Energy and enstrophy cascades in the geostrophic vortex with slowly varying inertia-gravity wave spirals

doi:10.1063/5.0062814

IOCAS-IR > 海洋环流与波动重点实验室

	Energy and enstrophy cascades in the geostrophic vortex with slowly varying inertia-gravity wave spirals
	Liu, Yinghe 1,2,3,4; Xu, Yongsheng1,3,4
	2021-09-01
发表期刊	PHYSICS OF FLUIDS
ISSN	1070-6631
卷号	33 期号:9 页码:15
通讯作者	Xu, Yongsheng([email protected])
摘要	Although geostrophically balanced mesoscale vortices and unbalanced small-scale turbulence have been well studied, the link between them is not entirely clear, especially in the vertical dimension. The inertia-gravity wave (IGW) spiral plays an important role in the energy and enstrophy cascades between the geostrophic vortex and the small-scale turbulence. Since the vertical velocity cannot be measured in practice, the slowly varying IGW spiral formula in a vortex is used to distinguish the direction of vertical velocity. The vertical deformation of the vortex with IGW spirals results in a vertical semi-circulating cycle of the energy cascades: the energy cascades forward from the geostrophic vortex scale to small scales in the IGW spiral at one depth, flows along the IGW spiral, and then inversely cascades to the geostrophic vortex scale at another depth. Some small-scale energy at one depth eventually reaches large scales at another depth, which can prevent some energy from falling into small-scale dissipation, allowing the geostrophic vortex to continue for months in the ocean. A vertical full-circulating cycle is formed by connecting every IGW spiral in different geostrophic vortices and jets, similar to the energy exchange in the capillaries of the human body. The vertical closed zero-flux line of enstrophy cascades caused by the IGW spiral in a geostrophic vortex isolates the enstrophy at different scales to reduce the dissipation. Due to the IGW spiral, the energy and enstrophy spectra in the geostrophic vortex are -1 and 1 at small scales, respectively.
DOI	10.1063/5.0062814
收录类别	SCI
语种	英语
资助项目	Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology (Qingdao)[2018SDKJ0102-7]; Strategic Priority Research Program of Chinese Academy of Sciences[XDB42000000]; National Key Research and Development Program[2016YFC1401004]; National Key Research and Development Program[2019YFC1509102]; National Natural Science Foundation of China[41676168]; National Natural Science Foundation of China[41906027]; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1406401]
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
WOS记录号	WOS:000751302800003
出版者	AIP Publishing
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/177792
专题	海洋环流与波动重点实验室
通讯作者	Xu, Yongsheng
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Ocean & Climate Dynam, Qingdao 266237, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China
第一作者单位	海洋环流与波动重点实验室
通讯作者单位	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Liu, Yinghe,Xu, Yongsheng. Energy and enstrophy cascades in the geostrophic vortex with slowly varying inertia-gravity wave spirals[J]. PHYSICS OF FLUIDS,2021,33(9):15.
APA	Liu, Yinghe,&Xu, Yongsheng.(2021).Energy and enstrophy cascades in the geostrophic vortex with slowly varying inertia-gravity wave spirals.PHYSICS OF FLUIDS,33(9),15.
MLA	Liu, Yinghe,et al."Energy and enstrophy cascades in the geostrophic vortex with slowly varying inertia-gravity wave spirals".PHYSICS OF FLUIDS 33.9(2021):15.