DOI: 10.5194/cp-11-1153-2015
Scopus记录号: 2-s2.0-84941928286
论文题名: A millennial summer temperature reconstruction for northeastern Canada using oxygen isotopes in subfossil trees
作者: Naulier M. ; Savard M.M. ; Bégin C. ; Gennaretti F. ; Arseneault D. ; Marion J. ; Nicault A. ; Bégin Y.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2015
卷: 11, 期: 9 起始页码: 1153
结束页码: 1164
语种: 英语
Scopus关键词: climate variation
; Little Ice Age
; nineteenth century
; oxygen isotope
; paleoclimate
; paleotemperature
; reconstruction
; shore (nonmarine)
; solar activity
; subfossil
; summer
; tree
; tree ring
; volcanic eruption
; Arctic Ocean
; Baffin Bay [Arctic Ocean]
; Canada
; Fennoscandia
英文摘要: Climatic reconstructions for northeastern Canada are scarce such that this area is under-represented in global temperature reconstructions. To fill this lack of knowledge and identify the most important processes influencing climate variability, this study presents the first summer temperature reconstruction for eastern Canada based on a millennial oxygen isotopic series (δ18MO) from tree rings. For this purpose, we selected 230 well-preserved subfossil stems from the bottom of a boreal lake and five living trees on the lakeshore. The sampling method permitted an annually resolved δ18MO series with a replication of five trees per year. The June to August maximal temperature of the last millennium has been reconstructed using the statistical relation between Climatic Research Unit (CRU TS3.1) and δ18MO data. The resulting millennial series is marked by the well-defined Medieval Climate Anomaly (MCA; AD 1000-1250), the Little Ice Age (AD 1450-1880) and the modern period (AD 1950-2010), and an overall average cooling trend of -0.6 °C millenniumg-1. These climatic periods and climatic low-frequency trends are in agreement with the only reconstruction available for northeastern Canada and others from nearby regions (Arctic, Baffin Bay) as well as some remote regions like the Canadian Rockies or Fennoscandia. Our temperature reconstruction indicates that the Medieval Climate Anomaly was characterized by a temperature range similar to the one of the modern period in the study region. However, the temperature increase during the last 3 decades is one of the fastest warming observed over the last millennium (+1.9 °C between 1970-2000). An additional key finding of this research is that the coldest episodes mainly coincide with low solar activities and the extremely cold period of the early 19th century has occurred when a solar minimum was in phase with successive intense volcanic eruptions. Our study provides a new perspective unraveling key mechanisms that controlled the past climate shifts in northeastern Canada. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49119
Appears in Collections: 气候变化与战略
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Recommended Citation:
Naulier M.,Savard M.M.,Bégin C.,et al. A millennial summer temperature reconstruction for northeastern Canada using oxygen isotopes in subfossil trees[J]. Climate of the Past,2015-01-01,11(9)