Deep-water renewal in the northern North Atlantic
Deep-water renewal in the northern North Atlantic
复制标题
北大西洋北部的深水更新
作者：
R. R. Dickson;E. Gmitrowicz;A. Watson
世界海洋深水的更新是通过北大西洋北部和南极洲周围的稠密水的输入来完成的，但更新速度的直接测量被证明是难以捉摸的。在这里，我们描述了第一次成功的长期测量北部流入成分的运输，它沿着东格陵兰岛的大陆斜坡向南流动。在那里，我们观察到一个冷的、底部增强的、长坡流，最大速度约为100 cm s-1，平均速度高达2530 cm s-1，主要的波动时间尺度是几天，但速度或方向几乎没有季节性或年际变化。我们估计密度（σΘ）≥=27.80的输运稳定在10.7x 106 m3 s-1，并提出了整个北环流该密度的环流方案。
THE renewal of the deep water of the world's oceans is accomplished through the input of dense water in both the northern North Atlantic and around Antarctica but direct measurement of the renewal rate has proved elusive. Here we describe the first successful long-term measurement of the transport of the northern inflow component where it passes south along the Continental Slope off East Greenland. There we observe a cold, bottom-intensified, long-slope flow with maximum speeds of around 100 cm s-1, mean speeds of up to 2530 cm s-1, a dominant fluctuation timescale of a few days period but with little seasonal or interannual variation in speed or direction. We estimate the transport at densities (σΘ)≥=27.80 to be stable at 10.7x 106 m3 s-1 and propose a circulation scheme for waters of this density throughout the northern gyre.