Distribution of Upper Circumpolar Deep Water on the warming continental shelf of the West Antarctic Peninsula
Distribution of Upper Circumpolar Deep Water on the warming continental shelf of the West Antarctic Peninsula
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DOI：
10.1002/2017jc012840
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发表时间：
2017-07-01
影响因子：
3.6
通讯作者：
Schofield, Oscar
中科院分区：
文献类型：
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作者：
Couto, Nicole;Martinson, Douglas G.;Schofield, Oscar
我们使用自主水下航行器的空间分布特征的上绕极深水（UCDW）的西南极半岛（WAP）的大陆架上，并提出了第一个近天气测量的中尺度功能（涡）包含UCDW的WAP。在四个滑翔机部署过程中，探测到了33个宽度约为10公里的地下涡流。每个涡流对次密度跃层沃茨的贡献平均为5.8 x 10（16）J，其中需要1.37 x 10（19）J/年（-1）的跨大陆架热通量来平衡热量向上覆冬季水域和近海岸沃茨的扩散损失。到达大陆架的热量大约有三分之二穿过密度跃层扩散，三分之一扩散到沿海沃茨;次密度跃层沃茨的长期变暖是这种平衡的一小部分。百分之六十的配置文件，包含UCDW的相干涡流的一部分。20%和53%之间的横向陆上热通量的WAP可以归因于涡旋进入玛格丽特槽，在大陆架的南部的一个功能，这是已知的是一个重要的管道UCDW。一个北方槽被确定为额外的重要位置的涡流入侵。
We use autonomous underwater vehicles to characterize the spatial distribution of Upper Circumpolar Deep Water (UCDW) on the continental shelf of the West Antarctic Peninsula (WAP) and present the first near-synoptic measurements of mesoscale features (eddies) containing UCDW on the WAP. Thirty-three subsurface eddies with widths on the order of 10 km were detected during four glider deployments. Each eddy contributed an average of 5.8 x 10(16) J to the subpycnocline waters, where a cross-shelf heat flux of 1.37 x 10(19) J yr(-1) is required to balance the diffusive loss of heat to overlying winter water and to the near-coastal waters. Approximately two-thirds of the heat coming onto the shelf diffuses across the pycnocline and one-third diffuses to the coastal waters; long-term warming of the subpycnocline waters is a small residual of this balance. Sixty percent of the profiles that contained UCDW were part of a coherent eddy. Between 20% and 53% of the lateral onshore heat flux to the WAP can be attributed to eddies entering Marguerite Trough, a feature in the southern part of the shelf which is known to be an important conduit for UCDW. A northern trough is identified as additional important location for eddy intrusion.