Export of Middle Atlantic Bight Shelf Waters Near Cape Hatteras From Two Years of Underwater Glider Observations
Export of Middle Atlantic Bight Shelf Waters Near Cape Hatteras From Two Years of Underwater Glider Observations
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根据两年的水下滑翔机观测，哈特拉斯角附近的大西洋中部湾陆架水域的输出
DOI：
10.1029/2019jc016006
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
R. Todd
中科院分区：
文献类型：
--
作者：
R. Todd
中大西洋湾 (MAB) 陆架水域赤道流向北卡罗来纳州哈特拉斯角附近大陆架上流向极地的南大西洋湾陆架水域汇合，导致陆架水域净出口至深海。这种出口发生在靠近墨西哥湾流的地方，墨西哥湾流与哈特拉斯角附近的大陆边缘分开。 2017 年春季至 2019 年春季对哈特拉斯角北部斜坡和外大陆架进行持续水下滑翔机调查的观测结果用于研究该地区人与生物圈计划陆架水出口的平均值和变异性。 37°N 以南 MAB 陆架水的 0.3 Sv（1 Sv = 106 m3 s−1）时间平均出口量主要由离散出口事件主导； 50% 的出口发生在运输量高于平均值 1 个标准差以上的 17% 时间内。这些事件通常发生在这两年的春末和夏季，此时流入该地区的赤道流量达到峰值。 MAB 陆架水的输出与流入该区域的赤道流量相关，而流入该区域本身又与大陆架断裂处的密度梯度相关。对捕获人与生物圈计划陆架水出口极值的特定时间段内的观测进行了检查，以突出哈特拉斯地区陆架-深海交换情景的可变性。其中包括飓风驱动的近地表出口、墨西哥湾流北缘以下的地下出口以及长达数月的出口接近停止。简单语言摘要 北卡罗来纳州哈特拉斯角附近的沿海海洋环流的特点是中大西洋湾 (MAB) 和南大西洋湾的水域汇聚。由此产生的陆架水输出是在变化的风（包括经过的热带气旋）和变化的湾流强度以及大陆架向海位置的影响下发生的。作为了解控制哈特拉斯角大陆架和深海之间交换的物理过程的计划的一部分，自主水下滑翔机从 2017 年春季到 2019 年春季对哈特拉斯角以北的外大陆架和上大陆坡进行了勘察。这些观测结果用于描述该地区水文学和环流的平均和年度周期，并检查人与生物圈计划陆架水从大陆架出口的时间变化。 MAB 陆架水的时间平均出口量为 0.3 Sv（1 Sv = 106 m3 s−1），主要由这两年春末和夏季的出口事件主导。陆架水输出的变化与流入该区域的赤道流量的变化以及大陆架断裂处的密度梯度有关。为了展示该地区出口相关事件的多样性，研究了几个特定的时间段。
Equatorward flow of Middle Atlantic Bight (MAB) shelf waters meets poleward flowing South Atlantic Bight shelf waters over the continental shelf near Cape Hatteras, NC, leading to net export of shelf waters into the deep ocean. This export occurs in close proximity to the Gulf Stream, which separates from the continental margin near Cape Hatteras. Observations from sustained underwater glider surveys of the outer continental shelf and slope north of Cape Hatteras from spring 2017 to spring 2019 are used to examine the mean and variability of MAB shelf water export in the region. The 0.3 Sv (1 Sv = 106 m3 s−1) time-mean export of MAB shelf water south of 37◦N was dominated by discrete export events; 50% of export occurred during the 17% of the time during which transport was more than 1 standard deviation above the mean. These events typically occurred in late spring and summer of both years when equatorward flow into the region peaked. Export of MAB shelf water was correlated with equatorward flow into the region, which was itself correlated with the density gradient across the continental shelf break. Observations during specific time periods that capture extrema in MAB shelf water export are examined to highlight the variability in shelf-deep ocean exchange scenarios in the Hatteras region. These include near-surface export driven by hurricanes, subsurface export below the northern edge of the Gulf Stream, and a multi-month near-cessation of export. Plain Language Summary The coastal ocean circulation near Cape Hatteras, NC, is characterized by convergence of waters from the Middle Atlantic Bight (MAB) and South Atlantic Bight. The resulting shelf water export takes place under the influence of forcing by variable winds (including passing tropical cyclones) and variable Gulf Stream strength and position just seaward of the continental shelf. As part of a program to understand the physical processes controlling exchange between the continental shelf and deep ocean at Cape Hatteras, autonomous underwater gliders surveyed the outer continental shelf and upper continental slope north of Cape Hatteras from spring 2017 through spring 2019. These observations are used to characterize the mean and annual cycle of the hydrography and circulation in the region and to examine temporal variability in the export of MAB shelf waters from the shelf. Time-mean MAB shelf water export of 0.3 Sv (1 Sv = 106 m3 s−1) was dominated by export events in late spring and summer of both years. Variability in shelf water export was associated with variability in equatorward flow into the region and density gradients across the continental shelf break. To demonstrate the variety of export-related events in the region, several specific time periods are examined.
影响因子：
3.7
作者：
R. Todd;F. Chavez;S. Clayton;S. Cravatte;Marlos Goes;M. Graco;Xiaopei Lin;J. Sprintall;N. Zilberman;M. Archer;J. Arístegui;M. Balmaseda;J. Bane;M. Baringer;J. Barth;L. Beal;P Brandt;P. Calil;E. Campos;L. Centurioni;M. P. Chidichimo;M. Cirano;M. Cronin;E. Curchitser;R. Davis;M. Dengler;B. deYoung;S. Dong;R. Escribano;A. Fassbender;S. Fawcett;M. Feng;G. Goñi;A. Gray;D. Gutiérrez;D. Hebert;R. Hummels;S. Ito;Marjorlaine Krug;F. Lacan;L. Laurindo;A. Lazar;Craig M. Lee;M. Lengaigne;N. Levine;J. Middleton;I. Montes;M. Muglia;T. Nagai;H. Palevsky;J. Palter;H. Phillips;A. Piola;A. Plueddemann;B. Qiu;R. Rodrigues;M. Roughan;D. Rudnick;R. Rykaczewski;M. Saraceno;H. Seim;Alexander Sen Gupta;L. Shannon;B. Sloyan;A. Sutton;L. Thompson;A. V. D. Plas;D. Volkov;J. Wilkin;Dongxiao Zhang;Linlin Zhang
通讯作者：
R. Todd;F. Chavez;S. Clayton;S. Cravatte;Marlos Goes;M. Graco;Xiaopei Lin;J. Sprintall;N. Zilberman;M. Archer;J. Arístegui;M. Balmaseda;J. Bane;M. Baringer;J. Barth;L. Beal;P Brandt;P. Calil;E. Campos;L. Centurioni;M. P. Chidichimo;M. Cirano;M. Cronin;E. Curchitser;R. Davis;M. Dengler;B. deYoung;S. Dong;R. Escribano;A. Fassbender;S. Fawcett;M. Feng;G. Goñi;A. Gray;D. Gutiérrez;D. Hebert;R. Hummels;S. Ito;Marjorlaine Krug;F. Lacan;L. Laurindo;A. Lazar;Craig M. Lee;M. Lengaigne;N. Levine;J. Middleton;I. Montes;M. Muglia;T. Nagai;H. Palevsky;J. Palter;H. Phillips;A. Piola;A. Plueddemann;B. Qiu;R. Rodrigues;M. Roughan;D. Rudnick;R. Rykaczewski;M. Saraceno;H. Seim;Alexander Sen Gupta;L. Shannon;B. Sloyan;A. Sutton;L. Thompson;A. V. D. Plas;D. Volkov;J. Wilkin;Dongxiao Zhang;Linlin Zhang
配备多普勒电流剖面仪的自主水下滑翔机的绝对速度估计
影响因子：
2.2
作者：
Todd, Robert E.;Rudnick, Daniel L.;Sherman, Jeffrey T.;Owens, W. Brechner;George, Lawrence
通讯作者：
George, Lawrence
影响因子：
2.8
作者：
Gawarkiewicz, Glen;Todd, Robert E.;Dent, Margaret
通讯作者：
Dent, Margaret