中国海南岛东海岸上升流区颗粒有机物的碳氮同位素组成。
Carbon and nitrogen isotopic compositions of particulate organic matter in the upwelling zone off the east coast of Hainan Island, China.
机构信息
Institute of Marine Science, Shantou University, Shantou 515063, China; College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China.
College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China.
出版信息
Mar Pollut Bull. 2021 Jun;167:112349. doi: 10.1016/j.marpolbul.2021.112349. Epub 2021 Apr 14.
The isotopic compositions (δC and δN) and C/N ratios of suspended particulate organic matter (POM) were investigated off the east coast of Hainan Island in the South China Sea during summer. Coastal upwelling influenced the nearshore stations of transects S2 and S3, and higher δC and δN values suggested that coastal upwelling played a significant role in determining the POM sources. The POM at the nearshore area of transect S1 was controlled by the coastal current and freshwater discharge. Additionally, organic matter may be transported to the offshore area via tidal movements in transects S1 and S3. Based on the stable isotope analysis in an R model, the marine organic matter contribution in the upwelling area (19%) was higher than that in the other areas (transect S1 and the offshore area) (7%). The δC and δN values and C/N ratios reflect the carbon and nitrogen sources and their cycling in the upwelling zone off the east coast of Hainan Island.
本研究于夏季在南海海南岛东海岸外调查了悬浮颗粒有机物质（POM）的稳定同位素组成（δC 和 δN）和 C/N 比值。沿岸上升流影响了断面 S2 和 S3 的近岸站位，较高的 δC 和 δN 值表明，沿岸上升流在确定 POM 来源方面发挥了重要作用。断面 S1 近岸区的 POM 受沿岸流和淡水排放控制。此外，有机物质可能通过断面 S1 和 S3 的潮汐运动输送到近海区域。基于 R 模型中的稳定同位素分析，上升流区（19%）的海洋有机物质贡献高于其他区域（断面 S1 和远海区）（7%）。δC、δN 值和 C/N 比值反映了海南岛东海岸外上升流区的碳和氮源及其循环。
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