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首页> 外文期刊>Journal of Physical Oceanography >Observations of Seasonal Upwelling and Downwelling in the Beaufort Sea Mediated by Sea Ice
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Observations of Seasonal Upwelling and Downwelling in the Beaufort Sea Mediated by Sea Ice

机译：海冰在波弗特海的季节性上升和下降趋势的观测

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摘要

We present observational estimates of Ekman pumping in the Beaufort Gyre region. Averaged over the Canada Basin, the results show a 2003-14 average of 2.3m yr(-1) downward with strong seasonal and interannual variability superimposed: monthly and yearly means range from 30m yr(-1) downward to 10m yr(-1) upward. A clear, seasonal cycle is evident with intense downwelling in autumn and upwelling during the winter months, despite the wind forcing being downwelling favorable year-round. Wintertime upwelling is associated with friction between the large-scale Beaufort Gyre ocean circulation and the surface ice pack and contrasts with previous estimates of yearlong downwelling; as a consequence, the yearly cumulative Ekman pumping over the gyre is significantly reduced. The spatial distribution of Ekman pumping is also modified, with the Beaufort Gyre region showing alternating, moderate upwelling and downwelling, while a more intense, yearlong downwelling averaging 18m yr(-1) is identified in the northern Chukchi Sea region. Implications of the results for understanding Arctic Ocean dynamics and change are discussed.
机译：我们提出了在博福特Gyre地区对Ekman抽水的观测估计。对加拿大盆地进行平均，结果显示2003-14年的平均年下降量为230万yr（-1），且季节性和年际变化具有很强的叠加性：月均和年均值范围从3,000万yr（-1）向下至1000万年（-1） ）向上。一个明显的季节性周期是明显的，秋季有强烈的下沉，而冬季则有上涌，尽管全年强风都在下沉。冬季上升流与大规模的Beaufort Gyre海洋环流和地表冰袋之间的摩擦有关，并且与先前估计的长达一年的下降流形成对比。结果，大大减少了回旋上的年度累积埃克曼抽水量。 Ekman抽水的空间分布也被修改，Beaufort Gyre地区显示出交替的，适度的上升流和下降流，而在楚科奇海北部地区，平均一年下来的强度更大，平均为18m yr（-1）。讨论了结果对理解北冰洋动力学和变化的意义。

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