The Changing Nature of Shelf-Break Exchange Revealed by the OOI Pioneer Array
The Changing Nature of Shelf-Break Exchange Revealed by the OOI Pioneer Array
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DOI：
10.5670/oceanog.2018.110
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发表时间：
2018-03-01
期刊：
影响因子：
2.8
通讯作者：
Dent, Margaret
中科院分区：
文献类型：
--
作者：
Gawarkiewicz, Glen;Todd, Robert E.;Dent, Margaret
虽然大陆架和斜坡南部的新英格兰一直是最近的研究，解决十年尺度变暖和水团性质的年际变化的主题，这是不太清楚这些变化如何影响陆架断裂交换过程。近年来，海洋观测站倡议先锋阵列和其他区域观测方案对异常大陆架和斜坡状况的观测表明，暖咸沃茨向岸侵入的现象越来越普遍。从2014年4月到2016年12月收集的先锋阵列滑翔机观测数据构建的平均跨大陆架断面表明，斜坡沃茨一直更温暖，更咸。我们使用先锋阵列和其他来源的观测结果，研究了2014年春季和2017年冬季位于陆架断裂附近的温暖核心环的陆架断裂交换事件和温暖咸水的异常陆上入侵。我们还描述了2014年9月环水的另一次跨大陆架入侵，以证明跨大陆架延伸的高盐度沃茨的出现是罕见的。先锋阵列和其他来源的观测表明，温暖的核心环和墨西哥湾流水团比过去几十年更频繁地侵入大陆架，并向岸上渗透得更深。
Although the continental shelf and slope south of New England have been the subject of recent studies that address decadal-scale warming and interannual variability of water mass properties, it is not well understood how these changes affect shelf-break exchange processes. In recent years, observations of anomalous shelf and slope conditions obtained from the Ocean Observatories Initiative Pioneer Array and other regional observing programs suggest that onshore intrusions of warm, salty waters are becoming more prevalent. Mean cross-shelf transects constructed from Pioneer Array glider observations collected from April 2014 through December 2016 indicate that slope waters have been warmer and saltier. We examine shelf-break exchange events and anomalous onshore intrusions of warm, salty water associated with warm core rings located near the shelf break in spring 2014 and winter 2017 using observations from the Pioneer Array and other sources. We also describe an additional cross-shelf intrusion of ring water in September 2014 to demonstrate that the occurrence of high-salinity waters extending across the continental shelf is rare. Observations from the Pioneer Array and other sources show warm core ring and Gulf Stream water masses intrude onto the continental shelf more frequently and penetrate further onshore than in previous decades.