气候变暖加剧了永久土占主导地位的西伯利亚东部的化学气候变化
Ping Wang1, Qiwei Huang1, Shiqi Liu2
1Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 11A, Datun Road, Chaoyang District, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China.
The Science of the total environment
|September 29, 2023
概括
气候变暖正在加快西伯利亚河流中的水地化学过程. 永久土融化导致河流中矿物质含量增加,影响淡水质量,增加化学物质流,特别是在冬季.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 水文学的水文学
背景情况:
- 了解气候变暖对永久土地区的影响,对于预测水地化学变化至关重要.
- 在西伯利亚东部永久土地区量化背景河水化学是评估气候变化影响的关键.
- 以前的研究还没有充分解决西伯利亚河流水地化学对变暖的反应.
研究的目的:
- 量化西伯利亚东部河流中化学成分的自然背景水平.
- 评估这些河流系统对气候变暖的反应.
- 了解控制永久土占主导地位的地区河流水化学的水地化学过程.
主要方法:
- 利用了一个全面的河水化学数据库 (n=1264) 跨越了1940-2019年.
- 分析了总溶解固体 (TDS) 和主要离子 (Ca2+,Mg2+) 的度.
- 与气候相关的变量 (温度,活性层厚度,叶面积指数) 和侵蚀因素 (降水,海拔,坡度) 相关联的水地化学参数.
主要成果:
- 没有永久土的河流盆地显示的总溶解固体 (TDS) 是永久土占主导地位的盆地的2.3倍.
- 以 (Ca2+ + Mg2+) 度表示的碳酸盐气候变化是水地化学循环的主要驱动因素,对变暖敏感.
- (Ca2+ + Mg2+) 度随着温度升高到0.10 mmol/L·°C而增加,表明碳酸盐气候变化的加速.
- 包括TDS和主要离子在内的河流化学流在变暖下显著增加,特别是在冬季,这是由于永久土解增加了矿物质含量的地下水排放.
结论:
- 气候变暖正在加快永久土主导的北极盆地中的水地化学过程.
- 永久土的退化显著影响淡水质量,增加了河流化学品的出口.
- 碳酸气候变化是应对气候变暖的关键过程,影响全球碳循环和当地水化学.
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