Frontogenesis and Variability in Denmark Strait and Its Influence on Overflow Water
Frontogenesis and Variability in Denmark Strait and Its Influence on Overflow Water
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丹麦海峡锋生、变率及其对溢流的影响
DOI：
10.1175/jpo-d-19-0053.1
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发表时间：
2019
影响因子：
3.5
通讯作者：
Almansi, Mattia
中科院分区：
文献类型：
--
作者：
Spall, Michael A.;Pickart, Robert S.;Lin, Peigen;Appen, Wilken-Jon von;Mastropole, Dana;Valdimarsson, H.;Haine, Thomas W. N.;Almansi, Mattia
一个高分辨率的数值模式，连同在现场和卫星观测，是用来探讨的性质和动态的主导高频（从一天到一周）的变化在丹麦海峡。在海峡中心的系泊测量显示，温暖的水“洪水事件”的发生，北冰岛Irminger电流（NIIC）传播离岸和平流亚热带起源的水向北通过最深的部分的窗台。丹麦海峡中的另外两种中尺度过程在文献中已有描述，称为“团”和“脉冲”，与溢流水界面的升高和降低有关。我们的测量结果表明，洪水事件发生在特别明显的脉冲。模式表明，NIIC水文锋是由大尺度气流锋生和斜压不稳定锋消之间的平衡维持的。具体而言，温度和盐度的趋势方程表明，涡的作用，以放松前，而平均流量的作用，以锐化it. Further，该模型揭示了两个密集的水过程-boluses和脉冲（因此洪水事件）-是动态相关的彼此和绑定到曲折的水文前在海峡。因此，我们的研究提供了一个一般的框架来解释短时间尺度的变化丹麦海峡溢流水进入Irminger海。
A high-resolution numerical model, together with in situ and satellite observations, is used to explore the nature and dynamics of the dominant high-frequency (from one day to one week) variability in Denmark Strait. Mooring measurements in the center of the strait reveal that warm water “flooding events” occur, whereby the North Icelandic Irminger Current (NIIC) propagates offshore and advects subtropical-origin water northward through the deepest part of the sill. Two other types of mesoscale processes in Denmark Strait have been described previously in the literature, known as “boluses” and “pulses,” associated with a raising and lowering of the overflow water interface. Our measurements reveal that flooding events occur in conjunction with especially pronounced pulses. The model indicates that the NIIC hydrographic front is maintained by a balance between frontogenesis by the large-scale flow and frontolysis by baroclinic instability. Specifically, the temperature and salinity tendency equations demonstrate that the eddies act to relax the front, while the mean flow acts to sharpen it. Furthermore, the model reveals that the two dense water processes—boluses and pulses (and hence flooding events)—are dynamically related to each other and tied to the meandering of the hydrographic front in the strait. Our study thus provides a general framework for interpreting the short-time-scale variability of Denmark Strait Overflow Water entering the Irminger Sea.
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影响因子：
3.5
作者：
Wilken‐Jon Appen;Dana Mastropole;R. Pickart;H. Valdimarsson;S. Jónsson;J. Girton
通讯作者：
J. Girton
声学观测揭示丹麦海峡溢流的时空结构
影响因子：
2.3
作者：
A. Macrander;R. Käse;U. Send;H. Valdimarsson;S. Jónsson
通讯作者：
S. Jónsson
影响因子：
3.5
作者：
J. McWilliams;M. Molemaker
通讯作者：
J. McWilliams;M. Molemaker
丹麦海峡溢流的水力估算
DOI：
--
发表时间：
2003
期刊：
影响因子：
--
作者：
A. Nikolopoulos;K. Borenäs;R. Hietala;P. Lundberg
通讯作者：
P. Lundberg
北冰岛急流在丹麦海峡溢流形成中的重要作用
DOI：
--
发表时间：
2011
期刊：
影响因子：
--
作者：
K. Våge;R. Pickart;M. Spall;H. Valdimarsson;S. Jónsson;D. Torres;S. Østerhus;T. Eldevik
通讯作者：
T. Eldevik