气候变化领域集成服务门户(CCPortal): Antarctic ice sheet palaeo-thinning rates from vertical transects of cosmogenic exposure ages

CCPortal

DOI	10.1016/j.quascirev.2018.12.024
	Antarctic ice sheet palaeo-thinning rates from vertical transects of cosmogenic exposure ages
	Small D.; Bentley M.J.; Jones R.S.; Pittard M.L.; Whitehouse P.L.
发表日期	2019
ISSN	0277-3791
起始页码	65
结束页码	80
卷号	206
英文摘要	Constraining Antarctic ice sheet evolution provides a way to validate numerical ice sheet models that aid predictions of sea-level rise. In this paper we collate cosmogenic exposure ages from exposed nunataks in Antarctica that have been used, or have the potential to be used, to constrain rates of thinning of the Antarctic Ice Sheets since the Last Glacial Maximum. We undertake quality control of the data and adopt a Bayesian approach to outlier detection. Past thinning rates are modelled by Monte Carlo linear regression analysis. We present thinning rates from 23 sites across Antarctica. The resulting data set is the first Antarctic-wide collation of past ice sheet thinning rates and provides an empirical starting point for future model-data comparisons. Palaeo-thinning rates are spatially variable with high rates appearing to correlate to areas of contemporary rapid changes. On centennial timescales past thinning rates are comparable to modern day observations implying that modern day thinning has the potential to persist for centuries in numerous parts of Antarctica. The onset of abrupt thinning from all sites post-dates Meltwater Pulse 1A suggesting that its source region(s) are distal to areas where exposure age constraints on ice surface geometry exist. © 2019 Elsevier Ltd
英文关键词	Antarctica; Cosmogenic isotopes; Glaciology; Holocene; Ice sheet thinning; Model-data comparison
语种	英语
scopus关键词	Bayesian networks; Glacial geology; Glaciers; Quality control; Regression analysis; Sea level; Antarctica; Cosmogenic isotopes; Glaciology; Holocenes; Ice sheet; Model-data comparisons; Ice; age; data set; glacial landform; glaciology; Holocene; ice sheet; Last Glacial Maximum; meltwater; nunatak; paleoenvironment; transect; Antarctic Ice Sheet; Antarctica
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/152025
作者单位	Department of Geography, Durham University, Durham, DH1 3LE, United Kingdom
推荐引用方式 GB/T 7714	Small D.,Bentley M.J.,Jones R.S.,et al. Antarctic ice sheet palaeo-thinning rates from vertical transects of cosmogenic exposure ages[J],2019,206.
APA	Small D.,Bentley M.J.,Jones R.S.,Pittard M.L.,&Whitehouse P.L..(2019).Antarctic ice sheet palaeo-thinning rates from vertical transects of cosmogenic exposure ages.Quaternary Science Reviews,206.
MLA	Small D.,et al."Antarctic ice sheet palaeo-thinning rates from vertical transects of cosmogenic exposure ages".Quaternary Science Reviews 206(2019).