Evidence that Recent Warming is Reducing Upper Colorado River Flows
Evidence that Recent Warming is Reducing Upper Colorado River Flows
复制标题
有证据表明最近的变暖正在减少科罗拉多河上游的流量
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
S. McAfee
中科院分区：
文献类型：
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作者：
G. McCabe;D. Wolock;G. Pederson;C. Woodhouse;S. McAfee
科罗拉多河上游流域(UCRB)是美国西部的主要水源之一，气温上升可能会增加该流域供水减少的风险。虽然水年降水量的变化比水年的水温变化更能解释水年UCRB径流的变化，但自1980年代后期以来，UCRB温度的升高已导致UCRB径流效率(径流与降雨量之比)显著降低。这些由于气温上升而导致的流量减少是有记录以来与温度相关的最大降幅。在过去的三十年里，由于地下水边界层温度的升高，地下暗渠的年平均流量偏离了−1.306亿立方米(或−年平均流量的7%)。此外，暖季(4月至9月)温度对水年UCRB径流变率的影响大于冷季(10月至9月)。
AbstractThe upper Colorado River basin (UCRB) is one of the primary sources of water for the western United States, and increasing temperatures likely will elevate the risk of reduced water supply in the basin. Although variability in water-year precipitation explains more of the variability in water-year UCRB streamflow than water-year UCRB temperature, since the late 1980s, increases in temperature in the UCRB have caused a substantial reduction in UCRB runoff efficiency (the ratio of streamflow to precipitation). These reductions in flow because of increasing temperatures are the largest documented temperature-related reductions since record keeping began. Increases in UCRB temperature over the past three decades have resulted in a mean UCRB water-year streamflow departure of −1306 million m3 (or −7% of mean water-year streamflow). Additionally, warm-season (April through September) temperature has had a larger effect on variability in water-year UCRB streamflow than the cool-season (October through Ma...