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利用234Th-238U不平衡方法研究南沙群岛海域春季真光层颗粒动力学性质,测定了4个站位水柱中颗粒态有机碳(POC)、溶解态及颗粒态234Th和238U的含量,讨论了各站位水柱中234Th/238U)A.R.的垂直分布。运用稳态箱式模型计算各站位不同水层中溶解态234Th相对于清除至颗粒物的平均停留时间和颗粒态234Th相对于迁出作用的平均停留时间。结合POC/234ThP比值,用两种方法估算出各站位的颗粒态有机碳输出通量分别为8.51—34.94和13.28—50.06mmol.(m2.d)-1。两种方法结果一致,说明234Th是表征POC循环的良好示踪剂。
The 234Th-238U unbalance method was used to study the particle dynamics of the true EUV in the Nansha Islands waters. The contents of particulate organic carbon (POC), dissolved and particulate 234Th and 238U in the four stations were measured. Vertical distribution of 234Th / 238U AR in water column. The steady-state box model was used to calculate the average residence time of 234Th dissolved in different water layers of each station with respect to the removal of particulate matter and the average residence time of 234Th relative to migration of granular state. Combined with the POC / 234ThP ratio, the output flux of particulate organic carbon at each station was estimated to be 8.51-34.94 and 13.28-50.06 mmol. (M2.d) -1 by two methods. The results of the two methods are consistent, indicating that 234Th is a good tracer for characterizing the POC cycle.