DOI: 10.1002/2016GL069782
论文题名: Characterization of the submesoscale energy cascade in the Alboran Sea thermocline from spectral analysis of high-resolution MCS data
作者: Sallares V. ; Mojica J.F. ; Biescas B. ; Klaeschen D. ; Gràcia E.
刊名: Geophysical Research Letters
ISSN: 0094-9563
EISSN: 1944-9294
出版年: 2016
卷: 43, 期: 12 起始页码: 6461
结束页码: 6468
语种: 英语
英文关键词: acoustic methods
; horizontal slope spectra
; internal waves
; multichannel seismics
; shear instability
; turbulence
Scopus关键词: Chains
; Kinetic energy
; Kinetics
; Oceanography
; Reflection
; Spectrum analysis
; Stream flow
; Turbulence
; Acoustic method
; Acoustic reflectors
; Internal waves
; Isotropic turbulence
; Multi-channel seismic
; Multichannel
; Shear instability
; Vertical displacements
; Shear flow
英文摘要: Part of the kinetic energy that maintains ocean circulation cascades down to small scales until it is dissipated through mixing. While most steps of this downward energy cascade are well understood, an observational gap exists at horizontal scales of 103–101 m that prevents characterizing a key step in the chain: the transition from anisotropic internal wave motions to isotropic turbulence. Here we show that this observational gap can be covered using high-resolution multichannel seismic (HR-MCS) data. Spectral analysis of acoustic reflectors imaged in the Alboran Sea thermocline shows that this transition is likely caused by shear instabilities. In particular, we show that the averaged horizontal wave number spectra of the reflectors vertical displacements display three subranges that reproduce theoretical spectral slopes of internal waves (λx > 100 m), Kelvin-Helmholtz-type shear instabilities (100 m > λx > 33 m), and turbulence (λx < 33 m), indicating that the whole chain of events is occurring continuously and simultaneously in the surveyed area. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84977537635&doi=10.1002%2f2016GL069782&partnerID=40&md5=d8c8c575e4127c1a48da11b31799145e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10526
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Barcelona-CSI, Institute of Marine Sciences - CSIC, Barcelona, Spain
Recommended Citation:
Sallares V.,Mojica J.F.,Biescas B.,et al. Characterization of the submesoscale energy cascade in the Alboran Sea thermocline from spectral analysis of high-resolution MCS data[J]. Geophysical Research Letters,2016-01-01,43(12).