globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.05.012
Scopus记录号: 2-s2.0-85021178686
论文题名:
Younger-Dryas cooling and sea-ice feedbacks were prominent features of the Pleistocene-Holocene transition in Arctic Alaska
作者: Gaglioti B.V.; Mann D.H.; Wooller M.J.; Jones B.M.; Wiles G.C.; Groves P.; Kunz M.L.; Baughman C.A.; Reanier R.E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 169
起始页码: 330
结束页码: 343
语种: 英语
英文关键词: Arctic Alaska ; Bering Strait ; Climate change ; Dendrochronology ; North Pacific ; Oxygen isotopes ; Paleoclimate ; Sea ice ; Younger Dryas
Scopus关键词: Climatology ; Distillation ; Ecology ; Ice ; Isotopes ; Sea ice ; Wood ; Arctic Alaska ; Bering strait ; Dendrochronology ; North Pacific ; Oxygen isotopes ; Paleoclimates ; Younger Dryas ; Climate change ; Salix
英文摘要: Declining sea-ice extent is currently amplifying climate warming in the Arctic. Instrumental records at high latitudes are too short-term to provide sufficient historical context for these trends, so paleoclimate archives are needed to better understand the functioning of the sea ice-albedo feedback. Here we use the oxygen isotope values of wood cellulose in living and sub-fossil willow shrubs (δ18Owc) (Salix spp.) that have been radiocarbon-dated (14C) to produce a multi-millennial record of climatic change on Alaska's North Slope during the Pleistocene-Holocene transition (13,500–7500 calibrated 14C years before present; 13.5–7.5 ka). We first analyzed the spatial and temporal patterns of δ18Owc in living willows growing at upland sites and found that over the last 30 years δ18Owc values in individual growth rings correlate with local summer temperature and inter-annual variations in summer sea-ice extent. Deglacial δ18Owc values from 145 samples of subfossil willows clearly record the Allerød warm period (∼13.2 ka), the Younger Dryas cold period (12.9–11.7 ka), and the Holocene Thermal Maximum (11.7–9.0 ka). The magnitudes of isotopic changes over these rapid climate oscillations were ∼4.5‰, which is about 60% of the differences in δ18Owc between those willows growing during the last glacial period and today. Modeling of isotope-precipitation relationships based on Rayleigh distillation processes suggests that during the Younger Dryas these large shifts in δ18Owc values were caused by interactions between local temperature and changes in evaporative moisture sources, the latter controlled by seaice extent in the Arctic Ocean and Bering Sea. Based on these results and on the effects that sea-ice have on climate today, we infer that ocean-derived feedbacks amplified temperature changes and enhanced precipitation in coastal regions of Arctic Alaska during warm times in the past. Today, isotope values in willows on the North Slope of Alaska are similar to those growing during the warmest times of the Pleistocene-Holocene transition, which were times of widespread permafrost thaw and striking ecological changes. © 2017 Elsevier Ltd
资助项目: The National Institute of Water Resources Alaska division funded this study along with the National Science Foundation (NSF grants: PLR-1417036 and 1417611) and the Bureau of Land Management. We thank Dan Cross-Call, Andrew Weller, Joe Gaglioti, and Louise Farquharson for help in the field. Nick Wiesenburg helped with cross-dating shrub rings. Kim Sparks, Shane Billings, Tim Howe, and Norma Haubenstock contributed greatly to cellulose extractions. We benefitted from discussions with Eric Klein, Jeff Welker, Bruce Finney, Laia Andreu-Hayles, and Lesleigh Anderson. Comments from Trevor Porter and an anonymous reviewer improved this manuscript. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. This is LDEO contribution #8113.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59171
Appears in Collections:过去全球变化的重建

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作者单位: Lamont-Doherty Earth Observatory of Columbia University, 61 Route 9w, Palisades, NY, United States; Department of Geosciences, University of Alaska Fairbanks, 900 Yukon Dr., Fairbanks, AK, United States; Water and Environmental Research Center, College of Fisheries and Ocean Sciences, University of Alaska Fairbanks, 306 Tanana Dr., Fairbanks, AK, United States; Alaska Science Center, US Geological Survey, 4210 University Dr., Anchorage, AK, United States; Department of Geology, College of Wooster, 1189 Beall Ave., Wooster, OH, United States; Institute of Arctic Biology, University of Alaska Fairbanks, 902 North Koyukuk Dr., Fairbanks, AK, United States; School of Natural Resources and Extension, University of Alaska Fairbanks, P.O. Box 757140, Fairbanks, AK, United States; Reanier & Associates Inc., 1215 SW 170th St., Seattle, WA, United States

Recommended Citation:
Gaglioti B.V.,Mann D.H.,Wooller M.J.,et al. Younger-Dryas cooling and sea-ice feedbacks were prominent features of the Pleistocene-Holocene transition in Arctic Alaska[J]. Quaternary Science Reviews,2017-01-01,169
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