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A global assessment of the mixed layer in coastal sediments and implications for carbon storage1.61 MB
Published (Version of record)CC BY V4.0, Open Access
Published (Version of record)CC BY V4.0, Open
Journal article
A global assessment of the mixed layer in coastal sediments and implications for carbon storage
Nature communications, Vol.13, pp.1-10
20/08/2022
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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 (<50 g C m−2 yr−1) and total organic carbon/specific surface area ratios (<0.4 mg m−2). Our global scale observations reveal that reworking can accelerate organic matter degradation and reduce carbon storage in coastal sediments.
Details
- Title
- A global assessment of the mixed layer in coastal sediments and implications for carbon storage
- Creators
- Shasha Song - Ocean University of ChinaIsaac R SantosHuaming YuFaming WangWilliam C BurnettThomas S BianchiJunyu DongErgang LianBin ZhaoLawrence MayerQingzhen YaoZhigang YuBochao Xu
- Publication Details
- Nature communications, Vol.13, pp.1-10
- Publisher
- Nature Publishing Group
- Grant note
- This work was supported by Natural Science Foundation of China (NSFC grant 42130410 to Z.Y., 41876075 to B.X., and U1906210 to Q.Y.).
- Identifiers
- 991013054811102368
- Copyright
- Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. © The Author(s) 2022
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article