Wen Lilian, Ma Jun, Li Xuegang, Dai Jiajia, Song Jinming, Wang Qidong, Xu Kuidong, Xing Jianwei, Qu Baoxiao, Zhong Guorong
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; Laboratory for Marine Ecology and Environmental Science, Qingdao Marine Science and Technology Center, Qingdao, 266237, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, China.
Mar Environ Res. 2025 Feb;204:106916. doi: 10.1016/j.marenvres.2024.106916. Epub 2024 Dec 21.
This study analyzed the relationship between the oxygen minimum zone (OMZ) and various types of carbon, such as POC, DOC, and DIC, in the Y3 seamount area in the Western Pacific. The results indicated that the OMZ was located at 200-1000 m and a threshold of 100 μmol/kg was established for this area of the Western Pacific. The DOC and POC changed drastically out of OMZ while they were relatively stable within the OMZ due to the low oxygen. The rates of decrease in DOC and POC within the OMZ were significantly lower than those above the OMZ, indicating that the organic matter (OM) degradation rate within the OMZ was much lower than that above the OMZ. DIC maintained a continuously increasing trend with depth, but the DIC growth rate above, within, and below the OMZ decreased gradually. The controlling factors for the various types of carbon were different. POC was closely related to the decomposition of OM. The presence of recalcitrant organic carbon in DOC weakened the relationship between DOC and OM decomposition, and DIC components were complex and related to biological activity, temperature, and carbonate manifestation. This study explored the distribution of various types of carbon in the Western Pacific, providing support for studying the marine carbon cycle under a low-oxygen background.
本研究分析了西太平洋Y3海山区氧含量最小值区（OMZ）与不同类型碳（如颗粒有机碳（POC）、溶解有机碳（DOC）和溶解无机碳（DIC））之间的关系。结果表明，OMZ位于200 - 1000米处，并确定了西太平洋该区域100 μmol/kg的阈值。DOC和POC在OMZ之外变化剧烈，而在OMZ内由于低氧环境相对稳定。OMZ内DOC和POC的下降速率显著低于OMZ之上的区域，这表明OMZ内的有机物质（OM）降解速率远低于OMZ之上的区域。DIC随深度呈持续增加趋势，但OMZ之上、之内和之下的DIC增长率逐渐降低。不同类型碳的控制因素各不相同。POC与OM的分解密切相关。DOC中难降解有机碳的存在削弱了DOC与OM分解之间的关系，且DIC成分复杂，与生物活性、温度和碳酸盐表现有关。本研究探索了西太平洋不同类型碳的分布情况，为研究低氧背景下的海洋碳循环提供了支持。
