scholarly journals On the near-inertial variations of meridional overturning circulation in the South China Sea

Ocean Science ◽  
2016 ◽  
Vol 12 (1) ◽  
pp. 335-344 ◽  
Author(s):  
Jingen Xiao ◽  
Qiang Xie ◽  
Dongxiao Wang ◽  
Lei Yang ◽  
Yeqiang Shu ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Maximum Amplitude ◽  
Luzon Strait ◽  
The South China Sea ◽  
Meridional Overturning Circulation ◽  
The South ◽  
Overturning Circulation ◽  
China Sea ◽  
Meridional Overturning

Abstract. We examine near-inertial variability of the meridional overturning circulation in the South China Sea (SCSMOC) using a global 1 / 12° ocean reanalysis. Based on wavelet analysis and power spectrum, we suggest that deep SCSMOC has a significant near-inertial band. The maximum amplitude of the near-inertial signal in the SCSMOC is nearly 4 Sv. The spatial structure of the signal features regularly alternating counterclockwise and clockwise overturning cells. It is also found that the near-inertial signal of SCSMOC mainly originates from the region near the Luzon Strait and propagates equatorward at a speed of 1–3 m s−1. Further analyses suggest that the near-inertial signal in the SCSMOC is triggered by high-frequency wind variability near the Luzon Strait, where geostrophic shear always exists due to Kuroshio intrusion.

scholarly journals The near-inertial variability of meridional overturning circulation in the South China Sea as shown by an eddy-resolving ocean reanalysis

2015 ◽  
Vol 12 (5) ◽  
pp. 2123-2146
Author(s):  
J. Xiao ◽  
D. Wang ◽  
Q. Xie ◽  
Y. Shu ◽  
C. Liu ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Luzon Strait ◽  
The South China Sea ◽  
Meridional Overturning Circulation ◽  
The South ◽  
Overturning Circulation ◽  
Ocean Reanalysis ◽  
China Sea ◽  
Meridional Overturning

Abstract. The near-inertial variability of the meridional overturning circulation in the South China Sea (SCSMOC) has been analyzed based on a global 1/12° ocean reanalysis. The wavelet analysis and power spectrum of deep SCSMOC time series shows that there is a significant signal in the near-inertial band. The maximum amplitude of the near-inertial signal in the SCSMOC is nearly 4 Sv. The spatial structure of the signal features regularly alternating counterclockwise and clockwise overturning cells. It is also found that the near-inertial signal of SCSMOC mainly originates from the Luzon Strait and propagates equatorward with the speed of 1–3 m s−1. Further analyses suggest that the near-inertial signal in the SCSMOC is triggered by high-frequency wind variability near the Luzon Strait where geostrophic shear always exists due to Kuroshio intrusion.

Progress on deep circulation and meridional overturning circulation in the South China Sea

2016 ◽  
Vol 59 (9) ◽  
pp. 1827-1833 ◽  
Author(s):  
DongXiao Wang ◽  
JinGen Xiao ◽  
YeQiang Shu ◽  
Qiang Xie ◽  
Ju Chen ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
The South China Sea ◽  
Meridional Overturning Circulation ◽  
The South ◽  
Overturning Circulation ◽  
China Sea ◽  
Deep Circulation ◽  
Meridional Overturning

scholarly journals Circulation Driven by Multihump Turbulent Mixing Over a Seamount in the South China Sea

2022 ◽  
Vol 8 ◽  
Author(s):  
Ruijie Ye ◽  
Xiaodong Shang ◽  
Wei Zhao ◽  
Chun Zhou ◽  
Qingxuan Yang ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Deep Water ◽  
Turbulent Mixing ◽  
Three Dimensional ◽  
The South China Sea ◽  
Meridional Overturning Circulation ◽  
Overturning Circulation ◽  
China Sea ◽  
Meridional Overturning

Turbulent mixing above rough topography is crucial for the vertical motions of deep water and the closure of the meridional overturning circulation. Related to prominent topographic features, turbulent mixing not only exhibits a bottom-intensified vertical structure but also displays substantial lateral variation. How turbulent mixing varies in the upslope direction and its impact on the upwelling of deep water over sloping topography remains poorly understood. In this study, the notable multihump structure of the bottom-intensified turbulent diffusivity in the upslope direction of a seamount in the South China Sea (SCS) is revealed by full-depth fine-resolution microstructure and hydrographic profiles. Numerical experiments indicate that multihump bottom-intensified turbulent mixing around a seamount could lead to multiple cells of locally strengthened circulations consisting of upwelling (downwelling) motions in (above) the bottom boundary layer (BBL) that are induced by bottom convergence (divergence) of the turbulent buoyancy flux. Accompanied by cyclonic (anticyclonic) flow, a three-dimensional spiral circulation manifests around the seamount topography. These findings regarding the turbulent mixing and three-dimensional circulation around a deep seamount provide support for the further interpretation of the abyssal meridional overturning circulation.

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