Wen Lilian, Ma Jun, Li Xuegang, Dai Jiajia, Song Jinming, Wang Qidong, Yuan Huamao, Xing Jianwei, Qu Baoxiao
CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, China.
Mar Environ Res. 2025 May;207:107087. doi: 10.1016/j.marenvres.2025.107087. Epub 2025 Mar 18.
Marine hypoxia, exacerbated by global warming, has led to the expansion of oxygen minimum zone (OMZ) in the ocean. Based on investigations across four sections in the Tropical Western Pacific Ocean, this study examines the characteristics and key controlling factors of OMZ in the region, with a focus on the interactions between organic matter and hypoxia, using particulate organic carbon (POC) as an example. Results indicate that OMZ are located at depths of 550-1380 m, 290-1120 m, 740-1380 m, and 730-1380 m across the four sections, with a dissolved oxygen threshold of 3.2 mg/L. Seawater stratification plays a crucial role in defining OMZ distribution, with OMZ upper boundaries occurring below the halocline and minimum oxygen levels found beneath the thermocline. Ocean circulation facilitates the westward expansion of the intense OMZ from the Eastern Pacific, influencing its extent in the study area. OMZ enhance the transport of POC to the deep sea, with decomposition rates within OMZ significantly lower than in overlying waters, 17.7 %, 3.1 %, 3.7 %, and 13.6 % in sections A, B, C, and D, respectively. These findings provide valuable insights into the fundamental characteristics, drivers, and biogeochemical implications of OMZ in the Western Pacific.
全球变暖加剧了海洋缺氧现象，导致海洋中氧含量最低区域（OMZ）的扩大。基于对热带西太平洋四个断面的调查，本研究考察了该区域OMZ的特征及关键控制因素，重点以颗粒有机碳（POC）为例研究有机物与缺氧之间的相互作用。结果表明，四个断面的OMZ分别位于550 - 1380米、290 - 1120米、740 - 1380米和730 - 1380米深度处，溶解氧阈值为3.2毫克/升。海水层化在界定OMZ分布方面起着关键作用，OMZ的上边界出现在盐跃层下方，最低氧含量出现在温跃层下方。海洋环流促进了强烈的OMZ从东太平洋向西扩展，影响其在研究区域的范围。OMZ增强了POC向深海的输送，OMZ内的分解速率显著低于上覆水体，在断面A、B、C和D中分别为17.7%、3.1%、3.7%和13.6%。这些发现为西太平洋OMZ的基本特征、驱动因素和生物地球化学影响提供了有价值的见解。
