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A Comparison of Methods for Identifying and Quantifying Ice Rafted Debris on the Antarctic Margin

Cited 2 time in wos
Cited 2 time in scopus
Title
A Comparison of Methods for Identifying and Quantifying Ice Rafted Debris on the Antarctic Margin
Other Titles
남극 대륙경계부에서 빙하운반역의 동정과 수량화의 방법 비교
Authors
Rob McKay
Olga Albot
Gavin Dunbar
이재일
이민경
유규철
김성한
Nikita Turton
Denise Kulhanek
Molly Patterson
Richard Levy
Keywords
남극 대륙경계부빙하운반역
Issue Date
2022
Citation
Rob McKay, et al. 2022. "A Comparison of Methods for Identifying and Quantifying Ice Rafted Debris on the Antarctic Margin". PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY, 37(4): 1-28.
Abstract
Quantification of ice rafted debris (IRD) abundances in deep-sea records is often used as a key proxy for identifying links between ice sheet instability and the oceanic overturning circulation. There currently exist multiple methods to determine IRD content in deep-sea sediment cores. The preference for a given method is often determined by the accessibility to core material and destructive nature of some methods. While many studies have discussed the caveats between linking IRD to ice sheet dynamics, the uncertainties relating to the methodological approaches are often not considered in the interpretation or comparisons between different IRD datasets, particularly in the Antarctic. To address this, we compare three independent methodologies of obtaining IRD abundances and also discuss how different approaches will affect determinations of mass accumulation rates (MARs). The three methodologies we examine include: counting clasts >2 mm in x-radiographs; the sieved weight percentage of the medium-to-coarse sand fraction (250 μm?2 mm); and volumetric estimates of the >125 μm sand fraction using laser diffraction particle size analysis. The x-radiograph and sieve methods produced comparable results, while the laser particle size analysis, although showing comparable long-term signals at most locations, in general has lower correlation to the other two methods and therefore a higher potential to obtain a noisy signal. We discuss the caveats associated with all methods, and emphasize that a combination of multiple methods should ideally be employed when assessing if a core is suitable for IRD study, and if sand or gravel fractions are accurately reflecting contents of IRD.
URI
https://repository.kopri.re.kr/handle/201206/13504
DOI
http://dx.doi.org/10.1029/2021PA004404
Type
Article
Station
Araon
Indexed
SCIE
Appears in Collections  
2022-2022, Ice sheet retreat and ocean circulation in West Antarctica during the past warm periods (22-22) / Yoo, Kyu-Cheul (PE22090)
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