Winter bloom and associated upwelling northwest of the <scp>L</scp>uzon <scp>I</scp>sland: A coupled physical‐biological modeling approach

Lu, Wenfang; Yan, Xiao‐Hai; Jiang, Yuwu

doi:10.1002/2014jc010218

Cited by 48 publications

(45 citation statements)

References 38 publications

(68 reference statements)

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“…The averaged MLD was 27–28 m for both floats, with the northern float (0347) observing deeper ML in winter and shallower ML in summer, compared to the central basin one (0348). Isotherm z T22 generally followed the dynamics of MLD for both floats, except for an obvious uplift in the first winter (December 2014 to March 2015) which suggested the presence of upwelling near the Luzon Strait as reported previously (Chen et al, ; Lu et al, ). Sea surface winds (SSW) displayed the monsoon's features, with stronger winds in winter and summer (Figures a and a).…”

Section: Resultssupporting

confidence: 83%

Temporal and Vertical Variations of Particulate and Dissolved Optical Properties in the South China Sea

et al. 2019

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Two Bio‐Argo floats measured the concentration of chlorophyll‐a, the backscattering coefficient, the fluorescence of humic‐like dissolved organic matter, dissolved oxygen, and temperature and salinity in the northern and central basins of the South China Sea for over 2 years. Temporal evolutions of bio‐optical properties were analyzed at surface, subsurface, and in the whole water column, respectively. It was found that (1) The seasonal variability of the surface chlorophyll‐a was highly controlled by photoacclimation, especially in the central basin; (2) backscattering in the upper 150 m was nearly constant, exhibiting no distinct seasonality; (3) with vertical mixing, particles from the deep chlorophyll maxima were entrained into the mixed layer resulting in enhanced surface chlorophyll during the early winter. This phenomenon may mislead a study based on satellite data which is likely to interpret it as blooming rather than a redistribution of phytoplankton within the water column; (4) analysis of a winter bloom and an anticyclonic eddy reveal that physical entrainment and biological photoacclimation modulated the vertical distributions of chlorophyll‐a and particles and potentially also changes of phytoplankton community composition; and (5) fluorescent dissolved organic matter was found to be highly coupled to phytoplankton dynamics in both basins, with a maximum (after removing the contribution of physical convective mixing) located at the depth of chlorophyll‐a subsurface maximum.

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Section: Resultssupporting

confidence: 83%

Temporal and Vertical Variations of Particulate and Dissolved Optical Properties in the South China Sea

et al. 2019

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“… Wang et al ., 2010; Zhao et al ., ]. In the Luzon Strait, the winter bloom occurs during the relaxation period of intensified northeasterly winds when the deepened mixed layer starts to shoal, and the advection of relative vorticity primarily contributes to the subsurface upwelling that supplies nutrients to the region below the mixed layer [ Lu et al ., ]. In the Sabah waters of the southeastern SCS, phytoplankton blooms frequently appear from December to the following April as a result of strong northeasterly wind‐induced coastal upwelling [ Abdul‐Hadi et al ., ].…”

Section: Progress Of Upwelling Studies In the China Seasmentioning

confidence: 99%

Progress on upwelling studies in the China seas

Wang

2016

Reviews of Geophysics

212

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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“…These high chlorophyll patches vary in 1-10 km distance in space and on daily basis in time, which is consistent with frontal features (Figure 1). Several mechanisms have been proposed to investigate the LZB dynamics, such as the monsoon-driven coastal upwelling (Qiu et al, 2012;Wang et al, 2010), the winter mixing (Lu et al, 2015), mesoscale eddies (Chen et al, 2007), remote advection from the coast (Liu et al, 2002;Lu et al, 2015), and upwelling caused by currents, such as the Luzon costal current (LCC) (Chen et al, 2006;Hu et al, 2000;Shaw et al, 1996). However, these studies mainly focused on the effects of large and mesoscale processes based on observations and model outputs with resolutions too coarse to resolve patchy phytoplankton dynamics and actually missed the underlying mechanisms for the occurrence of the extremely high chlorophyll.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Chlorophyll Concentrations Induced by Kuroshio Intrusion Fronts in the Northern South China Sea

Guo

Xiu

Chai

et al. 2017

Geophysical Research Letters

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New evidences were provided that Kuroshio intrusion in winter is able to increase phytoplankton growth in the open ocean of the northern South China Sea (SCS) based on multiple data sources. Strong fronts due to Kuroshio intrusion and interactions with the SCS water are associated with intense upwelling, supplying high nutrients from the subsurface SCS water and increasing phytoplankton productivity in the frontal region. High chlorophyll is more dynamically related to these fronts than to the alongshore wind, wind stress curl, and eddy kinetic energy on interannual time scale. Further examinations suggest that fronts associated with Kuroshio intrusion into the SCS are linked with large‐scale climate variability. During El Niño years, stronger Kuroshio intrusion results in stronger fronts that generate intensified local upwelling and enhanced Luzon winter blooms.

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Winter bloom and associated upwelling northwest of the Luzon Island: A coupled physical‐biological modeling approach

Cited by 48 publications

References 38 publications

Temporal and Vertical Variations of Particulate and Dissolved Optical Properties in the South China Sea

Temporal and Vertical Variations of Particulate and Dissolved Optical Properties in the South China Sea

Progress on upwelling studies in the China seas

Enhanced Chlorophyll Concentrations Induced by Kuroshio Intrusion Fronts in the Northern South China Sea

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