Evidence for elevated and spatially variable geothermal flux beneath the West Antarctic Ice Sheet

Schroeder, Dustin M.; Blankenship, D. D.; Young, D. A.; Quartini, Enrica

doi:10.1073/pnas.1405184111

Cited by 112 publications

(135 citation statements)

References 32 publications

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“…High geothermal heat flux is in agreement with the seismic inferences of a thin elastic lithosphere and low mantle viscosity and would favor the presence of such a DL also in West Antarctica (Shapiro and Ritzwoller, 2004;Schroeder et al, 2014).…”

Section: Viscoelastic Modelingsupporting

confidence: 83%

Altimetry, gravimetry, GPS and viscoelastic modeling data for the joint inversion for glacial isostatic adjustment in Antarctica (ESA STSE Project REGINA)

Sasgen

Martín-Español

Horvath

et al. 2018

Earth Syst. Sci. Data

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Abstract. The poorly known correction for the ongoing deformation of the solid Earth caused by glacial isostatic adjustment (GIA) is a major uncertainty in determining the mass balance of the Antarctic ice sheet from measurements of satellite gravimetry and to a lesser extent satellite altimetry. In the past decade, much progress has been made in consistently modeling ice sheet and solid Earth interactions; however, forward-modeling solutions of GIA in Antarctica remain uncertain due to the sparsity of constraints on the ice sheet evolution, as well as the Earth's rheological properties. An alternative approach towards estimating GIA is the joint inversion of multiple satellite data -namely, satellite gravimetry, satellite altimetry and GPS, which reflect, with different sensitivities, trends in recent glacial changes and GIA. Crucial to the success of this approach is the accuracy of the spacegeodetic data sets. Here, we present reprocessed rates of surface-ice elevation change (Envisat/Ice,

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Section: Viscoelastic Modelingsupporting

confidence: 83%

Altimetry, gravimetry, GPS and viscoelastic modeling data for the joint inversion for glacial isostatic adjustment in Antarctica (ESA STSE Project REGINA)

Sasgen

Martín-Español

Horvath

et al. 2018

Earth Syst. Sci. Data

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“…Seismic imaging (Hansen et al 2014), as well as inferences from radar sounding and subglacial water routing (Schroeder et al 2014) point towards a very low viscosity in the upper mantle of this region. Therefore, the large uplift is likely caused by a rapid viscoelastic response to more recent ice retreat and thinning.…”

Section: Large Uplift In the Amundsen Sea Embaymentmentioning

confidence: 95%

Joint inversion estimate of regional glacial isostatic adjustment in Antarctica considering a lateral varying Earth structure (ESA STSE Project REGINA)

Sasgen¹,

Martín-Español

Horvath

et al. 2017

Geophysical Journal International

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“…Localized heating, such as in the case of volcanic subglacial systems in Iceland, can also generate lakes [11]. Subglacial volcanic systems have not yet been detected in West Antarctica, but their presence has been inferred based on aerogeophysical data and high geothermal flux measurements in the upper Bindschadler and Kamb Ice Streams [12] and upper Thwaites Glacier [13].…”

Section: Antarctic Subglacial Lakes: An Underexplored Microbial Habitatmentioning

confidence: 99%

Subglacial Lake Whillans microbial biogeochemistry: a synthesis of current knowledge

Mikucki

Lee

Ghosh

et al. 2016

Phil. Trans. R. Soc. A.

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Liquid water occurs below glaciers and ice sheets globally, enabling the existence of an array of aquatic microbial ecosystems. In Antarctica, large subglacial lakes are present beneath hundreds to thousands of metres of ice, and scientific interest in exploring these environments has escalated over the past decade. After years of planning, the first team of scientists and engineers cleanly accessed and retrieved pristine samples from a West Antarctic subglacial lake ecosystem in January 2013. This paper reviews the findings to date on Subglacial Lake Whillans and presents new supporting data on the carbon and energy metabolism of resident microbes. The analysis of water and sediments from the lake revealed a diverse microbial community composed of bacteria and archaea that are close relatives of species known to use reduced N, S or Fe and CH4 as energy sources. The water chemistry of Subglacial Lake Whillans was dominated by weathering products from silicate minerals with a minor influence from seawater. Contributions to water chemistry from microbial sulfide oxidation and carbonation reactions were supported by genomic data. Collectively, these results provide unequivocal evidence that subglacial environments in this region of West Antarctica host active microbial ecosystems that participate in subglacial biogeochemical cyclingauthorsversionPeer reviewe

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Evidence for elevated and spatially variable geothermal flux beneath the West Antarctic Ice Sheet

Cited by 112 publications

References 32 publications

Altimetry, gravimetry, GPS and viscoelastic modeling data for the joint inversion for glacial isostatic adjustment in Antarctica (ESA STSE Project REGINA)

Altimetry, gravimetry, GPS and viscoelastic modeling data for the joint inversion for glacial isostatic adjustment in Antarctica (ESA STSE Project REGINA)

Joint inversion estimate of regional glacial isostatic adjustment in Antarctica considering a lateral varying Earth structure (ESA STSE Project REGINA)

Subglacial Lake Whillans microbial biogeochemistry: a synthesis of current knowledge

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