期刊
JOURNAL OF PHYSICAL OCEANOGRAPHY
卷 50, 期 5, 页码 1289-1317出版社
AMER METEOROLOGICAL SOC
DOI: 10.1175/JPO-D-19-0202.1
关键词
Eddies; Instability; Ocean circulation; Ocean dynamics; Energy budget; balance
类别
资金
- National Science Foundation of China (NSFC) [41806023, 41975064]
- 2015 Jiangsu Program of Entrepreneurship and Innovation Group
- NUIST Startup Program [2017r054]
- Natural Science Foundation of the Higher Education Institutions of Jiangsu Province [18KJB170019]
- CSC-SOA Joint Scholarship Program [201804180031]
- National Academies of Sciences, Engineering and Medicine (NASEM) UGOS-1 [2000009918]
- Gulf of Mexico Research Initiative (GoMRI) [G-231804]
- NOAA IOOSSECOORAProgram [NA16NOS0120028]
A recently developed tool, the multiscale window transform, along with the theory of canonical energy transfer is used to investigate the roles of multiscale interactions and instabilities in the Gulf of Mexico Loop Current (LC) eddy shedding. A three-scale energetics framework is employed, in which the LC system is reconstructed onto a background flow window, a mesoscale eddy window, and a high-frequency eddy window. The canonical energy transfer between the background flow and the mesoscale windows plays an important role in LC eddy shedding. Barotropic instability contributes to the generation/intensification of the mesoscale eddies over the eastern continental slope of the Campeche Bank. Baroclinic instability favors the growth of the mesoscale eddies that propagate downstream to the northeastern portion of the well-extended LC, eventually causing the shedding by cutting through the neck of the LC. These upper-layer mesoscale eddies lose their kinetic energy back to the background LC through inverse cascade processes in the neck region. The deep eddies obtain energy primarily from the upper layer through vertical pressure work and secondarily from baroclinic instability in the deep layer. In contrast, the canonical energy transfer between the mesoscale and the high-frequency frontal eddy windows accounts for only a small fraction in the mesoscale eddy energy balance, and this generally acts as a damping mechanism for the mesoscale eddies. A budget analysis reveals that the mesoscale eddy energy gained through the instabilities is balanced by horizontal advection, pressure work, and dissipation.
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