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<p>Land-to-water hydrological connections represent a key regulatory mechanism of carbon transport, controlling carbon dioxide (CO<sub>2</sub>) emissions from lakes; however, as of yet, there is no assessment of its role at a pan-Arctic scale across large climatic and topographical gradients. We hypothesized that hydrologically well-connected lakes in wetter regions are CO<sub>2</sub> sources fueled by stronger lateral fluxes of external carbon relative to drier regions. However, based on data from &gt;200 Arctic lakes, we found that lakes in drier regions have higher and more variable annual CO<sub>2</sub> emissions (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({37.0}_{6.2}^{146.0}\)</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mrow> <mn>37.0</mn> </mrow> <mrow> <mn>6.2</mn> </mrow> <mrow> <mn>146.0</mn> </mrow> </msubsup> </math></EquationSource> </InlineEquation> gC m<sup>-2</sup> yr<sup>-1</sup>, <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({{median}}_{Q1}^{Q3}\)</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mrow> <mi>m</mi> <mi>e</mi> <mi>d</mi> <mi>i</mi> <mi>a</mi> <mi>n</mi> </mrow> <mrow> <mi>Q</mi> <mn>1</mn> </mrow> <mrow> <mi>Q</mi> <mn>3</mn> </mrow> </msubsup> </math></EquationSource> </InlineEquation>) compared to lakes in wetter regions (<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({8.0}_{1.7}^{17.3}\)</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mrow> <mn>8.0</mn> </mrow> <mrow> <mn>1.7</mn> </mrow> <mrow> <mn>17.3</mn> </mrow> </msubsup> </math></EquationSource> </InlineEquation> gC m<sup>-2</sup> yr<sup>-1</sup>), with both the lowest and the highest fluxes recorded among dryland lakes. We hypothesize that with increasing wetness, the relative proportion of fluvial emissions increases, whereas in drier landscapes where lakes often have limited stream export, carbon inputs can be retained and more efficiently emitted from lakes.</p>

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Higher, but more variable, annual CO2 emissions from lakes in drier Arctic landscapes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月7日

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  • Václava Hazuková,
  • Fredrik Alriksson,
  • Cristian Gudasz,
  • Jan Karlsson,
  • Chunlin Song,
  • Matthew J. Bogard,
  • David E. Butman,
  • Joshua F. Dean,
  • Anders Jonsson,
  • Erik Lundin,
  • Suzanne E. Tank,
  • Jasmine E. Saros

摘要

Land-to-water hydrological connections represent a key regulatory mechanism of carbon transport, controlling carbon dioxide (CO2) emissions from lakes; however, as of yet, there is no assessment of its role at a pan-Arctic scale across large climatic and topographical gradients. We hypothesized that hydrologically well-connected lakes in wetter regions are CO2 sources fueled by stronger lateral fluxes of external carbon relative to drier regions. However, based on data from >200 Arctic lakes, we found that lakes in drier regions have higher and more variable annual CO2 emissions ( \({37.0}_{6.2}^{146.0}\) 37.0 6.2 146.0 gC m-2 yr-1, \({{median}}_{Q1}^{Q3}\) m e d i a n Q 1 Q 3 ) compared to lakes in wetter regions ( \({8.0}_{1.7}^{17.3}\) 8.0 1.7 17.3 gC m-2 yr-1), with both the lowest and the highest fluxes recorded among dryland lakes. We hypothesize that with increasing wetness, the relative proportion of fluvial emissions increases, whereas in drier landscapes where lakes often have limited stream export, carbon inputs can be retained and more efficiently emitted from lakes.