Southern ocean bottom water of the Australian‐New Zealand sector

Rodman, M.; Gordon, Arnold L.

doi:10.1029/jc087ic08p05771

Cited by 44 publications

(13 citation statements)

References 15 publications

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“…Picked species are identified in Table 2 and illustrated in Fig. 4; these were chosen as being representative of different paleo-watermasses, including surface, mode, and bottom waters (Table 2; (after wyrtki 1961Garner 1962Garner , 1967Garner & Ridgway 1965;Rodman & Gordon 1982;drewry 1983;Heath 1985. ) New Zealand Journal of Geology and Geophysics, 2008, Vol.…”

Section: Methodsmentioning

confidence: 99%

Miocene isotope zones, paleotemperatures, and carbon maxima events at intermediate water‐depth, Site 593, Southwest Pacific

Cooke

Nelson²,

Crundwell

2008

New Zealand Journal of Geology and Geophysics

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Section: Methodsmentioning

confidence: 99%

Miocene isotope zones, paleotemperatures, and carbon maxima events at intermediate water‐depth, Site 593, Southwest Pacific

Cooke

Nelson²,

Crundwell

2008

New Zealand Journal of Geology and Geophysics

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“…ALBW forms from the export of dense shelf waters produced beneath coastal polynyas [ Gordon and Tchernia , 1972; Rodman and Gordon , 1982; Rintoul , 1998; Fukamachi et al , 2000; Bindoff et al , 2000a, 2001; Williams and Bindoff , 2003; Morales Maqueda et al , 2004], in particular the Mertz Glacier polynya system located over the Adélie Depression (142–147°E, Figure 1b). Direct observations of the formation and export of dense shelf water from the Adélie Depression or other source regions of AABW around Antarctica are rare.…”

Section: Introductionmentioning

confidence: 99%

Formation and export of dense shelf water from the Adélie Depression, East Antarctica

et al. 2008

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Coastal polynyas in the Adélie Depression are an important source of Antarctic Bottom Water to the Australian‐Antarctic Basin. We present time series (April 1998 to May 1999 and August 1999 to February 2000) of data from temperature‐salinity sensors, in both the Adélie Depression and the known outflow region of the Adélie Sill, to describe the annual cycle of shelf water densities. From April through September, salinification beneath the polynya produces dense shelf waters. During September–October, shelf water densities in the depression peak at 27.94 kg m−3, and the cooling and freshening signature of Ice Shelf Water is observed north of Buchanan Bay. In November–December, shelf water densities decrease as intrusions of warm and relatively fresh modified Circumpolar Deep Water enter east of the Adélie Sill. From January–March the surface layer is conditioned by the cooling of the atmosphere, which overturns the upper water column. At the Adélie Sill, observed daily mean currents were approximately 10 cm s−1 with intense instantaneous currents greater than 50 cm s−1 at the sill depth. Using an idealized outflow region with a rectangular cross‐sectional area (6 × 106 m2), we present the first estimates of shelf water export by potential density class. Assuming shelf water with a minimum density of 27.88 kg m−3 has sufficient negative buoyancy for downslope mixing and a fourfold volume increase (1:3 mixing ratio) from entrainment, the dense shelf water export of 0.1–0.5 Sv results in an annual average production of bottom water in this region of between 0.4 and 2.0 Sv. The wide range in bottom water estimate results from data limitations, and a narrowing of this range requires further mooring observations.

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“…This latter is colder (-2.038C) and less salty (34.68) than HSSW. The northward branch of HSSW reaches the continental shelf break where it mixes with the Modified Circumpolar Deep Water (MCDW) forming deep and bottom waters (Jacobs et al 1970, Gordon & Tchernia 1972, Rodman & Gordon 1982, Budillon et al 1999.…”

Section: Ross Sea Hydrologymentioning

confidence: 99%

Anthropogenic carbon distribution in the Ross Sea, Antarctica

et al. 2007

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The Ross Sea is an area of dense water formation within the Southern Ocean, hence it potentially plays an important role for anthropogenic CO 2 sequestration : In order to estimate the penetration of anthropogenic carbon in the Ross Sea from total inorganic carbon (TCO 2 ) measurements carried out in 2002 -03 Antarctic Italian Expedition, we applied two independent models. Anthropogenic carbon was present throughout the water column. The highest concentrations were associated with the recently ventilated shelf waters, namely High Salinity Shelf Water (HSSW) and Ice Shelf Water (ISW), due to their recent contact with the atmosphere. The lowest concentrations were observed for Circumpolar Deep Water (CDW), due to its relatively older ventilation age. This water mass intrudes onto the shelf in some parts of the Ross Sea and hence is observed in the sampled section, where it is recognizable for its low O 2 and high TCO 2 concentrations. The overflow of the dense High Salinity Shelf Water out of the continental slope was observed in the area off Cape Adare. Since this recently formed shelf water contributes to the formation of the Antarctic Bottom Water (AABW), this process represents a pathway for anthropogenic carbon export down to the deep ocean.

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Southern ocean bottom water of the Australian‐New Zealand sector

Cited by 44 publications

References 15 publications

Miocene isotope zones, paleotemperatures, and carbon maxima events at intermediate water‐depth, Site 593, Southwest Pacific

Miocene isotope zones, paleotemperatures, and carbon maxima events at intermediate water‐depth, Site 593, Southwest Pacific

Formation and export of dense shelf water from the Adélie Depression, East Antarctica

Anthropogenic carbon distribution in the Ross Sea, Antarctica

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