Arctic Sea Level and Surface Circulation Response to the Arctic Oscillation
Arctic Sea Level and Surface Circulation Response to the Arctic Oscillation
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DOI：
10.1029/2018gl078386
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发表时间：
2018-07-16
影响因子：
5.2
通讯作者：
Kwok, Ron
中科院分区：
文献类型：
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作者：
Armitage, Thomas W. K.;Bacon, Sheldon;Kwok, Ron
北极涛动（AO）是热带外北方大气变化的主要模态，影响地面气压、风、温度和降水。在这里，我们使用了2003-2014年的高度计海平面记录，覆盖了冰覆盖和无冰的海洋，以研究AO对北极海平面和表面地转环流的影响。AO驱动的沿岸风异常驱动跨大陆架Ekman运输和相反的正压海平面异常之间的陆架海和北冰洋的深盆，最大海平面异常的差异，在货架打破类似于3厘米每单位AO指数。这种海平面变化模式产生地形导向（通常沿大陆架）电流异常约0.5厘米/秒每单位AO指数。AO驱动的风变率调节与大西洋和太平洋水流入相关的表面流，在巴伦支海开口和白令海峡之间有相反的流入异常。简明语言概要北极涛动控制着北纬20度以北的大尺度气压、风、温度和降水的变化。这项研究使用卫星测量来调查北极涛动对北冰洋海平面和上层洋流的影响。与北极涛动相关的风导致海平面在浅海沿海陆架海上升，在深海下降，反之亦然，这取决于北极涛动是处于正相位还是负相位。这些海平面模式驱动着通常沿着大陆架边缘流动的洋流。北极涛动还影响了与通过巴伦支海流入的大西洋水和通过白令海峡流入的太平洋水相关的海流强度。
The Arctic Oscillation (AO) is the leading mode of extratropical northern hemisphere atmospheric variability, affecting surface pressure, winds, temperature, and precipitation. Here we use an altimeter sea level record spanning 2003-2014, covering the ice-covered and ice-free ocean, to examine the influence of the AO on Arctic sea level and surface geostrophic circulation. AO-driven alongshore wind anomalies drive cross-shelf Ekman transport and opposing barotropic sea level anomalies between the shelf seas and deep basins of the Arctic Ocean, with maximum sea level anomaly differences across the shelf-break of similar to 3 cm per unit AO index. This pattern of sea level variability generates topographically steered (generally along-shelf) current anomalies of around 0.5 cm/s per unit AO index. AO-driven wind variability modulates surface currents associated with Atlantic and Pacific water inflow, with opposing inflow anomalies between the Barents Sea Opening and Bering Strait.Plain Language Summary The Arctic Oscillation dominates large-scale changes in atmospheric pressure, wind, temperature, and precipitation north of 20 degrees N. This study uses satellite measurements to investigate the impact the Arctic Oscillation has on sea level and upper ocean currents in the Arctic Ocean. Winds associated with the Arctic Oscillation cause sea levels to rise in the shallow coastal shelf seas, and drop in the deeper ocean, or vice versa, depending if the Arctic Oscillation is in a positive or negative phase. These sea level patterns drive currents which generally follow the edge of the continental shelf. The Arctic Oscillation also influences the strength of the currents associated with the inflow of Atlantic Water through the Barents Sea and the inflow Pacific Water through the Bering Strait.