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  • Presentation | H31L: Advancing Critical Zone Science Across Sites, Scales, and Disturbances Scales and Disturbances I Poster
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  • H31L-1223: Contrasting Patterns of Redox and Oxygen Dynamics at Terrestrial-Aquatic Interfaces
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  • Board 1223‚ Hall EFG (Poster Hall)
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Author(s):
Fausto Machado Silva, University of Toledo (First Author, Presenting Author)
Roberta Bittencourt Peixoto, University of Toledo
Michael Weintraub, University of Toledo
Nicholas Ward, Pacific Northwest National Laboratory
Peter Regier, Pacific Northwest National Laboratory
Patrick Megonigal, Smithsonian Environmental Research Center
Stephanie Wilson, Smithsonian Environmental Research Center
Ben Bond-Lamberty, Pacific Northwest National Laboratory
Stephanie Pennington, Pacific Northwest National Laboratory
Roy Rich, Smithsonian Environmental Research Center
Edward O'Loughlin, Argonne National Laboratory, Biosciences Division
Ken Kemner, Argonne National Laboratory
Kennedy Doro, University of Toledo
Shan Pushpajom Thomas, University of Toledo
Evan Phillips, Smithsonian Environmental Research Center
Evangelos Grammenidis, University of Toledo
Kaizad Patel, Pacific Northwest National Laboratory
Kenton Rod, Pacific Northwest National Laboratory
Teri O'Meara, Oak Ridge National Laboratory
Benjamin Sulman, Oak Ridge National Laboratory
Etienne Fluet-Chouinard, Pacific Northwest National Laboratory
Inke Forbrich, University of Toledo
Vanessa Bailey, Pacific Northwest National Laboratory


We typically expect redox potential and oxygen levels to rise and fall together because oxygen is a strong oxidizing agent. But in natural environments, their relationship is often more complex and doesn't follow a simple pattern. To better understand this, we studied coastal and shallow freshwater systems where biological and chemical activity is high. We found that redox and oxygen levels often move in opposite directions, especially during daily light-dark cycles. Surprisingly, redox levels peaked at night, when oxygen, pH, and temperature were at their lowest. These results demonstrate that biological processes like photosynthesis and respiration strongly influence redox conditions, and current biogeochemical models may need to be updated to reflect these complex dynamics.



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