Water characteristics and circulation of the upper portion of the Japan sea proper water

Senjyu, Tomoharu; Sudo, Hideo

doi:10.1016/0924-7963(93)90029-l

Cited by 68 publications

(45 citation statements)

References 8 publications

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“…Since temperature and salinity accuracies are considered to be 0.02 deg and 0.01 PSU, σ 1 is determined to an accuracy of 0.01 kg m -3 . From observed temperature and salinity values in the UJSPW (Senjyu and Sudo, 1993), we find that the definition of the UJSPW, σ 1 range of 32.00-32.05 kg m -3 , and the core of the UJSPW, σ 1 32.03 kg m -3 surface, correspond to the range of σ θ = 27.31-27.34 kg m -3 and 27.32 kg m -3 surface, respectively.…”

Section: Datamentioning

confidence: 99%

“…In the previous paper (Senjyu and Sudo, 1993), it is shown from a few observations that the UJSPW can be defined as having a σ 1 range of 32.00-32.05 kg m -3 . Further, it is necessary to establish overall relationships between σ 1 and water properties of the Japan Sea Proper Water.…”

Section: Vertical Distribution Of the Water Properties And Its Seasonmentioning

confidence: 99%

“…However, Sudo (1986) pointed out that the water can be divided into an upper portion and a deep water at the depth of potential temperature (referred to sea surface) 0.1°C (about 800-1000 m depth), where vertical discontinuities of salinity and dissolved oxygen are often seen. Recently, on the basis of hydrographic data taken from a few synoptic observations, it is shown that the upper portion of the Japan Sea Proper Water (UJSPW) can be defined as having a σ 1 (potential density referred to 1000 db) range of 32.00 to 32.05 kg m -3 (Senjyu and Sudo, 1993).…”

Section: Introductionmentioning

confidence: 99%

“…Senjyu and Sudo (1993) have attempted to trace the UJSPW with pycnostad thickness and distributions of depth and water properties, mainly dissolved oxygen, on isopycnal surfaces. They suggested that the UJSPW is formed by wintertime convection in the western region, probably off the Siberian coast west of 136°E between 40° and 43°N, and advected southward to southwestward.…”

Section: Introductionmentioning

confidence: 99%

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The upper portion of the Japan Sea Proper Water; Its source and circulation as deduced from isopycnal analysis

Senjyu

Sudo

1994

J Oceanogr

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All of the available hydrographic station data (temperature, salinity, dissolved oxygen, phosphate and nitrate) taken in various seasons from 1964 to 1985 are analyzed to show where the upper portion of the Japan Sea Proper Water (UJSPW) is formed and how it circulates. From vertical distributions of water properties, the Japan Sea Proper Water can be divided into an upper portion and a deep water at the σ 1 (potential density referred to 1000 db) depth of 32.05 kg m -3 surface. The UJSPW in the north of 40°N increases in dissolved oxygen contents and decreases in phosphate contents in winter, while no significant seasonal variation is seen in the south of 40°N. Initial nutrient contents calculated from relationships between AOU and nutrients on isopycnal surfaces show no significant regional difference in the Japan Sea; this suggests that the UJSPW has originated from a single water mass. From depth, dissolved oxygen and phosphate distributions on σ 1 32.03 kg m -3 surface, core thickness distribution and subsurface phosphate distribution, it is inferred that the UJSPW is formed by the wintertime convection in the region west of 136°E between 40° and 43°N, and advected into the region west of the Yamato Rise along the Continent; finally, it must enter into the Yamato Basin.

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Section: Datamentioning

confidence: 99%

Section: Vertical Distribution Of the Water Properties And Its Seasonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The upper portion of the Japan Sea Proper Water; Its source and circulation as deduced from isopycnal analysis

Senjyu

Sudo

1994

J Oceanogr

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“…According to , JSIW and HSIW were defined as the water with temperature higher than 1.0øC and salinity lower than 34.06 psu and that with temperature higher than 0.6øC and salinity higher than 34.07 psu, respectively. On the basis of many previous papers [Sudo, 1986;Senjyu and Sudo, 1993 Table 2). Before TWCW outcrops, its density is 26.60-26.80 o0 (F03 in Figure 10), but after outcropping, its density increases to >27.00 o0 (C13 in Figure 10 Table 2).…”

Section: A Possible Formation Mechanism Of Hsiwmentioning

confidence: 99%

High‐salinity intermediate water of the Japan Sea in the eastern Japan Basin

Watanabe¹,

Hirai²,

Yamada³

2001

J. Geophys. Res.

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Abstract. Conductivity-temperature-depth data from the midwinter in 1997 are examined for the presence of the intermediate water in the eastern Japan Basin, in the northern part of the Japan Sea. Three different water masses can be detected with salinity extrema at intermediate depths between the main pycnocline and the upper portion of the Japan Sea Proper Water (UJSPW). The shallower salinity maximum and the middle salinity minimum can be identified as the Tsushima Warm Current Water (TWCW) and Japan Sea Intermediate Water, respectively. The deeper salinity maximum water, with high temperature and high dissolved oxygen, is identified as High-Salinity Intermediate Water (HSIW) and has density similar to UJSPW (27.30-27.33 o0). Isopycnal analyses indicate that HSIW flows southeastward from the Siberian coast, where TWCW outcrops and has an opportunity to become denser by direct cooling. We conclude that TWCW is the origin of HSIW, which in turn, is a source for UJSPW.

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Abyssal water mass exchange between the Japan and Yamato Basins in the Japan Sea

Senjyu

Aramaki

Tanaka

et al. 2013

J. Geophys. Res. Oceans

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Bottom water exchange between the Japan and Yamato Basins in the abyssal Japan Sea is investigated based on data from two research cruises in June 2010 and June 2011. Distributions of water properties and velocity profiles from CTD/LADCP observations revealed a two‐layer water mass exchange in a rotating system. The cold Japan Basin Bottom Water (JBBW) with high dissolved oxygen (DO) concentrations flowed into the Yamato Basin along the northern boundary of the channel connecting the basins, while the warmer, lower‐DO Yamato Basin Bottom Water (YBBW) extended over the JBBW along the southern periphery of the channel. A benthic front between the JBBW and YBBW was observed in both cruises, though the front shifted to the northeast in 2011 compared with its 2010 location. Further, the bottom flows in the channel were not unidirectional in 2011, though consistent southwestward flows were observed in 2010. The JBBW transport into the Yamato Basin was also larger in 2010 than in 2011. Analysis of historical hydrographic data showed that the benthic front exists mostly in the narrowest region of the channel, though it fluctuates temporarily to the northeast or southwest. The fluctuation of the benthic front appears to be associated with the JBBW transport because the observations in June 2010 and June 2011 were carried out during periods of southwestward extension of cold water and northeast protrusion of warm water, respectively. A relationship between benthic front displacements and mesoscale warm eddy migrations is suggested.

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Water characteristics and circulation of the upper portion of the Japan sea proper water

Cited by 68 publications

References 8 publications

The upper portion of the Japan Sea Proper Water; Its source and circulation as deduced from isopycnal analysis

The upper portion of the Japan Sea Proper Water; Its source and circulation as deduced from isopycnal analysis

High‐salinity intermediate water of the Japan Sea in the eastern Japan Basin

Abyssal water mass exchange between the Japan and Yamato Basins in the Japan Sea

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