scholarly journals Role of wind, mesoscale dynamics and coastal circulation in the interannual variability of South Vietnam Upwelling, South China Sea. Answers from a high resolution ocean model

2022 ◽  
Author(s):  
Thai To Duy ◽  
Marine Herrmann ◽  
Claude Estournel ◽  
Patrick Marsaleix ◽  
Thomas Duhaut ◽  
...  
Keyword(s):  
South China Sea ◽  
Interannual Variability ◽  
South China ◽  
Coastal Region ◽  
Mekong Delta ◽  
The South ◽  
Offshore Area ◽  
China Sea ◽  
South Vietnam

Abstract. The South Vietnam Upwelling (SVU) develops in the South China Sea off the Vietnamese coast under the influence of southwest monsoon winds. A very high resolution configuration (1 km at the coast) of the SYMPHONIE model was developed over the western coastal region of the South China Sea. A simulation was performed over the period 2009–2018 to study the functioning, variability and influence of oceanic circulation and hydrology in the coastal region, in particular of the SVU. The realism of the simulation in terms of representation of ocean dynamics and water masses, from daily to interannual and coastal to regional scales, is assessed here in detail by comparison with available satellite data and 4 sets of in-situ observations. The interannual variability of the SVU is examined for its 4 main development areas: the southern (SCU) and northern (NCU) coasts, the offshore area (OFU), and the Sunda Shelf area off the Mekong Delta (MKU). For the SCU and OFU, our results confirm the driving role of the summer mean wind and the summer circulation over the offshore area in the interannual variability of the upwelling intensity. They moreover reveal the impact of the spatial and temporal organization of mesoscale ocean structures and high frequency atmospheric forcing. For the NCU, the upwelling interannual variability does not seem to be related to regional scale forcing and dynamics, but is mainly determined by coastal mesoscale structures and circulation: similar summer wind conditions can be associated with very contrasting NCU intensities, and vice versa, depending on the circulation in the NCU area. Finally, our study reveals that upwelling also develops off the Mekong Delta, with an interannual variability mostly determined by the summer wind and the wind-driven circulation over the SVU region.

Daily variability of upwellings ? The case study of South Vietnam upwelling (South China Sea)

2021 ◽  
Author(s):  
Thai Duy To ◽  
Marine Herrmann ◽  
Claude Estournel ◽  
Patrick Marsaleix ◽  
Thomas Duhaut ◽  
...  
Keyword(s):  
South China Sea ◽  
Interannual Variability ◽  
South China ◽  
Intrinsic Variability ◽  
The South ◽  
China Sea ◽  
Leading Role ◽  
South Vietnam ◽  
Daily Scale

<p>The South Vietnam upwelling (SVU) is one of the major processes involved in the South China Sea (SCS) ocean dynamics and planktonic ecosystem. Several numerical modelling studies examined its variability, revealing the leading role of wind and ENSO, but also, more recently, of ocean intrinsic variability (OIV) related to chaotic eddies. However, the spatial resolution of the models used in these studies did not allow to fully consider and understand the role of small scale dynamics. Our objective is therefore to implement a very high resolution model over the SCS in order to investigate the contribution of fine scale dynamics to the daily to interannual variability of the SVU.</p><p>We developed a configuration of the SYMPHONIE regional ocean model, using a curvilinear orthogonal grid over most of the SCS with a horizontal resolution increasing linearly from ~1.0 km along the Vietnamese coast to ~4.5 km offshore, and 50 layers. The surface forcing is prescribed using the 3-hourly output of the ECMWF, tidal forcing by FES2014, the initial and lateral ocean boundary conditions by the daily outputs of the global ocean 1/12° COPERNICUS analysis; monthly climatology and daily of freshwater river runoff are used for the 35 main rivers of the modeled domain.</p><p>We first evaluate the realism of the model by comparing a simulation performed over the period 2008-19 with in-situ measurements and satellite data. This multiannual simulation moreover confirms the leading role of wind on the daily to interannual variability of upwelling that develops in the coastal and offshore region. It also suggests, as already demonstrated by Da et al. (2019) at the interannual scale, that other processes are involved in this development. We thus explore the impact of ocean intrinsic variability, tides and rivers at the daily scale on the upwelling development by studying in details the intense upwelling that develops during summer 2018. For that, we perform several sensitivity experiments including ensemble simulations with perturbated initial conditions. We will present a synthesis of the results that reveal the strong impact of ocean background mesoscale circulation on the upwelling intensity at the daily scale, and its evolution during the summer.</p>

scholarly journals The role of synoptic-scale waves in the onset of the South China Sea summer monsoon

2018 ◽  
Vol 19 (11) ◽  
pp. e858 ◽  
Author(s):  
Jingliang Huangfu ◽  
Wen Chen ◽  
Xu Wang ◽  
Ronghui Huang
Keyword(s):  
South China Sea ◽  
Summer Monsoon ◽  
South China ◽  
The South China Sea ◽  
Synoptic Scale ◽  
The South ◽  
China Sea

scholarly journals Territorial Disputes and Nationalism: A Comparative Case Study of China and Vietnam

2017 ◽  
Vol 36 (1) ◽  
pp. 51-88 ◽  
Author(s):  
Hannah Cotillon
Keyword(s):  
South China Sea ◽  
South China ◽  
Analytical Framework ◽  
The South China Sea ◽  
Comparative Case Study ◽  
Territorial Disputes ◽  
The South ◽  
China Sea ◽  
Maritime Territory

In autocracies, nationalism appears to have merged with geopolitical thinking. In light of this geopoliticisation of nationalism, it is surprising that the literature has paid virtually no attention to the role of territorial disputes as a conditioning factor. The present study seeks to further enhance the field by factoring in the role of territorial disputes in triggering different expressions of nationalism. It develops an analytical framework for typologies of nationalism according to four territorial disputes: China's dispute with Vietnam over maritime territory in the South China Sea, China's dispute with Japan over maritime territory in the East China Sea, Vietnam's dispute with Cambodia over territorial border demarcations, and Vietnam's dispute with China over maritime territory in the South China Sea. The respective disputes of China and Vietnam are analysed and tested against criteria of expressions of nationalism in autocracies. We find that territorial disputes and therefore external context are important conditioning factors of nationalism in autocracies.

Peanut worms of the phylum Sipuncula from the Nha Trang Bay (South China Sea) with a key to species

Zootaxa ◽  
2012 ◽  
Vol 3166 (1) ◽  
pp. 41 ◽  
Author(s):  
ANDREY V. ADRIANOV ◽  
ANASTASSYA S. MAIOROVA
Keyword(s):  
South China Sea ◽  
South China ◽  
Species Level ◽  
The South China Sea ◽  
Key To Species ◽  
The South ◽  
China Sea ◽  
South Vietnam ◽  
Quantitative Characteristics ◽  
Nha Trang Bay

Sipunculan worms from the Vietnamese waters are still poorly investigated, while they are well known from Chinese andTaiwanese waters of the South China Sea. During the years 2008–2010, therefore, we collected sipunculans from NhaTrang Bay in South Vietnam. Twenty species of peanut worms representing eleven genera and five families of the phylumSipuncula are recognized from more than one thousand individuals collected from various biotopes. Fifteen species arenew records for Nha Trang Bay with Nephasoma pellucidum being a new record for the South China Sea. Species accountsinclude the most important taxonomic characters as well as quantitative characteristics, distributions, and specific biotopedata. All species were illustrated in living conditions with everted introvert and tentacular apparatus. Accordingly, a key up to species level is provided.

scholarly journals Role of Coastal Convection to Moisture Buildup during the South China Sea Summer Monsoon Onset

2019 ◽  
Vol 97 (6) ◽  
pp. 1155-1171
Author(s):  
Wei-Ting CHEN ◽  
Chien-Ming WU ◽  
Wei-Ming TSAI ◽  
Peng-Jen CHEN ◽  
Po-Yen CHEN
Keyword(s):  
South China Sea ◽  
Summer Monsoon ◽  
South China ◽  
Monsoon Onset ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Summer Monsoon Onset
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