Coastal Trapped Waves and Other Subinertial Variability along the Southeast Greenland Coast in a Realistic Numerical Simulation
Coastal Trapped Waves and Other Subinertial Variability along the Southeast Greenland Coast in a Realistic Numerical Simulation
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现实数值模拟中格陵兰东南部海岸的沿海陷波和其他亚惯性变率
DOI：
10.1175/jpo-d-20-0239.1
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发表时间：
2021
影响因子：
3.5
通讯作者：
Almansi, Mattia
中科院分区：
文献类型：
--
作者：
Gelderloos, Renske;Haine, Thomas W.;Almansi, Mattia
格陵兰东南沿海沿着的洋流在气候系统中起着重要作用。它们携带着稠密的水越过丹麦海峡的岩床，将来自北极和格陵兰冰盖的淡水带入亚极地海洋，并将温暖的大西洋海水带入格陵兰峡湾，在那里它可以与出口冰川相互作用。系泊观测证据表明，该区域的环流显示出相当大的亚惯性变率（通常周期为几天）。对于稠密的水流过丹麦海峡的窗台，这种变化增强了时间平均运输。有人认为，观测中发现的亚惯性变率与沿海被困波有关，其性质取决于水深、分层和平均流。在这里，我们使用的输出高分辨率的现实模拟诊断和表征亚惯性变化的海面高度和速度沿着海岸。结果表明，沿大陆架沿着数百公里的亚惯性信号是相干的。我们发现沿海被困波上的货架和沿着货架打破在两个亚惯性频率带，在1-3和5-18天的周期是一致的模式I波和更高的模式的组合。此外，我们发现东北屏障风可能会引发5-18天的陆棚波，而1-3天的变化与塞尔米利克深海的高风速有关。
Ocean currents along the southeast Greenland coast play an important role in the climate system. They carry dense water over the Denmark Strait sill, freshwater from the Arctic and the Greenland Ice Sheet into the subpolar ocean, and warm Atlantic Ocean water into Greenland’s fjords, where it can interact with outlet glaciers. Observational evidence from moorings shows that the circulation in this region displays substantial subinertial variability (typically with periods of several days). For the dense water flowing over the Denmark Strait sill, this variability augments the time-mean transport. It has been suggested that the subinertial variability found in observations is associated with coastal trapped waves, whose properties depend on bathymetry, stratification, and the mean flow. Here, we use the output of a high-resolution realistic simulation to diagnose and characterize subinertial variability in sea surface height and velocity along the coast. The results show that the subinertial signals are coherent over hundreds of kilometers along the shelf. We find coastal trapped waves on the shelf and along the shelf break in two subinertial frequency bands—at periods of 1–3 and 5–18 days—that are consistent with a combination of mode-I waves and higher modes. Furthermore, we find that northeasterly barrier winds may trigger the 5–18-day shelf waves, whereas the 1–3-day variability is linked to high wind speeds over Sermilik Deep.
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OceanSpy：一个促进海洋模型数据分析和可视化的Python包
影响因子：
--
作者：
Mattia Almansi, Renske Gelderloos
通讯作者：
Mattia Almansi, Renske Gelderloos
DOI：
--
发表时间：
1980
期刊：
影响因子：
--
作者：
L. Mysak
通讯作者：
L. Mysak
影响因子：
3.5
作者：
M. Spall;J. Pedlosky
通讯作者：
M. Spall;J. Pedlosky
影响因子：
8
作者：
Bromwich, D. H.;Wilson, A. B.;Walsh, J. E.
通讯作者：
Walsh, J. E.
影响因子：
3.5
作者：
Jackson, Rebecca H.;Lentz, Steven J.;Straneo, Fiamma
通讯作者：
Straneo, Fiamma