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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Sources of atmospheric acidity in an agricultural-industrial region of Sao Paulo State, Brazil - art. no. 4207
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Sources of atmospheric acidity in an agricultural-industrial region of Sao Paulo State, Brazil - art. no. 4207

机译：巴西圣保罗州农业地区的大气酸度来源-艺术。没有。 4207

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1] Surface-based measurements of atmospheric formic acid (HCOOH), acetic acid (CH3COOH), sulfur dioxide (SO2), hydrogen chloride (HCl), and nitric acid (HNO3) were made in central Sao Paulo State, Brazil, between April 1999 and March 2000. Mean concentrations were 9.0 ppb (HCOOH), 1.3 ppb (CH3COOH), 4.9 ppb (SO2), 0.3 ppb (HCl), and 0.5 ppb (HNO3). Concentrations in sugar cane burning plumes were 1160-4230 ppb (HCOOH), 360-1750 ppb (CH3COOH), 10-630 ppb (SO2), 4-210 ppb (HCl), and 14-90 ppb (HNO3). Higher ambient concentrations of SO2, HCl and HNO3 were measured during the burning season (May-November). Concentrations of SO2 and HCl increased during the evening, and of HCOOH and CH3COOH were lowest in the morning, with peak levels in the afternoon. Ratios obtained between different species showed either nighttime maxima (SO2/HCOOH, SO2/CH3COOH, SO2/HNO3, CH3COOH/HNO3, SO2/HCl and HCOOH/HNO3), daytime maxima (HCOOH/HCl, CH3COOH/HCl and HNO3/HCl), or no clear trends (HCOOH/CH3COOH). Correlation analysis showed that SO2 and HCl were primary emissions from biomass burning and road transport; HCOOH, HNO3 and CH3COOH were products of photochemistry; HCOOH and CH3COOH were emitted directly during combustion as well as from biogenic sources. Biomass burning affected atmospheric acidity on a regional scale, while vehicular emissions had greater impact in urban and adjacent areas. Atmospheric ammonia levels were insufficient to neutralize atmospheric acidity, which was mainly removed by deposition to the surface. [References: 52
机译：1] 4月之间，在巴西圣保罗州中部对大气中的甲酸（HCOOH），乙酸（CH3COOH），二氧化硫（SO2），氯化氢（HCl）和硝酸（HNO3）进行了基于表面的测量。 1999年和2000年3月。平均浓度为9.0 ppb（HCOOH），1.3 ppb（CH3COOH），4.9 ppb（SO2），0.3 ppb（HCl）和0.5 ppb（HNO3）。甘蔗燃烧烟羽中的浓度为1160-4230 ppb（HCOOH），360-1750 ppb（CH3COOH），10-630 ppb（SO2），4-210 ppb（HCl）和14-90 ppb（HNO3）。在燃烧季节（5月至11月）测得较高的SO2，HCl和HNO3环境浓度。晚上，SO2和HCl的浓度增加，早晨的HCOOH和CH3COOH的浓度最低，下午的浓度最高。不同物种之间获得的比率显示出夜间最大值（SO2 / HCOOH，SO2 / CH3COOH，SO2 / HNO3，CH3COOH / HNO3，SO2 / HCl和HCOOH / HNO3），白天最大值（HCOOH / HCl，CH3COOH / HCl和HNO3 / HCl） ，或者没有明确的趋势（HCOOH / CH3COOH）。相关分析表明，SO2和HCl是生物质燃烧和道路运输的主要排放物。 HCOOH，HNO3和CH3COOH是光化学的产物。 HCOOH和CH3COOH在燃烧过程中直接排放，也从生物源排放。生物质燃烧在一个区域范围内影响了大气酸度，而车辆排放对城市和邻近地区的影响更大。大气中的氨含量不足以中和大气中的酸度，而酸度主要通过沉积在表面上而除去。 [参考：52

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