DOI: 10.5194/cp-8-1-2012
Scopus记录号: 2-s2.0-84855555616
论文题名: Deglaciation records of 17O-excess in East Antarctica: Reliable reconstruction of oceanic normalized relative humidity from coastal sites
作者: Winkler R. ; Landais A. ; Sodemann H. ; Dümbgen L. ; Prié F. ; Masson-Delmotte V. ; Stenni B. ; Jouzel J.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2012
卷: 8, 期: 1 起始页码: 1
结束页码: 16
语种: 英语
Scopus关键词: coastal zone
; ice core
; isotopic composition
; last deglaciation
; Last Glacial Maximum
; moisture content
; oxygen isotope
; reconstruction
; relative humidity
; sensitivity analysis
; temporal distribution
; Antarctica
; East Antarctica
; Vostok Station
英文摘要: We measured δ 17O and δ 18O in two Antarctic ice cores at EPICA Dome C (EDC) and TALDICE (TD), respectively, and computed 17O-excess with respect to VSMOW. The comparison of our 17O-excess data with the previous record obtained at Vostok (Landais et al., 2008a) revealed differences up to 35 ppm in 17O-excess mean level and evolution for the three sites. Our data show that the large increase depicted at Vostok (20 ppm) during the last deglaciation is a regional and not a general pattern in the temporal distribution of 17O-excess in East Antarctica. The EDC data display an increase of 12 ppm, whereas the TD data show no significant variation from the Last Glacial Maximum (LGM) to the Early Holocene (EH). A Lagrangian moisture source diagnostic revealed very different source regions for Vostok and EDC compared to TD. These findings combined with the results of a sensitivity analysis, using a Rayleigh-type isotopic model, suggest that normalized relative humidity (RHn) at the oceanic source region (OSR) is a determining factor for the spatial differences of 17O-excess in East Antarctica. However, 17O-excess in remote sites of continental Antarctica (e.g. Vostok) may be highly sensitive to local effects. Hence, we consider 17O-excess in coastal East Antarctic ice cores (TD) to be more reliable as a proxy for RHn at the OSR. © Author(s) 2012. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49629
Appears in Collections: 气候变化与战略
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Recommended Citation:
Winkler R.,Landais A.,Sodemann H.,et al. Deglaciation records of 17O-excess in East Antarctica: Reliable reconstruction of oceanic normalized relative humidity from coastal sites[J]. Climate of the Past,2012-01-01,8(1)