气候变化领域集成服务门户(CCPortal): Observations of the Low-Mode Internal Tide and Its Interaction With Mesoscale Flow South of the Azores

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DOI	10.1029/2019JC015879
	Observations of the Low-Mode Internal Tide and Its Interaction With Mesoscale Flow South of the Azores
	Löb J.; Köhler J.; Mertens C.; Walter M.; Li Z.; von Storch J.-S.; Zhao Z.; Rhein M.
发表日期	2020
ISSN	21699275
卷号	125 期号:11
英文摘要	Understanding the temporal variability of internal tides plays a crucial role in identifying sources and sinks of energy in the ocean. Using a 10-month-long time series from moored instruments inside a tidal beam south of the Azores, the magnitude and the underlying causes of temporal variability in the first two modes of the internal tide energy flux was studied. We analyzed changes of the direction and coherence of the energy flux, its modal structure, and the impact of two eddies. Semidiurnal energy fluxes were further compared with estimates from a 1/10° ocean global circulation model, as well as with fluxes derived from satellite altimetry. All energy fluxes correlate reasonably well in direction, deviations from its fixed phase relation to astronomical forcing, and modal composition while model and satellite underestimate the total energy flux. A pronounced damping of the in situ fluxes coincides with the passing of two eddies. In the presence of a surface-intensified eddy, the coherent part of the energy flux in the first two modes is lowered by more than 40%, a subsurface eddy coincides with a decrease of the energy flux mainly in the second mode. These observations support the hypothesis that eddy interactions increase the incoherent part of the energy flux and transfer energy from low modes into higher modes, which can lead to increased local dissipation. It remains an open question how much of the energy converted from lower to higher modes results in local dissipation, a crucial part in creating energetically consistent ocean-climate models. © 2020. The Authors.
英文关键词	eddy; energy flux; internal waves; mooring; OGCM
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186580
作者单位	MARUM – Center for Marine Environmental Science, University of Bremen, Bremen, Germany; Institute of Environmental Physics, University of Bremen, Bremen, Germany; Max Planck Institute for Meteorology, Hamburg, Germany; Center for Earth System Research and Sustainability (CEN), University of Hamburg, Hamburg, Germany; Applied Physics Laboratory, University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Löb J.,Köhler J.,Mertens C.,et al. Observations of the Low-Mode Internal Tide and Its Interaction With Mesoscale Flow South of the Azores[J],2020,125(11).
APA	Löb J..,Köhler J..,Mertens C..,Walter M..,Li Z..,...&Rhein M..(2020).Observations of the Low-Mode Internal Tide and Its Interaction With Mesoscale Flow South of the Azores.Journal of Geophysical Research: Oceans,125(11).
MLA	Löb J.,et al."Observations of the Low-Mode Internal Tide and Its Interaction With Mesoscale Flow South of the Azores".Journal of Geophysical Research: Oceans 125.11(2020).