罗西河的全新世环境变化及其对沉积碳储存的影响
Cindy De Jonge1, Nathalie Dubois2, S Nemiah Ladd3
1Geological Institute, ETH Zurich, Sonneggstrasse 5, 8092 Zurich, Switzerland.
概括
罗西湖沉积物的古环境分析显示,气候变暖和人类土地使用对碳储存产生了重大影响,超过13000年. 最近的环氧化进一步增加了碳积累率.
科学领域:
- 古代气候学是一种古气候学.
- 气候科学 气候科学
- 环境科学 环境科学
背景情况:
- 湖泊沉积物为重建过去的环境变化提供了宝贵的档案.
- 了解湖泊中的长期碳储存对于气候变化评估至关重要.
- 山湖是气候和土地利用影响的敏感指标.
研究的目的:
- 评估气候变化和人类对湖泊沉积碳储存的长期影响.
- 在罗西湖沉积物中重建碳质量积累率 (MARs),自从13000年前 (BP) 开始.
- 用多代理方法探索影响沉积碳储存的湖泊系统变化.
主要方法:
- 来自Rotsee的沉积物核心分析,这是一个近山湖.
- 多代理方法包括X射线光 (XRF),碳和同位素,有机巨分子化学成分和古代DNA (aDNA).
- 自13万年前以来,有机和无机碳MAR的重建.
主要成果:
- 早期Holocene:混合植物浮游生物和流域有机物质,无机和有机碳的沉积.
- 全新纪热极值:由于变暖而增加沉积碳储存.
- 中期到晚期的全新纪:有机物质增加,植物浮游生物衍生的碳含量低,有机碳MARs增加,特别是在森林砍伐事件 (新石器,罗马时代) 之后.
- 最近的沉积物 (上个世纪):由于高化,碳积累率更高.
结论:
- 气候变暖和人类土地使用对罗西湖的湖泊开发和沉积碳储存产生了重大影响.
- 罗西湖作为一个案例研究,对高海拔湖泊的碳动态有更广泛的影响.
- 高海拔湖泊的未来碳平衡将受到持续的气候变化和人类造成的压力的影响.
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