Terrestrial organic carbon (OC) plays an important role in the carbon cycle, but questions remain regarding the controls and timescale(s) over which atmospheric CO₂ remains sequestered as particulate OC (POC). Motivated by observations that terrestrial POC is physically stored within soils and other shallow sedimentary deposits, we examined the role that sediment storage plays in the terrestrial OC cycle. Specifically, we tested the hypothesis that sediment storage impacts the age of terrestrial POC. We focused on the Efri Haukadalsá River catchment in Iceland as it lacks ancient sedimentary bedrock that would otherwise bias radiocarbon‐based determinations of POC storage duration by supplying pre‐aged “petrogenic” POC.

中文翻译：

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河流有机碳的长期储存和按年限出口：来自西冰岛的实地证据

陆地有机碳（OC）在碳循环中起着重要作用，但是对于大气中的CO ₂保持隔离为颗粒OC（POC）的控制和时间尺度仍然存在疑问。根据观察结果，陆上POC物理存储在土壤和其他浅层沉积物中，我们考察了沉积物在陆地OC循环中的作用。具体来说，我们测试了沉积物存储影响地面POC年龄的假设。我们重点关注冰岛的EfriHaukadalsá河流域，因为它缺乏古老的沉积基岩，否则将通过提供年代久远的“成岩” POC来偏重基于放射性碳的POC储存时间的确定。