Reassessment of recommendations for processing mammal phosphate δ18O data for paleotemperature reconstruction

Greg Skrzypek, Rohan Sadler, A. Wiśniewski

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    Abstract

    © 2016 Elsevier B.V. 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.
    Original languageEnglish
    Pages (from-to)162-167
    Number of pages6
    JournalPalaeogeography, Palaeoclimatology, Palaeoecology
    Volume446
    Early online date21 Jan 2016
    DOIs
    Publication statusPublished - 15 Mar 2016

    Fingerprint

    paleotemperature
    mammal
    phosphate
    mammals
    phosphates
    isotopes
    stable isotope
    oxygen isotope
    uncertainty
    oxygen
    biogeochemistry
    least squares method
    carbonates
    stable isotopes
    tooth
    least squares
    bone
    air temperature
    teeth
    vertebrate

    Cite this

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    abstract = "{\circledC} 2016 Elsevier B.V. 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.",
    author = "Greg Skrzypek and Rohan Sadler and A. Wiśniewski",
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    Reassessment of recommendations for processing mammal phosphate δ18O data for paleotemperature reconstruction. / Skrzypek, Greg; Sadler, Rohan; Wiśniewski, A.

    In: Palaeogeography, Palaeoclimatology, Palaeoecology, Vol. 446, 15.03.2016, p. 162-167.

    Research output: Contribution to journalArticle

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    AU - Sadler, Rohan

    AU - Wiśniewski, A.

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