Eolian deposition of trace elements onto Taylor Valley Antarctic glaciers

Fortner, Sarah K.; Lyons, W. Berry; Olesik, John W.

doi:10.1016/j.apgeochem.2011.06.013

Cited by 24 publications

(29 citation statements)

References 36 publications

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“…The tent and drilling direction was oriented perpendicular to the englacial conduit crevasse that was described in Badgeley et al (). Englacial brine was pumped to the surface through precleaned (3% H 2 O 2 and nanopure water flushed; Mikucki et al, ) polyurethane tubing and collected into appropriate precleaned containers (Teflon or polyethene for most constituents) following established protocols from the MCM‐LTER (Fortner et al, ). Trace element samples were filtered in a “clean tent” on the surface of the glacier, while samples for major elements, nutrients, and dissolved organic carbon (DOC) were filtered within 48 hr in the Crary Laboratory at McMurdo Station.…”

Section: Methodsmentioning

confidence: 99%

The Geochemistry of Englacial Brine From Taylor Glacier, Antarctica

et al. 2019

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Blood Falls is a hypersaline, iron‐rich discharge at the terminus of the Taylor Glacier in the McMurdo Dry Valleys, Antarctica. In November 2014, brine in a conduit within the glacier was penetrated and sampled using clean‐entry techniques and a thermoelectric melting probe called the IceMole. We analyzed the englacial brine sample for filterable iron (fFe), total Fe, major cations and anions, nutrients, organic carbon, and perchlorate. In addition, aliquots were analyzed for minor and trace elements and isotopes including δD and δ18O of water, δ34S and δ18O of sulfate, 234U, 238U, δ11B, 87Sr/86Sr, and δ81Br. These measurements were made in order to (1) determine the source and geochemical evolution of the brine and (2) compare the chemistry of the brine to that of nearby hypersaline lake waters and previous supraglacially sampled collections of Blood Falls outflow that were interpreted as end‐member brines. The englacial brine had higher Cl− concentrations than the Blood Falls end‐member outflow; however, other constituents were similar. The isotope data indicate that the water in the brine is derived from glacier melt. The H4SiO4 concentrations and U and Sr isotope suggest a high degree of chemical weathering products. The brine has a low N:P ratio of ~7.2 with most of the dissolved inorganic nitrogen in the form of NH4+. Dissolved organic carbon concentrations are similar to end‐member outflow values. Our results provide strong evidence that the original source of solutes in the brine was ancient seawater, which has been modified with the addition of chemical weathering products.

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Section: Methodsmentioning

confidence: 99%

The Geochemistry of Englacial Brine From Taylor Glacier, Antarctica

et al. 2019

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“…Ikegawa et al, 1999;Dahe et al, 1999;Grotti et al, 2011;Thamban and Thakur, 2013). In addition, the analysis of samples collected from snow pits (Boutron and Patterson, 1983;Planchon et al, 2002a,b;Hong et al, 2002;Hur et al, 2007;Fortner et al, 2011;Hong et al, 2012) provided important time-series or seasonal patterns of trace metal deposition to the snow.…”

Section: Introductionmentioning

confidence: 98%

Year-round record of dissolved and particulate metals in surface snow at Dome Concordia (East Antarctica)

et al. 2015

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“…Both streams overlay similar lithologies including bedrock of the following: Precambrian to Cambrian metasediments including marbles, schists and argillites and Jurassic Ferrar Dolerite (Hendy et al, 1979), overlain by Bonney lacustrine deposits and Quaternary Ross Sea drift and Alpine 1 glacial drift (Hall et al, 2000). Although sites overlay similar landscapes, previous work has shown that Andersen Creek and the western supraglacial streams feeding it have greater concentrations of crustally derived elements than Canada Stream (Fortner et al, 2011). Foehn winds deliver more debris to the western streams and glacier surfaces within the TV including Canada Glacier (Lyons et al, 2003;Fortner et al, 2005;Bagshaw et al, 2007).…”

Section: Site Descriptionmentioning

confidence: 93%

“…Although sites overlay similar landscapes, previous work has shown that Andersen Creek and the western supraglacial streams feeding it have greater concentrations of crustally derived elements than Canada Stream (Fortner et al ., ). Foehn winds deliver more debris to the western streams and glacier surfaces within the TV including Canada Glacier (Lyons et al ., ; Fortner et al ., ; Bagshaw et al ., ).…”

Section: Introductionmentioning

confidence: 97%

“…In this study, we examine the diel controls of a number of solutes in two TV streams that are derived from water from one glacier. Although these streams are derived from the same melt source, the western stream contains abundant eolian debris and very little visible biomass, and the eastern stream contains less eolian material and is one of the most biologically rich streams in the entire McMurdo Dry Valleys region (McKnight and Tate, ; Fortner et al ., ). The primary objective of this study was to examine the major distinctions between the concentrations of major and trace solutes in these two streams and to identify the processes responsible for their response to flow.…”

Section: Introductionmentioning

confidence: 99%

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Diel stream geochemistry, Taylor Valley, Antarctica

Fortner

Lyons

Munk

2012

Hydrological Processes

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Unlike temperate and polythermal proglacial streams, the proglacial streams in Taylor Valley (TV), Antarctica, are derived primarily from glacier surface melt with no subglacial or groundwater additions. Solute responses to flow reflect only the interaction of glacial meltwater with the valley floor surrounding the stream channel. We have investigated the major, minor and trace element 24‐h variations of two proglacial melt streams, Andersen Creek and Canada Stream, originating from the Canada Glacier in TV, Antarctica. Both streams exhibited diel mid‐austral summer diurnal flow variation, with maximum flow being more than 50 times the minimum flow. Dissolved (< 0.4 µm) major, minor and trace solute behaviors through diel periods were strongly controlled by the availability of readily solubilized material on the valley floor and hyporheic‐biological exchanges. Anderson Creek had generally greater solute concentrations than Canada Stream because of its greater receipt of eolian sediment. Andersen Creek also acquired greater solute concentrations in the rising limb of the hydrograph than the falling limb because of dissolution of eolian material at the surface of the stream channel coupled with minimal hyporheic‐biological exchange. Conversely, Canada Stream had less available eolian sediment, but a greater hyporheic‐biological exchange, which preferentially removed trace and major solutes in the rising limb and released them in the falling limb. Given the dynamic nature of discharge, eolian, and hyporheic‐biological processes, solute loads in TV streams are difficult to predict. Copyright © 2012 John Wiley & Sons, Ltd.

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Eolian deposition of trace elements onto Taylor Valley Antarctic glaciers

Cited by 24 publications

References 36 publications

The Geochemistry of Englacial Brine From Taylor Glacier, Antarctica

The Geochemistry of Englacial Brine From Taylor Glacier, Antarctica

Year-round record of dissolved and particulate metals in surface snow at Dome Concordia (East Antarctica)

Diel stream geochemistry, Taylor Valley, Antarctica

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