Transfer efficiency of organic carbon in marine sediments.

Transfer efficiency of organic carbon in marine sediments.
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DOI:
10.1038/s41467-022-35112-9
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发表时间:
2022-11-26
影响因子:
16.6
通讯作者:
Arndt, Sandra
Arndt, Sandra
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Bradley, James A.;Hulse, Dominik;LaRowe, Douglas E.;Arndt, Sandra

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量化海洋沉积物中的有机碳汇对于评估海洋碳循环如何调节地球气候至关重要。然而,埋藏效率(BE)——一种常用的度量标准,报告海底沉积的有机碳被掩埋的百分比(超出任意且通常未指定的参考深度)——定义松散,具有误导性,而且不一致。在这里,我们使用一个全球成岩模型来强调在固定海底深度的沉积物年龄的数量级差异(反之亦然),以及根据用于计算BE的沉积物深度或年龄层而产生的巨大差异。我们建议使用传递效率(Teff’s)来量化沉积物的OC埋藏:Teff在数值上相当于BE,但需要精确的空间或时间参考规范,并强调OC降解在这些范围之外继续进行。最终,用精确的沉积深度和沉积年龄确定的度量来量化有机碳埋藏,将使通过地球系统对有机碳通量的评估更加一致和可转移。海洋沉积物中有机碳的埋藏调节着地球的碳循环和气候。在这里,作者提出了“转移效率”作为量化海洋有机碳循环沉积部分的新框架。
Quantifying the organic carbon (OC) sink in marine sediments is crucial for assessing how the marine carbon cycle regulates Earth’s climate. However, burial efficiency (BE) – the commonly-used metric reporting the percentage of OC deposited on the seafloor that becomes buried (beyond an arbitrary and often unspecified reference depth) – is loosely defined, misleading, and inconsistent. Here, we use a global diagenetic model to highlight orders-of-magnitude differences in sediment ages at fixed sub-seafloor depths (and vice-versa), and vastly different BE’s depending on sediment depth or age horizons used to calculate BE. We propose using transfer efficiencies (Teff’s) for quantifying sediment OC burial: Teff is numerically equivalent to BE but requires precise specification of spatial or temporal references, and emphasizes that OC degradation continues beyond these horizons. Ultimately, quantifying OC burial with precise sediment-depth and sediment-age-resolved metrics will enable a more consistent and transferable assessment of OC fluxes through the Earth system. The burial of organic carbon in marine sediments regulates Earth’s carbon cycle and climate. Here, authors present ‘transfer efficiencies’ as a new framework for quantifying the sedimentary portion of the marine organic carbon cycle.
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