在由喜马拉雅侵蚀系统维持的孟加拉风扇中有效地埋葬有机碳
Valier Galy1, Christian France-Lanord, Olivier Beyssac
1Nancy Université, CRPG CNRS/INSU, BP 20, 54501 Vandoeuvre-lès-Nancy, France. vgaly@whoi.edu
Nature
|November 16, 2007
概括
喜马拉雅山的侵蚀有效地将有机碳埋在孟加拉风扇中,作为一个重要的碳汇. 这个过程有助于调节大气中的二氧化碳水平在地质时间.
科学领域:
- 地质化学 地质化学
- 气候科学 气候科学
- 沉积物学的沉积物学
背景情况:
- 大陆侵蚀通过酸盐气候变化和有机碳埋葬影响大气中的二氧化碳 (CO2).
- 有机碳沉积效率受到沉积物容量和氧化作用的限制.
- 全球研究表明,大量的河流有机碳返回到大气中 (例如亚马逊盆地).
研究的目的:
- 为喜马拉雅侵蚀系统创建一个全面的有机碳预算.
- 调查对有机碳出口和在孟加拉湾沉积的控制.
- 量化这个系统在全球碳循环和气候调节中的作用.
主要方法:
- 在喜马拉雅源岩,河流沉积物和孟加拉风扇海洋沉积物中分析有机碳.
- 在整个侵蚀系统中量化有机碳预算.
- 在运输和沉积过程中评估氧化损失.
主要成果:
- 有机碳出口主要由沉积物特性控制.
- 在运输和沉积过程中,有机碳的氧化损失是可以忽略不计的.
- 70-85%的出口有机碳是最近的,在运输过程中被捕获,作为净二氧化碳吸收器.
- 孟加拉盆地埋葬占海洋沉积物中埋葬的陆地有机碳总量的10-20%.
结论:
- 喜马拉雅山脉的高侵蚀率导致孟加拉湾的高沉积和低氧气,使有机碳埋葬效率极高.
- 通过加强侵蚀和有机碳埋葬,活跃的气系统通过缓冲大气中的CO2对气候产生负面反.
- 喜马拉雅 - 孟加拉风扇系统是全球碳循环的关键组成部分,影响长期气候稳定.
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