Large Reemergence of Anthropogenic Carbon into the Ocean’s Surface Mixed Layer Sustained by the Ocean’s Overturning Circulation
Large Reemergence of Anthropogenic Carbon into the Ocean’s Surface Mixed Layer Sustained by the Ocean’s Overturning Circulation
复制标题
由海洋翻转环流维持的人为碳大量重新出现到海洋表面混合层中
DOI：
10.1175/jcli-d-16-0725.1
复制
发表时间：
2017
影响因子：
4.9
通讯作者：
J. Sarmiento
中科院分区：
文献类型：
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作者：
K. Toyama;K. Rodgers;B. Blanke;D. Iudicone;M. Ishii;O. Aumont;J. Sarmiento
摘要我们评估了一个广泛使用的海洋碳循环模式的输出，以确定俯冲和仰冲（再现）率的人为碳（Cant）的气候条件在世界海洋环流实验（WOCE）时代在1995年使用一套新的拉格朗日诊断工具。拉格朗日诊断法的主要科学价值在于提供了一种新的手段，通过翻转环流将坎特重现路径与模式沃茨相对快速的更新时间尺度联系起来。我们的主要发现是，对于这个通过气体交换吸收Cant的2.04 PgC yr−1的模型，混合层底部（MLbase）的俯冲和仰冲速率分别为4.96和4.50 PgC yr−1，这是表面气体交换的两倍。考虑到混合层本身有0.17 PgC yr−1的净积累，这意味着穿过MLbase的1.40 PgC yr−1的剩余向下Cant输送与扩散有关。重要的是，th…
AbstractWe evaluate the output from a widely used ocean carbon cycle model to identify the subduction and obduction (reemergence) rates of anthropogenic carbon (Cant) for climatological conditions during the World Ocean Circulation Experiment (WOCE) era in 1995 using a new set of Lagrangian diagnostic tools. The principal scientific value of the Lagrangian diagnostics is in providing a new means to connect Cant reemergence pathways to the relatively rapid renewal time scales of mode waters through the overturning circulation. Our main finding is that for this model with 2.04 PgC yr−1 of uptake of Cant via gas exchange, the subduction and obduction rates across the base of the mixed layer (MLbase) are 4.96 and 4.50 PgC yr−1, respectively, which are twice as large as the gas exchange at the surface. Given that there is net accumulation of 0.17 PgC yr−1 in the mixed layer itself, this implies the residual downward Cant transport of 1.40 PgC yr−1 across the MLbase is associated with diffusion. Importantly, th...