Dating of geochemical events in Lake Bonney, Antarctica, and their relation to glacial and climate changes

Hendy, Chris H.; Wilson, A. T.; Popplewell, K. B.; House, D. A.

doi:10.1080/00288306.1977.10420698

Cited by 85 publications

(63 citation statements)

References 20 publications

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“…One or more of these processes may account for the distribution of dissolved solutes in icecovered coastal ponds (Matsubaya et al 1979;Bird et al 199 1) and in several dry valley lakes in the McMurdo Sound region of southern Victoria Land. Distinguishing between these processes is critical to understanding regional paleoclimate because the evaporative concentration hypothesis has been used to estimate the timing of desiccation in several McMurdo Dry Valley lakes (Wilson 1964;Hendy et al 1977;Lawrence 1982;Lawrence and Hendy 1985; W. B. Lyons pers. comm.)…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…Attempts to explain the origin of saline bottom water in closed-basin, antarctic lakes have focused on relict seawater (Hendy et al 1977;Masuda et al 1988) evaporative concentration of a pre-existing water body (Lawrence and Hendy 1985;Torii et al 1989), and input of high-salinity groundwaters or modified surface waters (Green and Canfield 1984;Green et al 1989). One or more of these processes may account for the distribution of dissolved solutes in icecovered coastal ponds (Matsubaya et al 1979;Bird et al 199 1) and in several dry valley lakes in the McMurdo Sound region of southern Victoria Land.…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…Lawrence andHendy 1985, 1989;Green et al 1988). Vertical profiles of dissolved solutes in ice-covered lakes have been previously applied in estimating the lifetime of restricted mixing with one-dimensional diffusion models and interpreted as basin refilling ages (Wilson 1964;Hendy et al 1977;Lawrence 1982;Lawrence and Hendy 1985;W. B. Lyons pers.…”

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confidence: 99%

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Effects of glacial meltwater inflows and moat freezing on mixing in an ice‐covered antarctic lake as interpreted from stable isotope and tritium distributions

Miller

Aiken

1996

Limnology & Oceanography

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Perennially ice-covered lakes in the McMurdo Dry Valleys have risen several meters over the past two decades due to climatic warming and increased glacial meltwater inflow. To elucidate the hydrologic responses to changing climate and the effects on lake mixing processes we measured the stable isotope (al80 and 6D) and tritium concentrations of water and ice samples collected in the Lake Fryxell watershed from 1987 through 1990. Stable isotope enrichment resulted from evaporation in stream and moat samples and from sublimation in surface lake-ice samples. Tritium enrichment resulted from exchange with the postnuclear atmosphere in stream and moat samples. Rapid injection of tritiated water into the upper water column of the lake and incorporation of this water into the ice cover resulted in uniformly elevated tritium contents (> 3.0 TU) in these reservoirs. Tritium was also present in deep water, suggesting that a component of bottom water was recently at the surface. During summer, melted lake ice and stream water forms the moat. Water excluded from ice formation during fall moat freezing (enriched in solutes and tritium, and depleted in IsO and 2H relative to water below 15-m depth) may sink as density currents-to the bottom of the lake. Seasonal lake circulation, in response to climate-driven surface inflow, is therefore responsible for the distribution of both water isotopes and dissolved solutes in Lake Fryxell.

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Section: Acknowledgmentsmentioning

confidence: 99%

Section: Acknowledgmentsmentioning

confidence: 99%

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Effects of glacial meltwater inflows and moat freezing on mixing in an ice‐covered antarctic lake as interpreted from stable isotope and tritium distributions

Miller

Aiken

1996

Limnology & Oceanography

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“…Accumulated salts are postulated to have been ablated (Lyons et al 1992). In contrast, Lake Fryxell did not completely dry out, but remained a saline pond (Hendy et al 1977;Lawrence and Hendy 1985;Lyons et al 1992). Green et al (1988) suggested that the chloride age of Lake Hoare is younger (2,200 years) than Lake Fryxell (3,000 years).…”

Section: Mechanisms For Convectionmentioning

confidence: 99%

“…Armed with this hypothesis, the solute profiles from Lakes Vanda (in Wright Valley) and Fryxell (in Taylor Valley) have been used by Hendy et al (1977). the atmosphere).…”

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confidence: 99%

Evidence of deep circulation in two perennially ice‐covered Antarctic lakes

Tyler

Cook

Butt

et al. 1998

Limnology & Oceanography

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The perennial ice covers found on many of the lakes in the McMurdo Dry Valley region of the Antarctic have been postulated to severely limit mixing and convective turnover of these unique lakes. In this work, we utilize chlorofluorocarbon (CFC) concentration profiles from Lakes Hoare and Fryxell in the McMurdo Dry Valley to determine the extent of deep vertical mixing occurring over the last 50 years. Near the ice-water interface, CFC concentrations in both lakes were well above saturation, in accordance with atmospheric gas supersaturations resulting from freezing under the perennial ice covers. Evidence of mixing throughout the water column at Lake Hoare was confirmed by the presence of CFCs throughout the water column and suggests vertical mixing times of 20-30 years. In Lake Fryxell, CFC-11, CFC-12, and CFC-113 were found in the upper water column; however, degradation of CFC-11 and CFC-12 in the anoxic bottom waters appears to be occurring with CFC-113 only present in these bottom waters. The presence of CFC-113 in the bottom waters, in conjunction with previous work detecting tritium in these waters, strongly argues for the presence of convective mixing in Lake Fryxell. The evidence for deep mixing in these lakes may be an important, yet overlooked, phenomenon in the limnology of perennially icecovered lakes.

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A Thermal, Isotopic, and Chemical Study of Lake Vanda and Don Juan Pond, Antartica

Friedman

Rafter

Smith

2013

Antarctic Research Series

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Dating of geochemical events in Lake Bonney, Antarctica, and their relation to glacial and climate changes

Abstract: Measurements of major ion concentrations, 1) 18 0 , and 14C

Cited by 85 publications

References 20 publications

Effects of glacial meltwater inflows and moat freezing on mixing in an ice‐covered antarctic lake as interpreted from stable isotope and tritium distributions

Effects of glacial meltwater inflows and moat freezing on mixing in an ice‐covered antarctic lake as interpreted from stable isotope and tritium distributions

Evidence of deep circulation in two perennially ice‐covered Antarctic lakes

A Thermal, Isotopic, and Chemical Study of Lake Vanda and Don Juan Pond, Antartica

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