Glider observations of enhanced deep water upwelling at a shelf break canyon: A mechanism for cross-slope carbon and nutrient exchange

Glider observations of enhanced deep water upwelling at a shelf break canyon: A mechanism for cross-slope carbon and nutrient exchange
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滑翔机观测陆架断裂峡谷增强的深水上升流:跨坡碳和养分交换的机制

DOI:
10.1002/2016jc012087
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Porter M
Porter M
中科院分区:
--
文献类型:
--
作者:
Porter M

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使用水下滑翔机,我们已经确定了峡谷驱动的上升流穿过凯尔特海陆架-打破,在附近的Whittard峡谷。这种上升流的存在似乎与当地斜坡流的方向和强度有关,而斜坡流本身是高度可变的。在典型的夏季向赤道流动期间,不平衡的压力梯度力和由此产生的地转流的中断可导致沿两个小的陆架坡折峡谷的主轴沿着上涌。由于斜坡流恢复向极流,上升流停止和残余的上升流功能混合到当地的陆架水或平流远离该地区。上涌特征是通过在陆架上存在密度跃层以下的高盐度水来识别的,并且是从斜坡上300 m深处上涌的,从而提供了营养物穿过陆架断裂到陆架上的输送机制。
Using underwater gliders we have identified canyon driven upwelling across the Celtic Sea shelf‐break, in the vicinity of Whittard Canyon. The presence of this upwelling appears to be tied to the direction and strength of the local slope current, which is in itself highly variable. During typical summer time equatorward flow, an unbalanced pressure gradient force and the resulting disruption of geostrophic flow can lead to upwelling along the main axis of two small shelf break canyons. As the slope current reverts to poleward flow, the upwelling stops and the remnants of the upwelled features are mixed into the local shelf water or advected away from the region. The upwelled features are identified by the presence of sub‐pycnocline high salinity water on the shelf, and are upwelled from a depth of 300 m on the slope, thus providing a mechanism for the transport of nutrients across the shelf break onto the shelf.
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