Placing the 2012–2015 California‐Nevada drought into a paleoclimatic context: Insights from Walker Lake, California‐Nevada, USA
Placing the 2012–2015 California‐Nevada drought into a paleoclimatic context: Insights from Walker Lake, California‐Nevada, USA
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将 2012-2015 年加州-内华达州干旱置于古气候背景下：来自美国加州-内华达州沃克湖的见解
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
S. Bassett
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作者：
B. Hatchett;D. Boyle;A. Putnam;S. Bassett
评估区域水文对过去气候变化的响应可以为水资源如何应对当前和未来的气候变化提供指导。在这里，我们采用了耦合的水平衡和湖泊蒸发模型来研究步行者湖的行为在中世纪气候异常（MCA），一个时间记录水文气候极端。基于14 C的海岸线高程年表、西步行者河中的水下亚化石树桩以及区域性古代理证据表明，约50年的洪积事件跨越了两次140多年的干旱。我们开发了MCA气候的估计，以检查瞬态湖泊的行为和评估流域对气候变化的响应。我们的研究结果表明，十年气候持续性的重要性，以引起大的湖泊水位波动。我们还模拟了当前2012-2015年加州-内华达州的干旱，发现当前干旱的平均严重程度超过了MCA干旱，但持续时间没有。
Assessing regional hydrologic responses to past climate changes can offer a guide for how water resources might respond to ongoing and future climate change. Here we employed a coupled water balance and lake evaporation model to examine Walker Lake behaviors during the Medieval Climate Anomaly (MCA), a time of documented hydroclimatic extremes. Together, a 14C‐based shoreline elevation chronology, submerged subfossil tree stumps in the West Walker River, and regional paleoproxy evidence indicate a ~50 year pluvial episode that bridged two 140+ year droughts. We developed estimates of MCA climates to examine the transient lake behavior and evaluate watershed responses to climate change. Our findings suggest the importance of decadal climate persistence to elicit large lake‐level fluctuations. We also simulated the current 2012–2015 California‐Nevada drought and found that the current drought exceeds MCA droughts in mean severity but not duration.