DOI: 10.5194/cp-8-1109-2012
Scopus记录号: 2-s2.0-84863461658
论文题名: Ranges of moisture-source temperature estimated from Antarctic ice cores stable isotope records over glacial-interglacial cycles
作者: Uemura R. ; Masson-Delmotte V. ; Jouzel J. ; Landais A. ; Motoyama H. ; Stenni B.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2012
卷: 8, 期: 3 起始页码: 1109
结束页码: 1125
语种: 英语
Scopus关键词: air temperature
; deuterium
; distillation
; glacial-interglacial cycle
; ice core
; isotopic ratio
; moisture content
; obliquity
; oxygen isotope
; precipitation (climatology)
; proxy climate record
; Quaternary
; regression analysis
; stable isotope
; temperature gradient
; water vapor
; Antarctica
; Dome Concordia
; Dome Fuji
; East Antarctica
; Vostok Station
英文摘要: A single isotope ratio (δD or δ18O) of water is widely used as an air-temperature proxy in Antarctic ice core records. These isotope ratios, however, do not solely depend on air-temperature but also on the extent of distillation of heavy isotopes out of atmospheric water vapor from an oceanic moisture source to a precipitation site. The temperature changes at the oceanic moisture source (ΔTsource) and at the precipitation site (ΔTsite) can be retrieved by using deuterium-excess (d) data. A new d record from Dome Fuji, Antarctica spanning the past 360 000 yr is presented and compared with records from Vostok and EPICA Dome C ice cores. In previous studies, to retrieve ΔTsource and ΔT site information, different linear regression equations were proposed using theoretical isotope distillation models. A major source of uncertainty lies in the coefficient of regression, βsite which is related to the sensitivity of d to ΔTsite. We show that different ranges of temperature and selections of isotopic model outputs may increase the value of βsite by more than a factor of two. To explore the impacts of this coefficient on reconstructed temperatures, we apply for the first time the exact same methodology to the isotope records from the three Antarctica ice cores. We show that uncertainties in the βsite coefficient strongly affect (i) the glacial-interglacial magnitude of ΔTsource; (ii) the imprint of obliquity in ΔTsource and in the site-source temperature gradient. By contrast, we highlight the robustness of ΔT site reconstruction using water isotopes records. © 2012 Author(s). CC Attribution 3.0 License.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49575
Appears in Collections: 气候变化与战略
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Recommended Citation:
Uemura R.,Masson-Delmotte V.,Jouzel J.,et al. Ranges of moisture-source temperature estimated from Antarctic ice cores stable isotope records over glacial-interglacial cycles[J]. Climate of the Past,2012-01-01,8(3)