Neon distribution in South Atlantic and South Pacific waters

Well, Roland; Roether, Wolfgang

doi:10.1016/s0967-0637(03)00058-x

Cited by 29 publications

(25 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is still debatable whether a reduction of the saturation due to sea-ice formation has an impact on the neon concentration in freshly ventilated water masses of the deep ocean. Hood (1997) suggests that sea ice formation erodes the neon supersaturation originating from ocean/ice shelf interaction, though Well and Roether (2003) argue that such strong neon reduction is not consistent with tracer observations in the Southern Ocean. Therefore, we further have to speculate about the processes which cause the observed slight supersaturation of neon in the abyssal ocean.…”

Section: Discussionmentioning

confidence: 88%

“…The isotope laboratory at the University of Bremen (Institute for Environmental Physics) measures neon data with a precision (internal consistency) of 0.1%-0.3% (Well, 1995;Well and Roether, 2003). For a currently supposed detectable supersaturation of 0.5-1%, ISW can be only found in the bottom layer on the continental shelf in front and next to the major caverns (Fig.…”

Section: Spreading Of Iswmentioning

confidence: 99%

See 1 more Smart Citation

Ocean/ice shelf interaction in the southern Weddell Sea: results of a regional numerical helium/neon simulation

et al. 2006

View full text Add to dashboard Cite

Ocean/ice interaction at the base of deep drafted Antarctic ice shelves modifies the physical properties of inflowing shelf waters to become Ice Shelf Water (ISW). In contrast to the conditions at the atmosphere/ocean interface, the increased hydrostatic pressure at the glacial base causes gases embedded in the ice to dissolve completely after being released by melting. Helium and neon with an extremely low solubility are supersaturated in glacial meltwater by more than 1000%. At the continental slope in front of the large Antarctic caverns ISW mixes with ambient waters to form different precursors of Antarctic Bottom Water. A regional ocean circulation model is presented which uses an explicit formulation of the ocean/ice shelf interaction to describe for the first time the input of noble gases to the Southern Ocean. The results reveal a long-term variability of the basal mass loss solely controlled by the interaction between waters of the continental shelf and the ice shelf cavern. Modeled helium and neon supersaturations from the Filchner-Ronne Ice Shelf front show a "low-pass" filtering of the inflowing signal due to cavern processes. On circumpolar scales the simulated helium and neon distributions allows us to quantify the ISW contribution to bottom water which spreads with the coastal current connecting the major formation sites in Ross and Weddell Seas.

show abstract

Section: Discussionmentioning

confidence: 88%

Section: Spreading Of Iswmentioning

confidence: 99%

Ocean/ice shelf interaction in the southern Weddell Sea: results of a regional numerical helium/neon simulation

et al. 2006

View full text Add to dashboard Cite

show abstract

“…1). Core MD07-3128 is located underneath the southward flowing Cape Horn Current (CHC), a northern branch of the ACC that continues toward the DP and provides a major fraction of the present day northern DP transport (17). Satellite-tracked surface drifters reveal that, after crossing the East Pacific Rise, sub-Antarctic Surface Water of the ACC is transported northeastward across the Southeast Pacific toward the Chilean coast at ∼45°S/75°W (18) ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Glacial reduction and millennial-scale variations in Drake Passage throughflow

Lamy

Arz

Kilian

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

116

111

View full text Add to dashboard Cite

The Drake Passage (DP) is the major geographic constriction for the Antarctic Circumpolar Current (ACC) and exerts a strong control on the exchange of physical, chemical, and biological properties between the Atlantic, Pacific, and Indian Ocean basins. Resolving changes in the flow of circumpolar water masses through this gateway is, therefore, crucial for advancing our understanding of the Southern Ocean’s role in global ocean and climate variability. Here, we reconstruct changes in DP throughflow dynamics over the past 65,000 y based on grain size and geochemical properties of sediment records from the southernmost continental margin of South America. Combined with published sediment records from the Scotia Sea, we argue for a considerable total reduction of DP transport and reveal an up to ∼40% decrease in flow speed along the northernmost ACC pathway entering the DP during glacial times. Superimposed on this long-term decrease are high-amplitude, millennial-scale variations, which parallel Southern Ocean and Antarctic temperature patterns. The glacial intervals of strong weakening of the ACC entering the DP imply an enhanced export of northern ACC surface and intermediate waters into the South Pacific Gyre and reduced Pacific–Atlantic exchange through the DP (“cold water route”). We conclude that changes in DP throughflow play a critical role for the global meridional overturning circulation and interbasin exchange in the Southern Ocean, most likely regulated by variations in the westerly wind field and changes in Antarctic sea ice extent.

show abstract

“…Although the concentration of a gas like argon varies by fifty percent from warm subtropical waters to the cold deep ocean, the range in Ar saturation (the difference between observed Ar concentrations and predicted equilibrium concentrations) is usually less than a few percent (Spitzer and Jenkins, 1989;Emerson et al, 1995;Hamme and Emerson, 2002). Neon and nitrogen are also generally within a few percent of equilibrium (Well and Roether, 2003). These deviations from equilibrium are forced by diffusive and bubble-mediated air-sea gas exchange, rapid temperature change, and atmospheric pressure (Craig and Weiss, 1971;Schudlich and Emerson, 1996;Hamme and Emerson, 2002), with ice processes dominant in some areas (Hood et al, 1998;Hohmann et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

The solubility of neon, nitrogen and argon in distilled water and seawater

Hamme

Emerson

2004

Deep Sea Research Part I: Oceanographic Research Papers

126

210

View full text Add to dashboard Cite

The solubility of neon, nitrogen and argon in distilled water and seawater AbstractLarge discrepancies in published neon and nitrogen solubility data limit the interpretation of oceanic measurements of these gases. We present new solubility measurements for neon, nitrogen and argon in distilled water and seawater, over a temperature range of 1-30 o C. Water was equilibrated with air at measured temperatures, salinities and pressures. Dissolved Ne concentrations were then determined by isotope dilution using a quadrupole mass spectrometer. Ratios of O 2 /N 2 /Ar were measured on a stable isotope ratio mass spectrometer, from which absolute N 2 and Ar concentrations were calculated using published O 2 solubilities. We propose new equations, fitted to the data, for the equilibrium concentrations of Ne, N 2 and Ar with estimated errors of 0.30%, 0.14% and 0.13%, respectively. The Ar results matched those of most previous researchers within 0.4%. However, the Ne and N 2 results were greater than those of Weiss (1971bWeiss ( , 1970 by 1% or more.

show abstract

Neon distribution in South Atlantic and South Pacific waters

Cited by 29 publications

References 32 publications

Ocean/ice shelf interaction in the southern Weddell Sea: results of a regional numerical helium/neon simulation

Ocean/ice shelf interaction in the southern Weddell Sea: results of a regional numerical helium/neon simulation

Glacial reduction and millennial-scale variations in Drake Passage throughflow

The solubility of neon, nitrogen and argon in distilled water and seawater

Contact Info

Product

Resources

About