Evolution of submesoscale coastal frontal waves in the East China Sea based on geostationary ocean color imager observational data

Yin, Wenbin; Huang, Daji

doi:10.1002/2016gl070232

Cited by 16 publications

(24 citation statements)

References 33 publications

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“…A similar feature to the modeled cyclone was observed in a section across the western Alborán Gyre (Figure 1b and 1c, near 50 km). Frontal waves and eddies that are qualitatively similar to this modeled feature and the feature on the Alborán Gyre observations have been observed previously, mostly from satellites and photographs from space shuttles, and have been attributed to both shear instability and baroclinic instability (Klymak et al, 2016;Munk et al, 2000;Yin & Huang, 2016). In both cases, the waves are observed to become unstable in 2-3 days and have wavelengths of 20-30 km, consistent with the modeled features.…”

Section: Cut-off Cyclonessupporting

confidence: 86%

Coherent Pathways for Subduction From the Surface Mixed Layer at Ocean Fronts

Freilich¹,

Mahadevan

2021

JGR Oceans

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The exchange of properties between the ocean and atmosphere, including heat, carbon, and oxygen, is affected by subduction, which is the transport of water from the surface mixed layer into the stratified pycnocline. Subduction ventilates the pycnocline, affects the water mass characteristics of the interior, and impacts the ocean's biogeochemistry. The seasonal transformation of the mixed layer and the large-scale circulation (Lévy et al., 2013;Nurser & Marshall, 1991) leads to subduction through diabatic processes. In addition, subduction occurs along sloping isopycnals at fronts, where mixed-layer enhanced submesoscale processes enhance vertical advection on horizontal scales of 0.1-10 km (

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Section: Cut-off Cyclonessupporting

confidence: 86%

Coherent Pathways for Subduction From the Surface Mixed Layer at Ocean Fronts

Freilich¹,

Mahadevan

2021

JGR Oceans

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“…A similar feature to the modeled cyclone was observed in a section across the western Alborán Gyre (Figure 4-1B,C, near 50 km). Frontal waves and eddies that are qualitatively similar to this modeled feature and the feature on the Alborán Gyre observations have been observed previously, mostly from satellites and photographs from space shuttles, and have been attributed to both shear instability and baroclinic instability (Munk et al, 2000;Yin and Huang, 2016;Klymak et al, 2016). In both cases, the waves are observed to become unstable in 2-3 days and have wavelengths of 20-30 km, consistent with the modeled features.…”

Section: Cut-off Cyclonessupporting

confidence: 85%

Vertical fluxes in the upper ocean

Freilich¹

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Oceanic fronts at the mesoscale and submesoscale are associated with enhanced vertical motion, which strengthens their role in global biogeochemical cycling as hotspots of primary production and subduction of carbon from the surface to the interior. Using process study models, theory, and field observations of biogeochemical tracers, this thesis improves understanding of submesoscale vertical tracer fluxes and their influence on carbon cycling. Unlike buoyancy, vertical transport of biogeochemical tracers can occur both due to the movement of isopycnals and due to motion along sloping isopycnals. We decompose the vertical velocity below the mixed layer into two components in a Lagrangian frame: vertical velocity along sloping isopycnal surfaces and the adiabatic vertical velocity of isopycnal surfaces and demonstrate that vertical motion along isopycnal surfaces is particularly important at submesoscales (1-10 km). The vertical flux of nutrient, and consequently the new production of phytoplankton depends not just on the vertical velocity but on the relative time scales of vertical transport and nutrient uptake. Vertical nutrient flux is maximum when the biological timescale of phytoplankton growth matches the vertical velocity frequency. Export of organic matter from the surface and the interior requires water parcels to cross the mixed layer base. Using Lagrangian analysis, we study the dynamics of this process and demonstrate that geostrophic and ageostrophic frontogenesis drive subduction along density surfaces across the mixed layer base. Along-front variability is an important factor in subduction. Both the physical and biological modeling studies described above are used to interpret observations from three research cruises in the Western Mediterranean. We sample intrusions of high chlorophyll and particulate organic carbon below the euphotic zone that are advected downward by 100 meters on timescales of days to weeks. We characterize the community composition in these subsurface intrusions at a lateral resolution of 1–10 km. We observe systematic changes in community composition due to the changing light environment and differential decay of the phytoplankton communities in low-light environments, along with mixing. We conclude that advective fluxes could make a contribution to carbon export in subtropical gyres that is equal to the sinking flux.

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“…The spatial resolution is 500 m, and the temporal sampling interval is one hour (eight times per day, from 08:16 to 15:16, UTC+8). Research by Choi et al (2014) and Doxaran et al (2014) showed that GOCI-TSS data can also be applied to near-shore high-turbidity waters, and Yin and Huang (2016) used GOCI-TSS data to describe a complete life cycle of the submesoscale coastal frontal waves in the East China Sea. Therefore, using this data to study the short-term spatiotemporal variation of TSS over the Yangtze Bank is reliable.…”

Section: Hourly Tss Data From the Gocimentioning

confidence: 99%

“…. At the same time, the gradient-based frontal outline method (Yin and Huang, 2016) was applied to extract frontal outlines six times per day (from 09:16 to 14:16). However, the TSS images captured at 08:16 and 15:16 could not extract the frontal outlines due to insufficient spatial coverage ( Figure 2).…”

Section: Hourly Tss Data From the Gocimentioning

confidence: 99%

Tidal variation of total suspended solids over the Yangtze Bank based on the geostationary ocean color imager

Zhou

Xuan

Huang

2020

Sci. China Earth Sci.

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Hourly mapping by a Geostationary Ocean Color Imager was used to reveal the spatial pattern and tidal variation of total suspended solids (TSS) over the Yangtze Bank in the Yellow and East China Seas during the winter. The TSS form a tongueshaped structure, which decreases further offshore in a stepwise manner. The stepwise change is separated by two fronts of TSS, which are located near the 20-m and 50-m isobaths. The tidal variation of TSS concentration during the study period is evident and can be divided into three stages: decay, maintenance, and growth. Compared with the relatively stationary TSS during the maintenance stage, drastic changes exist during the decay and growth stages. In terms of tide-induced mixing, the dynamic analysis shows that both the topography and the tidal currents play an important role in the spatio-temporal variation of TSS during the tidal period. In particular, spatial distribution is primarily determined by the topography, whereas the temporal variations in tidal scale are determined by the tidal currents.

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Evolution of submesoscale coastal frontal waves in the East China Sea based on geostationary ocean color imager observational data

Cited by 16 publications

References 33 publications

Coherent Pathways for Subduction From the Surface Mixed Layer at Ocean Fronts

Coherent Pathways for Subduction From the Surface Mixed Layer at Ocean Fronts

Vertical fluxes in the upper ocean

Tidal variation of total suspended solids over the Yangtze Bank based on the geostationary ocean color imager

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