寒冷海域的黑碳形成及其对海洋黑碳预算的潜在贡献
Xudong Wang1,2, Mingzhu Lin1, Jörn Peckmann3
1College of Oceanography and Ecological Science, Shanghai Ocean University, Shanghai 201306, China.
Environmental science & technology
|April 21, 2025
概括
在海洋环境中,厌氧甲类古生物 (ANME) 产生黑碳 (BC). 这项研究在透的碳酸盐中发现了ANME衍生的BC,这表明微生物在海洋BC循环和深海碳封存中发挥了重要作用.
科学领域:
- 地质化学 地质化学
- 海洋生物学 海洋生物学
- 气候科学 气候科学
背景情况:
- 碳黑 (BC) 在长期碳封存中起着至关重要的作用,影响气候变化动态.
- 虽然已知厌氧甲类古生物 (ANME) 在实验室环境中产生BC,但它们对海洋BC循环的贡献仍未得到充分研究.
研究的目的:
- 为了研究BC在南中国海和墨西哥湾入碳酸盐中的地化学性质.
- 确定ANME衍生BC在自然海洋环境中的发生和重要性.
- 评估微生物产生的BC对海洋BC池的贡献及其对深海碳循环的影响.
主要方法:
- 在透碳酸盐中分析BC的地化学性质,包括稳定的碳同位素 (δ13C).
- 应用贝叶斯混合模型来量化微生物产生的BC的比例.
- 从现有研究中整合放射性碳 (Δ14C) 数据,以评估深海BC的年龄.
主要成果:
- 在天然透碳酸盐中发现ANME衍生BC,其证据是低至-45.2‰的δ13C值.
- 估计微生物产生的BC占研究透碳酸盐中总BC的2-33%.
- 证据表明,深海BC通常比相关的有机碳更古老,而入衍生BC是老化溶解BC的潜在来源.
结论:
- 这项研究提供了第一个在海洋环境中产生ANME的自然证据.
- 微生物BC生产是海洋BC循环的重要,以前被低估的组成部分.
- 漏衍生的BC可能在深海的老化溶解有机碳池中发挥关键作用,影响长期的碳封存.
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