| DOI: | 10.1016/j.epsl.2018.02.043
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| Scopus记录号: | 2-s2.0-85043252521
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| 论文题名: | The impact of water loading on postglacial decay times in Hudson Bay |
| 作者: | Han H.K.; Gomez N.
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| 刊名: | Earth and Planetary Science Letters
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| ISSN: | 0012821X
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| 出版年: | 2018
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| 卷: | 489 | | 起始页码: | 156
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| 结束页码: | 165
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| 语种: | 英语
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| 英文关键词: | glacial isostatic adjustment
; Hudson Bay
; mantle viscosity
; North American Ice Sheet-History
; postglacial decay times
; sea-level change
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| Scopus关键词: | Decay (organic)
; Glacial geology
; Ice
; Sea level
; Tectonics
; Decay time
; Glacial Isostatic Adjustments
; Hudson Bay
; Ice sheet history
; Mantle viscosity
; Sealevel change
; Loading
; glaciation
; glacioisostasy
; Holocene
; ice sheet
; Last Glacial Maximum
; sea level change
; spatial distribution
; temporal distribution
; Canada
; Hudson Bay
; James Bay
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| 英文摘要: | Ongoing glacial isostatic adjustment (GIA) due to surface loading (ice and water) variations during the last glacial cycle has been contributing to sea-level changes globally throughout the Holocene, especially in regions like Canada that were heavily glaciated during the Last Glacial Maximum (LGM). The spatial and temporal distribution of GIA, as manifested in relative sea-level (RSL) change, are sensitive to the ice history and the rheological structure of the solid Earth, both of which are uncertain. It has been shown that RSL curves near the center of previously glaciated regions with no ongoing surface loading follow an exponential-like form, with the postglacial decay times associated with that form having a weak sensitivity to the details of the ice loading history. Postglacial decay time estimates thus provide a powerful datum for constraining the Earth's viscous structure and improving GIA predictions. We explore spatial patterns of postglacial decay time predictions in Hudson Bay by decomposing numerically modeled RSL changes into contributions from water and ice loading effects, and computing their relative impact on the decay times. We demonstrate that ice loading can contribute a strong geographic trend on the decay time estimates if the time window used to compute decay times includes periods that are temporally close to (i.e. contemporaneous with, or soon after) periods of active loading. This variability can be avoided by choosing a suitable starting point for the decay time window. However, more surprisingly, we show that across any adopted time window, water loading effects associated with inundation into, and postglacial flux out of, Hudson Bay and James Bay will impart significant geographic variability onto decay time estimates. We emphasize this issue by considering both maps of predicted decay times across the region and site-specific estimates, and we conclude that variability in observed decay times (whether based on existing or future data sets) may reflect this water loading signal. © 2018 Elsevier B.V. |
| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/109972
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| Appears in Collections: | 影响、适应和脆弱性
气候变化事实与影响
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作者单位: | McGill University, Earth and Planetary Sciences, 3450 University Street, Montreal, Quebec H3A 0E8, Canada
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| Recommended Citation: | |
Han H.K.,Gomez N.. The impact of water loading on postglacial decay times in Hudson Bay[J]. Earth and Planetary Science Letters,2018-01-01,489
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