College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, 524088, China; School of Chemistry and Environment, Guangdong Ocean University, Zhanjiang, 524088, China.
College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, 524088, China.
Mar Environ Res. 2024 Nov;202:106784. doi: 10.1016/j.marenvres.2024.106784. Epub 2024 Oct 11.
Typhoons greatly affect ocean hydrodynamics, thereby altering ocean productivity and biogeochemistry. This study used stable isotopes and geochemical indicators of particulate organic matter (POM) to investigate the impact of Typhoon Talim (2023) on marine productivity and POM dynamics in Zhanjiang Bay. During the typhoon, an ocean front formed in the upper bay, resulting in a nearly twofold increased POM and enhanced decomposition of resuspended POM, due to the strengthened vertical mixing. Despite of strong decomposition, the supplementation of terrestrial nutrient inputs maintained minimal changes in chlorophyll in the upper bay. By contrast, in the lower bay, chlorophyll and POM decreased significantly, primarily attributed to decomposition of fresh POM and nitrogen limitation resulting from high-salinity seawater intrusion induced by the typhoon. This study suggests that after typhoons, in the area where the ocean front forms, the decomposition degrades a large amount of resuspended POM, which is not conducive to the burial of organic carbon.
台风会对海洋水动力产生重大影响，从而改变海洋生产力和生物地球化学。本研究利用稳定同位素和颗粒有机物质（POM）的地球化学指标，研究了 2023 年台风“泰利”对湛江湾海洋生产力和 POM 动力过程的影响。在台风期间，在上湾形成了一个海洋锋面，导致 POM 增加近一倍，由于增强的垂直混合，悬浮再悬浮 POM 的分解作用增强。尽管分解作用很强，但陆地营养物质输入的补充使上湾的叶绿素基本保持不变。相比之下，在下湾，叶绿素和 POM 显著减少，主要归因于新鲜 POM 的分解和由台风引起的高盐度海水入侵导致的氮限制。本研究表明，在形成海洋锋面的区域，台风过后，分解作用会降解大量悬浮的 POM，这不利于有机碳的埋藏。
