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

A global assessment of the mixed layer in coastal sediments and implications for carbon storage.
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沿海沉积物混合层的全球评估及其对碳储存的影响

DOI:
10.1038/s41467-022-32650-0
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发表时间:
2022-08-20
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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沿海海洋的沉积物-水界面是一个高度动态的区域,控制着温室气体、营养物质和金属的生物地球化学通量。沉积物混合层(SML)中的过程控制着海岸界面中颗粒和溶解物质的迁移和反应。在这里,我们根据过量的210Pb(210Pbex)剖面绘制沿海SML的全球分布图,然后使用神经网络模型来放大这些观测结果。我们发现,高动态区,如大河口,比大多数海洋沉积物具有更厚的SML。有机碳保存和SML是负相关的,因为混合促进了沉积物中的氧化,从而促进了有机质的分解。SML厚度为60 cm的地点通常具有较低的有机碳积累速率(<50 g Cm−2 yr−1)和总有机碳/比表面积比(<0.4 mg m−2)。我们在全球范围内的观察表明,重新加工可以加速有机物的降解,减少沿海沉积物中的碳储存。基于神经网络模型,作者绘制了沿海海洋沉积物混合层的全球分布图。这些观察表明,混合可以加速有机物的降解,减少沿海海洋的碳储存。
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. The authors map the global distribution of the mixed layer in coastal ocean sediments, based on a neural network model. These observations reveal that mixing can accelerate organic matter degradation and reduce carbon storage in the coastal ocean.
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发表时间: 2005-11-01
影响因子: 2.3
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发表时间: 2006-11-01
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