气候变化领域集成服务门户(CCPortal): Source Regions of Infragravity Waves Recorded at the Bottom of the Equatorial Atlantic Ocean, Using OBS of the PI-LAB Experiment

CCPortal

DOI	10.1029/2019JC015430
	Source Regions of Infragravity Waves Recorded at the Bottom of the Equatorial Atlantic Ocean, Using OBS of the PI-LAB Experiment
	Bogiatzis P.; Karamitrou A.; Ward Neale J.; Harmon N.; Rychert C.A.; Srokosz M.
发表日期	2020
ISSN	21699275
卷号	125 期号:6
英文摘要	Infragravity waves are generated along coasts, and some small fraction of their energy escapes to the open oceans and propagates with little attenuation. Due to the scarcity of deep-ocean observations of these waves, the mechanism and the extent of the infragravity waves energy leakage from the coasts remains poorly understood. Understanding the generation and pathways of infragravity wave energy is important among others for understanding the breakup of ice-shelves and the contamination of high-resolution satellite radar altimetry measurements of sea level. We examine data from 37 differential pressure gauges of Ocean Bottom Seismometers (OBS) near the equatorial mid-Atlantic ridge, deployed during the Passive Imaging of the Lithosphere-Asthenosphere Boundary (PI-LAB) experiment. We use the beamforming technique to investigate the incoming directions of infragravity waves. Next, we develop a graph-theory-based global back-projection method of noise cross-correlation function envelopes, which minimizes the effects of array geometry using an adaptive weighting scheme. This approach allows us to locate the sources of the infragravity energy. We assess our observations by comparing to a global model of infragravity wave heights. Our results reveal strong coherent energy from sources and/or reflected phases at the west coast of Africa and some sources from South America. These energy sources are in good agreement with the global infragravity wave model. In addition, we also observe infragravity waves arriving from North America during specific events that mostly occur during October–February 2016. Finally, we find indications of waves that propagate with little attenuation, long distances through sea ice, reflecting off Antarctica. © 2020. The Authors.
英文关键词	Africa; Antarctica; Atlantic Ocean; back-projection; beamforming; infragravity waves
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/186834
作者单位	Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, United Kingdom; Department of Geophysics, Aristotle University of Thessaloniki, Thessaloniki, Greece; Now at Archaeology, University of Southampton, Southampton, United Kingdom; National Oceanography Centre, Southampton, United Kingdom
推荐引用方式 GB/T 7714	Bogiatzis P.,Karamitrou A.,Ward Neale J.,et al. Source Regions of Infragravity Waves Recorded at the Bottom of the Equatorial Atlantic Ocean, Using OBS of the PI-LAB Experiment[J],2020,125(6).
APA	Bogiatzis P.,Karamitrou A.,Ward Neale J.,Harmon N.,Rychert C.A.,&Srokosz M..(2020).Source Regions of Infragravity Waves Recorded at the Bottom of the Equatorial Atlantic Ocean, Using OBS of the PI-LAB Experiment.Journal of Geophysical Research: Oceans,125(6).
MLA	Bogiatzis P.,et al."Source Regions of Infragravity Waves Recorded at the Bottom of the Equatorial Atlantic Ocean, Using OBS of the PI-LAB Experiment".Journal of Geophysical Research: Oceans 125.6(2020).