Formation and circulation of newly ventilated winter water in the western Beaufort Sea
Formation and circulation of newly ventilated winter water in the western Beaufort Sea
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DOI：
10.1016/j.pocean.2023.103068
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发表时间：
2023-08
影响因子：
4.1
通讯作者：
Peigen Lin;R. Pickart;T. Weingartner;H. Simmons;M. Itoh;T. Kikuchi
中科院分区：
文献类型：
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作者：
Peigen Lin;R. Pickart;T. Weingartner;H. Simmons;M. Itoh;T. Kikuchi
新通风冬季水(NVWW)是一种寒冷、含盐、营养丰富的水团，对支持北冰洋西部的生态系统至关重要。在这项研究中，使用2008年至2009年部署在西经150°附近的波弗特海西部陆架和斜坡上的8个系泊阵列的时间序列记录了NVWW形成。冬季水中最咸(密度最大的)级别的水(盐度为32.6)，能够通风加拿大盆地内陆寒冷的盐跃层，仅在12月至5月的内陆架上观察到。这有三方面的原因：(1)中秋至深秋，外架上的水在很大程度上受到搁板附近较新鲜水的影响，限制了那里冬季产品的密度；(2)冬季期间，内架冰盖的变化明显高于外架，这种铅和多尼雅的存在导致更多的重新冻结，从而形成更咸的冬季水；(3)在寒冷的月份(12-5月)，跨架速度在阵列地点可以忽略不计。为了更好地了解西北偏西咸潮的最终命运，利用阵列数据加上西边的额外系泊数据，对西部波弗特海边界流系统的组成部分进行了量化。认为由于陆架西流和巴罗峡谷东流的汇聚，盐度较高的NVWW可以从陆架流出。
Newly ventilated winter water (NVWW) is a cold, salty, nutrient-rich water mass that is critical for supporting the ecosystem of the western Arctic Ocean. In this study, NVWW formation is documented using timeseries from an 8-mooring array deployed from 2008 to 2009 across the shelf and slope in the western Beaufort Sea near 150°W. The saltiest (densest) class of the winter water (salinity > 32.6), which is able to ventilate the cold halocline in the interior Canada Basin, was only observed on the inner shelf from December to May. The reasons for this are three-fold: (1) In mid- to late-fall the water on the outer shelf is largely influenced by fresher water in the vicinity of the shelfbreak, limiting the density of the winter product there; (2) during winter the variance in ice cover is significantly higher on the inner shelf than the outer shelf, and this enhanced presence of leads and polynyas results in more re-freezing and hence formation of saltier winter water; and (3) the cross-shelf velocities during the cold months (December–May) were negligible at the array site. To better understand the ultimate fate of the salty NVWW, the components of the western Beaufort Sea boundary current system were quantified using the array data plus additional mooring data to the west. It is argued that the salty NVWW can be fluxed off the shelf due to the convergence of the westward-flowing current on the shelf and the eastward-flowing outflow from Barrow Canyon.