Closing the Last Deglacial Global Sea Level Budget by Different Antarctic Deglaciation Models

Closing the Last Deglacial Global Sea Level Budget by Different Antarctic Deglaciation Models Abstract: The last deglacial history of the Antarctic Ice Sheet (AIS), the world’s largest freshwater reservoir, is important for monitoring the current AIS change and projecting the future sea-level rise t...

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Main Author: Yucheng, Lin
Format: Master Thesis
Language:English
Subjects:
Online Access:http://hdl.handle.net/1885/203198
https://doi.org/10.25911/5e983487e7b1b
https://openresearch-repository.anu.edu.au/bitstream/1885/203198/4/Lin%20Thesis%202019.pdf.jpg
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spelling ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/203198 2024-01-14T10:02:26+01:00 Closing the Last Deglacial Global Sea Level Budget by Different Antarctic Deglaciation Models Yucheng, Lin http://hdl.handle.net/1885/203198 https://doi.org/10.25911/5e983487e7b1b https://openresearch-repository.anu.edu.au/bitstream/1885/203198/4/Lin%20Thesis%202019.pdf.jpg en_AU eng b71497948 http://hdl.handle.net/1885/203198 doi:10.25911/5e983487e7b1b https://openresearch-repository.anu.edu.au/bitstream/1885/203198/4/Lin%20Thesis%202019.pdf.jpg Glacial Isostatic Adjustment Antarctic Ice History Last Glaical Maximum Missing Ice Problem Thesis (Masters) ftanucanberra https://doi.org/10.25911/5e983487e7b1b 2023-12-15T09:38:29Z Closing the Last Deglacial Global Sea Level Budget by Different Antarctic Deglaciation Models Abstract: The last deglacial history of the Antarctic Ice Sheet (AIS), the world’s largest freshwater reservoir, is important for monitoring the current AIS change and projecting the future sea-level rise trend. However, due to the lack of direct observational constraints on AIS last deglacial history, currently, most of the knowledge of AIS deglaciation is from glacial isostatic adjustment (GIA) modelling studies. Currently, the most widely used AIS GIA models are ICE-6G_C (Argus et al., 2014, Peltier et al., 2015), W12 (Whitehouse et al., 2012a) and IJ05_R2 (Ivins et al., 2013). Although after combining with their preferred Earth models, they all show good capability to predict reasonable predictions compared to the geodetic observations (e.g, Global Positioning System), the great differences between their adopted deglaciation models would cause large uncertainties in their estimations. Here we show a global sea-level budget consistent GIA modelling approach to compare them with two high-quality far-field sea-level datasets (H18; Hibbert et al., 2018, L14; Lambeck et al., 2014) constructed using different underlying philosophies to test their compatibilities with the far-field sea-level observations. Similar to a previous study of Lambeck et al. (2014), the global sea-level budget in this study is defined by the global ice volume history reconstructed from each observational datasets. From our calculation, a large ice mass loss between 20-15 ka BP predicted by W12 is most likely to be incorrect, since it shows large inconsistencies with both observational datasets, suggesting that during this late glacial period, AIS should have a stable or an advanced phase. And during ~15-11 ka BP, far-field sea-level records shows a preference with ICE-6G_C, which is the only model with a distinct contribution to meltwater pulse 1a and 1b, showing good consistency with the much more dynamic cryospheric environment revealed by the ... Master Thesis Antarc* Antarctic Ice Sheet Australian National University: ANU Digital Collections Antarctic The Antarctic Peltier ENVELOPE(-63.495,-63.495,-64.854,-64.854)
institution Open Polar
collection Australian National University: ANU Digital Collections
op_collection_id ftanucanberra
language English
topic Glacial Isostatic Adjustment
Antarctic Ice History
Last Glaical Maximum
Missing Ice Problem
spellingShingle Glacial Isostatic Adjustment
Antarctic Ice History
Last Glaical Maximum
Missing Ice Problem
Yucheng, Lin
Closing the Last Deglacial Global Sea Level Budget by Different Antarctic Deglaciation Models
topic_facet Glacial Isostatic Adjustment
Antarctic Ice History
Last Glaical Maximum
Missing Ice Problem
description Closing the Last Deglacial Global Sea Level Budget by Different Antarctic Deglaciation Models Abstract: The last deglacial history of the Antarctic Ice Sheet (AIS), the world’s largest freshwater reservoir, is important for monitoring the current AIS change and projecting the future sea-level rise trend. However, due to the lack of direct observational constraints on AIS last deglacial history, currently, most of the knowledge of AIS deglaciation is from glacial isostatic adjustment (GIA) modelling studies. Currently, the most widely used AIS GIA models are ICE-6G_C (Argus et al., 2014, Peltier et al., 2015), W12 (Whitehouse et al., 2012a) and IJ05_R2 (Ivins et al., 2013). Although after combining with their preferred Earth models, they all show good capability to predict reasonable predictions compared to the geodetic observations (e.g, Global Positioning System), the great differences between their adopted deglaciation models would cause large uncertainties in their estimations. Here we show a global sea-level budget consistent GIA modelling approach to compare them with two high-quality far-field sea-level datasets (H18; Hibbert et al., 2018, L14; Lambeck et al., 2014) constructed using different underlying philosophies to test their compatibilities with the far-field sea-level observations. Similar to a previous study of Lambeck et al. (2014), the global sea-level budget in this study is defined by the global ice volume history reconstructed from each observational datasets. From our calculation, a large ice mass loss between 20-15 ka BP predicted by W12 is most likely to be incorrect, since it shows large inconsistencies with both observational datasets, suggesting that during this late glacial period, AIS should have a stable or an advanced phase. And during ~15-11 ka BP, far-field sea-level records shows a preference with ICE-6G_C, which is the only model with a distinct contribution to meltwater pulse 1a and 1b, showing good consistency with the much more dynamic cryospheric environment revealed by the ...
format Master Thesis
author Yucheng, Lin
author_facet Yucheng, Lin
author_sort Yucheng, Lin
title Closing the Last Deglacial Global Sea Level Budget by Different Antarctic Deglaciation Models
title_short Closing the Last Deglacial Global Sea Level Budget by Different Antarctic Deglaciation Models
title_full Closing the Last Deglacial Global Sea Level Budget by Different Antarctic Deglaciation Models
title_fullStr Closing the Last Deglacial Global Sea Level Budget by Different Antarctic Deglaciation Models
title_full_unstemmed Closing the Last Deglacial Global Sea Level Budget by Different Antarctic Deglaciation Models
title_sort closing the last deglacial global sea level budget by different antarctic deglaciation models
url http://hdl.handle.net/1885/203198
https://doi.org/10.25911/5e983487e7b1b
https://openresearch-repository.anu.edu.au/bitstream/1885/203198/4/Lin%20Thesis%202019.pdf.jpg
long_lat ENVELOPE(-63.495,-63.495,-64.854,-64.854)
geographic Antarctic
The Antarctic
Peltier
geographic_facet Antarctic
The Antarctic
Peltier
genre Antarc*
Antarctic
Ice Sheet
genre_facet Antarc*
Antarctic
Ice Sheet
op_relation b71497948
http://hdl.handle.net/1885/203198
doi:10.25911/5e983487e7b1b
https://openresearch-repository.anu.edu.au/bitstream/1885/203198/4/Lin%20Thesis%202019.pdf.jpg
op_doi https://doi.org/10.25911/5e983487e7b1b
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