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Hydrology regulates sources and sinks of carbon dioxide and methane in a tropical headwater stream.

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Title: Hydrology regulates sources and sinks of carbon dioxide and methane in a tropical headwater stream.
Authors: Rexroade, Adam T.1 (AUTHOR) rexroade@cdu.edu.au, Wallin, Marcus B.2 (AUTHOR), Ulloa‐Cedamanos, Francesco1 (AUTHOR), Taillardat, Pierre3 (AUTHOR), Duvert, Clément1,4 (AUTHOR)
Source: Limnology & Oceanography. Apr2026, Vol. 71 Issue 4, p1-16. 16p.
Subjects: Hydrology, Carbon dioxide, Streamflow, Methane, River channels, Runoff analysis, Carbon cycle, Greenhouse gases
Geographic Terms: Australia
Abstract: Tropical headwater streams are potentially important sources of greenhouse gases, with seasonal shifts in flow regimes and hydrological connectivity likely influencing their sources and sinks of greenhouse gases. We developed a mass balance for carbon dioxide (CO2) and methane (CH4) over a year in a well‐instrumented headwater stream in the seasonal tropics of northern Australia, quantifying sources and sinks at daily (CO2) and monthly (CH4) timescales. Additionally, we relate changes in CO2 concentration and fluxes to changes in discharge to understand the drivers of CO2 fluxes in this system. The stream received 3.2 g C‐CO2 m−2 y−1 and 0.06 g C‐CH4 m−2 y−1 (standardized to the catchment area), mostly from surface runoff and shallow groundwater, with disproportional amounts (82% and 72%, respectively) imported during the 6‐month wet season. Less than 10% of CO2 was produced by internal aquatic metabolism, with the rest being imported from the surrounding terrestrial environment. Over 90% and 77% of the CO2 and CH4 received by the stream was emitted to the atmosphere, with emission rates two and 1.5 times higher than global river mean emission rates. CO2 import and emission to the atmosphere was positively correlated with discharge while CO2 concentration in the stream was negatively correlated. Collectively, these data demonstrate strong seasonal patterns of carbon sources and sinks driven by the extreme seasonal hydrological cycling. [ABSTRACT FROM AUTHOR]
Copyright of Limnology & Oceanography is the property of Wiley-Blackwell 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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  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 193279554
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Hydrology regulates sources and sinks of carbon dioxide and methane in a tropical headwater stream.
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  Data: <searchLink fieldCode="AR" term="%22Rexroade%2C+Adam+T%2E%22">Rexroade, Adam T.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> rexroade@cdu.edu.au</i><br /><searchLink fieldCode="AR" term="%22Wallin%2C+Marcus+B%2E%22">Wallin, Marcus B.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ulloa‐Cedamanos%2C+Francesco%22">Ulloa‐Cedamanos, Francesco</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Taillardat%2C+Pierre%22">Taillardat, Pierre</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Duvert%2C+Clément%22">Duvert, Clément</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Limnology+%26+Oceanography%22">Limnology & Oceanography</searchLink>. Apr2026, Vol. 71 Issue 4, p1-16. 16p.
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  Data: <searchLink fieldCode="DE" term="%22Hydrology%22">Hydrology</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+dioxide%22">Carbon dioxide</searchLink><br /><searchLink fieldCode="DE" term="%22Streamflow%22">Streamflow</searchLink><br /><searchLink fieldCode="DE" term="%22Methane%22">Methane</searchLink><br /><searchLink fieldCode="DE" term="%22River+channels%22">River channels</searchLink><br /><searchLink fieldCode="DE" term="%22Runoff+analysis%22">Runoff analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+cycle%22">Carbon cycle</searchLink><br /><searchLink fieldCode="DE" term="%22Greenhouse+gases%22">Greenhouse gases</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Australia%22">Australia</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Tropical headwater streams are potentially important sources of greenhouse gases, with seasonal shifts in flow regimes and hydrological connectivity likely influencing their sources and sinks of greenhouse gases. We developed a mass balance for carbon dioxide (CO2) and methane (CH4) over a year in a well‐instrumented headwater stream in the seasonal tropics of northern Australia, quantifying sources and sinks at daily (CO2) and monthly (CH4) timescales. Additionally, we relate changes in CO2 concentration and fluxes to changes in discharge to understand the drivers of CO2 fluxes in this system. The stream received 3.2 g C‐CO2 m−2 y−1 and 0.06 g C‐CH4 m−2 y−1 (standardized to the catchment area), mostly from surface runoff and shallow groundwater, with disproportional amounts (82% and 72%, respectively) imported during the 6‐month wet season. Less than 10% of CO2 was produced by internal aquatic metabolism, with the rest being imported from the surrounding terrestrial environment. Over 90% and 77% of the CO2 and CH4 received by the stream was emitted to the atmosphere, with emission rates two and 1.5 times higher than global river mean emission rates. CO2 import and emission to the atmosphere was positively correlated with discharge while CO2 concentration in the stream was negatively correlated. Collectively, these data demonstrate strong seasonal patterns of carbon sources and sinks driven by the extreme seasonal hydrological cycling. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Limnology & Oceanography is the property of Wiley-Blackwell 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:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1002/lno.70372
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 16
        StartPage: 1
    Subjects:
      – SubjectFull: Hydrology
        Type: general
      – SubjectFull: Carbon dioxide
        Type: general
      – SubjectFull: Streamflow
        Type: general
      – SubjectFull: Methane
        Type: general
      – SubjectFull: River channels
        Type: general
      – SubjectFull: Runoff analysis
        Type: general
      – SubjectFull: Carbon cycle
        Type: general
      – SubjectFull: Greenhouse gases
        Type: general
      – SubjectFull: Australia
        Type: general
    Titles:
      – TitleFull: Hydrology regulates sources and sinks of carbon dioxide and methane in a tropical headwater stream.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Rexroade, Adam T.
      – PersonEntity:
          Name:
            NameFull: Wallin, Marcus B.
      – PersonEntity:
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            NameFull: Ulloa‐Cedamanos, Francesco
      – PersonEntity:
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            NameFull: Taillardat, Pierre
      – PersonEntity:
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            NameFull: Duvert, Clément
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          Dates:
            – D: 01
              M: 04
              Text: Apr2026
              Type: published
              Y: 2026
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              Value: 00243590
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              Value: 71
            – Type: issue
              Value: 4
          Titles:
            – TitleFull: Limnology & Oceanography
              Type: main
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