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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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在气候变暖的情况下,从高海拔河流中增加碳出口.

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Environmental science & technology
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概括

山地生态系统的变暖显著增加了河流的溶解无机碳 (DIC) 出口,特别是在永久土地区. 永久土的融化增加了碳的释放,改变了河流碳动态.

关键词:
青海西藏高原 青海西藏高原碳循环中的碳循环.碳同位素是碳的同位素.气候变化 气候变化 气候变化集中放电关系关系

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科学领域:

  • 环境科学 环境科学
  • 地质化学 地质化学
  • 气候科学 气候科学

背景情况:

  • 高海拔的山脉面临着快速变暖,影响陆地碳出口.
  • 这些敏感地区气候变暖对河流碳出口的影响尚不清楚.
  • 永久土融是高山环境中的一个关键过程.

研究的目的:

  • 调查全球变暖对清海-西藏高原河流中溶解无机碳 (DIC) 和有机碳出口的影响.
  • 为了区分变暖和永久土融化对河流碳动态的影响.
  • 分析碳同位素和度的长期和短期数据集.

主要方法:

  • 收集了关于溶解无机碳 (DIC) 的长期数据.
  • 从金沙河 (JSR) 和雅龙河 (YLR) 获取的DIC, δ13C-DIC和有机碳的短期数据.
  • 分析了与温度,降水和排放有关的碳度和流量.

主要成果:

  • 高海拔JSR (51%的永久土) 的变暖 (>3°C) 和降水增加导致DIC度增加35%,DIC流量增加110%.
  • 在较低海拔的YLR (14%的永久土) 中相似的变暖并没有导致DIC的类似增加.
  • 在JSR中的DIC度随着变暖而从稀释转变为化学静止,在高排放下较轻的δ13C-DIC表明永久土融化的贡献.

结论:

  • 变暖是改变高海拔河流系统侧向碳出口的主要驱动因素.
  • 永久土融化通过增强土壤呼吸和气候变化,显著提高DIC生产和出口.
  • 河流碳出口模式因变暖而改变,永久土地区显示出放大反应.