A new normal for streamflow in California in a warming climate: Wetter wet seasons and drier dry seasons

A new normal for streamflow in California in a warming climate: Wetter wet seasons and drier dry seasons
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气候变暖下加利福尼亚州水流的新常态:湿润的雨季和干燥的旱季

DOI:
10.1016/j.jhydrol.2018.10.023
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发表时间:
2018
影响因子:
6.4
通讯作者:
AghaKouchak, Amir
AghaKouchak, Amir
中科院分区:
地球科学1区
文献类型:
--
作者:
Mallakpour, Iman;Sadegh, Mojtaba;AghaKouchak, Amir

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在这项研究中,我们利用全球气候模式(GCM)模拟得到的两条典型浓度路径(RCP4.5和RCP8.5)下的偏差校正和路线径流,研究了加州未来径流的变化。与以往主要集中在平均径流、年最大值或季节性的研究不同,我们主要关注径流分布的预测变化及其潜在原因。我们报告了未来径流模拟的两个相反的趋势:低流量低流量和高流量高流量,未来流量相对于历史基线的总体平均值没有变化(在0.05水平上具有统计学意义)。此外,结果表明,在雨季的大部分时间(12月至3月),径流流量预计将增加,而在今年剩余时间(即较潮湿的雨季和较干燥的季节),径流流量预计将减少。我们认为,加州径流的预计变化是由气候变暖时降雪模式和极端降水的预期变化驱动的。未来低流量和极高流量的变化可能会对水资源规划、干旱管理以及基础设施设计和风险评估产生重大影响。
In this study, we investigate changes in future streamflows in California using bias-corrected and routed streamflows derived from global climate model (GCM) simulations under two representative concentration pathways (RCPs): RCP4.5 and RCP8.5. Unlike previous studies that have focused mainly on the mean streamflow, annual maxima or seasonality, we focus on projected changes across the distribution of streamflow and the underlying causes. We report opposing trends in the two tails of the future streamflow simulations: lower low flows and higher high flows with no change in the overall mean of future flows relative to the historical baseline (statistically significant at 0.05 level). Furthermore, results show that streamflow is projected to increase during most of the rainy season (December to March) while it is expected to decrease in the rest of the year (i.e., wetter rainy seasons, and drier dry seasons). We argue that the projected changes to streamflow in California are driven by the expected changes to snow patterns and precipitation extremes in a warming climate. Changes to future low flows and extreme high flows can have significant implications for water resource planning, drought management, and infrastructure design and risk assessment.
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