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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >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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Glider observations of enhanced deep water upwelling at a shelf break canyon: A mechanism for cross-slope carbon and nutrient exchange

机译：滑架观测结果表明，深水上升沿架子破裂峡谷：横坡碳和养分交换的机制

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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 subpycnocline 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.
机译：使用水下滑翔机，我们已经确定了惠塔德峡谷附近峡谷穿越凯尔特海陆架断裂的上升流。这种上升流的出现似乎与局部斜坡电流的方向和强度有关，而局部斜坡电流本身是高度可变的。在典型的夏季赤道流期间，压力梯度力的不平衡以及由此引起的地转流的破坏会导致沿两个小型陆架断裂峡谷的主轴线上升。当斜率电流恢复为极向水流时，上升流停止，并且上升流特征的残留物混入当地的陆架水中或向远离该区域的方向平流。上升的特征是由架子上存在的亚青霉素高盐度水来识别的，并且从斜坡上300 m的深度向上隆起，从而提供了一种将营养物通过架子冲破运到架子上的机制。

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