Inter-annual variability of upwelling off the South-Vietnamese coast and its relation to nutrient dynamics

Hein, Hartmut; Hein, Birte; Pohlmann, Thomas; Long, Bui Hong

doi:10.1016/j.gloplacha.2013.09.009

Cited by 30 publications

(33 citation statements)

References 47 publications

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“…9a-d, with sea surface height overlaid. Consistent with previous studies, the coastal current flows northward along the shelf (Hein et al, 2013). The current also dissipates freshwater from the Mekong River, while the water seldom spreads away from the coast.…”

Section: Analysis Of Model Results 230supporting

confidence: 90%

“…The influence of the circulation is further elucidated below. Table 1 summarizes the difference of the ecosystems in the In the VBUS, the availability of nutrients principally controls the productivity (Hein et al, 2013). Considering a quasi-steady state of nutrient in a coastal region, river-injected and upward inputted nutrient should be counterbalanced by vertical export production and lateral exchanges.…”

Section: Dynamic Analysismentioning

confidence: 99%

“…The VBUS upwelling strength is intense, and can result in surface cooling of 3~5 °C and an associated cold filament length of ~500 km . The VBUS is modulated by different climatic variations, such as the El Niño and Southern Oscillation (Dippner et al, 2006;Hein et al, 2013;Xie et al, 2003), the Indian Ocean Dipole (Liu et al, 2012;Xie et al, 2009), and the Madden-Julian Oscillation (Isoguchi and Kawamura, 2006;Liu et al, 45 2012).…”

Section: Introduction 25mentioning

confidence: 99%

“…During post-El Niño summer, the weakened southwesterly wind weakens the upwelling and reduces the upward nutrient flux (Xie et al, 2003). In addition, Hein et al (2013) proposed instead that productivity is controlled by lateral transport of nitrate in the VBUS. Liu et al (2002) also 50 highlighted the role of coastal jet located to south of Vietnam coast.…”

Section: Introduction 25mentioning

confidence: 99%

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Physical Modulation to the Biological Productivity in the Summer Vietnam Upwelling System

Lu¹,

Liao²,

Yan³

et al. 2018

Preprint

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Abstract. Biological productivity in the summer Vietnam boundary upwelling system in the western SouthChina Sea, as in many coastal upwelling systems, is strongly modulated by wind. However, the role of ocean 15 circulation and mesoscale eddies has not been elucidated. Here we show a close spatio-temporal covariability between primary production and kinetic energy. High productivity is associated with high kinetic energy, which accounts for ~15% of the production variability. Results from a physical-biological coupled model reveal that the elevated kinetic energy and intensified circulation can be explained by the separation of the upwelling current system. The separated current forms an eastward jet into the interior South China Sea, 20 and the associated southern gyre traps nutrient and favors productivity. When separation is absent, the model shows weakened circulation and eddy activity, with ~21% less nitrate inventory and ~16% weaker primary productivity.

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Section: Analysis Of Model Results 230supporting

confidence: 90%

Section: Dynamic Analysismentioning

confidence: 99%

Section: Introduction 25mentioning

confidence: 99%

Section: Introduction 25mentioning

confidence: 99%

See 2 more Smart Citations

Physical Modulation to the Biological Productivity in the Summer Vietnam Upwelling System

Lu¹,

Liao²,

Yan³

et al. 2018

Preprint

View full text Add to dashboard Cite

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“…However, a recent research also proposed that the summer SST in the SCS is correlated with ENSO in the preceding winter [ Yang et al ., ]. The coastal upwelling in the western SCS is strong with the center moving southward in an El Niño year (such as 1997 and 2003) but weak in a La Niña year (such as 1998) [e.g., Kuo et al ., ; Hein et al ., ]. The Luzon cold eddy has significant interannual variation and is highly correlated to the ENSO events, as demonstrated by an extra‐strong basin‐wide warming in the summer of 1998 that persisted until autumn and winter and prevented the formation of winter upwelling off Luzon in that year [ Wu and Chang , ].…”

Section: Progress Of Upwelling Studies In the China Seasmentioning

confidence: 99%

Progress on upwelling studies in the China seas

Wang

2016

Reviews of Geophysics

225

130

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East Asian marginal seas surrounding China exhibit rich ocean upwelling, mostly in response to the southwesterly summer monsoon. Upwelling in the China seas, namely, the South China Sea, the Taiwan Strait, the East China Sea, the Yellow Sea, and the Bohai Sea, has become increasingly important because the potential changes in the upwelling may have dramatic ecosystem, socioeconomic, and climate impacts. This paper reviews the progress of upwelling studies in the China seas since the year 2000, by presenting the principal characteristics and new understanding of 12 major upwelling regions in the China seas. Upwelling exhibits long-term variability at intraseasonal to multidecadal scales as well as short-term variability frequently caused by tropical cyclones. It is also associated with the El Niño-Southern Oscillation, local environmental variation, and biogeochemical factors. The coastal upwelling around Hainan Island and the upwelling or cold dome northeast of Taiwan Island are specifically highlighted because they have attracted great interest for decades. This paper summarizes upwelling mechanisms in terms of wind, topography, tide, stratification, and background flow, with applications mostly to the China seas. Finally, we propose some topics for future upwelling research, i.e., potential intensification of coastal upwelling under global climate change, downwelling, intrusion of upwelling into coastal embayments, and the influence of upwelling on fishery and biogeochemical processes.

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Abrupt change in Vietnam coastal upwelling as a response to global warming

Kong

et al. 2021

J Quaternary Science

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Coastal upwelling is of great social and economic significance to the human community. The Vietnam coastal upwelling is a fundamental part of upwelling systems in the South China Sea, western Pacific Ocean. However, its sedimentary response to global warming has been largely unknown. Here we reconstruct a 3200‐year sedimentary record based on high‐resolution geochemical analyses of a marine core from off the Vietnamese coast. The results reveal an abrupt sedimentary change since approximately 1950 ce. The abrupt change is explained by concurrent rapid intensification of the coastal upwelling. This can be ascribed to significant global change since the beginning of the 20th century. Global warming could enhance wind speed during the summer and strengthen the coastal upwelling. The forced upwelling results in an increase in nutrient availability and marine primary production; however, ongoing global warming may also increase the risk of more frequent algal blooms in this area.

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Inter-annual variability of upwelling off the South-Vietnamese coast and its relation to nutrient dynamics

Cited by 30 publications

References 47 publications

Physical Modulation to the Biological Productivity in the Summer Vietnam Upwelling System

Physical Modulation to the Biological Productivity in the Summer Vietnam Upwelling System

Progress on upwelling studies in the China seas

Abrupt change in Vietnam coastal upwelling as a response to global warming

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