The eddy pair off eastern Vietnam: Interannual variability and impact on thermohaline structure

Chen, Gengxin; Hou, Yijun; Zhang, Qilong; Chu, Xiaoqing

doi:10.1016/j.csr.2009.11.013

Cited by 70 publications

(56 citation statements)

References 17 publications

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“…Eddy pairs occur east of Vietnam at this season as well (Chen et al 2010). Due to upwelling and offshore transport by a jet, enhanced concentrations of CHL were frequently observed east of Vietnam (Zhao and Tang 2007;Chen et al 2014).…”

Section: A Coupled 3-d Physical and Biogeochemical Modelmentioning

confidence: 96%

“…West of the Luzon Strait, due to fluctuations of the Kuroshio pathway and strong monsoon, mesoscale eddy kinetic energy is strong especially during the northeast monsoon (Chen et al 2011;Nan et al 2011). East of Vietnam, the dipole structure of the wind stress combined with complex topography produces high mesoscale eddy activities (Hwang and Chen 2000;Chen et al 2010).…”

Section: Introductionmentioning

confidence: 99%

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Impacts of mesoscale eddies in the South China Sea on biogeochemical cycles

et al. 2015

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Biogeochemical cycles associated with mesoscale eddies in the South China Sea (SCS) were investigated. The study was based on a coupled physical-biogeochemical Pacific Ocean model (Regional Ocean Model SystemCarbon, Silicate, and Nitrogen Ecosystem, ROMS-CoSiNE) simulation for the period from 1991 to 2008. A total of 568 mesoscale eddies with lifetime longer than 30 days were used in the analysis. Composite analysis revealed that the cyclonic eddies were associated with abundance of nutrients, phytoplankton, and zooplankton while the anticyclonic eddies depressed biogeochemical cycles, which are generally controlled by the eddy pumping mechanism. In addition, diatoms were dominant in phytoplankton species due to the abundance of silicate. Dipole structures of vertical fluxes with net upward motion in cyclonic eddies and net downward motion in anticyclonic eddies were revealed. During the lifetime of an eddy, the evolutions of physical, biological, and chemical structures were not linearly coupled at the eddy core where plankton grew, and composition of the community depended not only on the physical and chemical processes but also on the adjustments by the predator-prey relationship.

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Section: A Coupled 3-d Physical and Biogeochemical Modelmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Impacts of mesoscale eddies in the South China Sea on biogeochemical cycles

et al. 2015

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“…This deformation and movement of coastal water induce mesoscale eddy activities (Gan et al, 2006;Wang et al, 2008;Chen et al, 2010). An eddy pair in the western SCS during the upwelling season is generated probably due to the vorticity transports from the nonlinear effect of the western boundary currents (Xie et al, 2003;Ning et al, 2004;Wang et al, 2006;Chen et al, 2010). Moreover, a pair of anticyclonic eddies (A-A eddy pairs) in the western SCS during the upwelling season was mentioned by Kuo et al (2000) and Xie et al (2003).…”

Section: Introductionmentioning

confidence: 99%

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

2015

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Abstract. High-resolution ocean color observations offer an opportunity to investigate the oceanic small-scale processes. In this study, the Medium Resolution Imaging Spectrometer (MERIS) daily 300 m data were used to study small-scale processes in the western South China Sea. It is indicated that the cyclonic eddies with horizontal scales of 10 km are frequently observed during the upwelling season of each year over the 2004-2009 period. These small-scale eddies were generated in the vicinity of the southern front of the cold tongue, and then propagated eastward with a speed of approximately 12 cm s −1 . This propagation speed was consistent with the velocity of the western boundary current. As a result, the small-scale eddies kept the high levels of phytoplankton rotating 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 anticyclonic 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 became a 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 the cold tongue may also contribute to the formation of the small-scale eddies.

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“…ILD and MLD in CTRL show large biases against those in TRUE, especially in the deep-water region. Previous study shows that the meso-scale eddies can significantly affect the vertical profiles of temperature and salinity (Chen et al 2010). The distributions of meso-scale eddy in TRUE and CTRL obviously differ from each other (Fig.…”

Section: Isothermal Layer Depth (Ild) and Mixed Layer Depth (Mld)mentioning

confidence: 90%

A three-dimensional variational data assimilation system for the South China Sea: preliminary results from observing system simulation experiments

Peng

Zeng

2016

Ocean Dynamics

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A three-dimensional variational data assimilation (3DVAR) system based on the Regional Ocean Modeling System (ROMS) is established for the South China Sea (SCS). A set of Observing System Simulation Experiments (OSSEs) are performed to evaluate the performance of this data assimilation system and investigate the impacts of different types of observations on representation of threedimensional large-scale circulations and meso-scale eddies in the SCS. The pseudo-observations that are examined include sea surface temperatures (SSTs), sea surface heights (SSHs), sparse temperature/salinity (T/S) profiles, sea surface velocities (SSVs), and sea surface salinities (SSSs). The results show that SSHs can extend their impacts into the subsurface or even the deep ocean while other surface observations only have impacts within surface mixed layer. SSVs have similar impacts though confined to their spatial coverage, suggesting that SSVs could be a substitute of SSHs nearshore where SSHs are of poor quality. Despite their sparseness, the T/S profiles improve the representation of the temperature and salinity structures below the mixed layer, and a combination of T/S profiles with surface observations leads to a better representation of the meso-scale eddies. Based on the OSSE results, an affordable observing network for the SCS in the near future is proposed.

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The eddy pair off eastern Vietnam: Interannual variability and impact on thermohaline structure

Cited by 70 publications

References 17 publications

Impacts of mesoscale eddies in the South China Sea on biogeochemical cycles

Impacts of mesoscale eddies in the South China Sea on biogeochemical cycles

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

A three-dimensional variational data assimilation system for the South China Sea: preliminary results from observing system simulation experiments

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