在低营养海洋中,二氧化碳引起的酸化增加了短寿命的溴化碳氢化合物的生产

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Ya-Wen Zou, Cheng-Xuan Li, Qin-Sheng Wei, Qian-Yao Ma, Hui Ding, Xiao Meng Duan, Xing Zhai, Bao-Dong Wang
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引用次数: 0

摘要

海洋排放是溴化极短寿命物质(BrVSLs)进入大气的主要来源,这些物质对平流层臭氧化学有重要影响。调节BrVSLs的海洋生物地球化学过程往往对海洋酸化敏感。然而,BrVSLs生产对酸化的响应仍然知之甚少。本文在南大西洋和印度洋的三个站点通过船舶孵育实验研究了酸化对两种主要brvsl(二溴甲烷(CH2Br2)和三溴甲烷(CHBr3))产生的影响。3个站点在原地营养条件下,受酸化影响,CH2Br2和CHBr3的平均浓度分别升高了17.2 ~ 58.7%和14.3 ~ 80.3%,但不同区域的酸化机制存在差异。酸化导致溴过氧化物酶(BrPO)活性增加,促进了硅藻为主的东热带印度洋BrVSLs的释放。在热带大西洋东部,鞭毛藻占主导地位,溶解有机物(DOM)的反应性增强,酸化导致CHBr3增加。在浮游植物丰度较高的本格拉洋流沿岸,上述两种机制的综合作用导致酸化导致溴化极短寿命物质增加。然而,在营养和铁充足的营养和/或铁添加条件下,酸化并没有促进BrVSLs的产生,因为酸化对BrPO活性和DOM反应性的影响很小,部分原因是氧化应激增加的影响被浮游植物组成变化的影响所抵消。我们的研究为未来酸化对全球BrVSLs排放影响的建模提供了基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Carbon dioxide–induced acidification enhances short-lived brominated hydrocarbons production in oligotrophic oceans

Oceanic emission is a primary source of brominated very short-lived substances (BrVSLs) to the atmosphere, which have important effects on stratospheric ozone chemistry. Marine biogeochemical processes regulating BrVSLs are often sensitive to ocean acidification. Yet, the response of BrVSLs production to acidification remains poorly understood. Herein, the effects of acidification on the production of two main BrVSLs, dibromomethane (CH2Br2) and tribromomethane (CHBr3), were studied by ship-based incubation experiments at three stations in the South Atlantic and Indian Oceans. The average CH2Br2 and CHBr3 concentrations increased by 17.2–58.7% and 14.3–80.3% due to acidification under the in situ nutrient conditions with nutrient and/or iron limitation at the three stations, but the mechanisms driving these increases varied among different regions. The increased bromoperoxidase (BrPO) activity caused by acidification facilitated BrVSLs release in the Eastern Tropical Indian Ocean, where diatoms were dominant. CHBr3 increased due to acidification as a result of enhanced reactivity of dissolved organic matter (DOM) in the Eastern Tropical Atlantic, where dinoflagellates were dominant. Brominated very short-lived substances increased due to acidification as a result of a combined effect of the above two mechanisms in the Benguela Current Coastal with high phytoplankton abundance. Under the nutrient and/or iron addition conditions with nutrient and iron sufficiency, however, acidification did not promote BrVSLs production due to its only minor effect on the BrPO activity and reactivity of DOM, partly because the effect of increased oxidative stress was offset by that of changed phytoplankton composition. Our study provided a basis for future modeling on the impact of acidification on global BrVSLs emissions.

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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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