Characteristics of an Advective Marine Heatwave in the Middle Atlantic Bight in Early 2017
Characteristics of an Advective Marine Heatwave in the Middle Atlantic Bight in Early 2017
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DOI：
10.3389/fmars.2019.00712
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发表时间：
2019-11-22
影响因子：
3.7
通讯作者：
Han, Lu
中科院分区：
文献类型：
--
作者：
Gawarkiewicz, Glen;Chen, Ke;Han, Lu
近年来，海洋热浪及其生态后果引起了广泛的兴趣。大多数分析都侧重于遥感海洋表面温度数据，因为它提供了时间和空间覆盖范围，以确定热浪的存在和持续时间。使用来自各种来源的水文数据，我们表明，平流海洋热浪是由2016年12月下旬新英格兰南部的一个事件引发的，温度异常测量高达6摄氏度，盐度异常超过1 PSU。2017年2月，在新泽西海域观察到类似的特征，这些特征与Shelfbreak Front从其正常位置迁移到大陆架中部或更远的岸上有关。2017年4月下旬，在哈特拉斯角以北30米等深线和大陆架上观测到34 PSU的陆架水。这些观测结果表明，2017年海洋热浪与强烈的正盐度异常有关，其总持续时间约为4个月，其平流路径沿中大西洋湾的大陆架延伸约850公里沿着。向南的平流速度意味着到达哈特拉斯角以北是一致的，与以前的估计沿大陆架速度的区域。这一海洋热浪的起源可能与跨大陆架平流有关，该平流是由新英格兰南部大陆架断裂附近的暖芯环驱动的。
There has been wide interest in Marine Heatwaves and their ecological consequences in recent years. Most analyses have focused on remotely sensed sea surface temperature data due to the temporal and spatial coverage it provides in order to establish the presence and duration of Heatwaves. Using hydrographic data from a variety of sources, we show that an advective Marine Heatwave was initiated by an event in late December of 2016 south of New England, with temperature anomalies measuring up to 6 degrees C and salinity anomalies exceeding 1 PSU. Similar features were observed off of New Jersey in February 2017, and are associated with the Shelfbreak Front migrating from its normal position to mid-shelf or further onshore. Shelf water of 34 PSU was observed just north of Cape Hatteras at the 30 m isobath and across the continental shelf in late April 2017. These observations reveal that the 2017 Marine Heatwave was associated with a strong positive salinity anomaly, that its total duration was approximately 4 months, and its advective path extended roughly 850 km along the length of the continental shelf in the Middle Atlantic Bight. The southward advective velocity implied by the arrival north of Cape Hatteras is consistent with previous estimates of alongshelf velocity for the region. The origin of this Marine Heatwave is likely related to cross-shelf advection driven by the presence of a Warm Core Ring adjacent to the shelfbreak south of New England.