Observations of Hurricane Sandy from a glider mounted aquadopp profiler
Observations of Hurricane Sandy from a glider mounted aquadopp profiler
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发表时间：
2013-09
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通讯作者：
T. Miles;S. Glenn;J. Kohut;G. Seroka;Yi Xu
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作者：
T. Miles;S. Glenn;J. Kohut;G. Seroka;Yi Xu
近年来，中大西洋湾（MAB）经历了许多热带气旋和飓风，沿着纽约和新泽西海岸线造成了广泛的破坏。在此类事件发生之前了解沿海海洋对于准确预测风暴强度至关重要。由于夏季冷池的存在，在MAB上，夏季温度从表面到底部的变化超过14 °C。这些冰冷的底层沃茨有可能在风暴穿越浅大陆架时减弱风暴。尽管了解这些风暴观测之前和之下的动态非常重要，但极端条件限制了我们观察沿海海洋反应和潜在大气反馈的能力。为了解决沿海海洋的应对问题，我们在2012年10月美国历史上损失第二大的飓风桑迪之前部署了两架Teledyne-Webb Slocum滑翔机。其中一架滑翔机RU 23配备了Nortek Aquadopp电流剖面仪，并带有定制的滑翔机传感器头。在飓风桑迪之前，我们的两层跨大陆架流动与下降环流相一致。当下沉流锋被平流输送到近海经过滑翔机位置时，两层跨大陆架流转变为一层沿大陆架流。由于冷底层水的离岸平流，没有可用的冷水混合到表面，并在飓风桑迪穿过大陆架时减少其影响。
The Middle Atlantic Bight (MAB) has been experienced numerous extra-tropical cyclones and hurricanes in recent years that have cauased extensive damage along the New York and New Jersey coastlines. Understanding the coastal ocean ahead of such events is critical to accurately forecasting storm intensity. On the MAB in summer temperatures can vary by over 14 °C from the surface to bottom due to the presence of the summer Cold Pool. These cold bottom waters have the potential to weaken storms as they cross the shallow continental shelf. Despite the importance of understanding the dynamics ahead of and beneath these storms observations, the extreme conditions limit our ability to observe the coastal ocean response and potential atmospheric feedbacks. In order to resolve the coastal ocean response we deployed two Teledyne-Webb Slocum gliders ahead of Hurricane Sandy in October 2012, the second costliest hurricane in United States history. One glider, RU23, was equipped with a Nortek Aquadopp current profiler with a custom glider transducer head. Ahead of Hurricane Sandy we two-layer cross-shelf flow consisted with a downwelling circulation. As the downwelling front was advected offshore past the glider location two-layer cross-shelf flow shifted to one-layer along-shelf flow. With the offshore advection of cold bottom water there was no available cold water to mix to the surface and reduce the impact of Hurricane Sandy as it crossed the shelf.