In situ 10Be modeling and terrain analysis constrain subglacial quarrying and abrasion rates at Sermeq Kujalleq (Jakobshavn Isbræ), Greenland

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Abstract ∼ 10 Be analyses, a digital terrain model, and field observations. Cosmogenic 10 Be measurements along a 1.2 m tall quarried bedrock step reveal a triangular wedge of quarried rock. Using individual 10 Be measurements from abraded surfaces across the study area, we derive an average abrasion rate of 0.13 ± - 1 ∼ 2 study area, we estimate that the Greenland Ice Sheet quarried 378 ± 3 and abraded 322 ± 3 of material at this site. These values result in an average total erosion rate of 0.26 ± - 1 10 Be analysis and surface texture mapping indicate that many lee steps are relicts from the prior glaciation and were not re-quarried during the recent overriding event. These new observations of glacier erosion in a recently exposed landscape provide one of the first direct measurements of quarrying rates and indicate that quarrying accounts for roughly half of the total glacial erosion in representative continental shield lithologies.

Standort: Deutsche Nationalbibliothek Frankfurt am Main

Umfang: Online-Ressource

Sprache: Englisch

Erschienen in: In situ ¹⁰Be modeling and terrain analysis constrain subglacial quarrying and abrasion rates at Sermeq Kujalleq (Jakobshavn Isbræ), Greenland ; volume:17 ; number:11 ; year:2023 ; pages:4535-4547 ; extent:13
The Cryosphere ; 17, Heft 11 (2023), 4535-4547 (gesamt 13)

Urheber: Graham, Brandon L.
Briner, Jason P.
Young, Nicolás E.
Balter-Kennedy, Allie
Koppes, Michele
Schaefer, Joerg M.
Poinar, Kristin
Thomas, Elizabeth K.

DOI: 10.5194/tc-17-4535-2023

URN: urn:nbn:de:101:1-2023110203151084664284

Rechteinformation: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.

Letzte Aktualisierung: 14.08.2025, 10:47 MESZ

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Beteiligte

Graham, Brandon L.
Briner, Jason P.
Young, Nicolás E.
Balter-Kennedy, Allie
Koppes, Michele
Schaefer, Joerg M.
Poinar, Kristin
Thomas, Elizabeth K.

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In situ <sup>10</sup>Be modeling and terrain analysis constrain subglacial quarrying and abrasion rates at Sermeq Kujalleq (Jakobshavn Isbræ), Greenland

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In situ <sup>10</sup>Be modeling and terrain analysis constrain subglacial quarrying and abrasion rates at Sermeq Kujalleq (Jakobshavn Isbræ), Greenland

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