Mechanisms of Pacific Summer Water variability in the Arctic's Central Canada Basin
Mechanisms of Pacific Summer Water variability in the Arctic's Central Canada Basin
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DOI：
10.1002/2014jc010273
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发表时间：
2014-11-01
影响因子：
3.6
通讯作者：
Nishino, S.
中科院分区：
文献类型：
--
作者：
Timmermans, M. -L.;Proshutinsky, A.;Nishino, S.
太平洋水向北流经白令海峡，穿过北冰洋盐跃层，穿过北极的加拿大海盆部分。在夏季，太平洋夏季海水（PSW）在进入深海之前穿过楚科奇海浅水区时，会受到表面浮力通量和混合的影响。从冰系剖面仪，系泊，水文调查在2003年和2013年之间的测量揭示了空间和时间的变化，在加拿大中部盆地的盐跃层的PSW组件的综合热量和淡水含量的增加趋势，PSW层增厚的结果，以及层清新和变暖。它在这里示出如何在楚科奇海的性能在夏季控制PSW的温度-盐度特性在内部的潜没在楚科奇海露头isopycnals。海洋模式的结果，迫使理想化的风，提供支持的机制，表面海洋埃克曼输送辐合维持PSW通风的盐跃层。
Pacific Water flows northward through Bering Strait and penetrates the Arctic Ocean halocline throughout the Canadian Basin sector of the Arctic. In summer, Pacific Summer Water (PSW) is modified by surface buoyancy fluxes and mixing as it crosses the shallow Chukchi Sea before entering the deep ocean. Measurements from Ice-Tethered Profilers, moorings, and hydrographic surveys between 2003 and 2013 reveal spatial and temporal variability in the PSW component of the halocline in the Central Canada Basin with increasing trends in integrated heat and freshwater content, a consequence of PSW layer thickening as well as layer freshening and warming. It is shown here how properties in the Chukchi Sea in summer control the temperature-salinity properties of PSW in the interior by subduction at isopycnals that outcrop in the Chukchi Sea. Results of an ocean model, forced by idealized winds, provide support to the mechanism of surface ocean Ekman transport convergence maintaining PSW ventilation of the halocline.