How unusual is the 2012-2014 California drought?
How unusual is the 2012-2014 California drought?
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DOI：
10.1002/2014gl062433
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发表时间：
2014-12-28
影响因子：
5.2
通讯作者：
Anchukaitis, Kevin J.
中科院分区：
文献类型：
--
作者：
Griffin, Daniel;Anchukaitis, Kevin J.
在过去的三年里（2012-2014年），加州经历了上个世纪以来最严重的干旱状况。但这一事件有多不寻常？在这里，我们使用两个古气候重建干旱和降水的中部和南部加州，把这个当前的事件在过去的千年的背景下。我们证明，虽然持续低于平均土壤湿度的3年周期并不罕见，但目前的事件是过去1200年来最严重的干旱，单年（2014年）和累积水分亏缺比以往任何连续干旱年都要严重。贯穿2014年生长季的树木年轮年表显示，干旱期间的降水量非常低，但并没有超出自然变化的范围。目前的加州干旱是异常严重的背景下，至少在过去的一千年，是由减少，但不是前所未有的降水和创纪录的高温。
For the past three years (2012-2014), California has experienced the most severe drought conditions in its last century. But how unusual is this event? Here we use two paleoclimate reconstructions of drought and precipitation for Central and Southern California to place this current event in the context of the last millennium. We demonstrate that while 3 year periods of persistent below-average soil moisture are not uncommon, the current event is the most severe drought in the last 1200 years, with single year (2014) and accumulated moisture deficits worse than any previous continuous span of dry years. Tree ring chronologies extended through the 2014 growing season reveal that precipitation during the drought has been anomalously low but not outside the range of natural variability. The current California drought is exceptionally severe in the context of at least the last millennium and is driven by reduced though not unprecedented precipitation and record high temperatures.