DOI: 10.1038/s41561-020-00670-4
论文题名: Extensive wetland development in mid-latitude North America during the Bølling–Allerød
作者: Byun E. ; Sato H. ; Cowling S.A. ; Finkelstein S.A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期: 1 起始页码: 30
结束页码: 35
语种: 英语
英文关键词: Allerod
; biome
; Bolling
; interstadial
; last deglaciation
; Laurentide Ice Sheet
; meltwater
; midlatitude environment
; paleoecology
; pollen
; reconstruction
; wetland
; Younger Dryas
; Midwest
; North America
; United States
英文摘要: Palaeoecological reconstructions of the American Midwest during the last deglaciation suggest the expansion of parkland biomes lacking modern analogues. Despite their spatial extent and persistence over several millennia, the landscape configuration and environmental drivers for the ‘no analogue’ biomes remain speculative. Here we use regression analysis linking settlement-era forest composition and wetland extent to identify specific trees and forest units strongly indicative of high wetland prevalence. We then recompile a regional pollen time series to show transient increases in these flood-tolerant trees, with prominent peaks during the Bølling–Allerød interstadial (~14.6–12.8 thousand years ago). Taken together, the pollen records, and analyses of settlement-era forest composition and wetland prevalence, suggest the establishment of extensive deglacial wetlands in the American Midwest (40–60% of land cover). This extensive, yet transient, wetland was possibly supported by southward discharge of Laurentide Ice Sheet meltwater during the Bølling–Allerød. The timing of this wetland expansion and its mid-latitude location have implications for deglacial methane source dynamics; our estimate of ~11 Tg yr−1 of methane is comparable to the northern source enhancement modelled from ice-core records. Regional decline of the Laurentide Ice Sheet meltwater discharge at the onset of the Younger Dryas (~12.8–11.7 thousand years ago) explains in part why these no-analogue wetland-rich parklands sharply declined, weakening this potential methane source. © 2020, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169728
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth Sciences, University of Toronto, Toronto, ON, Canada; Ecohydrology Research Group, University of Waterloo, Waterloo, ON, Canada
Recommended Citation:
Byun E.,Sato H.,Cowling S.A.,et al. Extensive wetland development in mid-latitude North America during the Bølling–Allerød[J]. Nature Geoscience,2021-01-01,14(1)