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测定了南沙海域一时间系列站 ｔ１， ｔ２时刻（相距 １２．３ ｄ）水柱各相态２３４Ｔｈ比活度及相关的水化学要素．结果发现真光层中溶解态２３４Ｔｈ比活度随时间的推移而降低，颗粒态２３４Ｔｈ比活度随时间的推移而升高，总２３４Ｔｈ比活度则几乎保持恒定，表明２３４Ｔｈ在溶解相与颗粒相两相间的快速转换．水柱总２３４Ｔｈ的垂直分布呈现“双亏损层”的分布模式．运用稳态不可逆清除模型估算出两个时间点上真光层的颗粒态有机碳（ＰＯＣ）输出通量，分别为４６．５和１３．１ｍｍｏｌＣ／ｍ２·ｄ．对ＰＯＣ输出通量的估算产生显著影响的不是２３４Ｔｈ清除模型而是真光层底部 ＰＯＣ／２３４Ｔｈｐ值的选取．
The specific activity of 234Th and related chemical elements of water in each phase of water column at t1 and t2 (12.3 d apart) in a time series of stations in Nansha sea area were measured. The results showed that the specific activity of 234Th in solution decreased with the passage of time. The specific activity of 234Th increased with the passage of time and the specific activity of 234Th almost remained constant. Rapid conversion between two phases. The vertical distribution of total 234Th of water column presents the distribution pattern of “double loss layer”. The steady-state irreversible removal model was used to estimate the POC flux of the euphotic layer at 46.5 and 13.1 mmol C / m2 · d, respectively. It is not the 234Th removal model but the selection of the POC / 234Thp value at the bottom of the euphotic layer that has a significant effect on the estimation of the POC output flux.