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硫化物氧化和碳酸盐溶解作为地质时间尺度上的二氧化碳来源

Mark A Torres¹, A Joshua West¹, Gaojun Li²

¹Department of Earth Sciences, University of Southern California, Los Angeles, California 90089, USA.

|March 21, 2014

概括

地球的长期碳循环稳定性可能是由以前未知的二氧化碳 (CO2) 源解释的:增强的硫化物氧化加上碳酸盐溶解. 这种可能由构造上升驱动的过程有助于平衡地质时间尺度上的酸盐气候变化的二氧化碳消耗.

科学领域:

地质化学地质化学
地球科学地球科学地球科学
古气候学古气候学

背景情况:

地球的气候稳定依赖于平衡地球内部的二氧化碳 (CO2) 排放与通过酸盐气候变化的二氧化碳消耗.
代的同位素记录表明,由于山脉升起,气候变化增加了二氧化碳的吸收,但火山二氧化碳的输入没有增加,造成了碳循环悖论.
这种不平衡对理解长期碳循环质量平衡和地球化学记录构成了挑战.

研究的目的:

调查与地质时间尺度相关的潜在的空气二氧化碳 (CO2) 短暂来源.
为了使代的同位素记录与长期碳循环质量平衡相协调.
探索硫化物氧化与碳酸盐溶解在调节大气CO2中的作用.

主要方法:

考古时期同位素记录的分析 (,,).
海底扩散和火山脱气速度的重建.
地质化学过程的建模,包括硫化物氧化和碳酸盐溶解.

主要成果:

增强的硫化物氧化与碳酸盐溶解相结合,为大气提供了暂时的二氧化碳来源.
这种二氧化碳来源很可能是由构造上升增强的,类似于酸盐气候变化.
这一过程为二氧化碳大气局部压力的相对稳定提供了可信的解释.

结论:

硫化物氧化与碳酸盐溶解相结合,是长期碳循环的重要,但经常被忽视的组成部分.
这种机制通过提供平衡气候变化的二氧化碳来源,有助于解决"代同位素气候变化悖论".
为了准确地重建地球碳循环演化的过程,需要进一步考虑这一过程.

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