scholarly journals Adaptive observation in the South China Sea using CNOP approach based on a 3-D ocean circulation model and its adjoint model

2014 ◽  
Vol 119 (12) ◽  
pp. 8973-8986 ◽  
Author(s):  
Yineng Li ◽  
Shiqiu Peng ◽  
Duanling Liu
Keyword(s):  
South China Sea ◽  
Ocean Circulation ◽  
South China ◽  
Circulation Model ◽  
The South China Sea ◽  
Adjoint Model ◽  
The South ◽  
Ocean Circulation Model ◽  
China Sea ◽  
Adaptive Observation

scholarly journals A Three-Layer Alternating Spinning Circulation in the South China Sea

2016 ◽  
Vol 46 (8) ◽  
pp. 2309-2315 ◽  
Author(s):  
Jianping Gan ◽  
Zhiqiang Liu ◽  
Chiwing Rex Hui
Keyword(s):  
South China Sea ◽  
Ocean Circulation ◽  
South China ◽  
Three Dimensional ◽  
Circulation Model ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Vorticity Flux ◽  
Intrinsic Dynamic

AbstractUnderstanding of the three-dimensional circulation in the South China Sea (SCS) is crucial for determining the transports of water masses, energy, and biogeochemical substances in the regional and adjacent larger oceans. The circulation’s kinematic and dynamic natures, however, are largely unclear. Results from a three-dimensional numerical ocean circulation model and geostrophic currents, derived from hydrographic data, reveal the existence of a unique, three-layer, cyclonic–anticyclonic–cyclonic (CAC) circulation in the upper (<750 m), middle (750–1500 m), and deep (>1500 m) layers in the SCS with differing seasonality. An inflow–outflow–inflow structure in Luzon Strait largely induces the CAC circulation, which leads to vortex stretching in the SCS basin because of a lateral planetary vorticity flux in each of the respective layers. The formation of joint effects of baroclinicity and relief (JEBAR) is an intrinsic dynamic response to the CAC circulation. The JEBAR arises from the CAC flow–topography interaction in the SCS.

Water, heat and salt budgets over South East Asia seas : a high resolution modeling approach

2021 ◽  
Author(s):  
Marine Herrmann ◽  
Ngoc Trinh Bich ◽  
Caroline Ulses ◽  
Patrick Marsaleix ◽  
Thomas Duhaut ◽  
...  
Keyword(s):  
High Resolution ◽  
South China Sea ◽  
East Asia ◽  
Ocean Circulation ◽  
South China ◽  
The South China Sea ◽  
South East Asia ◽  
The South ◽  
China Sea ◽  
Numerical Studies

&lt;p&gt;South East Asia seas, that include the South China Sea and the Indonesian Seas, transfer the warm and light waters of the surface branch of the global thermohaline circulation between the Pacific and Indian Oceans. To better understand the key contribution of South East Asia seas in the regional and global climate and ocean circulation, it is therefore essential to improve our knowledge of the functioning and variability at different scales of water, heat and salt budgets over this region. The complex topography of this region makes it difficult to study those budgets based on in-situ measurements only. Numerical studies are necessary and relevant to complement and interpret those measurements, however until now, most of numerical studies were performed at low resolution and/or on short periods.&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;To better quantify and understand the contributions of ocean, rivers and atmosphere to the variability at different scales of the water, heat and salt budgets over South East Asia seas, high resolution configurations (&lt; 5 km) of the SYMPHONIE ocean model are developed over the area. State of the art datasets available from COPERNICUS and ECMWF are used to prescribe boundary conditions. Each term of the budgets is computed online in order to obtain rigorously closed budgets.&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;This methodology applied on the 2009-2018 period, that includes strong El Ni&amp;#241;o and La Ni&amp;#241;a years as well as neutral years, allows us to better characterize the seasonal to interannual variability of water, salt and heat budgets over the South East Asia seas, by quantifying and explaining the contribution of each factor (lateral fluxes, surface fluxes, rivers, internal variations, ENSO). We examine in particular the surface salinification of the South China Sea that was observed by previous authors between 2012 and 2016 (Zeng et al. 2018, doi:10.1002/2017GL076574) : our simulations suggest that it is mostly related to an increase of net lateral water influx at Luzon strait, itself induced by a deficit of precipitation over the region, rather than to an increase of the salinity of the inflowing water. We finally also explore the role of tides and mesoscale processes. This methodology, our key results and the future steps of this work, that include the on-going development of an ocean-atmosphere regional coupled model, will be synthetically summarized.&lt;/p&gt;

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