Low-Frequency Current Observations in the Korea/Tsushima Strait*

Teague, William J.; Jacobs, Gregg A.; Perkins, Henry; Book, Jeffrey W.; Chang, Kyung‐Il; Suk, Moon-Sik

doi:10.1175/1520-0485(2002)032<1621:lfcoit>2.0.co;2

Cited by 123 publications

(61 citation statements)

References 26 publications

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“…However, the mechanism responsible for driving the annual cycle of the Throughflow transport remained an open question partly because observations have been insufficient to describe seasonal changes at all three straits, especially at the Soya Strait (Fukamachi et al 2008). Among the three straits, the Tsushima Strait is the most frequently observed [see Teague et al (2006) and reference therein]. Past direct measurements reveal an annual cycle at the Tsushima Strait with a maximum transport from late summer to early fall and a minimum transport in winter ( Fig.…”

Section: A the Observed Annual Cyclementioning

confidence: 99%

“…2a; Fukudome et al 2010). The amplitude of seasonal cycle in transport is about 0.8-1.7 Sv (Isobe et al 2002;Teague et al 2002;Takikawa et al 2005), and the transport in the western half of the strait appears to show a more robust annual cycle (Fukudome et al 2010). Long-term estimates based on the sea level differences across the Tsushima Strait indicate a similar annual cycle (Lyu and Kim 2003;Takikawa and Yoon 2005), although these estimates may contain errors from baroclinic effects (Lyu and Kim 2003).…”

Section: A the Observed Annual Cyclementioning

confidence: 99%

“…The inflow is known as the Tsushima Warm Current, and its annual-mean transport, according to long-term measurements from bottom-mounted ADCP (Teague et al 2002) and ship-mounted ADCP (Isobe et al 2002;Takikawa et al 2005), is about 2.4-2.7 Sv. The Tsushima Warm Current bifurcates to a flow along the coast of Japan and a flow along the Korean Peninsula, which then crosses the Japan Sea zonally at about 408N (Talley et al 2006).…”

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The Annual Cycle of the Japan Sea Throughflow

Kida

Qiu

Yang

et al. 2016

Journal of Physical Oceanography

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The mechanism responsible for the annual cycle of the flow through the straits of the Japan Sea is investigated using a two-layer model. Observations show maximum throughflow from summer to fall and minimum in winter, occurring synchronously at the three major straits: Tsushima, Tsugaru, and Soya Straits. This study finds the subpolar winds located to the north of Japan as the leading forcing agent, which first affects the Soya Strait rather than the Tsushima or Tsugaru Straits. The subpolar winds generate baroclinic Kelvin waves along the coastlines of the subpolar gyre, affect the sea surface height at the Soya Strait, and modify the flow through the strait. This causes barotropic adjustment to occur inside the Japan Sea and thus affect the flow at the Tsugaru and Tsushima Straits almost synchronously. The barotropic adjustment mechanism explains well why the observations show a similar annual cycle at the three straits. The annual cycle at the Tsugaru Strait is further shown to be weaker than that in the other two straits based on frictional balance around islands, that is, frictional stresses exerted around an island integrate to zero. In the Tsugaru Strait, the flows induced by the frictional integrals around the northern (Hokkaido) and southern (Honshu) islands are in opposite directions and tend to cancel out. Frictional balance also suggests that the annual cycle at the Tsugaru Strait is likely in phase with that at the Soya Strait because the length scale of the northern island is much shorter than that of the southern island.

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Section: A the Observed Annual Cyclementioning

confidence: 99%

Section: A the Observed Annual Cyclementioning

confidence: 99%

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confidence: 99%

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The Annual Cycle of the Japan Sea Throughflow

Kida

Qiu

Yang

et al. 2016

Journal of Physical Oceanography

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“…The warm TWC saline water passes through the Korea Strait where the flow often bifurcates into western and eastern branches. According to Teague et al (2002), the annual transport through the Korea/ Tsushima Strait is 2.7 Sv. The eastern branch of the TWC flows northeastward along the Japanese coast (Yoon 1982) with some of its waters exiting through the Tsugaru Strait and the rest spreading further north into the NE Japan Basin.…”

Section: Introductionmentioning

confidence: 99%

A Temporal Multiscale Analysis of the Waters off the East Coast of South Korea over the Past Four Decades

Jo¹,

Breaker²,

Tseng³

et al. 2014

Terr. Atmos. Ocean. Sci.

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We address the trends in water temperature variability to understand the local global warming effects through different time scales using daily sea surface temperature (SST) measurements from 1966 -2004. The abrupt SST changes off of the east coast of Korea are related to similar changes observed in the North Pacific. Seasonal water temperatures have increased by at least a factor of two or more in winter than in summer. While SSTs on annual timescales have increased significantly, SSTs on interannual timescales have decreased slightly at all stations. The anomalies in SST decadal time scales reveal maxima in temperature occurring in the mid-to-late 1970's, circa 1990 and circa 2000. These maxima coincide with major peaks in the North Pacific Gyre Oscillation (NPGO) with a lag of 4 -7 months. The most significant warming appears in the long-term SST trends at each station where it approaches +0.05°C yr -1 . Overall, the SST off the east coast of Korea has increased at rates that are far greater than what is reported in many other marginal seas.

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“…However, there have been few direct measurements of currents in the Ulleung Basin. The main focus of direct current measurements has been on the TWC in the KTS (Mizuno et al, 1989;Egawa et al, 1993;Isobe et al, 1994Isobe et al, , 2002Katoh et al, 1996;Teague et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Decadal Current Variations in the Southwestern Japan/East Sea

et al. 2004

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The public importing burden for This collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, inducing suggestions for reducing the burden, to the Department of Defense, Executive Services and Communications Directorate 10704-0188). Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ORGANIZATION.REPORT DATE (DD-MM-YYYY) SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Office of Naval Research 800 N. Quincy St. Arlington, VA 22217-5660 SPONSOR/MONITOR'S ACRONYM(S) ONR SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release, distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTAbsolute geostropbic velocities were calculated along TOPEX/Poseidon (T/P) groundtracks located in the Ulleung Basin of the southwestern Japan/East Sea (JES) from a combined analysis of nearly a decade of T/P data.and two years of pressure-gauge-equipped inverted echo sounder (PIES) data obtained during the United States Office of Naval Research's JES Program^ Geostrophic velocities have been calculated daily for the Ulleung Basin from June 1999 to July 2001 from a three-dimensional mapping of temperature and salinity produced by PIES data interpreted via ' the Gravest Empirical Mode (GEM) technique combined with the Navy's Modular Ocean Data Assimilation System (MODAS). These velocities were then used to convert T/P velocity anomalies to absolute velocities for the T/P time period of 1993 to 2002. Current intensities and variabilities associated with the East Korean Warm Current, Ulleung Warm Eddy, and Offshore Branch are examined. Spatial and temporal variations of the sea surface circulation are strong. Intensification of the currents generally occurred during the fall season. The flow pattern in individual years differed greatly from year to year and differed from climatology in important qualitative ways. SUBJECT TERMS

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Low-Frequency Current Observations in the Korea/Tsushima Strait*

Cited by 123 publications

References 26 publications

The Annual Cycle of the Japan Sea Throughflow

The Annual Cycle of the Japan Sea Throughflow

A Temporal Multiscale Analysis of the Waters off the East Coast of South Korea over the Past Four Decades

Decadal Current Variations in the Southwestern Japan/East Sea

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