Meridional transport of the North Pacific Intermediate Water in the Kuroshio‐Oyashio Interfrontal Zone

Yoshinari, Hiroshi; Yasuda, Ichiro; Ito, Shin; Firing, Eric; Matsuo, Yutaka; Katoh, Osamu; Shimizu, Yoshihisa

doi:10.1029/2000gl012690

Cited by 13 publications

(12 citation statements)

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“…The θ K and S K are the reference potential temperature and salinity of the pure Kuroshio water; the S O and θ O are those of the pure Oyashio water. This type of evaluation for the waters in the area east of Japan was used previously by Talley et al [1995], Yasuda et al [1996], Talley [1997], Yasuda [1997], Shimizu et al [2001], Yasuda et al [2001], Yoshinari et al [2001], and Hiroe et al [2002]. The assumption of isopycnal mixing in the density range of 26.7–27.4σ θ was validated with chemical tracers [ Ono et al , 1998; Andreev et al , 2001].…”

Section: Datamentioning

confidence: 99%

Intermediate water circulation in the North Pacific subarctic and northern subtropical regions

Ueno

Yasuda

2003

J. Geophys. Res.

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[1] The intermediate water circulation in the North Pacific subarctic and northern subtropical regions is investigated through inverse analysis, focusing on the volume and heat transports from the subtropical to the subarctic regions. The inverse method we adopted is a hybrid method of b-spiral and box inverse methods which permits diapycnal flux. The isopycnal velocities estimated through the inverse analysis are mostly consistent with the oxygen distribution and support the hypothesis that warm and saline intermediate water is transported from the transition domain east of Japan to the northern Gulf of Alaska. The northward volume transport across 46°N between 158°E and 130°W is estimated to be À0.2 to 5.3 Sv in the density range of 26.7-27.2s q . The upward diapycnal transports in the open subarctic North Pacific (region N) across 26.7 and 27.2s q isopycnal surfaces are estimated to be 0.2 to 1.5 Sv and À0.2 to 0.9 Sv, respectively. Part of the water transported upward across 26.7s q might outcrop and be carried to the subtropical region by the southward Ekman drift. Through the examination of heat balance of the intermediate layer in the subarctic region, it is suggested quantitatively that the intermediate heat transport from the south plays an essential role in maintaining the heat of the mesothermal waters in the subarctic region.

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Section: Datamentioning

confidence: 99%

Intermediate water circulation in the North Pacific subarctic and northern subtropical regions

Ueno

Yasuda

2003

J. Geophys. Res.

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“…Similar procedures were adopted by Yasuda et al [2001] in which the two velocities were compared in depth coordinates. We compared the two velocity profiles in density coordinates at 0.01σ θ intervals in the range of 26.4–27.5σ θ as in the work of Yoshinari et al [2001]. One example of the derivation procedure of the LADCP‐adjusted geostrophic velocity is shown in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

“…The potential temperatures and salinities of the pure Kuroshio and Oyashio waters in each 0.1σ θ ‐averaged isopycnal layer are given in Table 1 of Yasuda et al [2001]. Here we used an averaged mixing ratio R = ( R O θ + R OS )/2 as in the work of Yoshinari et al [2001] and Shimizu et al [2001]. Similar procedures were done in previous studies [ Talley et al , 1995; Yasuda et al , 1996; Talley , 1997; Kono , 1998; Yasuda et al , 2001; Hiroe et al , 2002].…”

Section: Methodsmentioning

confidence: 99%

“…NPIW in the K/O zone is then maintained mainly by the northward transport of the new NPIW formed near the KE. A schematic illustration of two possible routes of the Oyashio water in the K/O zone is shown in Figure 1 of Yoshinari et al [2001].…”

Section: Introductionmentioning

confidence: 99%

“…In section 4, results of the transport estimates are demonstrated, and we describe differences in the circulation west and east of the Shatsky Rise. Finally, in section 5, results are summarized and we discuss the NPIW formation in the K/O zone using a transport budget analysis differed from Yoshinari et al [2001].…”

Section: Introductionmentioning

confidence: 99%

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Meridional transport of North Pacific Intermediate Water across 37°N based on an objective analysis of lowered acoustic Doppler current profiler data

2004

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Meridional transport and origin of North Pacific Intermediate Water (NPIW) in the Kuroshio‐Oyashio interfrontal zone (K/O zone) are examined using hydrographic and lowered acoustic Doppler current profiler (LADCP) velocity data along 37°N obtained in July 1998. An optimal interpolation method was applied to objectively derive transports and their spatial‐interpolation errors. A statistically significant northward transport of 12.0 ± 4.6 Sv was observed in the density interval 26.6–27.5σθ between the coast (141°E) and the Shatsky Rise (157°E). In the upper part of NPIW (26.6–27.0σθ), the total transport was 4.1 ± 1.2 Sv, of which the Kuroshio component was 3.0 ± 0.7 Sv and Oyashio was 1.1 ± 0.5 Sv. In the lower NPIW (27.0–27.5σθ), the total transport was 7.9 ± 3.4 Sv, comprising 4.7 ± 1.9 Sv of Kuroshio water and 3.2 ± 1.5 Sv of Oyashio water. A southward transport of 4.4 ± 3.6 Sv was observed between the Shatsky Rise and 179.5°E in the density interval 26.6–27.5σθ. In the region west of the Shatsky Rise, the Oyashio mixing ratio derived from temperature and salinity in the K/O zone is larger than the ratio of Oyashio to Kuroshio transport, implying southward transport of 1 Sv of Oyashio water across the Oyashio Front in the upper NPIW. Mixing and transport ratios are almost the same in the lower NPIW, suggesting that this region is maintained only by the northward transport of NPIW formed near the Kuroshio Extension.

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Importance of eddy representation for modeling the intermediate salinity minimum in the North Pacific: Comparison between eddy-resolving and eddy-permitting models

Ishikawa

Ishizaki²

2009

J Oceanogr

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Meridional transport of the North Pacific Intermediate Water in the Kuroshio‐Oyashio Interfrontal Zone

Abstract: Abstract.Meridional

Cited by 13 publications

References 10 publications

Intermediate water circulation in the North Pacific subarctic and northern subtropical regions

Intermediate water circulation in the North Pacific subarctic and northern subtropical regions

Meridional transport of North Pacific Intermediate Water across 37°N based on an objective analysis of lowered acoustic Doppler current profiler data

Importance of eddy representation for modeling the intermediate salinity minimum in the North Pacific: Comparison between eddy-resolving and eddy-permitting models

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