阿拉伯海脱变化的千年级变化对大气二氧化碳的影响
Mark A Altabet1, Matthew J Higginson, David W Murray
1School for Marine Science and Technology, University of Massachusetts Dartmouth, 706 S. Rodney French Boulevard, New Bedford, Massachusetts 02744-1221, USA. maltabet@umassd.edu
Nature
|January 24, 2002
概括
海洋脱,对于调节温室气体至关重要,在最后一个冰川时期,阿拉伯海显示出千年规模的变化. 这些变化迅速重组生态系统以应对气候变化,影响全球生产力.
科学领域:
- 海洋生物地质化学海洋生物地质化学
- 古气候学 古气候学
- 海洋学 海洋学 海洋学
背景情况:
- 全球生物地化学过程,包括海洋脱,通过调节温室气体影响气候.
- 海洋脱影响了氧化的产生和通过生物吸收海洋的二氧化碳.
- 了解脱化对快速气候变化的反应对于气候反评估至关重要.
研究的目的:
- 为了研究在最后一个冰川时期阿拉伯海脱和生产力的千年规模的变化.
- 为了将这些变化与快速气候事件 (如Dansgaard-Oeschger事件) 相关联.
- 了解驱动生态系统重组以应对气候变化的机制.
主要方法:
- 从高积累沉积芯中分析同位素比率,含量和丰度.
- 沉积物核心数据与格陵兰冰芯记录的相关性 (丹斯加尔德-奥什格尔事件).
- 对来自南极冰芯的长期气候振荡的检查.
主要成果:
- 在最后一个冰川时期,阿拉伯海脱和生产率的千年级变化被确定为相当大的.
- 在这些海洋变化和格陵兰冰芯记录之间发现了详细的对应,表明了快速的,百年级的生态系统重组.
- 变化是由夏季季风潮上升的强度介导的,这与气候外游有关.
- 全球海洋生产力对脱变化的反应发生在较低频率,与南极气候和二氧化碳波动相关.
结论:
- 阿拉伯海的脱和生产率表现出快速的,百年级的气候变化反应,以季风上升为媒介.
- 这些快速的海洋生态系统转变对全球碳循环和大气二氧化碳水平有影响.
- 固定的长停留时间表明,全球海洋生产力对气候变化的反在较低的频率上运行.
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