Na Rong, Rong Zengrui, Wang Zhaohui Aleck, Liang Shengkang, Liu Chunying, Ringham Mallory, Liang Haorui
College of Oceanic and Atmospheric Sciences, Ocean University of China, 238 Songling Road, Qingdao, China.
College of Oceanic and Atmospheric Sciences, Ocean University of China, 238 Songling Road, Qingdao, China; Frontier Science Center for Deep Ocean Multispheres and Earth System, Ocean University of China, 238 Songling Road, Qingdao, China.
Sci Total Environ. 2024 Jan 1;906:167572. doi: 10.1016/j.scitotenv.2023.167572. Epub 2023 Oct 6.
The East China Sea (ECS) has been reported to be a significant sink of atmospheric CO, but less is known about horizontal transport of dissolved inorganic carbon (DIC) across the shelf. A coupled physical-biogeochemical model has been implemented for the ECS to simulate the inorganic carbon system and estimate CO fluxes and cross-shelf DIC transport in the ECS. A 6-year model hindcast (2013-2018) was performed and assessed. Multiple existing datasets from in-situ observations are used to constrain and validate the model. The model reproduces the spatial and temporal patterns of nitrogen, chlorophyll and CO parameters in general agreement with observations. Modeling estimation reveals that the ECS takes up CO at an annual mean rate of about 8.20 ± 3.13 mmol m d, and experiences substantial seasonal variability. The total annual CO uptake in the ECS is about 21.55 Tg C yr. Modeling estimation suggests that the biological processes contribute to about 15 % of the shelf CO uptake in the ECS, leaving ~80 % of the shelf uptake contributed by other physical-chemical processes, e.g., physical pump and/or solubility pump. The horizontal fluxes of DIC between the ECS and the adjacent ocean are more than two orders of magnitude larger than the air-sea CO flux on the ECS and result in a net DIC export of about ~33.8 ± 14.87 Tg C yr from the shelf area. Modeling results suggest that this conveyance of DIC to the open ocean is equivalent to about 70 % of the inorganic carbon inflow from riverine and atmospheric pathways in the annual scale.
据报道，东海是大气中二氧化碳的一个重要汇，但对于溶解无机碳（DIC）跨陆架的水平输送情况了解较少。已针对东海实施了一个物理 - 生物地球化学耦合模型，以模拟无机碳系统，并估算东海的二氧化碳通量和跨陆架DIC输送。进行并评估了一个6年的模型后报（2013 - 2018年）。使用了多个来自现场观测的现有数据集来约束和验证该模型。该模型再现了氮、叶绿素和二氧化碳参数的时空模式，总体上与观测结果一致。模型估计表明，东海以约8.20±3.13 mmol m⁻² d⁻¹的年平均速率吸收二氧化碳，并且存在显著的季节变化。东海每年的总二氧化碳吸收量约为21.55 Tg C yr⁻¹。模型估计表明，生物过程对东海陆架二氧化碳吸收的贡献约为15%，其余约80%的陆架吸收量由其他物理化学过程贡献，例如物理泵和/或溶解度泵。东海与相邻海洋之间DIC的水平通量比东海海气二氧化碳通量大两个数量级以上，导致陆架区域每年有大约~33.8±14.87 Tg C yr⁻¹的DIC净输出。模型结果表明，在年尺度上，这种DIC向开阔海洋的输送量约相当于来自河流和大气途径的无机碳流入量的70%。
