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1

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Moored instrument observations in the Kuroshio south of Kyushu (1986)

Takematsu, Masaki ; Kawatate, Kazuo ; Koterayama, Wataru ; [et al.]

Springer

Journal of oceanography 42 (1986), S. 201-211

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ISSN: 1573-868X

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract In each of the (fiscal) years 1979–1982, multilayer current measurements by means of moored instruments were carried out in the Kuroshio off Tanegashima Island, south of Kyushu, with particular interest in the baroclinic layer (0–1,000 m) of the intense current. Most of the moored instruments were in position for more than 30 days, the maximum duration being 145 days. This paper describes some noticeable features of the mean and fluctuation fields in the surface Kuroshio as inferred from the the new data sets. Vertical profiles of horizontal velocities show that the eastward current of the Kuroshio in the region is confined to the upper 600 m on average and below this level the mean current is directed to the southwest along the local isobaths. This is believed to be the first observation of the “level of no motion” in this region. It is argued that the indicated level of no motion would lead to much smaller values for the Kuroshio transport than previous values referred to the 1,000 m level — for example, earlier estimates by Nitani (1972). The fluctuation field in the upper intense current appears to be dominated by an organized motion with a time scale of about 30 days. This can be seen clearly in the time variations of water temperature and local volume transport, but less clearly in the velocity records. The horizontal transfer components of momentum and heat are calculated and it is suggested that the transverse momentum transfer, U′V′ tends to be negative (offshore) in the region of anticyclonic shear of the upper Kuroshio; no evidence for a “negative eddy viscosity effect” is found.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02109354

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2

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Direct Measurements of Deep Currents in the Northern Japan Sea (1999)

Takematsu, Masaki ; Nagano, Zentaro ; Ostrovski, Alexander G. ; [et al.]

Springer

Journal of oceanography 55 (1999), S. 207-216

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ISSN: 1573-868X

Keywords: Japan Basin ; subsurface moorings ; strong deep circulation ; eddy-like currents ; seasonal changes ; Liman Current

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract Long-term current measurements by means of subsurface moorings were made for the first time at seven sites in the Japan Basin, the northern part of the Japan Sea. The objective was to directly explore the velocity field in the highly homogeneous deep water mass (the Japan Sea Proper Water) that occupies depths below 500 m. On each mooring three current meters were equipped at an approximately equal distance below about 1000 m depth. Duration of the measurements was 1 to 3 years depending on specific site. This paper describes the basic data set from the moored measurements. It is found that the deep water of the Japan Basin is very energetic with eddies and vertically coherent currents of the order of 0.1 m/s. Surprisingly, the currents and eddies exhibit strong seasonal dependence even in the deepest layers of the Basin. The observed new current features are discussed in comparison with conventional deep circulation pictures derived from hydrographic data.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1007842013257

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3

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Comment on Fujinawa's paper on the growth rate of wind waves (1975)

Takematsu, Masaki

Springer

Journal of oceanography 31 (1975), S. 174-175

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ISSN: 1573-868X

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02107108

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4

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Basin-To-Basin and Year-To-Year Variation of Temperature and Salinity Characteristics in the East Sea (Sea of Japan) (1999)

Kim, Kuh ; Kim, Young-Gyu ; Cho, Yang-Ki ; [et al.]

Springer

Journal of oceanography 55 (1999), S. 103-109

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ISSN: 1573-868X

Keywords: East Sea (Sea of Japan ; T-S characteristics ; intermediate waters ; year-to-year variation

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract Analysis of CTD data from four CREAMS expeditions carried out in summers of 1993–1996 produces distinct T-S relationships for the western and eastern Japan Basin, the Ulleung Basin and the Yamato Basin. T-S characteristics are mainly determined by salinity as it changes its horizontal pattern in three layers, which are divided by isotherms of 5°C and 1°C; upper warm water, intermediate water and deep cold water. Upper warm water is most saline in the Ulleung Basin and the Yamato Basin. Salinity of intermediate water is the highest in the eastern Japan Basin. Deep cold water has the highest salinity in the Japan Basin. T-S curves in the western Japan Basin are characterized by a salinity jump around 1.2–1.4°C in the T-S plane, which was previously found off the east coast of Korea associated with the East Sea Intermediate Water (Cho and Kim, 1994). T-S curves for the Japan Basin undergo a large year-to-year variation for water warmer than 0.6°C, which occupies upper 400 m. It is postulated that the year-to-year variation in the Japan Basin is caused by convective overturning in winter.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1007873525552

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5

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Barotropic instability of a viscous boundary jet (1988)

Yamashita, Iwao ; Takematsu, Masaki

Springer

Journal of oceanography 44 (1988), S. 81-93

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ISSN: 1573-868X

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract The barotropic instability of a boundary jet on a beta plane is considered with emphasis on the effect of internal viscosity. An eigenvalue problem for the disturbance equations and its inviscid version are solved by the aid of numerical methods, and instability characteristics are determined as functions of the Reynolds numberR for various values of the beta-parameter. Typical disturbance structures (eigenfunctions) are also computed. Numerical examples show that the minimum critical Reynolds numberR cr for instability is smaller than 100. At a Reynolds number of the order of hundreds, there appears a second mode of instability in addition to the first unstable mode originating atR cr ; a kind of ‘resonance’ between the first and second eigenvalues occurs at the particular value ofR. The neutral stability curves are accordingly multi-looped. Although each of the two unstable modes asymptotically approaches its inviscid counterpart asR→∞, the asymptotic approach to the inviscid limit is rather slow and the effect of varyingR is conspicuous even atR∼O (104). It is thus demonstrated that the Reynolds number is an essential stability parameter for real boundary jets.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02303123

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6

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Observations of Eddies in the Japan Basin Interior (1999)

Takematsu, Masaki ; Ostrovski, Alexander G. ; Nagano, Zentaro

Springer

Journal of oceanography 55 (1999), S. 237-246

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ISSN: 1573-868X

Keywords: Japan Basin ; mesoscale eddies ; SST imagery ; WOCE drifters ; moored current meter data ; anticyclonic barotropic eddies

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract Eddy features in the Japan Basin have been studied by combining satellite-derived sea surface temperature (SST) images and WOCE drifter tracks with recent current meter data from a deep mooring in the interior of the Basin. SST images indicate that anticyclonic eddies often appear around the Subpolar Front in cold seasons and move into the northern cold water region entraining warm water of the frontal zone. The anti-cyclonic eddies "visualized" by the entrained warm water and trajectories of some drifters are typically 30 km in radius and have rotational speeds of 0.15 to 0.3 m/s at the surface. On the other hand, the current meter data of 3-year duration show that vertically coherent eddy-like currents of the order of 0.1 m/s occur every year in cold seasons in the deep (1000 to 3000 m) layer of the Japan Basin interior. An important finding is that available time series of SST patterns are well correlated to the vertically coherent deep currents. This correlation suggests that the anticyclonic eddies indicated by both SST images and drifter tracks are actually barotropic or quasi-barotropic, extending from the surface to the bottom. It is argued that the unique current features in the deep layer of the Japan Basin can be explained in terms of barotropic eddies. A brief discussion is also made of the possible source of the eddy kinetic energy.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1007846114165

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