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于2005年6月对长江口23个站点的溶解性无机碳及其同位素组成进行了采样调查。结果发现长江河流区水体的pCO2均处于过饱和状态,但在进入河口区后发生大幅度的下降;δ13CDIC为-10.0‰～-0.9‰,且随盐度发生梯度性变化;DIC和δ13CDIC值偏离河水、海水混合线,显示了长江河口碳的复杂生物地球化学过程,包括内部碳酸盐岩体系及外部生物的作用:河流区主要受水-气界面CO2逸散的影响;河口区主要受光合作用的影响;海岸区则主要受碳酸盐类矿物沉淀作用的影响。
In June 2005, samples of dissolved inorganic carbon and its isotopic compositions at 23 sites in the Yangtze Estuary were sampled. The results showed that the pCO2 in the Yangtze River basin was in a supersaturated state, but dropped sharply after entering the estuary. The δ13CDIC was -10.0 ‰ -0.9 ‰, with the gradient changing with the salinity. The values of DIC and δ13CDIC deviated River water and seawater mixed line, showing the complex biogeochemical processes of carbon in the Yangtze River estuary, including the internal carbonate system and the role of external organisms: the river area is mainly affected by the CO2 emission from the water-air interface; the estuarine area is mainly affected by light cooperation However, the coastal area is mainly affected by the precipitation of carbonate minerals.