Penetration of biomass-burning emissions from South Asia through the Himalayas: new insights from atmospheric organic acids.
Penetration of biomass-burning emissions from South Asia through the Himalayas: new insights from atmospheric organic acids.
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南亚生物质燃烧排放穿过喜马拉雅山：来自大气有机酸的新见解。
DOI：
10.1038/srep09580
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发表时间：
2015-04-09
影响因子：
4.6
通讯作者：
Fu P
中科院分区：
文献类型：
--
作者：
Cong Z;Kawamura K;Kang S;Fu P
南亚、喜马拉雅山脉和青藏高原附近地区存在高水平的碳质气溶胶。人们对它们能否跨越喜马拉雅山脉，甚至内陆到青藏高原的运输知之甚少。有机酸作为气溶胶的重要成分，已被认为是识别大气过程的唯一指纹。在这里，我们测量了山顶北坡气溶胶中的二元酸及其相关化合物。珠穆朗玛峰(珠穆朗玛峰，4276 M.S.L.)二元酸与生物质燃烧示踪剂、左旋葡聚糖、K+呈显著正相关，表明该地区受生物质燃烧的影响较大。二元酸的季节变化规律与有机碳和电导率一致，在季风季前有一个明显的高值期。二元酸及其相关化合物(丙二酸/琥珀酸、马来酸/富马酸)的分子分布进一步支持这一发现。我们认为，当地的气象条件和区域大气流动过程有利于南亚碳质气溶胶在喜马拉雅山脉的穿透。考虑到碳质气溶胶变暗的力量，我们的发现对这一气候敏感地区具有重要意义，那里的冰川融化为下游数十亿人提供水。
High levels of carbonaceous aerosol exist over South Asia, the area adjacent to the Himalayas and Tibetan Plateau. Little is known about if they can be transported across the Himalayas, and as far inland as the Tibetan Plateau. As important constituents of aerosols, organic acids have been recognized as unique fingerprints to identify the atmospheric process. Here we measured dicarboxylic acids and related compounds in aerosols on the northern slope of Mt. Everest (Qomolangma, 4276 m a.s.l.). Strong positive correlations were observed for dicarboxylic acids with biomass burning tracers, levoglucosan and K+, demonstrating that this area was evidently affected by biomass burning. The seasonal variation pattern of dicarboxylic acids is consistent with OC and EC, being characterized by a pronounced maximum in the pre-monsoon season. Molecular distributions of dicarboxylic acids and related compounds (malonic acid/succinic acid, maleic acid/fumaric acid) further support this finding. We suggest that the local meteorological conditions and regional atmospheric flow process could facilitate the penetration of the carbonaceous aerosols from South Asia throughout the Himalayas. With the consideration of the darkening force of carbonaceous aerosols, our finding has important implication for this climate-sensitive area, where the glacier melting supplies water for billions of people downstream.