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The hidden buffering: How carbonate geology and sediments suppress CO2 emissions from reservoirs.

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Title: The hidden buffering: How carbonate geology and sediments suppress CO2 emissions from reservoirs.
Authors: Hu, Xuan1 (AUTHOR), Wang, Wanfa1 (AUTHOR) wfwang@gzu.edu.cn, Lu, Xixi2 (AUTHOR), Qi, Hongkai3 (AUTHOR), Kumar, Amit4 (AUTHOR), He, Dengming1 (AUTHOR), Tu, Shijun1 (AUTHOR), Bao, Yufei5 (AUTHOR), Zeng, Jie1 (AUTHOR), Wu, Qixin1 (AUTHOR), Xia, Hao6 (AUTHOR), Wang, Yuchun5 (AUTHOR), Li, Si-Liang7 (AUTHOR)
Source: Journal of Hydrology. Aug2026, Vol. 675, pN.PAG-N.PAG. 1p.
Subjects: Sediments, Geology, Carbon emissions, Buffer solutions, Carbon cycle, Lakes
Abstract: • Carbonate buffering suppresses CO 2 production and emissions in cascade reservoirs. • High suspended sediment concentrations amplify carbonate buffering in plateau reservoirs. • Carbonate-dominated reservoirs with high suspended sediment reduce CO 2 emissions globally. • Incorporating geological and sedimentary contexts improves reservoir carbon budget estimates. Research on carbon cycling in Qinghai–Tibet Plateau rivers has attracted considerable attention. However, the role of carbonate buffering in regulating carbon dioxide (CO 2) dynamics within cascade reservoirs remains poorly understood, particularly in plateau regions characterized by carbonate-rich geology and high suspended sediment concentration (SSC). In carbonate-enriched sediments, carbonate buffering prolongs the equilibration timescales of both partial pressure of CO 2 (p CO 2) and stable isotopic composition of dissolved inorganic carbon (δ13C DIC) with the atmosphere by ∼10-fold and ∼100-fold, respectively, compared to non-buffered scenarios. Over extended timescales, water-carbonate interactions effectively limit the evasion of metabolically produced CO 2 in cascade reservoirs of the Lancang River, reducing CO 2 emissions flux (F CO2) by 24.4%. This buffering effect is particularly pronounced in the hypolimnion, where increased carbonate dissolution occurs, and remains sustained in the outflows. Globally, carbonate-dominated reservoirs with high SSC exhibit 82% lower F CO2 than those with low SSC, demonstrating that suspended sediments critically amplify carbonate buffering's suppression of CO 2 emissions. These findings highlight the necessity of incorporating coupled geological and sedimentary processes into global carbon budgets and climate assessments, particularly in high-altitude regions. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Hydrology 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.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 194046780
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: The hidden buffering: How carbonate geology and sediments suppress CO2 emissions from reservoirs.
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  Data: <searchLink fieldCode="AR" term="%22Hu%2C+Xuan%22">Hu, Xuan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Wanfa%22">Wang, Wanfa</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> wfwang@gzu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Lu%2C+Xixi%22">Lu, Xixi</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Qi%2C+Hongkai%22">Qi, Hongkai</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kumar%2C+Amit%22">Kumar, Amit</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22He%2C+Dengming%22">He, Dengming</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tu%2C+Shijun%22">Tu, Shijun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bao%2C+Yufei%22">Bao, Yufei</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zeng%2C+Jie%22">Zeng, Jie</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wu%2C+Qixin%22">Wu, Qixin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xia%2C+Hao%22">Xia, Hao</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Yuchun%22">Wang, Yuchun</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Si-Liang%22">Li, Si-Liang</searchLink><relatesTo>7</relatesTo> (AUTHOR)
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– Name: Abstract
  Label: Abstract
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  Data: • Carbonate buffering suppresses CO 2 production and emissions in cascade reservoirs. • High suspended sediment concentrations amplify carbonate buffering in plateau reservoirs. • Carbonate-dominated reservoirs with high suspended sediment reduce CO 2 emissions globally. • Incorporating geological and sedimentary contexts improves reservoir carbon budget estimates. Research on carbon cycling in Qinghai–Tibet Plateau rivers has attracted considerable attention. However, the role of carbonate buffering in regulating carbon dioxide (CO 2) dynamics within cascade reservoirs remains poorly understood, particularly in plateau regions characterized by carbonate-rich geology and high suspended sediment concentration (SSC). In carbonate-enriched sediments, carbonate buffering prolongs the equilibration timescales of both partial pressure of CO 2 (p CO 2) and stable isotopic composition of dissolved inorganic carbon (δ13C DIC) with the atmosphere by ∼10-fold and ∼100-fold, respectively, compared to non-buffered scenarios. Over extended timescales, water-carbonate interactions effectively limit the evasion of metabolically produced CO 2 in cascade reservoirs of the Lancang River, reducing CO 2 emissions flux (F CO2) by 24.4%. This buffering effect is particularly pronounced in the hypolimnion, where increased carbonate dissolution occurs, and remains sustained in the outflows. Globally, carbonate-dominated reservoirs with high SSC exhibit 82% lower F CO2 than those with low SSC, demonstrating that suspended sediments critically amplify carbonate buffering's suppression of CO 2 emissions. These findings highlight the necessity of incorporating coupled geological and sedimentary processes into global carbon budgets and climate assessments, particularly in high-altitude regions. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Journal of Hydrology 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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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.jhydrol.2026.135646
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      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Sediments
        Type: general
      – SubjectFull: Geology
        Type: general
      – SubjectFull: Carbon emissions
        Type: general
      – SubjectFull: Buffer solutions
        Type: general
      – SubjectFull: Carbon cycle
        Type: general
      – SubjectFull: Lakes
        Type: general
    Titles:
      – TitleFull: The hidden buffering: How carbonate geology and sediments suppress CO2 emissions from reservoirs.
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            NameFull: Hu, Xuan
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            – D: 01
              M: 08
              Text: Aug2026
              Type: published
              Y: 2026
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