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气候变化改变了欧洲洪水的发生时间
Günter Blöschl1, Julia Hall2, Juraj Parajka2
1Institute of Hydraulic Engineering and Water Resources Management, Technische Universität Wien, Vienna, Austria. bloeschl@hydro.tuwien.ac.at.
概括
气候变化正在改变整个欧洲的河流泛滥时间. 较高的气温导致东北地区的春季洪水较早,西部地区的冬季洪水较早,而延迟的风暴则导致北海附近的冬季洪水较晚.
科学领域:
- 水文学
- 气候科学
- 环境科学
背景情况:
- 全球变暖影响了河流洪水的动态,但洪水规模的持续大规模气候变化信号仍然难以捉摸.
- 观测到的洪水发生时间变化对于了解气候变化对水系统的影响至关重要.
研究的目的:
- 分析过去五十年欧洲河流的洪水时间.
- 识别并将洪水发生时间的观察变化归因于特定的气候驱动因素.
主要方法:
- 使用了包括4262个观测水文站的泛欧洲数据库.
- 分析了过去50年的历史洪水数据.
主要成果:
- 在河流洪水发生的时间变化中确定了明显的,大陆范围的模式.
- 较高的气温与欧洲东北部早些时候的融雪洪水有关.
- 与极地变暖相关的冬季风暴延迟导致北海和地中海沿岸的冬季洪水.
- 较早的土壤湿度最大值导致西欧冬季洪水较早发生.
结论:
- 一个明显的气候变化信号在观察到的欧洲河流洪水时间中很明显.
- 洪水发生时间的区域差异是由不同的气候机制驱动的.
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