scholarly journals Winter Eddy Genesis in the Eastern South China Sea due to Orographic Wind Jets

2008 ◽  
Vol 38 (3) ◽  
pp. 726-732 ◽  
Author(s):  
Guihua Wang ◽  
Dake Chen ◽  
Jilan Su
Keyword(s):  
South China Sea ◽  
South China ◽  
Mesoscale Eddies ◽  
Winter Monsoon ◽  
Wind Forcing ◽  
Local Wind ◽  
Orographic Effects ◽  
China Sea ◽  
The Rich ◽  
Anticyclonic Eddies

Abstract Generation of mesoscale eddies in the eastern South China Sea (SCS) in winters during August 1999 to July 2002 is studied with a reduced-gravity model. It is found that the orographic wind jets associated with the northeast winter monsoon and the gaps in the mountainous island chain along the eastern boundary of the SCS can spin up cyclonic and anticyclonic eddies over the SCS. Results suggest that direct wind forcing could be an important generation mechanism for the rich eddy activity in the SCS, and that to simulate this mechanism the resolution of the wind forcing has to be high enough to resolve the local wind jets induced by orographic effects.

scholarly journals Could the two anticyclonic eddies during winter 2003/2004 be reproduced and predicted in the northern South China Sea?

Ocean Science ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 97-111 ◽  
Author(s):  
Dazhi Xu ◽  
Wei Zhuang ◽  
Youfang Yan
Keyword(s):  
South China Sea ◽  
South China ◽  
Large Scale ◽  
Numerical Models ◽  
Northern South China Sea ◽  
Mesoscale Eddies ◽  
Nonlinearity Parameter ◽  
Observation Data ◽  
China Sea ◽  
Anticyclonic Eddies

Abstract. Great progress has been made in understanding the mesoscale eddies and their role on the large-scale structure and circulation of the oceans. However, many questions still remain to be resolved, especially with regard to the reproductivity and predictability of mesoscale eddies. In this study, the reproductivity and predictability of mesoscale eddies in the northern South China Sea (NSCS), a region with strong eddy activity, are investigated with a focus on two typical anticyclonic eddies (AE1 and AE2) based on a HYCOM–EnOI assimilated system. The comparisons of assimilated results and observations suggest that generation, evolution, and propagation paths of AE1 and AE2 can be well reproduced and forecasted when the observed amplitude is >8 cm (or the advective nonlinearity parameter U∕c is >2), although their forcing mechanisms are quite different. However, when their amplitudes are less than 8 cm, the generation and decay of these two mesoscale eddies cannot be well reproduced and predicted by the system. This result suggests, in addition to dynamical mechanisms, that the spatial resolution of assimilation observation data and numerical models must be taken into account in reproducing and predicting mesoscale eddies in the NSCS.

scholarly journals Impact of mesoscale eddies on the source funnel of sediment trap measurements in the South China Sea

2021 ◽  
pp. 102566
Author(s):  
Wentao Ma ◽  
Peng Xiu ◽  
Fei Chai ◽  
Lihua Ran ◽  
Martin G. Wiesner ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Sediment Trap ◽  
Mesoscale Eddies ◽  
The South China Sea ◽  
The South ◽  
China Sea

scholarly journals Satellite observations of the small-scale cyclonic eddies in the western South China Sea

2014 ◽  
Vol 11 (9) ◽  
pp. 13515-13532
Author(s):  
F. Liu ◽  
S. Tang ◽  
C. Chen
Keyword(s):  
South China Sea ◽  
South China ◽  
Rotation Speed ◽  
Mesoscale Eddies ◽  
Small Scale ◽  
Western Boundary ◽  
Cold Tongue ◽  
China Sea ◽  
Western South China Sea ◽  
Offshore Transport

Abstract. High-resolution ocean color observation offers an opportunity to investigate the oceanic small-scale processes. In this study, The Medium Resolution Imaging Spectrometer (MERIS) daily 300 m data are used to study small-scale processes in the western South China Sea. It is indicated that the cyclonic eddies with horizontal scales of the order of 10 km are frequently observed during upwelling season of each year over 2004–2009. These small-scale eddies are generated in the vicinity of the southern front of the cold tongue, and then propagate eastward with a speed of approximately 12 cm s−1. This propagation speed is consistent with the velocity of the western boundary current. As a result, the small-scale eddies keep rotating high levels of the phytoplankton away from the coastal areas, resulting in the accumulation of phytoplankton in the interior of the eddies. The generation of the small-scale eddies may be associated with strengthening of the relative movement between the rotation speed of the anticylconic mesoscale eddies and the offshore transport. With the increases of the normalized rotation speed of the anticyclonic mesoscale eddies relative to the offshore transport, the offshore current become meander under the impacts of the anticyclonic mesoscale eddies. The meandered cold tongue and instability front may stimulate the generation of the small-scale eddies. Unidirectional uniform wind along cold tongue may also contribute to the formation of the small-scale eddies.

Mesoscale eddies cases study at Xisha waters in the South China Sea in 2009/2010

2015 ◽  
Vol 120 (1) ◽  
pp. 517-532 ◽  
Author(s):  
Qiang Wang ◽  
Lili Zeng ◽  
Weidong Zhou ◽  
Qiang Xie ◽  
Shuqun Cai ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Mesoscale Eddies ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Cases Study
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