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在美国西部的大气远程连接模式和水文鞭伤
Wenzhao Li1,2, Surendra Maharjan1, Hesham El-Askary3,4,5
1Earth Systems Science and Data Solutions Lab, Chapman University, Orange, CA, 92866, USA.
Scientific reports
|July 2, 2025
概括
美国西部的水文模式显示,与气候波动相关的湿干转移或"鞭毛"增加了. 未来的预测表明降水变化更大,需要适应性水资源管理.
科学领域:
- 水文学的水文学
- 气候科学 气候科学
- 水资源管理 水资源管理
背景情况:
- 美国西部正在经历显著的水文变化,标志着变化增加和极端潮湿和干旱时期.
- 这些转变,称为水文鞭毛,对水资源管理构成挑战.
研究的目的:
- 分析美国西部水文伤事件的趋势.
- 为了确定流量极端和气候远程连接因素之间的联系.
- 使用气候模型预测未来的降水变化.
主要方法:
- 来自469个站点 (1981-2023) 的流量数据分析.
- 与气候指数的相关性分析:西太平洋振荡 (WP),东太平洋/北太平洋振荡 (EPO),厄尔尼诺-南方振荡 (ENSO) 和马登-朱利安振荡 (MJO).
- 利用结合模型对比项目第五阶段 (CMIP5) 和第六阶段 (CMIP6) 模型进行未来预测.
主要成果:
- 观察到水文鞭毛事件的大幅增加,在20世纪90年代初,干湿转移的峰值.
- 在流量极端和WP和EPO振荡之间发现了强烈的相关性.
- MJO 2/3阶段显示,与太平洋西南地区 (十月至十二月) 的潮湿条件有显著的积极关系.
- CMIP5和CMIP6预测显示降水变化增加,CMIP5 RCP 8.5情景显示波动性增加.
结论:
- 由于气候远程连接,美国西部的水文鞭伤事件正在增加.
- 未来的气候预测表明,趋势是趋向于更不稳定的降雨模式.
- 适应性和灵活的水资源管理策略对于应对水文不可预测性至关重要.
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