Distribution and Circulation of Labrador Sea Water

Talley, Lynne D.; McCartney, Michael S.

doi:10.1175/1520-0485(1982)012<1189:dacols>2.0.co;2

Cited by 453 publications

(300 citation statements)

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“…In the absence of mixing, the potential vorticity will be conserved along flow line (Talley and McCartney, 1982). Since the potential vorticity is in proportion to reciprocal of a thickness between isopycnal surfaces and the Japan Sea is of a narrow range of latitude, the horizontal distribution of thickness must be equivalent to that of potential vorticity.…”

Section: Discussionmentioning

confidence: 99%

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: Discussionmentioning

confidence: 99%

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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“…The trajectories in the eastern basin are located in the broad tongue of minimum potential vorticity shown by Talley and McCartney (1982). Estimating the associated spreading rates for the 900-days duration and 2000-km length of the drift yields about 2-3 cm s Ϫ1 , of which a substantial part is due to surface drift.…”

Section: E Eastward Spreading Toward the Charlie Gibbs Fracture Zonementioning

confidence: 95%

“…Much less is known about the spreading of LSW within the subpolar North Atlantic and about the export out of the subpolar gyre. Spreading paths were deduced from either dynamic tracers such as potential vorticity (Talley and McCartney 1982), from distributions of passive tracers (Sy et al 1997), or more recently from a large fleet of profiling floats (Lavender et al 2000). A consistent result in these investigations was an eastward route across the Atlantic at the latitude of the Charlie Gibbs Fracture Zone into the eastern subpolar North Atlantic.…”

Section: Introductionmentioning

confidence: 99%

“…Spreading timescales of about 4 years were estimated from chloroflourocarbon (CFC) distributions (Sy et al 1997). The potential vorticity fields of Talley and McCartney (1982) show an additional path along the western boundary connecting the subpolar regime with the subtropics. It is this path that is thought to carry the anomalous CFC signal produced by the intense convection of the early 1990s southward to the Bahamas near 26.5ЊN (Molinari et al 1998).…”

Section: Introductionmentioning

confidence: 99%

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Labrador Sea Water Tracked by Profiling Floats—From the Boundary Current into the Open North Atlantic

Fischer¹,

Schott²

2002

J. Phys. Oceanogr.

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Fifteen profiling floats were injected into the deep boundary current off Labrador. They were ballasted to drift in the core depth of Labrador Sea Water (LSW) at 1500-m depth and were deployed in two groups during March and July/August 1997. Initially, for about three months, the floats were drifting within the boundary current, and the flow vectors were used to determine the mean horizontal structure of the Deep Labrador Current, which was found to be about 100 km wide with an average core speed of 18 cm s Ϫ1 . North of Flemish Cap the boundary current encounters complicated topography around ''Orphan Knoll,'' and there the LSW outflow splits up into different routes. One obvious LSW path is eastward through the Charlie Gibbs Fracture Zone and another route is a narrow recirculation toward the central Labrador Sea. A surprising result was that none of the floats were able to follow the boundary current southward to the Grand Banks area and exit into the subtropics. Trajectories and temperature profiles of the eastward drifting floats indicate the importance of the North Atlantic Current for dispersing the floats, even at the level of LSW.

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“…The subsurface PV minimum is a useful tracer for STMW and CMW because the deep convection that forms those mode waters is a source of low PV and water conserves PValong its advection path if source and dissipation are negligible [e.g., Tally and McCartney, 1982].…”

Section: Model and Experimentsmentioning

confidence: 99%

Decadal variability of the Subtropical Front of the western North Pacific in an eddy‐resolving ocean general circulation model

Yamanaka¹,

Ishizaki²,

Hirabara³

et al. 2008

J. Geophys. Res.

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[1] We examined decadal variability of the Subtropical Front (STF) of the western North Pacific by using a North Pacific ocean general circulation model (OGCM), comparing the results of three simulations with different horizontal resolutions. In the long-term mean fields, the eddy-resolving model (10 km) was able to simulate the distributions of the STF and the associated Subtropical Countercurrent (STCC) between 20°N and 30°N better than either the non-eddy-resolving model (100 km) or the eddy-permitting model (20 km) because it simulated the Kuroshio recirculation gyre more realistically. The simulated STF intensity exhibited significant decadal-scale variations: it was stronger in the late 1970s and weaker in the early 1990s. During these two periods, the simulated mode waters showed corresponding differences in their potential vorticity minima density and paths. We also investigated the relationship between the decadal-scale STF variability and atmospheric forcing. The results suggest that the decadal-scale STF variability can be largely explained by changes in the mode waters formed in the western North Pacific and advected to north of the STF by the subtropical gyre in response to a change in surface westerly winds that occurred in the mid-1970s.

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Distribution and Circulation of Labrador Sea Water

Cited by 453 publications

References 0 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

Labrador Sea Water Tracked by Profiling Floats—From the Boundary Current into the Open North Atlantic

Decadal variability of the Subtropical Front of the western North Pacific in an eddy‐resolving ocean general circulation model

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