DOI: 10.1016/j.quascirev.2017.12.022
Scopus记录号: 2-s2.0-85039980499
论文题名: Compound-specific isotope records of late-quaternary environmental change in southeastern North Carolina
作者: Lane C.S. ; Taylor A.K. ; Spencer J. ; Jones K.B.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 182 起始页码: 48
结束页码: 64
语种: 英语
英文关键词: Atlantic coastal plain
; Deuterium
; Hydrogen
; Lake sediment
; n-alkane
; North America
; Paleolimnology
Scopus关键词: Analytical geochemistry
; Carbon
; Charcoal
; Deuterium
; Ecosystems
; Groundwater
; Hydrogen
; Hydrology
; Isotopes
; Lakes
; Landforms
; Paleolimnology
; Paraffins
; Plants (botany)
; Coastal plain
; Compound-specific isotopes
; Lake sediments
; Land management practices
; n-Alkanes
; North America
; Pacific decadal oscillation
; Pleistocene-Holocene transition
; Ecology
; alkane
; arid region
; aridity
; Bolling
; C4 plant
; carbon isotope
; coastal plain
; colonization
; coniferous tree
; deuterium
; environmental change
; hydrogen isotope
; isotopic analysis
; lacustrine deposit
; Pacific Decadal Oscillation
; paleohydrology
; paleolimnology
; prehistoric
; Quaternary
; reconstruction
; water table
; Younger Dryas
; Arctic
; Atlantic Coast [North America]
; Atlantic Coast [United States]
; Greenland
; North Carolina
; Tennessee
; United States
; Quercus
英文摘要: Reconstructions of late Quaternary paleohydrology are rare from the U.S. Atlantic coastal plain (ACP). Here we present compound-specific hydrogen (δ2Halkane) and carbon (δ13Calkane) isotope analyses of terrestrially-derived n-alkanes from Jones Lake and Singletary Lake in eastern North Carolina spanning the last ∼50,000 years. Combined with pollen, charcoal, and bulk geochemical analyses, the δ2Halkane data indicate arid conditions during the late-Pleistocene, but differing edaphic conditions at the sites perhaps related to differing water table depths. The δ13Calkane data indicate a significant C4 plant component during the late Pleistocene, but other proxies indicate a sparsely-vegetated landscape. The Pleistocene-Holocene transition is marked by rapid fluctuations in δ2Halkane values that are similar to the patterns of Bølling Allerød and Younger Dryas isotope data from Greenland indicating sensitivity of the regional climate to short-lived, high-amplitude climatic events. The δ2Halkane data indicate a mesic early Holocene that supported colonization by Quercus-dominated ecosystems. Evidence of middle Holocene aridity in eastern Tennessee and western North Carolina contrasts with evidence of mesic conditions on the ACP, a geographic pattern similar to modern teleconnected precipitation responses to the Pacific Decadal Oscillation. A transition to Pinus-dominated ecosystems ∼5500 cal yr B.P. is accompanied by a large increase charcoal, but is not coincident with any large changes in δ2Halkane values, indicating that hydrologic change was likely not responsible for sustained late-Holocene dominance of Pinus. The lack of a change in middle Holocene hydrology and the spatiotemporally heterogeneous nature of the Quercus-Pinus transition on the ACP indicate prehistoric anthropogenic land management practices may represent the most parsimonious explanation for the regionally pervasive ecological change. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112298
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Earth and Ocean Sciences, University of North Carolina Wilmington, Wilmington, NC 28403, United States
Recommended Citation:
Lane C.S.,Taylor A.K.,Spencer J.,et al. Compound-specific isotope records of late-quaternary environmental change in southeastern North Carolina[J]. Quaternary Science Reviews,2018-01-01,182