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Contribution of Changjiang River discharge to CO2 uptake capacity of the northern East China Sea in August 2016
Continental Shelf Research ( IF 2.1 ) Pub Date : 2021-01-13 , DOI: 10.1016/j.csr.2020.104336
Yujeong Choi , Dongseon Kim , Jae Hoon Noh , Dong-Jin Kang

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.



中文翻译:

2016年8月长江排放对东海北部北部CO 2吸收能力的贡献

尽管在夏季,长江对东海北部(ECS)的CO 2f 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。

更新日期:2021-01-18
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