DOI: 10.1016/j.quascirev.2015.10.021
Scopus记录号: 2-s2.0-84937048309
论文题名: Holocene climate changes in eastern Beringia (NW North America) – A systematic review of multi-proxy evidence
作者: Kaufman D.S. ; Axford Y.L. ; Henderson A.C.G. ; McKay N.P. ; Oswald W.W. ; Saenger C. ; Anderson R.S. ; Bailey H.L. ; Clegg B. ; Gajewski K. ; Hu F.S. ; Jones M.C. ; Massa C. ; Routson C.C. ; Werner A. ; Wooller M.J. ; Yu Z.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 147 起始页码: 312
结束页码: 339
语种: 英语
英文关键词: Alaska
; Beringia
; Climate change
; Holocene
; Multi-proxy
; Paleoclimate
; Synthesis
; Yukon
Scopus关键词: Atmospheric temperature
; Climate models
; Earth (planet)
; Glacial geology
; Isotopes
; Lakes
; Moisture
; Oceanography
; Sea ice
; Surface waters
; Synthesis (chemical)
; Thawing
; Time series analysis
; Wetlands
; Alaska
; Beringia
; Holocenes
; Multi proxies
; Paleoclimates
; Yukon
; Climate change
; Chironomidae
英文摘要: Reconstructing climates of the past relies on a variety of evidence from a large number of sites to capture the varied features of climate and the spatial heterogeneity of climate change. This review summarizes available information from diverse Holocene paleoenvironmental records across eastern Beringia (Alaska, westernmost Canada and adjacent seas), and it quantifies the primary trends of temperature- and moisture-sensitive records based in part on midges, pollen, and biogeochemical indicators (compiled in the recently published Arctic Holocene database, and updated here to v2.1). The composite time series from these proxy records are compared with new summaries of mountain-glacier and lake-level fluctuations, terrestrial water-isotope records, sea-ice and sea-surface-temperature analyses, and peatland and thaw-lake initiation frequencies to clarify multi-centennial- to millennial-scale trends in Holocene climate change. To focus the synthesis, the paleo data are used to frame specific questions that can be addressed with simulations by Earth system models to investigate the causes and dynamics of past and future climate change. This systematic review shows that, during the early Holocene (11.7–8.2 ka; 1 ka = 1000 cal yr BP), rather than a prominent thermal maximum as suggested previously, temperatures were highly variable, at times both higher and lower than present (approximate mid-20th-century average), with no clear spatial pattern. Composited pollen, midge and other proxy records average out the variability and show the overall lowest summer and mean-annual temperatures across the study region during the earliest Holocene, followed by warming over the early Holocene. The sparse data available on early Holocene glaciation show that glaciers in southern Alaska were as extensive then as they were during the late Holocene. Early Holocene lake levels were low in interior Alaska, but moisture indicators show pronounced differences across the region. The highest frequency of both peatland and thaw-lake initiation ages also occurred during the early Holocene. During the middle Holocene (8.2–4.2 ka), glaciers retreated as the regional average temperature increased to a maximum between 7 and 5 ka, as reflected in most proxy types. Following the middle Holocene thermal maximum, temperatures decreased starting between 4 and 3 ka, signaling the onset of Neoglacial cooling. Glaciers in the Brooks and Alaska Ranges advanced to their maximum Holocene extent as lakes generally rose to modern levels. Temperature differences for averaged 500-year time steps typically ranged by 1–2 °C for individual records in the Arctic Holocene database, with a transition to a cooler late Holocene that was neither abrupt nor spatially coherent. The longest and highest-resolution terrestrial water isotope records previously interpreted to represent changes in the Aleutian low-pressure system around this time are here shown to be largely contradictory. Furthermore, there are too few records with sufficient resolution to identify sub-centennial-scale climate anomalies, such as the 8.2 ka event. The review concludes by suggesting some priorities for future paleoclimate research in the region. © 2015 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59518
Appears in Collections: 过去全球变化的重建
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作者单位: School of Earth Sciences & Environmental Sustainability, Northern Arizona University, Flagstaff, AZ, United States; Department of Earth & Planetary Sciences, Northwestern University, Evanston, IL, United States; School of Geography, Politics & Sociology, Newcastle University, United Kingdom; Institute for Liberal Arts & Interdisciplinary Studies, Emerson College, Boston, MA, United States; Joint Institute for the Study of the Atmosphere & Ocean, University of Washington, Seattle, WA, United States; School of Integrative Biology, University of Illinois, Urbana, IL, United States; Department of Geography, University of Ottawa, Ottawa, ON, Canada; Department of Plant Biology and Department of Geology, University of Illinois, Urbana, IL, United States; Eastern Geology & Paleoclimate Science Center, U.S. Geological Survey, Reston, VA, United States; Department of Earth & Environmental Sciences, Lehigh University, Bethlehem, PA, United States; Geology Department, Mount Holyoke College, South Hadley, MA, United States; Water & Environmental Research Center, School of Fisheries & Ocean Sciences, University of Alaska Fairbanks, Fairbanks, AK, United States
Recommended Citation:
Kaufman D.S.,Axford Y.L.,Henderson A.C.G.,et al. Holocene climate changes in eastern Beringia (NW North America) – A systematic review of multi-proxy evidence[J]. Quaternary Science Reviews,2016-01-01,147