DOI: 10.1016/j.palaeo.2012.10.040
论文题名: Annually resolved temperature reconstructions from a late Pliocene-early Pleistocene polar forest on Bylot Island, Canada
作者: Csank A.Z. ; Fortier D. ; Leavitt S.W.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 369 起始页码: 313
结束页码: 322
语种: 英语
英文关键词: Arctic
; Pliocene climate
; Stable isotopes
; Temperature
; Tree rings
英文摘要: Here we use δ18O ratios measured in tree rings of crossdated sub-fossil wood to reconstruct an annually resolved record of temperature and δ18O of meteoric water for an interglacial late Pliocene-early Pleistocene fossil forest found on Bylot Island, Nunavut, Canada. Our record represents the first crossdated record of Pliocene wood. Mean annual temperatures determined in this study average -3.4±3.8°C, which is 11.4±4.4°C warmer than present-day Bylot Island (-14.8±2.2°C). June-July temperatures average 13.5±1.1°C, approximately 12.6±1.6°C warmer than present-day. Meteoric water δ18O values average -15.5±2.9‰, ~2-6‰ more enriched than present values of precipitation δ18O. Our temperatures are comparable to mid-Pliocene modeled temperatures for the Arctic (3-5°C warmer than present), suggesting that interglacial warm periods in the late Pliocene-early Pleistocene may have been as warm as the mid-Pliocene warm period. That both the Bylot Island forest deposit and the Kap København deposit represent the remains of northern tree-line vegetation that lived during warm interglacial periods within the overall cool Plio-Pleistocene suggests that forest deposits in the Arctic capture a snapshot of interglacial conditions during the Plio-Pleistocene rather than the average Pliocene climate and may not be suitable records to study Pliocene cooling. © 2012 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69893
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geosciences, University of Arizona, Tucson, AZ 85721, United States; Laboratory of Tree-Ring Research, University of Arizona, Tucson, AZ 85721, United States; Département de Géographie, Université de Montréal, Montréal, QC, H2V 2B8, Canada; Centre d'Études Nordiques, Université Laval, Québec, QC, G1V 0A6, Canada
Recommended Citation:
Csank A.Z.,Fortier D.,Leavitt S.W.. Annually resolved temperature reconstructions from a late Pliocene-early Pleistocene polar forest on Bylot Island, Canada[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,369