Scientific access into Mercer Subglacial Lake: Scientific objectives, drilling operations and initial observations

John C. Priscu, Jonas Kalin, John Winans, Timothy Campbell, Matthew R. Siegfried, Mark Skidmore, John E. Dore, Amy Leventer, David M. Harwood, Dennis Duling, Robert Zook, Justin Burnett, Dar Gibson, Edward Krula, Anatoly Mironov, Jim McManis, Graham Roberts, Brad E. Rosenheim, Brent C. Christner, Kathy KasicHelen A. Fricker, W. Berry Lyons, Joel Barker, Mark Bowling, Billy Collins, Christina Davis, Al Gagnon, Christopher Gardner, Chloe Gustafson, Ok Sun Kim, Wei Li, Alex Michaud, Molly O. Patterson, Martyn Tranter, Ryan Venturelli, Trista Vick-Majors, Cooper Elsworth

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The Subglacial Antarctic Lakes Scientific Access (SALSA) Project accessed Mercer Subglacial Lake using environmentally clean hot-water drilling to examine interactions among ice, water, sediment, rock, microbes and carbon reservoirs within the lake water column and underlying sediments. A ∼0.4 m diameter borehole was melted through 1087 m of ice and maintained over ∼10 days, allowing observation of ice properties and collection of water and sediment with various tools. Over this period, SALSA collected: 60 L of lake water and 10 L of deep borehole water; microbes >0.2 μm in diameter from in situ filtration of ∼100 L of lake water; 10 multicores 0.32-0.49 m long; 1.0 and 1.76 m long gravity cores; three conductivity-temperature-depth profiles of borehole and lake water; five discrete depth current meter measurements in the lake and images of ice, the lake water-ice interface and lake sediments. Temperature and conductivity data showed the hydrodynamic character of water mixing between the borehole and lake after entry. Models simulating melting of the ∼6 m thick basal accreted ice layer imply that debris fall-out through the ∼15 m water column to the lake sediments from borehole melting had little effect on the stratigraphy of surficial sediment cores.

Original languageEnglish (US)
JournalAnnals of Glaciology
DOIs
StatePublished - Jun 8 2021

Bibliographical note

Publisher Copyright:
Copyright © The Author(s), 2021. Published by Cambridge University Press.

Keywords

  • Antarctic glaciology
  • basal ice
  • biogeochemistry
  • glacial sedimentology
  • subglacial lakes

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