Mechanism for export of sediment‐derived iron in an upwelling regime
Mechanism for export of sediment‐derived iron in an upwelling regime
复制标题
上升流状态下沉积物衍生铁的输出机制
DOI：
10.1029/2011gl050366
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发表时间：
2012
影响因子：
5.2
通讯作者：
D. Archer
中科院分区：
文献类型：
--
作者：
S. Siedlecki;A. Mahadevan;D. Archer
使用东部边界上升流系统的三维高分辨率过程研究海洋模型进行模型模拟，用于描述在下降流有利风事件期间通过底部边界层（BBL）有效地将沉积物衍生的溶解铁输送到近海地下的机制。在模型中，当风有利时，来自沉积物的铁会积聚在外陆架的 BBL 中。当风逆转时，充满铁的 BBL 会混合到水柱中，并沿着与底部相交的等重线输送到近海。根据风反转的频率，陆架沉积物产生的铁通量的 10-50% 通过这条先前未识别的地下路径输出到近海。如果这种机制适用于所有沿海上升流状况，那么全球向公海出口的沉积物衍生的铁将相当于气溶胶中溶解铁的估计来源的十倍。
Model simulations performed with a three‐dimensional, high‐resolution, process study ocean model of eastern boundary upwelling systems are used to describe a mechanism that efficiently transports sediment‐derived dissolved iron offshore in the subsurface through the bottom boundary layer (BBL) during downwelling‐favorable wind events. In the model, sediment‐derived iron accumulates in the BBL on the outer shelf when the winds are upwelling‐favorable. When the wind reverses, the iron‐laden BBL is mixed into the water column and transported offshore along isopycnals that intersect the bottom. Depending on the frequency of wind reversal, between 10–50% of the shelf sediment‐derived iron flux is exported offshore through this previously unidentified subsurface pathway. If this mechanism operates on all coastal upwelling regimes, the global export of sediment‐derived iron to the open ocean would be equivalent to ten times larger than the estimated source of dissolved iron from aerosols.
南部非洲西缘富含有机物的泥浆：南大洋的营养源？
影响因子：
5.2
作者：
Compton;Herbert;Schneider
通讯作者：
Schneider