通过地表水调节,在全球河流中重新分配溶解无机的载荷和运输
Shuang Liu1, Kaiheng Hu1, Zhenghui Xie2
1Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610299, China.
The Science of the total environment
|January 18, 2025
概括
表面水调节显著影响河流中溶解无机 (DIN) 的运输. 人类用水改变了河流的N负载,并减少了DIN出口到海洋,特别是太平洋和大西洋.
科学领域:
- 环境科学 环境科学
- 水文学的水文学
- 生物地质化学生物地质化学
背景情况:
- 地表水 (SW) 调节,包括水库管理和用水,深刻影响土壤-河流水文过程.
- 这些变化显著影响了溶解无机 (DIN) 从河流到海洋的运输.
- 关于SW法规对DIN转移的全球影响仍未得到充分研究.
研究的目的:
- 调查地表水法规对全球主要河流中溶解无机 (DIN) 装载和运输的全球影响.
- 量化DIN去除率和出口流向各种海洋的变化,这是由于人类的水资源管理实践.
主要方法:
- 利用最近开发的陆地表面模型进行全球规模的模拟.
- 进行了三个不同的模拟,涵盖了1991-2000年期间.
- 分析了水库调节和地表水的提取/使用对DIN动态的影响.
主要成果:
- 表面水调节显著加快了河流气负载.
- 仅仅是水库调节就能在大多数河流中将DIN去除率降低5-20%.
- DIN流量显著下降 (100-1000t N yr-1),黄河流域显示最实质性的减少.
- DIN对太平洋,大西洋和印度洋的出口减少了40-50%,而北冰洋则经历了较小的影响.
- 在DIN出口减少的时间趋势有所不同,大西洋的持续下降和太平洋的相反趋势.
结论:
- 表面水调节对全球河流气动态产生重大影响.
- 人类对水的使用改变了的负载,去除率,以及对海洋的出口.
- 这些发现为了解人类活动影响的河流中循环提供了关键的见解.
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