Imperial College London
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DrDylanRood

Faculty of Engineering, Department of Earth Science & Engineering

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 7461d.rood

 
 
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Location

 

4.43Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Carlson:2021:10.1016/j.quascirev.2021.107101,
author = {Carlson, AE and Reyes, A and Sillett, K and Wilcken, KM and Rood, DH},
doi = {10.1016/j.quascirev.2021.107101},
journal = {Quaternary Science Reviews: the international multidisciplinary research and review journal},
pages = {1--10},
title = {Southwest Greenland ice-sheet retreat during the 8.2 ka cold event},
url = {http://dx.doi.org/10.1016/j.quascirev.2021.107101},
volume = {268},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The century-long 8.2 ka cold event interrupted early Holocene boreal warmth and may have halted retreat of Greenland ice-sheet margins during the last deglaciation. Here, we synthesize new and existing glacial geological data to assess the behavior of the southwest Greenland ice sheet during the 8.2 ka cold event. In southwest Greenland near the town of Kangerlussuaq, existing and new 10Be surface exposure ages demonstrate that deposition of the Keglen moraines ended at 8.0 ± 0.1 ka (n = 10, 1 outlier), with prior studies arguing that these moraines represented an ice-margin stillstand in response to the 8.2 ka cold event. However, new 10Be ages show that the southwest Greenland ice-sheet margin retreated from the Umîvît moraines, which lie 5–10 km outboard of the Keglen moraines, at 8.2 ± 0.2 ka (n = 11). Accordingly, we suggest that the southwest Greenland ice-sheet margin in the Kangerlussuaq region retreated 5–10 km during the 8.2 ka cold event. Farther south and inland from Nuuk, new 10Be boulder-on-bedrock ages adjacent to the modern ice-sheet margin demonstrate that the ice-margin was retreating with no moraine deposition at 8.2 ± 0.1 ka (n = 4, 1 outlier), with this retreat continuing up to at least ∼7.5 ka according to an existing threshold lake record. Therefore, we propose that the southwest Greenland ice-sheet margin underwent continued retreat during the 8.2 ka cold event in response to elevated early Holocene boreal summer insolation that overwhelmed the impacts from century-scale cooling. Caution should be used in assuming climatic causation for moraine deposition based on temporal correlation.
AU  - Carlson,AE
AU  - Reyes,A
AU  - Sillett,K
AU  - Wilcken,KM
AU  - Rood,DH
DO  - 10.1016/j.quascirev.2021.107101
EP  - 10
PY  - 2021///
SN  - 0277-3791
SP  - 1
TI  - Southwest Greenland ice-sheet retreat during the 8.2 ka cold event
T2  - Quaternary Science Reviews: the international multidisciplinary research and review journal
UR  - http://dx.doi.org/10.1016/j.quascirev.2021.107101
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000692518500003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://www.sciencedirect.com/science/article/pii/S0277379121003085?via%3Dihub
UR  - http://hdl.handle.net/10044/1/93500
VL  - 268
ER  -
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