DOI: 10.5194/cp-11-1375-2015
Scopus记录号: 2-s2.0-84944320078
论文题名: Late-glacial to late-Holocene shifts in global precipitation δ18O
作者: Jasechko S. ; Lechler A. ; Pausata F.S.R. ; Fawcett P.J. ; Gleeson T. ; Cendon D.I. ; Galewsky J. ; LeGrande A.N. ; Risi C. ; Sharp Z.D. ; Welker J.M. ; Werner M. ; Yoshimura K.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2015
卷: 11, 期: 10 起始页码: 1375
结束页码: 1393
语种: 英语
Scopus关键词: calcite
; cave deposit
; climate modeling
; general circulation model
; global climate
; groundwater
; Holocene
; ice core
; Last Glacial Maximum
; late glacial
; oxygen isotope
; paleoclimate
; precipitation assessment
; reconstruction
; temperature gradient
英文摘要: Reconstructions of Quaternary climate are often based on the isotopic content of paleo-precipitation preserved in proxy records. While many paleo-precipitation isotope records are available, few studies have synthesized these dispersed records to explore spatial patterns of late-glacial precipitation δ18O. Here we present a synthesis of 86 globally distributed groundwater (n = 59), cave calcite (n=15) and ice core (n=12) isotope records spanning the late-glacial (defined as ∼50 000 to ∼20 000 years ago) to the late-Holocene (within the past ∼5000 years). We show that precipitation δ18O changes from the late-glacial to the late-Holocene range from-7.1‰ (δ18O late-Holocene > δ18O late-glacial) to +1.7‰ (δ18O late-glacial > δ18O late-Holocene), with the majority (77 %) of records having lower late-glacial δ18O than late-Holocene δ18O values. High-magnitude, negative precipitation δ18O shifts are common at high latitudes, high altitudes and continental interiors (δ18O late-Holocene > δ18O late-glacial by more than 3 ‰). Conversely, low-magnitude, positive precipitation δ18O shifts are concentrated along tropical and subtropical coasts (δ18O late-glacial > δ18O late-Holocene by less than 2 ‰). Broad, global patterns of late-glacial to late-Holocene precipitation δ18O shifts suggest that stronger-than-modern isotopic distillation of air masses prevailed during the lateglacial, likely impacted by larger global temperature differences between the tropics and the poles. Further, to test how well general circulation models reproduce global precipitation δ18O shifts, we compiled simulated precipitation δ18O shifts from five isotope-enabled general circulation models simulated under recent and last glacial maximum climate states. Climate simulations generally show better intermodel and model-measurement agreement in temperate regions than in the tropics, highlighting a need for further research to better understand how inter-model spread in convective rainout, seawater δ18O and glacial topography parameterizations impact simulated precipitation δ18O. Future research on paleo-precipitation δ18O records can use the global maps of measured and simulated late-glacial precipitation isotope compositions to target and prioritize field sites. © 2015 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49105
Appears in Collections: 气候变化与战略
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Recommended Citation:
Jasechko S.,Lechler A.,Pausata F.S.R.,et al. Late-glacial to late-Holocene shifts in global precipitation δ18O[J]. Climate of the Past,2015-01-01,11(10)