DOI: 10.1016/j.quascirev.2017.07.013
Scopus记录号: 2-s2.0-85026219588
论文题名: Winter temperature conditions (1670–2010) reconstructed from varved sediments, western Canadian High Arctic
作者: Amann B. ; Lamoureux S.F. ; Boreux M.P.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 172 起始页码: 1
结束页码: 14
语种: 英语
英文关键词: Climate change
; Lake sediments
; Paleoclimatology
; Sedimentology
; Snow melt
; Winter climate
Scopus关键词: Calibration
; Catchments
; Climate models
; Climatology
; Correlation methods
; Lakes
; Runoff
; Sedimentology
; Sediments
; Snow
; Snow melting systems
; Climate model simulations
; Lake sediments
; Lake-sediment records
; Paleoclimatology
; Snow melt
; Statistical correlation
; Temperature conditions
; Winter climate
; Climate change
英文摘要: Advances in paleoclimatology from the Arctic have provided insights into long-term climate conditions. However, while past annual and summer temperature have received considerable research attention, comparatively little is known about winter paleoclimate. Arctic winter is of special interest as it is the season with the highest sensitivity to climate change, and because it differs substantially from summer and annual measures. Therefore, information about past changes in winter climate is key to improve our knowledge of past forced climate variability and to reduce uncertainty in climate projections. In this context, Arctic lakes with snowmelt-fed catchments are excellent potential winter climate archives. They respond strongly to snowmelt-induced runoff, and indirectly to winter temperature and snowfall conditions. To date, only a few well-calibrated lake sediment records exist, which appear to reflect site-specific responses with differing reconstructions. This limits the possibility to resolve large-scale winter climate change prior the instrumental period. Here, we present a well-calibrated quantitative temperature and snowfall record for the extended winter season (November through March; NDJFM) from Chevalier Bay (Melville Island, NWT, Canadian Arctic) back to CE 1670. The coastal embayment has a large catchment influenced by nival terrestrial processes, which leads to high sedimentation rates and annual sedimentary structures (varves). Using detailed microstratigraphic analysis from two sediment cores and supported by μ-XRF data, we separated the nival sedimentary units (spring snowmelt) from the rainfall units (summer) and identified subaqueous slumps. Statistical correlation analysis between the proxy data and monthly climate variables reveals that the thickness of the nival units can be used to predict winter temperature (r = 0.71, pc < 0.01, 5-yr filter) and snowfall (r = 0.65, pc < 0.01, 5-yr filter) for the western Canadian High Arctic over the last ca. 400 years. Results reveal a strong variability in winter temperature back to CE 1670 with the coldest decades reconstructed for the period CE 1800–1880, while the warmest decades and major trends are reconstructed for the period CE 1880–1930 (0.26°C/decade) and CE 1970–2010 (0.37°C/decade). Although the first aim of this study was to increase the paleoclimate data coverage for the winter season, the record from Chevalier Bay also holds great potential for more applied climate research such as data-model comparisons and proxy–data assimilation in climate model simulations. © 2017 Elsevier Ltd 资助项目: This research was carried out within the Swiss National Science Foundation grant P2BEP2_162029, and supported by NSERC/CRSNS 2015-05276. We thank K. Kathan and E. Kjikjerkovska for their early contributions to research on Chevalier Bay. Thanks to A. Normandeau, J. Fouché, G. King, and A. Rudy for fruitful discussions. Particular thanks also go to the PEARL Lab of J. Smol for access to the gamma counter, and to C. Grooms and B. Sivarajah for their help with sample preparation and dating. We would also like to acknowledge Polar Continental Shelf Program, Natural Resources Canada for field logistics support. Constructive comments from two anonymous reviewers are appreciated.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59118
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography and Planning, Queen's University, Kingston, ON, Canada
Recommended Citation:
Amann B.,Lamoureux S.F.,Boreux M.P.. Winter temperature conditions (1670–2010) reconstructed from varved sediments, western Canadian High Arctic[J]. Quaternary Science Reviews,2017-01-01,172