秋季北黄海北部海水文石饱和度分布特征及其调控因素

Distribution and controlling processes of seawater aragonite saturation state in the nearshore area of the North Yellow Sea in autumn

中文关键词:  文石饱和度  碳酸盐体系  近海酸化  河流输入  群落呼吸  北黄海

英文关键词:aragonite saturation state  carbonate system  coastal acidification  river input  community respiration  North Yellow Sea

中文摘要:

      本研究聚焦渔业资源丰富的北黄海北部海域，基于2022年10月的现场调查，分析了该海域海水文石饱和度（Ωarag）分布格局，采用双端元混合模型重点研究鸭绿江等河流输入及群落呼吸作用对海水Ωarag的调控作用。结果表明：秋季北黄海北部海水Ωarag较低，为1.02~2.34，Ωarag＜1.5的海域主要集中在鸭绿江口附近的东北部近岸海域及西南部离岸底层海域。鸭绿江等河流冲淡水的输入是北黄海北部近岸海水Ωarag降低的重要控制因素；而北黄海冷水团的低温耦合群落呼吸作用是北黄海北部底层海水Ωarag降低的重要控制因素；秋季随着北黄海冷水团减弱底层低Ωarag的海水与表层海水混合加强会致使表层海水Ωarag进一步降低，濒临生物钙质骨骼和外壳溶解的临界值。因此近海特别是河口附近海域是海洋酸化的敏感区。研究结果对于准确评估近海酸化的调控因子、发展趋势及制订科学有效的防治措施具有重要意义，也可为海水养殖业等规避低Ωarag的酸化海水的危害提供技术支撑。

英文摘要:

      Distribution and controlling processes of seawater aragonite saturation state (Ωarag) were investigated in the North Yellow Sea near the Yalu River estuary, based on surveys conducted in October 2022. The results revealed that seawater Ωarag values were relatively low, ranging from 1.02 to 2.34. Specifically, low values (Ωarag＜1.5) were observed at the Yalu River estuary and in bottom seawater affected by the Yellow Sea Cold Water Mass (YSCWM). Riverine inputs of diluted water contributed to the low Ωarag values in the nearshore areas, particularly near the Yalu River estuary. In contrast, the combined effects of the low-temperatures of the YSCWM and net community respiration/remineralization led to low bottom water Ωarag in the offshore areas. The results are crucial for accurately evaluating the trends and dynamics of coastal acidification and its synergistic effects on marine ecosystems. Furthermore, the results can provide technical support for seawater aquaculture and other industries to mitigate the harmful effects of acidified seawater.