变暖推动了从原始阿尔卑斯山土壤出口溶解的有机碳.
Andrew R Pearson1,2, Bethany R S Fox3, John C Hellstrom4
1Environmental Research Institute, School of Science, Faculty of Science and Engineering, University of Waikato, Kirikiriroa Hamilton, Waikato, Aotearoa, New Zealand. Andrew.Pearson@esr.cri.nz.
Nature communications
|April 25, 2024
概括
气候对土壤溶解有机碳 (DOC) 的出口产生重大影响. 温暖的温度,就像在全新世纪气候最佳时期一样,从历史上看,从山地土壤中出DOC的数量增加了一倍或三倍.
科学领域:
- 古气候学 古气候学
- 生物地质化学生物地质化学
- 环境科学 环境科学
背景情况:
- 了解气候对土壤溶解有机碳 (DOC) 出口的影响对于准确的全球碳模型至关重要.
- 有限的长期数据和混因素阻碍了精确的气候-DOC出口关系评估.
- 阿尔卑斯山流域为重建过去的环境变化提供了宝贵的档案.
研究的目的:
- 为了重建过去的溶解有机碳 (DOC),在阿尔卑斯山环境中超过14,000年漏.
- 调查过去气候变化和DOC出口之间的关系.
- 通过了解长期的DOC动态来改善全球碳模型的约束.
主要方法:
- 利用了古老环境档案:来自新西兰的两个洞穴和一个湖泊沉积物核心.
- 专注于在公元1200年之前的人为影响最小的山区流域.
- 重建的DOC漂水趋势大约跨越4°的度.
主要成果:
- 在全新世纪期间的温度升高,特别是全新世纪气候最佳期 (HCO),与增加的土著DOC出口相关.
- 在HCO期间的DOC出口 (1.5-2.5°C比工业前晚期更热) 与较冷时期相比翻了一番或翻了三倍.
- 在 Holocene 中期较冷的时期,DOC 出口量下降.
结论:
- 温度是HCO期间土壤DOC出口增加的主要驱动因素,可能是通过植被和微生物反应.
- 未来气候变暖可能会增加来自山区的DOC出口.
- 增加的DOC出口对全球碳循环和淡水质量有重大影响.
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