Tidal front and its relation to the biological process in coastal water

Sun, Youn-Jong; Cho, Yang‐Ki

doi:10.1007/s12601-010-0022-3

Cited by 19 publications

(11 citation statements)

References 48 publications

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“…Joint action of small-scale three-dimensional and larger-scale horizontal turbulence leads to quick formation of mixed waters, saturated by nutrients and minerals of terrestrial as well as sea origin. Leading role in spreading these waters over the shelf zone belongs to tides, so tidal fronts and related to them biological processes are of special interest [14]. Tidal fronts are not lines, but more or less wide zones with intense horizontal and vertical motions.…”

Section: Resultsmentioning

confidence: 99%

Features of Internal Waves in a Shoaling Thermocline

Navrotsky¹,

Liapidevskii

Pavlova³

2013

IJG

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Observations and numeric modeling of internal wave generation and transformation in the shelf zone of sea show that the main part of tidal energy is transported to shores in form of internal gravitational waves. Long-term measurements of temperature and current velocity fluctuations at many levels in the near-bottom thermocline were carried out during the periods when stable seasonal thermocline was present. Analysis of the measurements permits us to understand mechanisms of internal wave destruction with turbulent motion generation and corresponding rebuilding of velocity and density mean fields in the stratified near-bottom layer. Spectral analysis of temperature fluctuations shows that in shoaling internal waves the low-frequency maxima disappear, maxima at higher frequencies appear, and the spectra slope in the high frequency range changes with depth. Taking into account the concurrent analysis of near-bottom pressure fluctuations and current velocity fluctuations from surface till bottom we come to the conclusion that breaking internal waves in a near-bottom thermocline generate not only small-scale three-dimensional turbulence, but also quasi-horizontal turbulence of larger scales, which considerably contributes into mixing and sediments, alluvium, and nutrients transport in the shelf zone of sea.

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Section: Resultsmentioning

confidence: 99%

Features of Internal Waves in a Shoaling Thermocline

Navrotsky¹,

Liapidevskii

Pavlova³

2013

IJG

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“…The concentration of NO 3 − was high in the eastern YS. In August, the surface temperature was mostly higher than 26 • C and relatively low along the western coast of the Korean Peninsula due to tidal mixing (Sun and Cho, 2010). The YSBCW was colder than 10 • C in the central YS at 50-m depth.…”

Section: Model Validationmentioning

confidence: 97%

“…The consumption by phytoplankton was greater than the supply by nitrification in all subregions during spring (Figure 14A). Net consumption by biological processes continued in summer in shallow coastal regions, such as the seYS, swYS, and BS (Figure 14B), where active tidal mixing provides favorable conditions for phytoplankton by supplying nitrate to the euphotic layer (Sun and Cho, 2010). Biological uptake was lower than nitrification in offshore regions (i.e., scYS and nYS) with strong stratification in summer, which inhibited the supply of NO 3 − from the lower layer to the surface and, instead, provided a suitable environment for nitrification in the lower layer.…”

Section: Seasonal and Spatial Variations In Nitrate Budgetsmentioning

confidence: 99%

Assessments of Nitrate Budgets in the Yellow Sea Based on a 3D Physical-Biogeochemical Coupled Model

et al. 2022

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Nitrate (NO3–) plays an important role in ecosystems and aquaculture in the Yellow Sea (YS). Sparse observational data suggest that ocean currents and nitrification are crucial to NO3– flux in the YS; however, a quantitative assessment of these fluxes has not yet been performed. This study investigates seasonal and spatial variations in NO3– flux via currents and biological processes in the YS from 2006 to 2019 using a physical-biogeochemical coupled model. The model results show that the current-driven fluxes exceeded biological processes in the eastern and central regions of the YS, unlike in the western and northern regions. Advection of NO3– in the YS is mainly driven by cyclonic circulation in summer and fall, and anticyclonic circulation in spring and winter. The Subei Coastal Current along the coast of China plays a primary role in net advective influx of NO3– to the YS year round. The NO3– influx by the Yellow Sea Warm Current along the lower layer of the southcentral YS is offset by outflux through wind-driven surface currents in winter. The southward movements of the Yellow Sea Bottom Cold Water in summer and the Korean Coastal Current in winter are major NO3– outfluxes to the East China Sea. In terms of biological processes, NO3– is mainly consumed by phytoplankton during the spring bloom and supplied through organic matter decomposition and nitrification. Net supply of NO3– by biological processes was the greatest in the southcentral YS where the Yellow Sea Bottom Cold Water is present.

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“…Nutrients brought to the surface in areas of vertical mixing are a potential source to support 'new production' (sensu Dugdale & Goering, 1967) by phytoplankton after they have been transported laterally to the tidal frontal (and adjacent stratified) areas (e.g. Pingree et al, 1976;Takeoka et al, 1993;Sun & Cho, 2010). The importance of the vertically mixed areas on phytoplankton dynamics in the surrounding area is thus of interest (e.g.…”

Section: Introductionmentioning

confidence: 99%

Importance of light status on phytoplankton biomass in the turbid Bisan Strait, Japan: results from a high-frequency sampling study

et al. 2021

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The dynamics of phytoplankton biomass in the vertically mixed south-eastern part of the Bisan Strait, in the Seto Inland Sea of Japan, may be considered to be strongly dependent not only on nutrients but also on light status. This was investigated by examining variations in chlorophyll-a (Chl-a), nutrients, and Secchi-disc depth through high-frequency sampling (a mean of once every 1.7 days) at the same station from April to October 2019. Precipitation during the Japanese rainy season (East Asian monsoon rains) was associated with a decrease in salinity from 32 to 31 in late July. The highest concentration of dissolved inorganic nitrogen (DIN), the most deficient nutrient, also was recorded in late July in association with seasonal precipitation. However, the measured Chl-a peak (max. 4 μg l−1) in early August was not as high as expected, possibly due to low water clarity. A relatively small but substantial peak of DIN (max. 4 μM) was recorded in mid-August, which coincided with the passing of a typhoon. The small peak of DIN coupled with higher water clarity thereafter was followed by a phytoplankton bloom from mid-August to early September, at which the highest Chl-a (7 μg l−1) occurred. It is suggested that increased light penetration enhanced the efficiency of nutrient assimilation and thereby triggered the late-summer phytoplankton bloom. In contrast to the adjacent stratified areas, light rather than nutrient status appears to be the key determinant for the onset of phytoplankton blooms in the Bisan Strait.

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Tidal front and its relation to the biological process in coastal water

Cited by 19 publications

References 48 publications

Features of Internal Waves in a Shoaling Thermocline

Features of Internal Waves in a Shoaling Thermocline

Assessments of Nitrate Budgets in the Yellow Sea Based on a 3D Physical-Biogeochemical Coupled Model

Importance of light status on phytoplankton biomass in the turbid Bisan Strait, Japan: results from a high-frequency sampling study

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