Ground ice recharge via brine transport in frozen soils of Victoria Valley, Antarctica: Insights from modeling δ18O and δD profiles

Hagedorn, Birgit; Sletten, R. S.; Hallet, Bernard; McTigue, D. F.; Steig, Eric J.

doi:10.1016/j.gca.2009.10.021

Cited by 38 publications

(57 citation statements)

References 74 publications

(111 reference statements)

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“…Stable isotope (δ 18 O and δ 2 H) values of both the ice and sediment pore water fell on or below the local meteoric water line but on a slope consistent with the sublimation of ice (Sokratov and Golubev, 2009;Hagedorn et al, 2010;Lacelle et al, 2011Lacelle et al, , 2013 and isotopic values reported around the dry valleys (Gooseff et al, 2006;Harris et al, 2007) (Fig. 6).…”

Section: Resultssupporting

confidence: 54%

Stratigraphy of Lake Vida, Antarctica: hydrologic implications of 27 m of ice

et al. 2015

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Abstract. Lake Vida, located in Victoria Valley, is one of the largest lakes in the McMurdo dry valleys and is known to contain hypersaline liquid brine sealed below 16 m of freshwater ice. For the first time, Lake Vida was drilled to a depth of 27 m. Below 21 m the ice is marked by well-sorted sand layers up to 20 cm thick within a matrix of salty ice. From ice chemistry, isotopic composition of δ 18 O and δ 2 H, and ground penetrating radar profiles, we conclude that the entire 27 m of ice formed from surface runoff and the sediment layers represent the accumulation of surface deposits. Radiocarbon and optically stimulated luminescence dating limit the maximum age of the lower ice to 6300 14 C yr BP. As the ice cover ablated downwards during periods of low surface inflow, progressive accumulation of sediment layers insulated and preserved the ice and brine beneath, analogous to the processes that preserve shallow ground ice. The repetition of these sediment layers reveals hydrologic variability in Victoria Valley during the mid-to late Holocene. Lake Vida is an exemplar site for understanding the preservation of subsurface brine, ice, and sediment in a cold desert environment.

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Section: Resultssupporting

confidence: 54%

Stratigraphy of Lake Vida, Antarctica: hydrologic implications of 27 m of ice

et al. 2015

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“…In Taylor Valley, soils highly saturated with exchangeable Na + likely form when Na‐Cl‐rich salts from marine aerosols leach down soil profiles following snowfall events [ Hagedorn et al ., ]. Because K + ions are relatively minor in Dry Valley soils [ Keys , ], downward‐leaching Na + will primarily displace exchangeable C a 2+ and M g 2+ :

2 {NaCl + (Ca, Mg) X}_{2} = {(Ca, Mg) Cl}_{2} + 2 NaX

…”

Section: Discussionmentioning

confidence: 99%

Soluble salt accumulations in Taylor Valley, Antarctica: Implications for paleolakes and Ross Sea Ice Sheet dynamics

2013

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. Na-HCO 3-rich compositions in eastern Taylor Valley are formed through leaching, calcite dissolution, and cation exchange reactions and appear to influence the chemistry of nearby streams and lakes. The data presented here support hypotheses that a lobe of the RSIS expanded into eastern Taylor Valley and dammed proglacial paleolakes. However, in contrast to previous studies, our findings indicate that the RSIS advanced deeper into Taylor Valley and that paleolakes were less extensive. By comparing soluble salt distributions across Taylor Valley, we conclude that a lobe of the RSIS filled all of eastern Taylor Valley and dammed paleolakes in western Taylor Valley up to approximately 300 m elevation. Following ice retreat, smaller paleolakes formed in both western and eastern Taylor Valley up to about 120 m elevation, with prominent still-stands controlled by the elevation of major valley thresholds. At higher elevations, soluble salt accumulations are consistent with older soils that have not been affected by the most recent RSIS advance.

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“…The potential for ancient buried glacier ice in the Dry Valleys has been debated for years (e.g., see Sugden et al, 1995;Hindmarsh et al, 1998;McKay et al, 1998;Schaefer et al, 2000;Stone et al, 2000;Marchant et al, 2002;Sletten et al, 2003;Ng et al, 2005;Hagedorn et al, 2007Hagedorn et al, , 2010McKay, 2009;Schorghofer, 2009;Morgan et al, 2010). Recent findings from the planetary-science community, which suggest that far older ice survives beneath thin debris on Mars, have Rates of annual sublimation asymptote to zero with increasing till thickness; the plot also emphasizes that, for sections of Mullins till b25 cm thick, sublimation rates are considerably higher during summer months (December, January February: DJF) than at other times of the year.…”

Section: Implications For Long-term Preservation Of Glacier Icementioning

confidence: 99%

“…An increase in cloud cover would likely result in cooler ground surface temperatures and, if associated with increased precipitation as one might expect, higher values for atmospheric RH. In addition, the documented potential for infiltration of shallow snowmelt would be an additional factor retarding net ice loss (e.g., Kowalewski et al, 2006;Hagedorn et al, 2007Hagedorn et al, , 2010McKay, 2009;Schorghofer, 2009). Finally, using a two dimensional model for vapor diffusion that included the effects of rocky surface pavements and salt-cemented horizons, Kowalewski and Marchant (in review) showed that sublimation losses for buried ice associated with Taylor Glacier in central Beacon Valley (e.g., beneath granite drift; Fig.…”

Section: The Change In Summertime Rh Required To Achieve Zero Ice Lossmentioning

confidence: 99%

Modeling vapor diffusion within cold and dry supraglacial tills of Antarctica: Implications for the preservation of ancient ice

et al. 2011

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Ground ice recharge via brine transport in frozen soils of Victoria Valley, Antarctica: Insights from modeling δ18O and δD profiles

Cited by 38 publications

References 74 publications

Stratigraphy of Lake Vida, Antarctica: hydrologic implications of 27 m of ice

Stratigraphy of Lake Vida, Antarctica: hydrologic implications of 27 m of ice

Soluble salt accumulations in Taylor Valley, Antarctica: Implications for paleolakes and Ross Sea Ice Sheet dynamics

Modeling vapor diffusion within cold and dry supraglacial tills of Antarctica: Implications for the preservation of ancient ice

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