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中国秸杆焚烧及民用燃煤棕色碳排放的初步研究
Authors
孟凡
支国瑞
+5 more
方引
李剑
蔡竟
薛志钢
陈颖军
Publication date
1 January 2014
Publisher
Abstract
近年来的研究表明,在BC(黑碳)和OC(有机碳)之间,还存在着一种有弱吸光能力的OC,因大多显棕黄色而被称为BrC (brown carbon,棕色碳). 广泛存在的秸杆焚烧和冬季大量民用燃煤的使用,使国内BrC 排放严重,但鲜见对其排放量的测算. 采用七波段黑碳仪(aethalometer)方法,对夏季小麦秸杆焚烧过程及冬季民用炉燃煤过程产生的烟气进行现场监测,根据BrC 与BC的光谱关联性差别,分化出R_(BrC/BC)(总光学衰减中BrC和BC的相对贡献). 结果表明: 麦秆焚烧和民用燃煤烟气的R_(BrC/BC)分别为1. 754 ± 0. 278和0. 183 ± 0. 142. 借助R_(BrC/BC)值,结合现有的BC 排放清单(2000年),初步推算出中国民用燃煤和秸杆田间焚烧 BrC的排放总量(以BC 当量计,下同)为(270. 6 ± 101. 6)Gg,接近同期BC 排放量的一半; 其中秸杆焚烧的BrC 排放量为(175. 4 ± 27. 8)Gg,约占二者总量的65%; 民用燃煤的BrC 排放量为(95. 2 ± 73. 7)Gg,约占35%. 该研究结果可为更全面的BrC 排放测算奠定基础,并为研究BrC的大气化学及辐射强迫提供依据
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Last time updated on 24/06/2021