期刊
ATMOSPHERIC ENVIRONMENT
卷 43, 期 22-23, 页码 3489-3495出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2009.04.041
关键词
Formaldehyde; Acetaldehyde; Biogenic emission; Source apportionment; Isotopic composition
资金
- GIGCAS [IS-1060]
- Foundation of CAS [KZCX2-YW-403]
- NSFC [40590391, 40821003]
Formaldehyde and acetaldehyde are two most abundant carbonyls in ambient air. Biogenic emission has been proposed as a significant source other than anthropogenic emissions and atmospheric secondary formation. Here at a forest site in South China, the carbon isotopic compositions of formaldehyde and acetaldehyde emitted from leaves of three tree species (Litsea rotundifolia, Canarium album and Castanea henryi) were measured in comparison with the bulk carbon isotopic compositions of tree leaves. delta C-13 data of the emitted aldehydes (from -31 parts per thousand to -46 parts per thousand) were quite different for tree species, which were all more depleted in C-13 than the tree-leaf bulk delta C-13 values (from -27 parts per thousand to -32 parts per thousand). Formaldehyde in ambient air at the forest site had delta C-13 values different from those of leaf-emitted formaldehyde, indicating other sources for ambient formaldehyde apart from direct emission from leaves, most probably the photooxidation of biogenic hydrocarbon like isoprene and monoterpene. The delta C-13 differences of acetaldehyde between ambient data and those of tree leaves emission were less than 1 parts per thousand, implying direct biogenic emission as the dominant source. (C) 2009 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据