How the Kuroshio Current Delivers Nutrients to Sunlit Layers on the Continental Shelves With Aid of Near‐Inertial Waves and Turbulence

@article{Nagai2019HowTK,
  title={How the Kuroshio Current Delivers Nutrients to Sunlit Layers on the Continental Shelves With Aid of Near‐Inertial Waves and Turbulence},
  author={Takeyoshi Nagai and Gloria Silvana Dur{\'a}n and Diego Andr{\'e} Otero and Yasutaka Mori and N. Yoshie and Kazuki Ohgi and Daisuke Hasegawa and Ayako Nishina and Toru Kobari},
  journal={Geophysical Research Letters},
  year={2019},
  volume={46},
  pages={6726 - 6735}
}
The Kuroshio Current carries a large amount of nutrients in dark subsurface layer along the southern coast of Japan. However, due to lack of sufficient multidisciplinary high‐resolution observations, it has been unclear whether and how the subsurface nutrients are injected to sunlit layers on the continental shelf. In this study, using a state‐of‐the‐art tow‐yo microstructure profiler and nitrate measurements, we show that the Kuroshio flowing on the shelfbreak induces very strong turbulent… 

Elevated Nutrient Supply Caused by the Approaching Kuroshio to the Southern Coast of Japan

Although the Kuroshio Current has been well-known for being nutrient poor in its upper layers, it sustains a great biodiversity within its region, including the Kuroshio Extension. Previous studies

Vertical fluxes of nutrients enhanced by strong turbulence and phytoplankton bloom around the ocean ridge in the Luzon Strait

Measurements of microstructure turbulence and biogeochemical hydrography along 21°N in the Luzon Strait during the R/V Hakuho Maru cruise in November 2017 suggest that enhanced turbulent mixing promotes nutrient supply to the euphotic zone and generates new production within the surface layer, contributing to the formation of a quasi-permanent local chlorophyll a bloom north of Itbayat Island on the eastern ridge.

The Kuroshio flowing over seamounts and associated submesoscale flows drive 100-km-wide 100-1000-fold enhancement of turbulence

Although previous studies reported that currents over topographic features, such as seamounts and ridges, cause strong turbulence in close proximity, it has been elusive how far intense turbulence

Elevated turbulent and double-diffusive nutrient flux in the Kuroshio over the Izu Ridge and in the Kuroshio Extension

While the Kuroshio is known to be a nutrient stream, as these nutrients are in dark subsurface layers, they are not immediately available for photosynthesis unless they are supplied to the sunlit

Enhanced vertical turbulent nitrate flux in the intermediate layer of the Kuroshio in the Tokara Strait

Vertical mixing in the ocean is an important physical process that brings deep nutrients to the upper layer. The Tokara Strait, where the Kuroshio flows out to the North Pacific from the East China

How a Small Reef in the Kuroshio Cultivates the Ocean

Vertical nitrate fluxes associated with turbulent mixing and upwelling around a small reef in the Kuroshio are quantified by continuously deploying a turbulence microstructure profiler with an

Effects of the Coastal Uplift on the Kuroshio Ecosystem, Eastern Taiwan, the Western Boundary Current of the North Pacific Ocean

The Kuroshio is the western boundary current of the North Pacific Ocean. In the subtropical region of eastern Taiwan, a coastal uplift of the isotherms has occurred. To explore its impact on this

Vertical turbulent nitrate flux from direct measurements in the western subarctic and subtropical gyres of the North Pacific

Vertical turbulent nitrate fluxes were estimated in the western North Pacific from direct measurements of vertical turbulent mixing and vertically continuous nitrate profiles during the summer of

Phytoplankton Increase Along the Kuroshio Due to the Large Meander

The Kuroshio Large Meander (LM) is known to be highly aperiodic and can last from 1 to 10 years. Since a stationary cold core formed between the Kuroshio and the southern coast of Japan off

Spatiotemporal evolution of submesoscale filaments at the periphery of an anticyclonic mesoscale eddy north of the Kuroshio Extension

Five high-resolution hydrographic sections were conducted at the periphery of an anticyclonic mesoscale eddy north of the Kuroshio Extension (KE) to explore the evolution of submesoscale structure in

References

SHOWING 1-10 OF 35 REFERENCES

The North Atlantic nutrient stream

Western boundary currents are the locus of intense nutrient transport, or nutrient streams. The largest fraction of this transport takes place in the upper-thermocline layers, between the surface

Observations of vertical turbulent nitrate flux across the Kuroshio

The vertical turbulent nitrate flux was calculated across the Kuroshio based on direct turbulence measurements and nitrate concentrations. Profile data were analyzed relative to the main axis of the

Evidence of enhanced turbulent dissipation in the frontogenetic Kuroshio Front thermocline

Enhanced turbulent dissipation, O(10−8–10−7) Wkg−1 in the thermocline on the cyclonic side of the Kuroshio Front was observed during a period of frontogenesis, using a microstructure profiler, XBT

Direct observations of microscale turbulence and thermohaline structure in the Kuroshio Front

[1] Direct observations of microstructure near the Kuroshio Front were conducted in August 2008 and October 2009. These show negative potential vorticity (PV) in the mixed layer south of the front,

Observations of Energetic High-Wavenumber Internal Waves in the Kuroshio

Abstract Intense and spatially coherent shear layers were detected in and under the Kuroshio in an April 2000 survey in the East China Sea. The sloping layers, revealed by shipboard Doppler sonars on

Turbulent mixing within the Kuroshio in Tokara Strait

Turbulent mixing and background current were observed using a microstructure profiler and acoustic Doppler current profilers in the Tokara Strait, where many seamounts and small islands exist within

Observations of the structure of turbulent mixing across the Kuroshio

The mean structure of turbulence intensity across the Kuroshio in spring is presented by compositing microstructure profiles on a stream coordinate. The composite mean of turbulent energy dissipation

Spatial variations in the Kuroshio nutrient transport from the East China Sea to south of Japan

Based on absolute geostrophic velocity, which was calculated using repeated hydrographic data of 39 cruises from 2000 to 2009 and nitrate concentrations measured in the same areas from 1964 to 2009,

Dominant role of eddies and filaments in the offshore transport of carbon and nutrients in the California Current System

The coastal upwelling region of the California Current System (CalCS) is a well-known site of high productivity and lateral export of nutrients and organic matter, yet neither the magnitude nor the

Nutrient transport and mixing in the Gulf Stream

The distribution of nutrient flux (geostrophic velocity times concentration) in five sections across the Gulf Stream-North Atlantic Current (from the Florida Straits to 35°W) is characterized by an