Seasonal variation and origins of dicarboxylic acids in the marine atmosphere over the western North Pacific
Seasonal variation and origins of dicarboxylic acids in the marine atmosphere over the western North Pacific
复制标题
DOI：
10.1029/2002jd002355
复制
发表时间：
2003-03
影响因子：
--
通讯作者：
M. Mochida;A. Kawabata;K. Kawamura;H. Hatsushika;K. Yamazaki
中科院分区：
文献类型：
--
作者：
M. Mochida;A. Kawabata;K. Kawamura;H. Hatsushika;K. Yamazaki
[1]1990年4月至1993年11月，在西北太平洋的奇吉-吉马岛(27°04‘N，142°13’E)上空测量了同系物(C2-C11)二元酸的浓度。直链C2-C7二元酸以及一些支链、酮基和不饱和二元酸的月平均浓度在冬季到春季最高，夏季最低。而直链C8-C11二元酸则表现出相反的趋势，春季至夏季最高。主成分分析表明，C2-C7二元酸、邻苯二甲酸、部分酮二元酸和不饱和二元酸的贡献较大，而C8-C11二元酸似乎有另一种来源(S)。为了更好地了解二元酸的来源和来源区域，使用了反向轨迹和排放清单的组合模型。结果表明，西北太平洋大气中各种C2-C7二元酸的浓度主要受其排放和/或其前体排放的控制，其次是来自亚洲大陆的人为来源的排放，其次是远程大气输送。另一方面，较长链的二元酸不能用来自大陆区域的长距离大气传输来解释，这意味着来自自然来源的排放和/或形成，可能来自海洋。
[1] Concentrations of homologous (C2–C11) dicarboxylic acids were measured in the atmosphere over Chichi-jima Island (27°04′N, 142°13′E), western North Pacific, from April 1990 to November 1993. The monthly averaged concentrations of straight-chain C2–C7 dicarboxylic acids, and some branched, keto-, and unsaturated dicarboxylic acids showed a maximum in winter to spring and a minimum in the summer season. In contrast, straight-chain C8–C11 dicarboxylic acids showed an opposite trend with a maximum in spring to summer. Principal component analysis revealed that there is a source characterized by a strong contribution of C2–C7 dicarboxylic acids, phthalic acid, some keto-dicarboxylic acids, and unsaturated-dicarboxylic acids, whereas there seems to be another source(s) for the C8–C11 dicarboxylic acids. A combined model of backward trajectories and emission inventories was used to better understand the sources and source regions of the dicarboxylic acids. The results show that concentrations of various C2–C7 dicarboxylic acids in the western North Pacific atmosphere are largely controlled by their emissions and/or their precursor emissions from anthropogenic sources in the Asian continent, followed by long-range atmospheric transport. On the other hand, longer-chain dicarboxylic acids cannot be explained by long-range atmospheric transport from a continental region, which implies emissions and/or formation from natural sources, possibly from the ocean.