气候变化领域集成服务门户(CCPortal): Deglacial temperature controls on no-analog community establishment in the Great Lakes Region

CCPortal

DOI	10.1016/j.quascirev.2020.106245
	Deglacial temperature controls on no-analog community establishment in the Great Lakes Region
	Fastovich D.; Russell J.M.; Jackson S.T.; Williams J.W.
发表日期	2020
ISSN	0277-3791
卷号	234
英文摘要	Understanding the drivers of vegetation dynamics and no-analog communities in eastern North America is hampered by a scarcity of independent temperature indicators. We present a new branched glycerol dialkyl glycerol tetraether (brGDGT) temperature record from Bonnet Lake, Ohio (18–8 ka) and report uncertainty estimates based on Bayesian linear regression and bootstrapping. We also reanalyze a previously published brGDGT record from Silver Lake, Ohio, using improved chromatographic methods. All pollen- and brGDGT-based temperature reconstructions showed qualitatively similar deglacial trends but varying magnitudes. Separating 5- and 6- methyl brGDGTs resulted in substantially lower estimates of deglacial temperature variations (6.4 °C) than inferred from earlier brGDGT methods and pollen (11.8 °C, 12.0 °C respectively). Similar trends among proxies suggest good fidelity of brGDGTs to temperature, despite calibration uncertainties. At both sites, the rise and decline of no-analog communities closely track brGDGT-inferred temperatures, with a lag of 0–150 years. The timing of temperature and ecological events varies between Bonnet and Silver Lakes, likely due to age model uncertainties. Climate sensitivity analyses indicate a linear sensitivity of vegetation composition to temperature variations, albeit noisy and significant only with a 500-year bin. The formation of no-analog plant communities in the upper Midwest is closely linked to late-glacial warming, but other factors, such as temperature seasonality or end-Pleistocene megafaunal extinctions, remain viable. © 2020 Elsevier Ltd
英文关键词	Biomarkers; brGDGT; Climate sensitivity; Lagoons & swamps; Lakes; No-analog vegetation; North America; Paleoclimatology; Pleistocene; Pollen; Sedimentology; Temperature
语种	英语
scopus关键词	Biomarkers; Chromatographic analysis; Glycerol; Lakes; Sedimentology; Silver; Temperature; Temperature distribution; Uncertainty analysis; Vegetation; brGDGT; Climate sensitivity; North America; Paleoclimatology; Pleistocene; Pollen; Sensitivity analysis; deglaciation; paleoclimate; plant community; Pleistocene; pollen; sedimentology; temperature effect; vegetation dynamics; Great Lakes [North America]; Midwest; Silver Lake; United States
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/151528
作者单位	Department of Geography, University of Wisconsin-Madison, Madison, WI 53706, United States; Center for Climatic Research, University of Wisconsin-Madison, Madison, WI 53706, United States; Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI 02912, United States; Southwest Climate Adaptation Science Center, U.S. Geologic Survey, Tucson, AZ 85721, United States; Department of Geosciences, University of Arizona, University of Arizona, Tucson, AZ 85721, United States
推荐引用方式 GB/T 7714	Fastovich D.,Russell J.M.,Jackson S.T.,et al. Deglacial temperature controls on no-analog community establishment in the Great Lakes Region[J],2020,234.
APA	Fastovich D.,Russell J.M.,Jackson S.T.,&Williams J.W..(2020).Deglacial temperature controls on no-analog community establishment in the Great Lakes Region.Quaternary Science Reviews,234.
MLA	Fastovich D.,et al."Deglacial temperature controls on no-analog community establishment in the Great Lakes Region".Quaternary Science Reviews 234(2020).