垂直集成采样法在^(234)Th—^(238)U不平衡研究海洋新生产力中的应用

Application of vertically integrated sampling approach to studyingnew production via 234Th -238U disequilibria

对基于梯形积分原理的集成采样法的可行性在理论上进行了阐述，并在厦门湾和南海北部的５个站位分别采集不同深度的水样和由这些水样按一定比例混合而成的集成水样进行了现场研究，结果表明两种采样方法经不可逆稳态清除模型得出的溶解态２３４Ｔｈ的清除通量、颗粒态２３４Ｔｈ的输出通量及溶解态、颗粒态２３４Ｔｈ的停留时间基本一致，证实了垂直集成采样法的可行性与可靠性．这种新的采样方案为今后充分发挥２３４Ｔｈ法的优势，在更大空间尺度上进行新生产力的研究提供了可靠的保证．

--The spatial and temporal distributions of new production vary largely in different sea areas. To understand the level ofnew production in the study sea area better, an estimate of new production must be obtained in large spatial and temporal scales.The disequilibrium of 234Th -- 238U is an effective method for studying new production. Two sampling projects, i. e., vertically integrated sampling approach(based on trapezoidal integration) and discrete layer sampling approach, are compared in the Xiamen Bayand the northern South China Sea. The coincident results from the two sampling approaches suggest that the vertically integratedsampling approach is not only effective and reliable, but also significantly reduces the number and volume of samples. It is allowed toestimate new production by 234Th -238U disequilibria in large spatial scale.