Velocity Field of the Oyashio Region Observed with Satellite-Tracked Surface Drifters during 1999–2000

Ohshima, Κay I.; Wakatsuchi, Masaaki; Saitoh, Sei–Ichi

doi:10.1007/s10872-006-0004-3

Cited by 16 publications

(4 citation statements)

References 18 publications

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“…As is seen in Figure 8a, the largest spectral peak of baroclinic motions along y = 250 km (near the ridge) occurs at the K 1 tidal frequency. Figure 9 shows the spatial distribution of the harmonically analyzed along‐isobath K 1 tidal velocity at the ocean surface at each phase during the final one tidal period, which suggests the existence of coastal trapped waves (CTWs) propagating clockwise around each island [ Rabinovich and Thomson , 2001; Ohshima et al , 2005].…”

Section: Resultsmentioning

confidence: 99%

Numerical study of K₁ internal tides in the Kuril straits

Tanaka¹,

Hibiya²,

Niwa³

et al. 2010

J. Geophys. Res.

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Tide‐induced strong diapycnal mixing in the Kuril straits is thought to be one of the essential processes controlling water mass formation in the North Pacific. In order to make a definite quantification of diapycnal diffusivity in the Kuril straits, we drive a three‐dimensional numerical model and examine the generation, propagation, and dissipation features of internal waves which play an essential role in transferring energy from the predominant K1 barotropic tide to diapycnal mixing processes. It is shown that most of the internal wave energy subtracted from the K1 barotropic tide is dissipated within the Kuril straits such that the local dissipation efficiency becomes 0.8–1.0, about three times the value previously employed. This is because the K1 tidal frequency is subinertial in this area so that significant amount of K1 tidal energy is fed into coastal trapped waves (CTWs) which stay around each island without propagating away from the straits; CTWs induce strong velocity shear near the ocean bottom causing bottom‐confined intense mixing with a vertical decay scale ∼200 m, less than half the value previously employed, although there remains some uncertainties resulting from the employed parameterizations of viscosity and diffusivity. The average diapycnal diffusivity in the Kuril straits becomes ∼25 × 10−4 m2 s−1, about three times the value previously estimated, although it is still an order of magnitude less than assumed for the Kuril straits in the existing ocean general circulation models.

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Section: Resultsmentioning

confidence: 99%

Numerical study of K₁ internal tides in the Kuril straits

Tanaka¹,

Hibiya²,

Niwa³

et al. 2010

J. Geophys. Res.

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“…The resulting residence time of pMn at station 2 is 415 ± 251 days (NBST) or 265 ± 177 days (CLAP). This pMn residence time exceeds the 54-108 days required for the Oyashio Current to travel from station 3 to station 1 (1860 km), assuming a velocity of 0.2-0.4 m/s (Ohshima et al, 2005), allowing the concentrations of pMn (and other elements associated with the Mn particles) to accumulate within the Oyashio waters and be transported offshore.…”

Section: Particulate Mn Removal Via Settling Particlesmentioning

confidence: 92%

“…The shelf fluxes of Mn, Co, and Ce to the WSG can be estimated using the increase in concentrations from station 3 to 1 (1860 km), assuming a current velocity of 0.2-0.4 m s −1 for the Oyashio Current (Ohshima et al, 2005). Within the 26.4 σ θ water mass, the dMn concentrations increase from 1.34 nM to 2.91 nM, an increase of 1.57 nM over 54-108 days.…”

Section: Shelf Fluxes To the Wsgmentioning

confidence: 99%

Shelf Inputs and Lateral Transport of Mn, Co, and Ce in the Western North Pacific Ocean

et al. 2019

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The margin of the western North Pacific Ocean releases redox-active elements like Mn, Co, and Ce into the water column to undergo further transformation through oxide formation, scavenging, and reductive dissolution. Near the margin, the upper ocean waters enriched in these elements are characterized by high dissolved oxygen, low salinity, and low temperature, and are a source of the North Pacific Intermediate Water. High dissolved concentrations are observed across the Western Subarctic Gyre, with a rapid decrease in concentrations away from the margin and across the subarcticsubtropical front. The particulate concentrations of Mn, Co, and Ce are also high in the subarctic surface ocean and enriched relative to Ti and trivalent rare earth elements. Furthermore, the particles enriched in Mn, Co, and Ce coincide at the same depth range, suggesting that these elemental cycles are coupled through microbial oxidation in the subarctic gyre as the waters travel along the margin before being subducted at the subarctic-subtropical front. Away from the margin, the Mn, Co, and Ce cycles decouple, as Mn and Ce settle out as particles while dissolved Co is preserved and transported within the North Pacific Intermediate Water into the central North Pacific Ocean.

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“…1). In the Pacific Ocean, the Oyashio Current, which contains low-temperature, low-salinity, and nutrientrich water, flows southwestward along the Kuril Arc and Hokkaido Island at a low velocity (0.2-0.4 m s −1 ) (Isoguchi et al, 1997;Suzuki et al, 2003;Ohshima et al, 2005; Fig. 1).…”

Section: Ocean Currentsmentioning

confidence: 99%

Deposition pattern and sources of palynomorphs on the continental margin off Hokkaido Island, northwest Pacific

Igarashi¹,

Yamamoto

Noda

et al. 2015

Marine Geology

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Velocity Field of the Oyashio Region Observed with Satellite-Tracked Surface Drifters during 1999–2000

Cited by 16 publications

References 18 publications

Numerical study of K₁ internal tides in the Kuril straits

Numerical study of K₁ internal tides in the Kuril straits

Shelf Inputs and Lateral Transport of Mn, Co, and Ce in the Western North Pacific Ocean

Deposition pattern and sources of palynomorphs on the continental margin off Hokkaido Island, northwest Pacific

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Velocity Field of the Oyashio Region Observed with Satellite-Tracked Surface Drifters during 1999–2000

Cited by 16 publications

References 18 publications

Numerical study of K1 internal tides in the Kuril straits

Numerical study of K1 internal tides in the Kuril straits

Shelf Inputs and Lateral Transport of Mn, Co, and Ce in the Western North Pacific Ocean

Deposition pattern and sources of palynomorphs on the continental margin off Hokkaido Island, northwest Pacific

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Numerical study of K₁ internal tides in the Kuril straits

Numerical study of K₁ internal tides in the Kuril straits