Despite the known significant effect of the Changjiang River on the surface fugacity of CO₂ (fCO₂) in the northern East China Sea (ECS) during summer, the influence of the river on CO₂ uptake capacity has yet to be quantified. In this study, spatial variation in surface fCO₂ was studied in the northern ECS in August 2016. The controlling factors on surface fCO₂ were identified and quantified. Surface fCO₂, as influenced by the Changjiang River, was up to 250 μatm lower than that of oceanic surface water. Biological activity in the river-influenced region lowered surface fCO₂ 150 μatm–300 μatm below the physical mixing line of oceanic water with low-salinity and high-CO₂ Changjiang River water and contributed to CO₂ drawdown. The northern ECS was a CO₂ sink for the atmosphere, with an average CO₂ flux of −6.74 ± 2.89 mmol C m⁻² d⁻¹. The CO₂ uptake capacity was correlated with salinity, implying an importance of northeastward extension of Changjiang River plume, not the amount of the discharge.

尽管在夏季，长江对东海北部（ECS）的CO ₂（f CO ₂）的表面逸度产生了显着影响，但该河对CO ₂吸收能力的影响尚待定量。在这项研究中，2016年8月在北部ECS研究了表面f CO _2的空间变化。确定并量化了表面f CO ₂的控制因素。受长江影响，地表f CO ₂比海洋地表水低250μatm。河流影响地区地表生物活性降低f低于低盐度和高CO ₂长江水的海洋水物理混合线以下的CO ₂ 150 μatm–300μatm，并导致CO ₂下降。北部的ECS是大气中的CO ₂汇，平均CO ₂通量为-6.74±2.89 mmol C m ^-2 d ^-1。CO _2的吸收能力与盐度相关，这暗示了长江羽流向东北延伸的重要性，而不是排放量的重要性。