Occurrence and emission of non-methane hydrocarbons in the East China Sea: roles of phytoplankton assemblages

IF 2 4区环境科学与生态学 Q3 CHEMISTRY, ANALYTICAL Environmental Chemistry Pub Date : 2021-08-03 DOI:10.1071/en21066

Jian‐Long Li, Xing Zhai, Rong‐Liang Chen, Ying-Cui Wu, Hong‐Hai Zhang

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引用次数: 2

Abstract

Environmental context Marine-derived non-methane hydrocarbons (NMHCs) are thought to affect atmospheric oxidation balance and aerosol formation, hence playing an important role in regulating climate. In this study, we report the distributions and sea-to-air fluxes of 10 NMHCs in the East China Sea (ECS), and assess the roles of phytoplankton assemblages in the occurrence and emission of NMHCs in the ECS. The results will improve our understanding of the biogeochemical cycling of NMHCs in marine systems. Abstract Non-methane hydrocarbons (NMHCs) are important reactive trace-gases that are emitted from oceanic sources. However, it remains unclear how phytoplankton, either total biomass or specific species, affect the generation and emission of NMHCs. This study conducted field observations of NMHCs in the East China Sea (ECS) in autumn, 2014. The mean concentrations of ethane, propane, i-butane, n-butane, pentane, ethene, propene, 1-butene, 1-pentene and isoprene were 20.1 ± 3.6, 20.3 ± 20.2, 4.5 ± 0.9, 10.5 ± 2.3, 14.8 ± 3.4, 63.7 ± 20.8, 23.6 ± 6.6, 7.4 ± 2.9, 15.9 ± 4.3 and 69.4 ± 24.9 pmol L−1 respectively. Horizontal and vertical profiles of NMHCs showed that different water masses had distinct influences and the coastal areas had generally higher concentrations of NMHCs. There were significant positive correlations between alkanes or alkenes, which suggested that their production and fates in the surface seawater were similar. A significant positive correlation was observed between the isoprene and Chl-a concentrations, while no significant correlation was found between Chl-a and any other NMHCs. These results highlighted that, although NMHCs can be produced by phytoplankton, using Chl-a data or phytoplankton assemblages to estimate the production of other NMHCs in seawater is unreliable. Therefore, future research must determine the factors that control the production of these NMHCs. In addition, the results of estimated sea-to-air fluxes of NMHCs underscored the importance of the ECS as a source of NMHCs and the related atmospheric volatile organic compounds.

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中国东海非甲烷烃的赋存和排放:浮游植物组合的作用

海洋来源的非甲烷碳氢化合物(NMHCs)被认为影响大气氧化平衡和气溶胶形成，因此在调节气候中起着重要作用。本文报道了东海10种NMHCs的分布和海气通量，并评价了浮游植物组合在NMHCs发生和排放中的作用。研究结果将提高我们对海洋系统中NMHCs生物地球化学循环的认识。非甲烷碳氢化合物(NMHCs)是一种重要的海洋活性微量气体。然而，目前尚不清楚浮游植物(无论是总生物量还是特定种类)如何影响NMHCs的产生和排放。本研究于2014年秋季对东海NMHCs进行了野外观测。乙烷、丙烷、i-丁烷、正丁烷、戊烷、乙烯、丙烯、1-丁烯、1-戊烯和异戊二烯的平均浓度分别为20.1±3.6、20.3±20.2、4.5±0.9、10.5±2.3、14.8±3.4、63.7±20.8、23.6±6.6、7.4±2.9、15.9±4.3和69.4±24.9 pmol L−1。NMHCs水平和垂直剖面显示，不同水团对NMHCs的影响不同，沿海地区NMHCs浓度普遍较高。烷烃和烯烃之间存在显著的正相关关系，说明它们在表层海水中的产量和命运相似。异戊二烯与Chl-a浓度呈显著正相关，而Chl-a与其他nmhc浓度无显著相关。这些结果强调，尽管浮游植物可以产生NMHCs，但使用Chl-a数据或浮游植物组合来估计海水中其他NMHCs的产生是不可靠的。因此，未来的研究必须确定控制这些nmhc产生的因素。此外，估算NMHCs的海空通量的结果强调了ECS作为NMHCs和相关大气挥发性有机化合物来源的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environmental Chemistry 环境科学-分析化学

CiteScore

4.50

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： Environmental Chemistry publishes manuscripts addressing the chemistry of the environment (air, water, earth, and biota), including the behaviour and impacts of contaminants and other anthropogenic disturbances. The scope encompasses atmospheric chemistry, geochemistry and biogeochemistry, climate change, marine and freshwater chemistry, polar chemistry, fire chemistry, soil and sediment chemistry, and chemical aspects of ecotoxicology. Papers that take an interdisciplinary approach, while advancing our understanding of the linkages between chemistry and physical or biological processes, are particularly encouraged. While focusing on the publication of important original research and timely reviews, the journal also publishes essays and opinion pieces on issues of importance to environmental scientists, such as policy and funding. Papers should be written in a style that is accessible to those outside the field, as the readership will include - in addition to chemists - biologists, toxicologists, soil scientists, and workers from government and industrial institutions. All manuscripts are rigorously peer-reviewed and professionally copy-edited. Environmental Chemistry is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.