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为了研究楚科奇海生物泵过程,利用234Th示踪法估算了该海区真光层颗粒有机碳的输出通量。测定了中国第2次北极考察期间获得的楚科奇海测站海水样品中溶解态及颗粒态234Th、238U和颗粒有机碳的含量。基于上层水体中234Th与238U的不平衡并结合一维稳态不可逆清除模型,估算出了真光层中溶解态234Th的清除速率、颗粒态234Th的迁出速率、234Th的平均停留时间等颗粒动力学参数以及颗粒有机碳的输出通量和ThE比值(颗粒有机碳输出通量和初级生产力的比值)。楚科奇海具有较高的颗粒有机碳输出通量和很高的ThE比值,生物泵运转活跃,是全球碳循环的重要汇区。
In order to study the Chukchi Sea biopump process, the 234Th tracer method was used to estimate the output flux of particulate organic carbon in the true photoperiod of the sea. The dissolved and particulate 234Th, 238U and particulate organic carbon in the Chukchi Sea Station obtained during the 2nd Arctic expedition in China were measured. Based on the imbalance of 234Th and 238U in the upper water and the one-dimensional steady-state irreversible removal model, the particle kinetics of 234Th dissolved state, 234Th granular outflow rate and 234Th average residence time were estimated. Parameters, and the output flux of particulate organic carbon and the ThE ratio (ratio of particulate organic carbon output flux to primary productivity). The Chukchi Sea has a high particulate organic carbon output flux and a high ThE ratio. The biological pump is actively operating and is an important sink for the global carbon cycle.