.png){kind=icon}
返回
Rotating Horizontal Convection
.png){kind=icon}
OA
AI
DOI：10.1146/annurev-fluid-030121-115729.png)
.png){kind=icon}
原文求助.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
Global differences of temperature and buoyancy flux at the ocean surface are responsible for small-scale convection at high latitudes, global overturning, and the top-to-bottom density difference in the oceans. With planetary rotation the convection also contributes to the large-scale horizontal, geostrophic circulation, and it crucially involves a 3D linkage between the geostrophic circulation and vertical overturning. The governing dynamics of such a surface-forced convective flow are fundamentally different from Rayleigh-Benard convection, and the role of buoyancy forcing in the oceans is poorly understood. Geostrophic balance adds to the constraints on transport in horizontal convection, as illustrated by experiments, theoretical scaling, and turbulence-resolving simulations for closed (mid-latitude) basins and an annulus or reentrant zonal (circumpolar) channel. In these geometries, buoyancy drives either horizontal mid-latitude gyre recirculations or a strong Antarctic Circumpolar Current, respectively, in addition to overturning. At large Rayleigh numbers the release of available potential energy by convection leads to turbulent mixing with a mixing efficiency approaching unity. Turbulence-resolving models are also revealing the relative roles of wind stress and buoyancy when there is mixed forcing, and in future work they need to include the effects of turbulent mixing due to energy input from tides.
Keyword:
ocean convection
surface buoyancy fluxes
geostrophic circulation
overturning circulation
turbulent mixing
期刊
IF:
30.2
论文数:
611
被引数:
1.9W
机构
引用论文
A simple convective model of the global overturning circulation, including effects of entrainment into sinking regions.png)
OCEAN MODELLING
OCEAN MODELLINGIF2.9
PREAI
分享收藏
查看更多内容