DOI: 10.5194/cp-12-171-2016
Scopus记录号: 2-s2.0-84956902519
论文题名: Spatial and temporal oxygen isotope variability in northern Greenland-implications for a new climate record over the past millennium
作者: Weißbach S. ; Wegner A. ; Opel T. ; Oerter H. ; Vinther B.M. ; Kipfstuhl S.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2016
卷: 12, 期: 2 起始页码: 171
结束页码: 188
语种: 英语
Scopus关键词: climate variation
; ice core
; Little Ice Age
; Medieval
; oxygen isotope
; paleoclimate
; paleoenvironment
; signal-to-noise ratio
; spatiotemporal analysis
; temperature effect
; topography
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: We present for the first time all 12 δ18O records obtained from ice cores drilled in the framework of the North Greenland Traverse (NGT) between 1993 and 1995 in northern Greenland. The cores cover an area of 680 km × 317 km, 10% of the Greenland ice sheet. Depending on core length (100-175 m) and accumulation rate (90-200 kgm-2 a-1) the single records reflect an isotope-temperature history over the last 500-1100 years. Lowest δ18O mean values occur north of the summit and east of the main divide as a consequence of Greenland's topography. In general, ice cores drilled on the main ice divide show different results than those drilled east of the main ice divide that might be influenced by secondary regional moisture sources. A stack of all NGT records and the NGRIP record is presented with improved signal-to-noise ratio. Compared to single records, this stack represents the mean δ18O signal for northern Greenland that is interpreted as proxy for temperature. Our northern Greenland δ18O stack indicates distinctly enriched δ18O values during medieval times, about AD1420 20 and from AD1870 onwards. The period between AD1420 and AD1850 has depleted δ18O values compared to the average for the entire millennium and represents the Little Ice Age. The δ18O values of the 20th century are comparable to the medieval period but are lower than that about AD1420. © 2016 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49068
Appears in Collections: 气候变化与战略
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Recommended Citation:
Weißbach S.,Wegner A.,Opel T.,et al. Spatial and temporal oxygen isotope variability in northern Greenland-implications for a new climate record over the past millennium[J]. Climate of the Past,2016-01-01,12(2)