Biotic and abiotic factors controlling isoprene, DMS, and oxygenated volatile organic compounds (VOCs) at the Southern Ocean in the Austral fall.

IF 3.3 3区 化学 Q2 CHEMISTRY, PHYSICAL
Saewung Kim, Roger Seco, Daun Jeong, Alex Guenther, Kitae Kim, Ahra Mo, Jung-Ok Choi, Jisoo Park, Keyhong Park
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引用次数: 0

Abstract

We present shipborne observations of volatile organic compounds such as dimethylsulfide (DMS), isoprene, acetaldehyde, acetone, and methanol over the Southern Ocean in April and May 2018. During the cruise, we encountered air masses influenced by the open ocean, coastal Antarctica, and sea ice. No direct correlation between oceanographic parameters and ambient distributions of VOCs is found. Nonetheless, the previously reported correlations among the observed VOCs are found in our observed dataset. The statistically meaningful (R2 > 0.2) anti-correlation of DMS with acetone and methanol is consistent with the previous report about biological activities associated with DMS emission and uptake of methanol and acetone. A positive correlation for isoprene and acetaldehyde, notably in the air masses originating from coastal Antarctica, indicates that photolysis of dissolved organic matter (DOM) was the likely source for the compounds when we conducted the observations. In addition, the observed VOCs were often enhanced over the sea ice observations. This can be accounted for by the ventilation processes of the dissolved VOCs under the ice.

控制南大洋南部秋季异戊二烯、DMS和含氧挥发性有机化合物(VOCs)的生物和非生物因素。
我们介绍了2018年4月和5月在南大洋上空对挥发性有机化合物(如二甲硫醚(DMS)、异戊二烯、乙醛、丙酮和甲醇)的船载观测结果。在航行过程中,我们遇到了受公海、南极沿海和海冰影响的气团。海洋学参数与VOCs的环境分布之间没有直接的相关性。尽管如此,在我们观察到的数据集中发现了先前报道的观察到的voc之间的相关性。DMS与丙酮和甲醇的负相关(R2 > 0.2)具有统计学意义,这与之前关于DMS排放和甲醇和丙酮吸收的生物活性相关的报道一致。异戊二烯和乙醛的正相关性,特别是在来自南极洲沿海的气团中,表明溶解有机物(DOM)的光解作用可能是我们进行观测时化合物的来源。此外,观测到的VOCs往往比海冰观测值增强。这可以通过冰下溶解的挥发性有机化合物的通风过程来解释。
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来源期刊
Faraday Discussions
Faraday Discussions 化学-物理化学
自引率
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发文量
259
期刊介绍: Discussion summary and research papers from discussion meetings that focus on rapidly developing areas of physical chemistry and its interfaces
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