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

@unpublished{Adams:2022:10.5194/tc-2022-82,
author = {Adams, JR and Johnson, JS and Roberts, SJ and Mason, PJ and Nichols, KA and Venturelli, RA and Wilcken, K and Balco, G and Goehring, B and Hall, B and Woodward, J and Rood, DH},
doi = {10.5194/tc-2022-82},
publisher = {Copernicus GmbH},
title = {New 10Be exposure ages improve Holocene ice sheet thinning historynear the grounding line of Pope Glacier, Antarctica},
url = {http://dx.doi.org/10.5194/tc-2022-82},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - UNPB
AB  - Evidence for the timing and pace of past grounding line retreat of the Thwaites Glacier system in the Amundsen Sea embayment (ASE) of Antarctica provides constraints for models that are used to predict the future trajectory of the West Antarctic Ice Sheet (WAIS). Existing cosmogenic nuclide surface exposure ages suggest that Pope Glacier, a former tributary of Thwaites Glacier, experienced rapid thinning in the early to mid-Holocene. There are relatively few exposure ages from the lower ice-free sections of Mount Murphy (< 300 m asl) that are uncomplicated by either nuclide inheritance or scattering due to localised topographic complexities; this makes the trajectory for the latter stages of deglaciation uncertain. This paper presents 12 new 10Be exposure ages from erratic cobbles collected from the western flank of Mt Murphy, within 160 m of the modern ice surface and 1 km from the present grounding line. The ages comprise two tightly clustered populations with mean deglaciation ages of 7.1 ± 0.1 ka and 6.4 ± 0.1 ka (1SE). Linear regression analysis applied to the age-elevation array of all available exposure ages from Mt Murphy indicates that the median rate of thinning of Pope Glacier was 0.27 m yr-1 between 8.1–6.3 ka, occurring 1.5 times faster than previously thought. Furthermore, this analysis better constrains the uncertainty (95 % confidence interval) in the timing of deglaciation at the base of the Mt Murphy vertical profile (~80 m above the modern ice surface), shifting it to earlier in the Holocene (from 5.2 ± 0.7 ka to 6.3 ± 0.4 ka). Taken together, the results presented here suggest that early–mid Holocene thinning of Pope Glacier occurred over a shorter interval than previously assumed and permit a longer duration over which subsequent late Holocene rethickening could have occurred.
AU  - Adams,JR
AU  - Johnson,JS
AU  - Roberts,SJ
AU  - Mason,PJ
AU  - Nichols,KA
AU  - Venturelli,RA
AU  - Wilcken,K
AU  - Balco,G
AU  - Goehring,B
AU  - Hall,B
AU  - Woodward,J
AU  - Rood,DH
DO  - 10.5194/tc-2022-82
PB  - Copernicus GmbH
PY  - 2022///
TI  - New 10Be exposure ages improve Holocene ice sheet thinning historynear the grounding line of Pope Glacier, Antarctica
UR  - http://dx.doi.org/10.5194/tc-2022-82
UR  - http://doi.org/10.5194/tc-2022-82-supplement
UR  - https://tc.copernicus.org/preprints/tc-2022-82/tc-2022-82.pdf
UR  - http://hdl.handle.net/10044/1/101621
ER  -
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