Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, PR China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, PR China; School of Marine Science and Policy, University of Delaware, Newark, DE 19716, United States.
Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, PR China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, PR China.
Sci Total Environ. 2021 Jul 20;779:146376. doi: 10.1016/j.scitotenv.2021.146376. Epub 2021 Mar 16.
Marginal seas are highly productive and disproportionately large contributors to global air-sea CO fluxes. Due to complex physical and biogeochemical conditions, the southern Yellow-East China Sea is an ideal site for studying carbonate chemistry variability. The carbonate system was investigated in the area in spring of 2017 and summer of 2018. Dissolved inorganic carbon (DIC) and total alkalinity (TA) concentrations were higher in the SYS than the ECS due to material from carbonate weathering and erosion carried by the Yellow River. High pH and low DIC and TA were observed in the Zhe-Min Coastal Current in spring due to high primary productivity caused by Changjiang River input and the Taiwan Warm Current. Temperature and biological activity were the primary drivers controlling the partial pressure of CO (pCO) in the SYS, pCO was controlled by primary productivity related to nutrients carried by the Changjiang River and physical mixing in the Changjiang River plume and inner/middle shelves of the ECS, whereas temperature was the dominant factor determining pCO distributions in the ECS outer shelf waters influenced by the Kuroshio Current. Overall, the entire study area shifted from a CO sink (-4.18 ± 5.60 mmol m d) to a weak source (1.02 ± 4.87 mmol m d) from spring to summer. Specifically, the SYS and ECS offshore waters changed from CO sinks in spring to sources in summer, while the Changjiang River plume was always a CO sink.
边缘海具有很高的生产力，对全球海气 CO 通量的贡献不成比例。由于复杂的物理和生物地球化学条件，南黄海是研究碳酸盐化学变化的理想地点。该碳酸盐系统于 2017 年春季和 2018 年夏季进行了调查。由于黄河携带的碳酸盐风化和侵蚀物质，东海的溶解无机碳 (DIC) 和总碱度 (TA) 浓度高于南海。春季浙闽沿岸流中观测到高 pH 值、低 DIC 和 TA，这是由于长江输入和台湾暖流导致的高初级生产力所致。温度和生物活性是控制南海部分压力 CO (pCO) 的主要驱动因素，pCO 受长江携带的营养物质和长江羽流及东海内/中陆架的物理混合所驱动的初级生产力控制，而温度是受黑潮影响的东海外陆架水域 pCO 分布的主导因素。总的来说，整个研究区从春季的 CO 汇（-4.18±5.60mmol m d）转变为夏季的弱源（1.02±4.87mmol m d）。具体而言，南海和东海外海海域从春季的 CO 汇转变为夏季的 CO 源，而长江羽流始终是 CO 汇。
