气候变化领域集成服务门户(CCPortal): A lake sediment stable isotope record of late-middle to late Holocene hydroclimate variability in the western Guatemala highlands

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DOI	10.1016/j.epsl.2020.116327
	A lake sediment stable isotope record of late-middle to late Holocene hydroclimate variability in the western Guatemala highlands
	Stansell N.D.; Steinman B.A.; Lachniet M.S.; Feller J.; Harvey W.; Fernandez A.; Shea C.J.; Price B.; Coenen J.; Boes M.; Perdziola S.
发表日期	2020
ISSN	0012821X
卷号	542
英文摘要	Long-term perspectives on past hydroclimate variability provide context for evaluating the potential future impacts of changes in Northern Hemisphere temperatures and oceanic-atmospheric circulation on the timing and distribution of precipitation in Central America. Here we use the isotopic composition of fine-grained (< 63 μm), endogenic CaCO3 (δ18Ocalcite and δ13Ccalcite) from Lake Kail, located in the western highlands of Guatemala, to infer multi-decadal to multi-centennial-scale variability in the balance between precipitation and evaporation (P/E) over the last ∼6000 years. The sediment age model is based on 210Pb and 41 14C ages, with chronological uncertainty estimated using Bayesian methods. A model that couples lake hydrology and isotope mass balance is applied to characterize the isotopic responses of lake water and calcite to changes in drought-controlling climate variables such as precipitation, temperature and relative humidity. The δ18Ocalcite variations indicate intermediate-to-dry P/E conditions during the late-middle Holocene from ∼6000 to ∼4100 cal yr BP. There was then a shift to drier conditions at the start of the late Holocene until ∼3050 cal yr BP, followed by a trend to wetter conditions until ∼1500 cal yr BP. The most recent ∼1500 years is characterized by high and relatively stable P/E, with particularly wet intervals from ∼1500 to 1170 cal yr BP and from 470 to 260 cal yr BP. Comparisons of the Lake Kail δ18Ocalcite record with Central American/circum-Caribbean proxy datasets spanning the late-middle and late Holocene indicate northern tropical hydroclimate changes were highly variable across space and time and were likely driven by regional oceanic-atmospheric responses with a secondary influence by insolation forcing. © 2020 Elsevier B.V.
关键词	Central America insolation northern tropics oxygen isotopes precipitation
英文关键词	Atmospheric humidity; Bayesian networks; Calcite; Calcium carbonate; Climate models; Humidity control; Isotopes; Uncertainty analysis; Atmospheric circulation; Atmospheric response; Centennial scale variability; Isotopic composition; Long-term perspective; Northern Hemispheres; Secondary influences; Temperature and relative humidity; Lakes; air temperature; atmospheric circulation; climate effect; climate variation; decadal variation; evaporation; Holocene; isotopic composition; lacustrine deposit; Northern Hemisphere; oceanic circulation; precipitation (climatology); sediment chemistry; stable isotope; Guatemala [Central America]
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202904
作者单位	Department of Geology and Environmental Geosciences, Northern Illinois University, United States; Large Lakes Observatory, Department of Earth and Environmental Sciences, University of Minnesota Duluth, Duluth, United States; Department of Geoscience, University of Nevada, Las Vegas, United States; Department of Zoology, University of Oxford, Oxford, United Kingdom
推荐引用方式 GB/T 7714	Stansell N.D.,Steinman B.A.,Lachniet M.S.,et al. A lake sediment stable isotope record of late-middle to late Holocene hydroclimate variability in the western Guatemala highlands[J],2020,542.
APA	Stansell N.D..,Steinman B.A..,Lachniet M.S..,Feller J..,Harvey W..,...&Perdziola S..(2020).A lake sediment stable isotope record of late-middle to late Holocene hydroclimate variability in the western Guatemala highlands.Earth and Planetary Science Letters,542.
MLA	Stansell N.D.,et al."A lake sediment stable isotope record of late-middle to late Holocene hydroclimate variability in the western Guatemala highlands".Earth and Planetary Science Letters 542(2020).