A method for successful collection of multicores and gravity cores from Antarctic subglacial lakes

Abstract During the 2018–2019 Antarctic field season, the Subglacial Antarctic Lakes Scientific Access project team cleanly accessed Mercer Subglacial Lake, West Antarctica, to sample water and sediments beneath 1087 m of overlying ice. A multicorer was successful in sampling the sediment–water inte...

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Bibliographic Details
Published in:Limnology and Oceanography: Methods
Main Authors: Rosenheim, Brad E., Michaud, Alexander B., Broda, James, Gagnon, Alan, Venturelli, Ryan A., Campbell, Timothy D., Leventer, Amy, Patterson, Molly, Siegfried, Matthew R., Christner, Brent C., Duling, Dennis, Harwood, David, Dore, John E., Tranter, Martyn, Skidmore, Mark L., Priscu, John C.
Other Authors: National Science Foundation
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2023
Subjects:
Antarctic
Mercer
West Antarctica
Antarc*
Antarctica
Online Access:http://dx.doi.org/10.1002/lom3.10545
https://aslopubs.onlinelibrary.wiley.com/doi/am-pdf/10.1002/lom3.10545
https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lom3.10545
Description
Summary:Abstract During the 2018–2019 Antarctic field season, the Subglacial Antarctic Lakes Scientific Access project team cleanly accessed Mercer Subglacial Lake, West Antarctica, to sample water and sediments beneath 1087 m of overlying ice. A multicorer was successful in sampling the sediment–water interface, with 4 deployments retrieving 10 cores between 0.3 and 0.4 m in length. Gravity coring was also successful, retrieving cores of 0.97 and 1.78 m in glacial diamict. However, sediment cores retrieved by the gravity cores were shorter than the core barrel penetration (as measured by mud streaks on the outside of the coring system), indicating that the system can likely be improved. This manuscript describes the design, implementation, successes, and lessons learned while coring sediments in a subglacial lake.

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