DOI: 10.1002/2016GL069405
论文题名: Scale-dependent distribution of kinetic energy from surface drifters in the Gulf of Mexico
作者: Balwada D. ; LaCasce J.H. ; Speer K.G.
刊名: Geophysical Research Letters
ISSN: 0094-8493
EISSN: 1944-8224
出版年: 2016
卷: 43, 期: 20 起始页码: 10856
结束页码: 10863
语种: 英语
英文关键词: energy spectrum
; Helmholtz decomposition
; Lagrangian observations
; structure functions
; submesoscale
Scopus关键词: Deformation
; Kinetics
; Lagrange multipliers
; Energy spectra
; Helmholtz decomposition
; Lagrangian observations
; Structure functions
; Submesoscale
; Kinetic energy
英文摘要: The scale-dependent distribution of kinetic energy is probed at the surface in the Gulf of Mexico using surface drifters from the Grand Lagrangian Deployment (GLAD) experiment. The second-order velocity structure function and its decomposition into rotational and divergent components are examined. The results reveal that the divergent component, compared to the rotational component, dominates at scales below 5 km, and the pattern is reversed at larger scales. The divergent component has a slope near 2/3 below 5 km, similar to an energy cascade range (k−5/3). The third-order velocity structure function at scales below 5 km is negative and implies a forward cascade of energy to smaller scales. The rotational component has a steeper slope, roughly 1.5, from scales of 5 km up to the deformation radius. This is similar to a 2-D enstrophy cascade, although the slope is shallower than the predicted 2. There is a brief 2/3 range from the deformation radius to 200 km, suggestive of a 2-D inverse cascade. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84991585172&doi=10.1002%2f2016GL069405&partnerID=40&md5=28817a3912bcb396ed5722cbedacc32e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9456
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: Geophysical Fluid Dynamics Institute, Florida State University, Tallahassee, FL, United States
Recommended Citation:
Balwada D.,LaCasce J.H.,Speer K.G.. Scale-dependent distribution of kinetic energy from surface drifters in the Gulf of Mexico[J]. Geophysical Research Letters,2016-01-01,43(20).