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Characteristics of dimethylaminium and trimethylaminium in atmospheric particles ranging from supermicron to nanometer sizes over eutrophic marginal seas of China and oligotrophic open oceans

文献类型： 外文期刊

作者： Yu, Peiran 1 ; Hu, Qingjing 2 ; Li, Kai 3 ; Zhu, Yujiao 1 ; Liu, Xiaohuan 1 ; Gao, Huiwang 1 ; Yao, Xiaohong 1 ;

作者机构： 1.Ocean Univ China, Key Lab Marine Environm Sci & Ecol MoE, Qingdao 266100, Peoples R China

2.Chinese Acad Fisheries Sci, Yellow Sea Fisheries Res Inst, Key Lab Sustainable Utilizat Marine Fisheries Res, Qingdao 266071, Peoples R China

3.Natl Marine Environm Forecasting Ctr, Beijing 100081, Peoples R China

4.Qingdao Collaborat Ctr Marine Sci & Technol, Qingdao 266100, Peoples R China

关键词： Marine aerosol; Amines; Size distribution; NH4+; The Pacific Ocean

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2016 年 572 卷

页码：

收录情况： SCI

摘要： In this study, we characterized dimethylaminium(DMA(+)) and trimethylaminium(TMA(+)) in size-segregated atmospheric particles during three cruise campaigns in the marginal seas of China and one cruise campaign mainly in the northwest Pacific Ocean (NWPO). An 14-stage nano-MOUDI sampler was utilized for sampling atmospheric particles ranging from 18 mu m to 0.010 mu m. Among the four cruise campaigns, the highest concentrations of DMA(+) and TMA(+) in PM10 were observed over the South Yellow Sea (SYS) in August 2015, i.e., 0.76 +/- 0.12 nmol m(-3) for DMA(+) (average value +/- standard deviation) and 0.93 +/- 0.13 nmol m(-3) for TMA(+). The lowest values were observed over the NWPO in April 2015, i.e., 0.28 +/- 0.16 nmol m(-3) for DMA(+) and 0.22 +/- 0.12 nmol m(-3) for TMA(+). In general, size distributions of the two ions exhibited a bi-modal pattern, i.e., one mode at 0.01-0.1 mu m and the other at 0.1-1.8 mu m. The two ions' mode at 0.01-0.1 mu m was firstly observed. The mode was largely enhanced in samples collected over the SYS in August 2015, leading to high mole ratios of (DMA(+) + TMA(+))/NH4+ in PM0.1 (0.4 +/- 0.8, median value +/- standard deviation) and the ions' concentrations in PM0.1 accounting for similar to 10% and similar to 40% of their corresponding concentrations in PM10. This implied that (DMA(+) + TMA(+)) likely played an important role in neutralizing acidic species in the smaller particles. Using SO42-, NO3- and NH4+ as references, we confirm that the elevated concentrations of DMA(+) and TMA(+) in the 0.01-0.1 mu m size range were probably real signals rather than sampling artifacts. (C) 2016 Elsevier B.V. All rights reserved.

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