Reconstructing Extreme Precipitation in the Sacramento River Watershed Using Tree‐Ring Based Proxies of Cold‐Season Precipitation

Reconstructing Extreme Precipitation in the Sacramento River Watershed Using Tree‐Ring Based Proxies of Cold‐Season Precipitation
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使用基于树环的寒冷季节降水代理重建萨克拉门托河流域的极端降水

DOI:
10.1029/2020wr028824
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发表时间:
2021
影响因子:
5.4
通讯作者:
Steinschneider, Scott
Steinschneider, Scott
中科院分区:
地球科学1区
文献类型:
--
作者:
Borkotoky, Swatah Snigdha;Williams, A. Park;Cook, Edward R.;Steinschneider, Scott

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极端降水和随之而来的洪水是加州最具破坏性的自然灾害之一,但它们对该州的供水也至关重要。这就促使我们需要更好地了解该地区这些事件的长期变化。本研究探讨了利用美国西部基于树木年轮的湿度代理网络重建北加州萨克拉门托河流域 (SRW) 极端降水事件的可能性。我们首先对 100°W 以西的冷季标准化降水指数 (SPI) 进行网格重建。然后,我们制定了 SRW 区域极端降水发生的年度指数,并使用弹性网络回归将该指数与基于网格、树木年轮的 SPI 联系起来。这些回归仅使用整个 SRW 以及美国西部更广泛地区的 SPI 数据构建,用于重建自公元 1400 年以来极端降水频率的年际变化。 SPI 重建工作遍及西部大部分地区,包括萨克拉门托谷和俄勒冈州中部。重建的 SPI 还捕捉了极端软水温降水的历史年际变化,尽管个别事件可能被低估或高估。重建结果显示 1580 年至 1700 年以及 1850 年至 1915 年期间出现了更多的 SRW 极端情况,1550 年之前则缺乏极端情况,并且 1550 年之后出现 2-8 年的振荡。在 SRW 之外使用树木年轮代理通常会抑制重建的极端情况,但这些数据有时有助于识别已知的极端事件。总体而言,SRW极端降水的重建有助于更好地了解这些事件的历史变化。
Extreme precipitation and consequent floods are some of California's most damaging natural disasters, but they are also critical to the state's water supply. This motivates the need to better understand the long‐term variability of these events across the region. This study examines the possibility of reconstructing extreme precipitation occurrences in the Sacramento River Watershed (SRW) of Northern California using a network of tree‐ring based moisture proxies across the Western US. We first develop a gridded reconstruction of the cold‐season standardized precipitation index (SPI) west of 100°W. We then develop an annual index of regional extreme precipitation occurrences in the SRW and use elastic net regression to relate that index to the gridded, tree‐ring based SPI. These regressions, built using SPI data across the SRW only and again across a broader region of the Western US, are used to develop reconstructions of interannual variability in extreme precipitation frequency back to 1400 CE. The SPI reconstruction is skillful across much of the West, including the Sacramento Valley and Central Oregon. The reconstructed SPI also captures historical interannual variations in extreme SRW precipitation, although individual events may be under‐ or over‐estimated. The reconstructions show more SRW extremes from 1580 to 1700 and 1850 to 1915, a dearth of extremes prior to 1550, and a 2–8 year oscillation after 1550. Using tree‐ring proxies beyond the SRW often dampens the reconstructed extremes, but these data occasionally help to identify known extreme events. Overall, reconstructions of SRW extreme precipitation can help to understand better the historic variability of these events.
使用高海拔针叶树年轮建模的多世纪内华达山脉积雪重建(美国加利福尼亚州)
DOI: --
发表时间: 2020
期刊:
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发表时间: 2019-07-01
期刊: EARTHS FUTURE
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