DOI: 10.5194/cp-8-1153-2012
Scopus记录号: 2-s2.0-84863817799
论文题名: Millennial-length forward models and pseudoproxies of stalagmite δ18O: An example from NW Scotland
作者: Baker A. ; Bradley C. ; Phipps S.J. ; Fischer M. ; Fairchild I.J. ; Fuller L. ; Spaptl C. ; Azcurra C.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2012
卷: 8, 期: 4 起始页码: 1153
结束页码: 1167
语种: 英语
Scopus关键词: climate variation
; groundwater flow
; hydrological modeling
; karst
; numerical model
; oxygen isotope
; proxy climate record
; reconstruction
; stable isotope
; stalagmite
; Scotland
; United Kingdom
英文摘要: The stable oxygen isotope parameter δ18O remains the most widely utilised speleothem proxy for past climate reconstructions. Uncertainty can be introduced into stalagmite δ18O from a number of factors, one of which is the heterogeneity of groundwater flow in karstified aquifers. Here, we present a lumped parameter hydrological model, KarstFor, which is capable of generating monthly simulations of surface water - ground water - stalagmite δ18O for more than thousand-year time periods. Using a variety of climate input series, we use this model for the first time to compare observational with modelled (pseudoproxy) stalagmite δ18O series for a site at Assynt, NW Scotland, where our knowledge of δ18O systematics is relatively well understood. The use of forward modelling allows us to quantify the relative contributions of climate, peat and karst hydrology, and disequilibrium effects in stalagmite δ18O, from which we can identify potential stalagmite δ18O responses to climate variability. Comparison of the modelled and actual stalagmite δ18O for two stalagmites from the site demonstrates that, for the period of overlapping growth, the two series do not correlate with one another, but forward modelling demonstrates that this falls within the range explicable by differences in flow routing to the stalagmites. Pseudoproxy δ18O stalagmite series highlight the potential significance of peat hydrology in controlling stalagmite δ18O over the last 1000 yr at this site. © Author(s) 2012. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49570
Appears in Collections: 气候变化与战略
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Recommended Citation:
Baker A.,Bradley C.,Phipps S.J.,et al. Millennial-length forward models and pseudoproxies of stalagmite δ18O: An example from NW Scotland[J]. Climate of the Past,2012-01-01,8(4)