Effect of anticyclonic eddies on the production and emission of marine dimethylsulfide in the northern South China Sea

IF 4 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Global and Planetary Change Pub Date : 2025-05-14 DOI:10.1016/j.gloplacha.2025.104883

Jin-Wei Wu , Feng Xu , Shi-Bo Yan , Gao-Bin Xu , Yu-Cheng Jiang , Xiao-Ran Li , Xing Zhai , Li-Min Zhou , Hong-Hai Zhang , Zhao-Hui Chen

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引用次数: 0

Abstract

Biogenic sulfide compounds, including dimethylsulfide (DMS), dimethylsulfoniopropionate (DMSP), and dimethylsulfoxide (DMSO), play a critical role in climate feedback and global sulfur cycles. Although the impact of mesoscale eddies on marine ecosystems is well established, their influence on sulfide compounds remains unclear. This study investigates the spatial distribution and key sink-source processes of DMS, DMSP, and DMSO in the South China Sea, a critical marginal sea of the western Pacific, during the summer of 2021, focusing on the influence of anticyclonic mesoscale eddies. We observed lower concentrations of these sulfides in the eddy core (for DMS, 1.80 ± 0.84 nmol L⁻¹, ranging from 0.66 to 2.95 nmol L⁻¹), whereas higher concentrations were found in the eddy edge (for DMS, 3.15 ± 2.17 nmol L⁻¹, ranging from 1.51 to 9.14 nmol L⁻¹). Notably, these compounds exhibited a distinct tendency to sink within the eddy core. This phenomenon can be attributed to the convergence and sinking of upper-layer water in the anticyclonic eddy core, which reduces nutrient availability in the upper layer, thereby affecting phytoplankton growth and altering the dominant species of phytoplankton. These changes in the phytoplankton community significantly impacted the source processes of DMS. The biological production rate of DMS was 53.3 % lower in the eddy core and 18.8 % higher at the eddy edge, compared to that in the reference sites. Furthermore, the difference between DMS production and total removal was largest at the eddy edge and smallest in the eddy core, shaping the observed DMS distribution pattern. Consequently, the diffusion of DMS from the sea to the atmosphere was reduced in the regions within the anticyclonic eddies. Our findings clarify the mechanisms through which mesoscale eddies affect the production and release of biogenic sulfides, underscoring the significant impact of mesoscale eddy processes on marine biogenic sulfides.

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反气旋涡旋对南海北部海洋二甲基硫化物产生和排放的影响

生物源硫化物，包括二甲基硫化物（DMS）、二甲基磺酰丙酸酯（DMSP）和二甲基亚砜（DMSO），在气候反馈和全球硫循环中发挥着关键作用。虽然中尺度涡旋对海洋生态系统的影响已经确定，但它们对硫化物的影响仍不清楚。本文研究了2021年夏季西太平洋关键边缘海南海DMS、DMSP和DMSO的空间分布和关键汇源过程，重点研究了反气旋中尺度涡旋的影响。我们观察到这些硫化物在涡流核心的浓度较低（DMS为1.80±0.84 nmol L−1，范围从0.66到2.95 nmol L−1），而在涡流边缘的浓度较高（DMS为3.15±2.17 nmol L−1，范围从1.51到9.14 nmol L−1）。值得注意的是，这些化合物表现出明显的下沉趋势。这一现象可能是由于反气旋涡旋核心的上层水体辐合下沉，降低了上层的养分有效性，从而影响了浮游植物的生长，改变了浮游植物的优势种。浮游植物群落的这些变化显著影响了DMS的来源过程。与参考位点相比，DMS在涡流中心的生物产率低53.3%，在涡流边缘的生物产率高18.8%。此外，DMS产生和总去除的差异在涡流边缘最大，在涡流核心最小，从而形成了观测到的DMS分布模式。因此，在反气旋涡旋区域内，DMS从海洋向大气的扩散减少。我们的研究结果阐明了中尺度涡旋影响生物硫化物产生和释放的机制，强调了中尺度涡旋过程对海洋生物硫化物的重要影响。

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

Global and Planetary Change 地学天文-地球科学综合

CiteScore

7.40

自引率

10.30%

发文量

226

审稿时长

63 days

期刊介绍： The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.