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实质性但尚未计算的碳沉降:微生物衍生的黑碳在冷沉积物中的冷沉降

Xi Xiao^1,2, Qian-Yong Liang^1,2, Yuan-Ming Zhao³

¹National Engineering Research Center of Gas Hydrate Exploration and Development, Guangzhou 511458, China.

Environmental science & technology

|March 11, 2026

概括

一个新的海洋黑碳 (BC) 来源,微生物衍生的BC (mBC),已在深海冷透中被发现. 这种以前未被识别的碳汇对海洋碳循环模型和甲研究产生了重大影响.

科学领域:

地质化学地质化学
海洋地质学海洋地质学
生物地质化学生物地质化学

背景情况:

海洋沉积物黑碳 (BC) 传统上与陆地生物质和化石燃料燃烧有关.
海洋BC预算中的不平衡表明缺少的资源.
深海冷被探索为潜在的新源.

研究的目的:

在深海冷中识别和量化微生物衍生的黑碳 (mBC).
评估冷流向全球海洋BC预算的贡献.
调查冷活动的历史演变.

主要方法:

沉积物核心的高分辨率地质化学分析.
稳碳同位素分析BC和总有机碳.
放射测年法和多代理记录.

主要成果:

微生物衍生的黑碳 (mBC) 被确定为东南盆地的一个重要组成部分.
极度耗尽的稳定碳同位素 (BC为-37.74‰,TOC为-55.39‰) 将mBC与无氧甲氧化联系起来.
据估计,冷流贡献了0.52-0.79 Tg mBC yr-1,占海洋BC埋葬的4.1-5.9%.
过去一个世纪的Seep进化被重建.

结论:

深海的冷流代表着一个重要的,以前未被识别的海洋BC沉没.
这些发现需要对海洋碳循环模型进行修订,以包括mBC.
mBC可以作为古甲活动的有价值的代理.

关键词:

人类产生的信号.碳水槽的碳水槽.寒冷的透,透到我们身上.微生物衍生的黑碳.旧生态环境的代理.

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