globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116327
论文题名:
A lake sediment stable isotope record of late-middle to late Holocene hydroclimate variability in the western Guatemala highlands
作者: 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.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 542
语种: 英语
中文关键词: 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]
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165282
Appears in Collections:气候变化与战略

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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

Recommended Citation:
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]. Earth and Planetary Science Letters,2020-01-01,542
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