从陆地生物圈吸入的碳的年龄减少,其分布不对称性增加
Carlos A Sierra1, Gregory R Quetin2,3, Holger Metzler1,4
1Department of Biogeochemical Processes, Max Planck Institute for Biogeochemistry, Jena 07745, Germany.
概括
全球变化减少了陆地生物圈的碳运输时间. 提高生产率加速了年轻的碳循环,超过了气候变暖对呼吸的影响,导致整体碳循环更快.
科学领域:
- 生态生态学 生态生态学
- 生物地质化学生物地质化学
- 气候科学 气候科学
背景情况:
- 陆地生物圈在调节大气中二氧化碳水平方面发挥着至关重要的作用.
- 了解碳转运时间对于预测气候变化反至关重要.
- 全球变化因素,包括温度和生产力,影响碳循环的动态.
研究的目的:
- 为了建模和估计碳通过陆地生物圈的运输时间.
- 调查提高生产力和呼吸对碳转运时间的不同和综合影响.
- 分析20世纪碳过境时间分布的时间变化.
主要方法:
- 利用基于模型的方法来估计从光合作用到呼吸的碳转运时间.
- 采用碳数据模型框架 (CARDAMOM) 的一组模拟轨迹.
- 将20世纪的全球变化场景纳入模拟中.
主要成果:
- 较高的呼吸率 (由于变暖) 增加了通过呼吸老碳的运输时间.
- 提高生产率可以通过为新陈代谢提供更多的年轻碳来减少运输时间.
- 暖化和生产率的综合影响导致运输时间的总体减少,生产率占主导地位.
- 模拟显示,整个20世纪碳运输时间的下降.
- 碳转运时间分布变得更加不对称,热带/温带的转运速度更快,高度地区的碳排放更老.
结论:
- 由于20世纪生产力增加,地球生物圈的碳循环加速了.
- 全球变化改变了碳运输时间的空间分布,在低度地区的循环速度更快,高度地区的旧碳释放速度更慢.
- 陆地生物圈对全球变化的反应是复杂的,涉及碳循环的速度和空间模式的变化.
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