Gaseous mercury emissions from a fire in the Cape Peninsula, South Africa, during January 2000
Gaseous mercury emissions from a fire in the Cape Peninsula, South Africa, during January 2000
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DOI：
10.1029/2000gl012193
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发表时间：
2001-04-15
影响因子：
5.2
通讯作者：
Slemr, F
中科院分区：
文献类型：
--
作者：
Brunke, EG;Labuschagne, C;Slemr, F
2000年1月中旬，一场大火烧毁了开普半岛南部9000公顷的混合植被，其产生的烟羽飘过了开普角全球大气监测站（南纬34度，东经18度）。烟羽的特征是一氧化碳/二氧化碳排放比（ER）为0.0548 ± 0.0018摩尔/摩尔，这是生物质燃烧的典型值。在此期间对气态总汞（TGM）的测量得出汞/一氧化碳和汞/二氧化碳排放比分别为（2.10 ± 0.21）×10⁻⁷和（1.19 ± 0.30）×10⁻⁸摩尔/摩尔。根据目前公认的生物质燃烧一氧化碳源估计值为621×10³千吨/年（范围为400 - 700×10³千吨/年），汞/一氧化碳排放比表明生物质燃烧产生的全球汞排放每年约为0.93千吨（范围为0.51 - 1.14千吨/年）。同样，根据生物质燃烧产生的二氧化碳排放量为3460×10³千吨碳/年（范围为3000 - 6200千吨碳/年），汞/二氧化碳排放比表明生物质燃烧产生的全球汞排放每年约为0.59千吨（范围为0.38 - 1.33千吨/年），这与根据汞/一氧化碳排放比估算的排放量非常吻合。如果得到其他地区火灾测量结果的支持，生物质燃烧产生的汞排放约为1千吨/年，这可能是迄今为止被忽视的大气汞的主要来源之一。
During mid-January 2000 the plume from a fire, which destroyed 9000 ha of mixed vegetation in the southern part of the Cape Peninsula, passed over the Cape Point Global Atmosphere Watch station (34 degreesS, 18 degreesE). The smoke plume was characterized by a CO/CO2 emission ratio (ER) of 0.0548 +/- 0.0018 mol/mol, typical for biomass burning. Measurements of total gaseous mercury (TGM) made during this episode provided Hg/CO and Hg/CO2 emission ratios of (2.10 +/- 0.21) * 10(-7) and (1.19 +/- 0.30) * 10(-8) mol/mol, respectively. Based on the presently accepted CO source estimate for biomass burning of 621 * 10(3) kt yr(-1) (range 400 - 700 * 10(3) kt yr(-1)), the ER(Hg/CO) suggests that the global mercury emission from biomass burning amounts to approximately 0.93 kt annually (range 0.51 - 1.14 kt yr(-1)). Similarly, based on a CO2 emission from biomass burning of 3460 * 103 ktC yr(-1) (range 3000 - 6200 ktC yr(-1)), the ER(Hg/CO2) suggests that the global mercury emission from biomass burning amounts to approximately 0.59 kt annually (range 0.38 - 1.33 kt yr(-1)), in good agreement with the emission estimated from the ER(Hg/CO). If supported by measurements from fires in other regions, mercury emissions from biomass burning of the order of 1 kt yr(-1) could represent one of the major, hitherto neglected, sources of atmospheric mercury.