A global assessment of the mixed layer in coastal sediments and implications for carbon storage

Shasha Song, Isaac R. Santos, Huaming Yu, Faming Wang, William C. Burnett, Thomas S. Bianchi, Junyu Dong, Ergang Lian, Bin Zhao, Lawrence Mayer, Qingzhen Yao, Zhigang Yu and Bochao Xu ()
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Shasha Song: Ocean University of China
Isaac R. Santos: University of Gothenburg
Huaming Yu: Ocean University of China
Faming Wang: Chinese Academy of Sciences
William C. Burnett: Florida State University
Thomas S. Bianchi: University of Florida
Junyu Dong: Ocean University of China
Ergang Lian: Tongji University
Bin Zhao: Ocean University of China
Lawrence Mayer: University of Maine, Walpole
Qingzhen Yao: Ocean University of China
Zhigang Yu: Ocean University of China
Bochao Xu: Ocean University of China

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract The sediment-water interface in the coastal ocean is a highly dynamic zone controlling biogeochemical fluxes of greenhouse gases, nutrients, and metals. Processes in the sediment mixed layer (SML) control the transfer and reactivity of both particulate and dissolved matter in coastal interfaces. Here we map the global distribution of the coastal SML based on excess 210Pb (210Pbex) profiles and then use a neural network model to upscale these observations. We show that highly dynamic regions such as large estuaries have thicker SMLs than most oceanic sediments. Organic carbon preservation and SMLs are inversely related as mixing stimulates oxidation in sediments which enhances organic matter decomposition. Sites with SML thickness >60 cm usually have lower organic carbon accumulation rates (

Date: 2022
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DOI: 10.1038/s41467-022-32650-0

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