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DOI	10.1126/science.250.4988.1669
	Biomass burning in the tropics: Impact on atmospheric chemistry and biogeochemical cycles
	Grutzen P.J.; Andreae M.O.
发表日期	1990
ISSN	0036-8075
起始页码	1669
结束页码	1678
卷号	250 期号:4988
英文摘要	Biomass burning is widespread, especially in the tropics. It serves to clear land for shifting cultivation, to convert forests to agricultural and pastoral lands, and to remove dry vegetation in order to promote agricultural productivity and the growth of higher yield grasses. Furthermore, much agricultural waste and fuel wood is being combusted, particularly in developing countries. Biomass containing 2 to 5 petagrams of carbon is burned annually (1 petagram = 1015 grams), producing large amounts of trace gases and aerosol particles that play important roles in atmospheric chemistry and climate. Emissions of carbon monoxide and methane by biomass burning affect the oxidation efficiency of the atmosphere by reacting with hydroxyl radicals, and emissions of nitric oxide and hydrocarbons lead to high ozone concentrations in the tropics during the dry season. Large quantities of smoke particles are produced as well, and these can serve as cloud condensation nuclei. These particles may thus substantially influence cloud microphysical and optical properties, an effect that could have repercussions for the radiation budget and the hydrological cycle in the tropics. Wide-spread burning may also disturb biogeochemical cycles, especially that of nitrogen. About 50 percent of the nitrogen in the biomass fuel can be released as molecular nitrogen. This pyrodenitrification process causes a sizable loss of fixed nitrogen in tropical ecosystems, in the range of 10 to 20 teragrams per year (1 teragram = 1012 grams).
英文关键词	Poaceae; aerosol particle; biogeochemical cycle; biomass burning; carbon monoxide; hydrocarbon; hydroxyl radical; methane; nitric oxide; nitrogen; oxidation efficiency; ozone; trace gas; tropics
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/243885
作者单位	Depts. Atmosph. Chem. B., Max Planck Institute for Chemistry, Post Office Box 3060, D-6500 Mainz, Germany
推荐引用方式 GB/T 7714	Grutzen P.J.,Andreae M.O.. Biomass burning in the tropics: Impact on atmospheric chemistry and biogeochemical cycles[J],1990,250(4988).
APA	Grutzen P.J.,&Andreae M.O..(1990).Biomass burning in the tropics: Impact on atmospheric chemistry and biogeochemical cycles.Science,250(4988).
MLA	Grutzen P.J.,et al."Biomass burning in the tropics: Impact on atmospheric chemistry and biogeochemical cycles".Science 250.4988(1990).