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Variations in mid-ocean ridge CO2 emissions driven by glacial cycles.

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Title: Variations in mid-ocean ridge CO2 emissions driven by glacial cycles.
Authors: Burley, Jonathan M.A.1 jonathan.burley@earth.ox.ac.uk, Katz, Richard F.1
Source: Earth & Planetary Science Letters. Sep2015, Vol. 426, p246-258. 13p.
Subjects: Mid-ocean ridges, Carbon dioxide, Glaciation, Earth's mantle, Geochemistry, Volcanism
Abstract: The geological record documents links between glacial cycles and volcanic productivity, both subaerially and, tentatively, at mid-ocean ridges. Sea-level-driven pressure changes could also affect chemical properties of mid-ocean ridge volcanism. We consider how changing sea-level could alter the CO 2 emissions rate from mid-ocean ridges on both the segment and global scale. We develop a simplified transport model for a highly incompatible trace element moving through a homogeneous mantle; variations in the concentration and the emission rate of the element are the result of changes in the depth of first silicate melting. The model predicts an average global mid-ocean ridge CO 2 emissions rate of 53 Mt/yr or 91 Mt/yr for an average source mantle CO 2 concentration of 125 or 215 ppm by weight, in line with other estimates. We show that falling sea level would cause an increase in ridge CO 2 emissions about 100 kyrs after the causative sea level change. The lag and amplitude of the response are sensitive to mantle permeability and plate spreading rate. For a reconstructed sea-level time series of the past million years, we predict variations of up to 12 % in global mid-ocean ridge CO 2 emissions. [ABSTRACT FROM AUTHOR]
Copyright of Earth & Planetary Science Letters is the property of Elsevier B.V. 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: Variations in mid-ocean ridge CO2 emissions driven by glacial cycles.
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  Data: <searchLink fieldCode="JN" term="%22Earth+%26+Planetary+Science+Letters%22">Earth & Planetary Science Letters</searchLink>. Sep2015, Vol. 426, p246-258. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Mid-ocean+ridges%22">Mid-ocean ridges</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+dioxide%22">Carbon dioxide</searchLink><br /><searchLink fieldCode="DE" term="%22Glaciation%22">Glaciation</searchLink><br /><searchLink fieldCode="DE" term="%22Earth's+mantle%22">Earth's mantle</searchLink><br /><searchLink fieldCode="DE" term="%22Geochemistry%22">Geochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Volcanism%22">Volcanism</searchLink>
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  Data: The geological record documents links between glacial cycles and volcanic productivity, both subaerially and, tentatively, at mid-ocean ridges. Sea-level-driven pressure changes could also affect chemical properties of mid-ocean ridge volcanism. We consider how changing sea-level could alter the CO 2 emissions rate from mid-ocean ridges on both the segment and global scale. We develop a simplified transport model for a highly incompatible trace element moving through a homogeneous mantle; variations in the concentration and the emission rate of the element are the result of changes in the depth of first silicate melting. The model predicts an average global mid-ocean ridge CO 2 emissions rate of 53 Mt/yr or 91 Mt/yr for an average source mantle CO 2 concentration of 125 or 215 ppm by weight, in line with other estimates. We show that falling sea level would cause an increase in ridge CO 2 emissions about 100 kyrs after the causative sea level change. The lag and amplitude of the response are sensitive to mantle permeability and plate spreading rate. For a reconstructed sea-level time series of the past million years, we predict variations of up to 12 % in global mid-ocean ridge CO 2 emissions. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Earth & Planetary Science Letters is the property of Elsevier B.V. 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.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.epsl.2015.06.031
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      – Code: eng
        Text: English
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        PageCount: 13
        StartPage: 246
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      – SubjectFull: Mid-ocean ridges
        Type: general
      – SubjectFull: Carbon dioxide
        Type: general
      – SubjectFull: Glaciation
        Type: general
      – SubjectFull: Earth's mantle
        Type: general
      – SubjectFull: Geochemistry
        Type: general
      – SubjectFull: Volcanism
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              Text: Sep2015
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