气候变化领域集成服务门户(CCPortal): Testing glacial isostatic adjustment models of last-interglacial sea level history in the Bahamas and Bermuda

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DOI	10.1016/j.quascirev.2020.106212
	Testing glacial isostatic adjustment models of last-interglacial sea level history in the Bahamas and Bermuda
	Muhs D.R.; Simmons K.R.; Schumann R.R.; Schweig E.S.; Rowe M.P.
发表日期	2020
ISSN	0277-3791
卷号	233
英文摘要	Part of the spatial variation in the apparent sea-level record of the last interglacial (LIG) period is due to the diverse response of coastlines to glacial isostatic adjustment (GIA) processes, particularly where coastlines were close to the Laurentide Ice Sheet during the past two glacial periods. We tested modeled LIG paleo-sea levels on New Providence Island (NPI), Bahamas and Bermuda by investigating emergent coral patch reefs and oolitic/peloidal beach deposits. Corals with closed-system histories collected from patch reefs on NPI have ages of 128-118 ka and ooids/peloids from beach ridges have closed-system ages of 128-116 ka. Elevations of patch reefs indicate a LIG paleo-sea level of at least ∼7 m to ∼9 m above present. Beach ridge sediments indicate paleo-sea levels of ∼5 m to ∼14 m (assuming subsidence, ∼7 m to ∼16 m) above present during the LIG. Some, though not all of these measurements are in good agreement with GIA models of paleo-sea level that have been simulated for the Bahamas. On Bermuda, corals with closed-system histories collected from marine deposits have ages of 126-114 ka. Although coral-bearing marine deposits on Bermuda lack the precise indication of paleo-sea level provided by patch reefs and oolitic beach ridges, these sediments nevertheless provide at least a first-order estimate of paleo-sea level. Paleo-sea level records on Bermuda are consistently lower (∼2 m to ∼7 m) than what GIA models simulate for the LIG. The reason for the reasonable agreement with models for the Bahamas and poor agreement for Bermuda is not understood, but needs further investigation in light of the probability of a higher sea level in the near future. © 2020
英文关键词	Coastal; Geomorphology; North atlantic; Pleistocene; Sea level changes; U–Th series
语种	英语
scopus关键词	Beaches; Deposits; Geomorphology; Glacial geology; Reefs; Coastal; Glacial isostatic adjustment; Glacial isostatic adjustment models; Laurentide ice sheets; North Atlantic; Pleistocene; Sealevel change; Spatial variations; Sea level; geomorphology; glacioisostasy; Last Interglacial; Laurentide Ice Sheet; Pleistocene; probability; sea level change; spatial variation; thorium isotope; uranium isotope; Atlantic Ocean; Atlantic Ocean (North); Bahamas; Bermuda; New Providence; Anthozoa
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/151548
作者单位	U.S. Geological Survey, Federal Center, MS 980, Box 25046, Denver, CO 80225, United States; 5 Shinbone Alley, St Georges GE05, Bermuda
推荐引用方式 GB/T 7714	Muhs D.R.,Simmons K.R.,Schumann R.R.,et al. Testing glacial isostatic adjustment models of last-interglacial sea level history in the Bahamas and Bermuda[J],2020,233.
APA	Muhs D.R.,Simmons K.R.,Schumann R.R.,Schweig E.S.,&Rowe M.P..(2020).Testing glacial isostatic adjustment models of last-interglacial sea level history in the Bahamas and Bermuda.Quaternary Science Reviews,233.
MLA	Muhs D.R.,et al."Testing glacial isostatic adjustment models of last-interglacial sea level history in the Bahamas and Bermuda".Quaternary Science Reviews 233(2020).