在沉没的海洋颗粒中,微生物增强了石的溶解
Benedict Borer1,2, Adam V Subhas3, Matthew G Hayden3
1Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139.
概括
海洋颗粒中的微生物代谢驱动石溶解,即使在超和水中. 这一过程会影响粒子沉降,并可能降低海洋碳捕获效率.
科学领域:
- 海洋地化学和微生物生态学.
- 碳酸在海洋中的生物地质化学循环.
背景情况:
- 在表面海洋中碳酸 (阿拉戈尼特和石) 的溶解情况尚不清楚.
- 在海洋颗粒中驱动稳定多态物溶解的机制仍然不受限制.
研究的目的:
- 量化海洋颗粒中的微生物代谢如何增强石溶解.
- 研究微生物诱导的酸性微环境在颗粒溶解中的作用.
主要方法:
- 在海洋颗粒中测量石溶解速率的实验量化.
- 分析粒子脱氧和酸化之间的时间脱.
- 微生物驱动的溶解速度与非生物溶解的比较.
主要成果:
- 微生物的新陈代谢创造了酸性微环境,显著增强了当地的石溶解.
- 细菌生长的颗粒中的溶解速率超过了非生物速率超过一个数量级.
- 最高的溶解速率发生在中间粒子沉积速度,平衡质量转移和呼吸.
结论:
- 微生物活动,而不仅仅是来自呼吸的二氧化碳,导致海洋颗粒中的酸盐不和.
- 在中层海洋中微生物驱动的溶解可以通过溶解石压载物来改变粒子过境时间.
- 减少石压载物可能会降低海洋碳捕获的效率.
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