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Global distribution of nonexchangeable stable hydrogen isotope ratios of topsoil clay fractions.

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Title: Global distribution of nonexchangeable stable hydrogen isotope ratios of topsoil clay fractions.
Authors: Merseburger, Stefan1 (AUTHOR), Kessler, Arnim2 (AUTHOR), Ojoatre, Sadadi3 (AUTHOR), Berthold, Christoph4 (AUTHOR), Oelmann, Yvonne2 (AUTHOR), Wilcke, Wolfgang1 (AUTHOR) wolfgang.wilcke@kit.edu
Source: Geochimica et Cosmochimica Acta. Apr2023, Vol. 347, p72-87. 16p.
Subjects: Hydrogen isotopes, Topsoil, Clay soils, Clay, Mineral waters, Clay minerals, Stable isotopes
Geographic Terms: Kenya
Abstract: Stable isotope ratios of hydrogen (δ2H values) in local meteoric water correlate with those of nonexchangeable H (δ2H n) in bulk soil and organic matter, allowing for probabilistic spatial assignments to soil samples. We hypothesized that there is a similar correlation between the δ2H values of local meteoric water and the δ2H n value of soil clay fractions. The H pool of topsoil clay fractions is usually dominated by pedogenic clay minerals, which contain structural hydroxyl-H, preserving the δ2H values of ambient water at the time mineral formation. We applied a steam equilibration method with water vapors of known δ2H values to determine δ2H n values in soil clay fractions by eliminating the influence of easily exchangeable H. We collected topsoil samples from 24 locations on five continents with a wide variation in δ2H values of meteoric water. To calculate δ2H n values via steam equilibration, the equilibrium fractionation factor between exchangeable H in the clay fractions and equilibration waters (α ex–w) is needed, which is, however, unknown. We therefore assessed the effect of α ex-w values from 1 (no fractionation) to α ex-w = 1.08, which has been used in steam equilibration approaches of organic matter and bulk soil, on the δ2H n values of soil clay fractions. The δ2H n values of the clay fractions ranged from –167 ± SD1‰ for a northern Siberian sample to –44 ± 4‰ in western Kenya for α ex-w = 1 and from −191 ± 5 to –81 ± 5‰ for α ex-w = 1.08. The δ2H values of local meteoric water correlated significantly with the δ2H n values of the clay fractions (r = 0.85 for α ex-w = 1 and 0.65 for α ex-w = 1.08, p < 0.001). A multiple regression model including hillslope as a possible measure of the accumulation of clay minerals with a slightly different δ2H n value from nearby locations by eolian or aqueous transport in addition to the mean seasonal δ2H values of local meteoric water explained up to 89% of the observed variation in δ2H values of the clay fractions. Our results demonstrate that the δ2H n values of soil clay fractions are driven by the δ2H values of local precipitation on a global scale, irrespective of the used α ex–w value and influenced by the mineral type. Overcoming previous methodological limitations opens up opportunities for probabilistic spatial assignments of unknown organic matter-poor topsoil samples, applications to paleosoil problems or to experimentally track clay mineral neoformation in soils by tracer experiments. [ABSTRACT FROM AUTHOR]
Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Global distribution of nonexchangeable stable hydrogen isotope ratios of topsoil clay fractions.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Merseburger%2C+Stefan%22&quot;&gt;Merseburger, Stefan&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Kessler%2C+Arnim%22&quot;&gt;Kessler, Arnim&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Ojoatre%2C+Sadadi%22&quot;&gt;Ojoatre, Sadadi&lt;/searchLink&gt;&lt;relatesTo&gt;3&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Berthold%2C+Christoph%22&quot;&gt;Berthold, Christoph&lt;/searchLink&gt;&lt;relatesTo&gt;4&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Oelmann%2C+Yvonne%22&quot;&gt;Oelmann, Yvonne&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Wilcke%2C+Wolfgang%22&quot;&gt;Wilcke, Wolfgang&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; wolfgang.wilcke@kit.edu&lt;/i&gt;
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– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Stable isotope ratios of hydrogen (δ2H values) in local meteoric water correlate with those of nonexchangeable H (δ2H n) in bulk soil and organic matter, allowing for probabilistic spatial assignments to soil samples. We hypothesized that there is a similar correlation between the δ2H values of local meteoric water and the δ2H n value of soil clay fractions. The H pool of topsoil clay fractions is usually dominated by pedogenic clay minerals, which contain structural hydroxyl-H, preserving the δ2H values of ambient water at the time mineral formation. We applied a steam equilibration method with water vapors of known δ2H values to determine δ2H n values in soil clay fractions by eliminating the influence of easily exchangeable H. We collected topsoil samples from 24 locations on five continents with a wide variation in δ2H values of meteoric water. To calculate δ2H n values via steam equilibration, the equilibrium fractionation factor between exchangeable H in the clay fractions and equilibration waters (α ex–w) is needed, which is, however, unknown. We therefore assessed the effect of α ex-w values from 1 (no fractionation) to α ex-w = 1.08, which has been used in steam equilibration approaches of organic matter and bulk soil, on the δ2H n values of soil clay fractions. The δ2H n values of the clay fractions ranged from –167 &#177; SD1‰ for a northern Siberian sample to –44 &#177; 4‰ in western Kenya for α ex-w = 1 and from −191 &#177; 5 to –81 &#177; 5‰ for α ex-w = 1.08. The δ2H values of local meteoric water correlated significantly with the δ2H n values of the clay fractions (r = 0.85 for α ex-w = 1 and 0.65 for α ex-w = 1.08, p &lt; 0.001). A multiple regression model including hillslope as a possible measure of the accumulation of clay minerals with a slightly different δ2H n value from nearby locations by eolian or aqueous transport in addition to the mean seasonal δ2H values of local meteoric water explained up to 89% of the observed variation in δ2H values of the clay fractions. Our results demonstrate that the δ2H n values of soil clay fractions are driven by the δ2H values of local precipitation on a global scale, irrespective of the used α ex–w value and influenced by the mineral type. Overcoming previous methodological limitations opens up opportunities for probabilistic spatial assignments of unknown organic matter-poor topsoil samples, applications to paleosoil problems or to experimentally track clay mineral neoformation in soils by tracer experiments. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: &lt;i&gt;Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.gca.2023.02.007
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 16
        StartPage: 72
    Subjects:
      – SubjectFull: Hydrogen isotopes
        Type: general
      – SubjectFull: Topsoil
        Type: general
      – SubjectFull: Clay soils
        Type: general
      – SubjectFull: Clay
        Type: general
      – SubjectFull: Mineral waters
        Type: general
      – SubjectFull: Clay minerals
        Type: general
      – SubjectFull: Stable isotopes
        Type: general
      – SubjectFull: Kenya
        Type: general
    Titles:
      – TitleFull: Global distribution of nonexchangeable stable hydrogen isotope ratios of topsoil clay fractions.
        Type: main
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            NameFull: Merseburger, Stefan
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            NameFull: Kessler, Arnim
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            NameFull: Ojoatre, Sadadi
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            NameFull: Berthold, Christoph
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            NameFull: Oelmann, Yvonne
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            NameFull: Wilcke, Wolfgang
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            – D: 15
              M: 04
              Text: Apr2023
              Type: published
              Y: 2023
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              Value: 347
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