Monocarboxylic and dicarboxylic acids over oceans from the East China Sea to the Arctic Ocean: Roles of ocean emissions, continental input and secondary formation
Monocarboxylic and dicarboxylic acids over oceans from the East China Sea to the Arctic Ocean: Roles of ocean emissions, continental input and secondary formation
复制标题
从东海到北冰洋海洋上空的一元羧酸和二元酸：海洋排放、大陆输入和二次形成的作用
DOI：
10.1016/j.scitotenv.2018.05.311
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发表时间：
2018-11-01
影响因子：
9.8
通讯作者：
Zhang, Pengfei
中科院分区：
文献类型：
--
作者：
Hu, Qihou;Xie, Zhouqing;Zhang, Pengfei
有机酸是海洋有机气溶胶的主要成分。人们对中低纬地区海洋中有机酸的赋存状态、来源和汇进行了大量研究。然而，对海洋，特别是高纬度地区特定来源对有机酸的相对贡献的了解仍然不够。本文测定了中国第三次北极科考期间东中国海至北冰洋边界层中的有机酸，包括C-14：0-C-32：0饱和单羧酸、C-16：1、C-18：1和C-18：2不饱和单羧酸，以及二-C-4-二-C-10二元酸。SMCA和SDCA的平均浓度分别为18+/-16 ng/m(3)和11+/-5.4 ng/m(3)。饱和MCAS含量明显高于不饱和DCA，峰值出现在C-16：0、C-18：0和C-14：0。DCAS在di-C-4达到峰值，其次是di-C-9和di-C-8。MCAS和DCA的浓度一般随着纬度的增加而降低。采用多元线性回归主成分分析(PCA-MLR)模型进一步研究了MCA和DCA的来源。总体而言，羧酸来自海洋排放、大陆输入(包括生物质燃烧、人为排放和陆地植物排放)和次生形成。所有五种来源都对MCAS做出了贡献，其中海洋排放是主要来源(48%)，其次是生物质燃烧(20%)。相比之下，只有3种来源(即50%的次生形态)、41%的人为排放和9%的生物质燃烧对DCA有贡献。此外，不同地区的污染源也不同。在北冰洋，只有二次形成和人为排放对MCAS和DCA有贡献。(C)2018爱思唯尔B.V.保留所有权利。
Organic acids are major components in marine organic aerosols. Many studies on the occurrence, sources and sinks of organic acids over oceans in the low and middle latitudes have been conducted. However, the understanding of relative contributions of specific sources to organic acids over oceans, especially in the high latitudes, is still inadequate. This study measured organic acids, including C-14:0 - C-32:0 saturated monocarboxylic acids (MCAs), C-16: 1, C-18: 1 and C-18: 2 unsaturated MCAs, and di-C-4 - di-C-10 dicarboxylic acids (DCAs), in the marine boundary layer from the East China Sea to the Arctic Ocean during the 3rd Chinese Arctic Research Expedition (CHINARE 08). The average concentrationswere 18 +/- 16 ng/m(3) and 11 +/- 5.4 ng/m(3) for SMCA and SDCA, respectively. The levels of saturated MCAs were much higher than those of unsaturated DCAs, with peaks at C-16: 0, C-18: 0 and C-14: 0. DCAs peaked at di-C-4, followed by di-C-9 and di-C-8. Concentrations of MCAs and DCAs generally decreased with increasing latitudes. Sources of MCAs and DCAs were further investigated using principal component analysis with a multiple linear regression (PCA - MLR) model. Overall, carboxylic acids originated from ocean emissions, continental input (including biomass burning, anthropogenic emissions and terrestrial plant emissions), and secondary formation. All the five sources contributed to MCAs with ocean emissions as the predominant source (48%), followed by biomass burning (20%). In contrast, only 3 sources (i.e., secondary formation 50%), anthropogenic emissions (41%) and biomass burning (9%)) contributed to DCAs. Furthermore, the sources varied with regions. Over the Arctic Ocean, only secondary formation and anthropogenic emissions contributed to MCAs and DCAs. (C) 2018 Elsevier B.V. All rights reserved.