Major 20th century changes of the content and chemical speciation of organic carbon archived in Alpine ice cores: Implications for the long‐term change of organic aerosol over Europe
Major 20th century changes of the content and chemical speciation of organic carbon archived in Alpine ice cores: Implications for the long‐term change of organic aerosol over Europe
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DOI：
10.1002/jgrd.50202
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发表时间：
2013-05
期刊：
影响因子：
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通讯作者：
Michel Legrand;S. Preunkert;B. May;J. Guilhermet;H. Hoffman;D. Wagenbach
中科院分区：
文献类型：
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作者：
Michel Legrand;S. Preunkert;B. May;J. Guilhermet;H. Hoffman;D. Wagenbach
研究了1920-1988年间阿尔卑斯山冰芯中溶解有机碳(DOC)和一系列有机化合物。在此基础上，对欧洲大气中水溶性有机碳(WSOC)气溶胶的长期趋势进行了重建。结果表明，轻质一元和二元酸、类腐殖质和甲醛共占冰DOC含量的一半以上。DOC的这种扩展的化学形态被用来估计与WSOC气溶胶有关的冰中DOC的比例及其在过去的变化。据认为，第二次世界大战后，冬季和夏季的WSOC水平分别提高了2倍和3倍。在夏季，化石燃料对增加的贡献估计相当小，这表明它主要来自WSOC生物来源的增加。
Dissolved organic carbon (DOC) and an extended array of organic compounds were investigated in an Alpine ice core covering the 1920–1988 time period. Based on this, a reconstruction was made of the long‐term trends of water‐soluble organic carbon (WSOC) aerosol in the European atmosphere. It is shown that light mono‐ and dicarboxylates, humic‐like substances, and formaldehyde account together for more than half of the DOC content of ice. This extended chemical speciation of DOC is used to estimate the DOC fraction present in ice that is related to WSOC aerosol and its change over the past. It is suggested that after World War II, the WSOC levels have been enhanced by a factor of 2 and 3 in winter and summer, respectively. In summer, the fossil fuel contribution to the enhancement is estimated to be rather small, suggesting that it arises mainly from an increase in biogenic sources of WSOC.