The Effect of a Succession of Ocean Ventilation Changes on 14C
The Effect of a Succession of Ocean Ventilation Changes on 14C
复制标题
一系列海洋通风变化对 14C 的影响
DOI：
10.1017/s0033822200018233
复制
发表时间：
1997
期刊：
影响因子：
8.3
通讯作者：
D. Wright
中科院分区：
文献类型：
--
作者：
T. Stocker;D. Wright
利用Stacker和Wright（1996）的模式，我们研究了一系列海洋通风变化对大气放射性碳浓度、δ 14 Catm、表层水库年龄、顶部至底部年龄差异以及海洋不同区域的日历-14C年龄关系的影响。该模型包括14 C在大气、海洋和陆地生物圈中的循环。海洋通气量的变化是由流入北大西洋的淡水流量增加引起的，这是根据北大西洋区域融化率和气候状况之间的简单反馈机制确定的。结果表明，通气量的变化可引起δ 14 Catm的25%波动，表层水库年龄的波动在太平洋为100年（大西洋为200年），从上到下的年龄变化在太平洋为500年（大西洋为1000年）。我们还表明，14 C年龄估计的基础上，生活在海洋的近表面区域的海洋生物，并采取了表面14 C的信号可以导致明显的年龄反转，如果一个恒定的水库年龄的假设。
Using the model of Stacker and Wright (1996), we investigate the effect of a succession of ocean ventilation changes on the atmospheric concentration of radiocarbon, δ14Catm, the surface reservoir ages, the top-to-bottom age differences, and the calendar-14C age relationships in different regions of the ocean. The model includes a representation of the cycling of 14C through the atmosphere, the ocean and the land biosphere. Ocean ventilation changes are triggered by increasing rates of freshwater discharge into the North Atlantic, which are determined according to a simple feedback mechanism between the melting rates and the climatic state of the North Atlantic region. The results demonstrate that ventilation changes can cause δ14Catm fluctuations of 25%, surface reservoir age fluctuations of 100 yr in the Pacific (200 yr in the Atlantic) and top-to-bottom age variations of 500 yr in the Pacific (1000 yr in the Atlantic). We also show that 14C age estimates based on marine organisms that live in the near-surface region of the ocean and take up the signal of surface 14C can result in apparent age reversals if the assumption of a constant reservoir age is made.