Short-Term Variability of Atmospheric DMS and Its Oxidation Products at Amsterdam Island during Summer Time
Short-Term Variability of Atmospheric DMS and Its Oxidation Products at Amsterdam Island during Summer Time
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阿姆斯特丹岛夏季大气 DMS 及其氧化产物的短期变化
DOI：
10.1023/a:1010631305307
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发表时间：
2001
影响因子：
2
通讯作者：
N. Mihalopoulos
中科院分区：
文献类型：
--
作者：
J. Sciare;E. Baboukas;N. Mihalopoulos
1998年1月在阿姆斯特丹岛进行了为期一个月的实验，研究中纬度偏远海洋大气中二甲硫醚（DMS）及其氧化产物短期变化的控制因素。在本实验中观察到 DMS、二氧化硫 (SO2) 和二甲亚砜 (DMSO) 的高混合比，平均浓度分别为 395 万亿体积份 (pptv)（标准差，σ = 285，n = 500）、114 pptv（σ = 125，n = 12）和 3 pptv（σ = 1.2，n = 167）。风速和风向被确定为控制大气 DMS 水平的主要因素。研究发现，气温/气团来源的变化会对二甲亚砜 (DMSO)/DMS 和 SO2/DMS 摩尔比产生强烈影响，这与最近的实验室数据一致。本实验期间气溶胶中甲磺酸 (MSA) 和非海盐硫酸盐 (nss-SO42−) 的平均浓度分别为 12.2± 6.5 pptv (1σ, n=47) 和 59 ± 33 pptv (1σ, n=47)。据报道，在通过额叶通道后，注入了缺乏水分、富含臭氧的空气，出现了垂直夹带的证据。在这些事件期间计算出高 MSA/ nss-SO42− 摩尔比（平均值 0.44）。最后，在通过额叶之后，还观察到了少数凝聚核（CN）浓度的斑点。
A one-month experiment was performed at Amsterdam Island in January 1998, to investigate the factors controlling the short-term variations of atmospheric dimethylsulfide (DMS) and its oxidation products in the mid-latitudes remote marine atmosphere. High mixing ratios of DMS, sulfur dioxide (SO2) and dimethylsulfoxide (DMSO) have been observed during this experiment, with mean concentrations of 395 parts per trillion by volume (pptv) (standard deviation, σ = 285, n = 500), 114 pptv (σ = 125, n = 12) and 3 pptv (σ = 1.2, n = 167), respectively. Wind speed and direction were identified as the major factors controlling atmospheric DMS levels. Changes in air temperature/air masses origin were found to strongly influence the dimethylsulfoxide (DMSO)/DMS and SO2/DMS molar ratios, in line with recent laboratory data. Methanesulfonic acid (MSA) and non-sea-salt sulfate (nss-SO42−) mean concentrations in aerosols during this experiment were 12.2± 6.5 pptv (1σ, n=47) and 59 ± 33 pptv (1σ, n=47), respectively. Evidence of vertical entrainment was reported following frontal passages, with injection of moisture-poor, ozone-rich air. High MSA/ nss-SO42− molar ratios (mean 0.44) were calculated during these events. Finally following frontal passages, few spots in condensation nuclei (CN) concentration were also observed.