodium and chloride were higher during the burning season. Although concentrations were lower than often found in polluted urban environments, the massive increases during much of the year, due to a single anthropogenic activity (sugar cane burning) are indicative of a very large perturbation of the lower troposphere in the region relative to the natural condition. These aerosols are suspected of promoting respiratory disease. They also represent an important mechanism for the tropospheric transport of species relevant to surface acidification (sulphates, nitrates, ammonium and organic acids) and soil nutrient status (potassium, nitrogen, ammonium, calcium), so their impact on fragile natural ecosystems (following deposition) needs to be considered.
650		0	_9304175 _aAEROSOLS
650		0	_9323992 _aIONS
650		0	_9165668 _aSUGAR CANE
650		0	_9137969 _aBIOMASS
650		0	_aCAÑA DE AZUCAR _9139154
651			_aBRAZIL _922604
651			_aBRASIL _92040
787			_9352071 _aGCF CARICOM AgReady Reference
856			_uhttps://doi.org/10.1016/j.atmosenv.2004.06.019 _yeng
942			_2z _cRED