Recent California Water Year Precipitation Deficits: A 440-Year Perspective*

Recent California Water Year Precipitation Deficits: A 440-Year Perspective*
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最近加州水年降水赤字:440 年的视角*

DOI:
10.1175/jcli-d-14-00774.1
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发表时间:
2015
期刊:
影响因子:
4.9
通讯作者:
E. Wahl
E. Wahl
中科院分区:
地球科学2区
文献类型:
--
作者:
H. Diaz;E. Wahl

文献摘要

被引文献

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对2013年10月至2014年9月美国西部,特别是加利福尼亚-内华达地区降水的分析表明,这个异常干燥的季节虽然极端,但与大约120年的仪器记录的水年(WY;10-9月)总量相比,以及与1571年以来407年的WY降水重建相比,并不是史无前例的。在这段较长的时间里,已知或估计有九个年份几乎与2014年WY一样干燥或更干燥。2012-14年的三年赤字超过了加利福尼亚州的年平均降雨量,这是更极端的,但也不是史无前例的,在过去大约440年的重建中发生了另外三次。在过去的14年里,WY的平均降水量也是不足的,在作者合并的重建和仪器周期记录中,这样的WY主要是干燥的也是罕见的。
AbstractAn analysis of the October 2013–September 2014 precipitation in the western United States and in particular over the California–Nevada region suggests this anomalously dry season, while extreme, is not unprecedented in comparison with the approximately 120-yr-long instrumental record of water year (WY; October–September) totals and in comparison with a 407-yr WY precipitation reconstruction dating back to 1571. Over this longer period, nine other years are known or estimated to have been nearly as dry or drier than WY 2014. The 3-yr deficit for WYs 2012–14, which in California exceeded the annual mean precipitation, is more extreme but also not unprecedented, occurring three other times over the past approximate 440 years in the reconstruction. WY precipitation has also been deficient on average for the past 14 years, and such a run of predominantly dry WYs is also a rare occurrence in the authors’ merged reconstructed plus instrumental period record.