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    iceTEA: Tools for plotting and analysing cosmogenic-nuclide surface-exposure data from former ice margins


    Jones, R.S. and Small, D. and Cahill, Niamh and Bentley, M.J. and Whitehouse, P.L. (2019) iceTEA: Tools for plotting and analysing cosmogenic-nuclide surface-exposure data from former ice margins. Quaternary Geochronology, 51. pp. 72-86. ISSN 1871-1014

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    Abstract

    Cosmogenic-nuclide surface-exposure data provide important constraints on the thickness, extent and behaviour of ice masses in the geological past. A number of online calculators provide the cosmogenic nuclide community with a means of easily calculating surface-exposure ages. Here we provide a platform for plotting and analysing such data. This paper describes a suite of freely accessible numerical tools for visualising, evaluating and correcting surface-exposure data that are used to reconstruct past glacier and ice sheet geometries. iceTEA (Tools for Exposure Ages) is available as an online interface (http://ice-tea.org) and as MATLAB© code. There are 8 tools, which provide the following functionality: 1) calculate exposure ages from 10Be and 26Al data, 2) plot exposure ages as kernel density estimates and as a horizontal or vertical transect, 3) identify and remove outliers within a dataset, 4) plot nuclide concentrations on a two-isotope diagram and as a function of depth, 5) correct exposure ages for cover of the rock surface, 6) correct ages for changes in relative elevation through time, and estimate 7) average and 8) continuous rates of ice margin retreat or thinning. Three of the tools (1, 5 and 6) perform exposure age calculations, which are based on the framework of CRONUScalc. Results are available as printed text, tables and/or raster (.png) and vector (.eps) graphics files, depending on the tool. These tools are intended to enable users to evaluate complex exposure histories, assess the reliability of exposure ages, explore potential age corrections, and better analyse and understand spatial and temporal patterns within their data.

    Item Type: Article
    Additional Information: Cite as: R.S. Jones, D. Small, N. Cahill, M.J. Bentley, P.L. Whitehouse, iceTEA: Tools for plotting and analysing cosmogenic-nuclide surface-exposure data from former ice margins, Quaternary Geochronology, Volume 51, 2019, Pages 72-86, ISSN 1871-1014, https://doi.org/10.1016/j.quageo.2019.01.001
    Keywords: Glaciers and ice sheets; Be-10 and Al-26; TCN dating; Outlier test; GIA; Retreat and thinning rates;
    Academic Unit: Faculty of Science and Engineering > Mathematics and Statistics
    Item ID: 13628
    Identification Number: https://doi.org/10.1016/j.quageo.2019.01.001
    Depositing User: Niamh Cahill
    Date Deposited: 24 Nov 2020 16:01
    Journal or Publication Title: Quaternary Geochronology
    Publisher: Elsevier
    Refereed: Yes
    URI:

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