DOI: 10.5194/tc-9-925-2015
Scopus记录号: 2-s2.0-85006980920
论文题名: Climatic signals from 76 shallow firn cores in Dronning Maud Land, East Antarctica
作者: Altnau S ; , Schlosser E ; , Isaksson E ; , Divine D
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期: 3 起始页码: 925
结束页码: 944
语种: 英语
英文关键词: Antarctic Oscillation
; atmospheric circulation
; climate signal
; firn
; glacier mass balance
; ice core
; ice shelf
; oxygen isotope
; signal-to-noise ratio
; spatial distribution
; temporal distribution
; thermodynamics
; twentieth century
; Antarctica
; East Antarctica
; Neumayer Station
; Queen Maud Land
英文摘要: The spatial and temporal distribution of surface mass balance (SMB) and δ18O were investigated in the first comprehensive study of a set of 76 firn cores retrieved by various expeditions during the past 3 decades in Dronning Maud Land, East Antarctica. The large number of cores was used to calculate stacked records of SMB and δ18O, which considerably increased the signal-to-noise ratio compared to earlier studies and facilitated the detection of climatic signals. Considerable differences between cores from the interior plateau and the coastal cores were found. The δ18O of both the plateau and the ice shelf cores exhibit a slight positive trend over the second half of the 20th century. In the corresponding period, the SMB has a negative trend in the ice shelf cores, but increases on the plateau. Comparison with meteorological data from Neumayer Station revealed that for the ice shelf regions, atmospheric dynamic effects are more important than thermodynamics while on the plateau; the temporal variations of SMB and δ18O occur mostly in parallel, and thus can be explained by thermodynamic effects. The Southern Annular Mode (SAM) has exhibited a positive trend since the mid-1960s, which is assumed to lead to a cooling of East Antarctica. This is not confirmed by the firn core data in our data set. Changes in the atmospheric circulation that result in a changed seasonal distribution of precipitation/accumulation could partly explain the observed features in the ice shelf cores. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75362
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Institute of Meteorology and Geophysics, Centre for Climate and Cryosphere, University of Innsbruck, Innsbruck, Austria; Deutscher Wetterdienst (DWD), Offenbach, Germany; Austrian Polar Research Institute, Vienna, Austria; Norwegian Polar Institute, Fram Centre, Tromsø, Norway
Recommended Citation:
Altnau S,, Schlosser E,, Isaksson E,et al. Climatic signals from 76 shallow firn cores in Dronning Maud Land, East Antarctica[J]. Cryosphere,2015-01-01,9(3)