DOI: 10.1016/j.palaeo.2016.01.032
论文题名: Reassessment of recommendations for processing mammal phosphate δ18O data for paleotemperature reconstruction
作者: Skrzypek G. ; Sadler R. ; Wiśniewski A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 446 起始页码: 162
结束页码: 167
语种: 英语
英文关键词: Calibration
; Oxygen
; Paleotemperature
; Phosphate
; Stable isotope
; Teeth
英文摘要: The stable oxygen isotope composition of phosphates (δ18OP) extracted from vertebrate bone and teeth material is widely used for paleotemperature reconstruction over the Quaternary period. However, inconsistency in analytical and statistical procedures used by different researchers for recalculation of mean air temperatures from measured δ18OP values makes integration of different data sets challenging. Therefore, consistency in both stable isotope data processing and the application of appropriate statistical procedures is highly desirable. This paper evaluates the uncertainty associated with two most commonly used regression methods, least-squares inverted fit and transposed fit. We assessed the performance of both fits by designing 'real-life' experiments using various data sets. We used both regression models to reversely calculate the differences between actual recorded in 'real-life' values and values calculated from the regression models. Our calculations clearly show that the mean absolute errors are always substantially higher for the inverted fit and the transposed fit always returned mean values closer to the values measured in 'real life.' In all studied scenarios, the predictive models performed better than causal models, returning mean absolute errors by 12-65% lower. In the paper, we also examined the other main sources of uncertainty, concerns about calculation of δ18OP of phosphates from δ18OC of carbonates, averaging of δ18OW in precipitation and highlight major challenges in the field of phosphate stable oxygen isotope biogeochemistry. The estimation of paleotemperatures from isotope records could be improved by employing globally consistent calculation procedures. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68550
Appears in Collections: 过去全球变化的重建
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作者单位: West Australian Biogeochemistry Centre, School of Plant Biology M090, The University of Western Australia, 35 Stirling Highway, Crawley, WA, Australia; Bush Futures, 4 James Street, Guildford, WA, Australia; School of Agricultural and Resource Economics M089, The University of Western Australia, 35 Stirling Highway, Crawley, WA, Australia; Institute of Archaeology, The University of Wrocław, Szewska Str. 48, Wrocław, Poland
Recommended Citation:
Skrzypek G.,Sadler R.,Wiśniewski A.. Reassessment of recommendations for processing mammal phosphate δ18O data for paleotemperature reconstruction[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,446