NO2 emissions from agricultural burning in São Paulo, Brazil
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2004-09-01
Autores
Oppenheimer, C.
Tsanev, VI
Allen, A. G.
McGonigle, AJS
Cardoso, Arnaldo Alves [UNESP]
Wiatr, A.
Paterlini, W.
De Mello, C.
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Amer Chemical Soc
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We report here on the application of a compact ultraviolet spectrometer to measurement of NO2 emissions from sugar cane field burns in São Paulo, Brazil, the time-resolved NO2 emission from a 10 ha plot peaked at about 240 g (NO2) s(-1), and amounted to a total yield of approximately 50 kg of N, or about 0.5 g (N) m(-2). Emission of N as NOx (i.e., NO + NO2) was estimated at 2.5 g (N) in 2, equivalent to 30% of applied fertilizer nitrogen. The corresponding annual emission of NOx nitrogen from São Paulo State sugar cane burning was >45 Gg N. In contrast to mechanized harvesting, which does not require prior burning of the crop, manual harvesting with burning acts to recycle nitrogen into surface soils and ecosystems.
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Environmental Science & Technology. Washington: Amer Chemical Soc, v. 38, n. 17, p. 4557-4561, 2004.