Recurrent pattern of extreme fire weather in California

Recurrent pattern of extreme fire weather in California
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加州极端火灾天气反复出现

DOI:
10.1088/1748-9326/ac1f44
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发表时间:
2021
影响因子:
6.7
通讯作者:
Yoon, Jin-Ho
Yoon, Jin-Ho
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Son, Rackhun;Wang, S-Y Simon;Kim, Seung Hee;Kim, Hyungjun;Jeong, Jee-Hoon;Yoon, Jin-Ho

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加州历史上的野火事件显示出每五到七年发生一次的趋势,近几十年来有迅速增加的趋势。这种振荡在多个历史气候记录中很明显,有些记录长达世纪,而且似乎还在继续。分析表明,这种5-7年振荡与海洋和大气中一系列向东传播的异常大尺度气候型有关。虽然从北方中太平洋到加州西海岸出现了更温暖的温度,但拉尼娜现象同时发展,这意味着需要多年才能形成的厄尔尼诺-南方涛动的生命周期可能是一个触发因素。太平洋-北美大气遥相关的演变模式表明了热带和副热带强迫在这一生命周期中的作用。这些结果突出了半周期性水文行为作为气候驱动因子的野火变化在加州。
Historical wildfire events in California have shown a tendency to occur every five to seven years with a rapidly increasing tendency in recent decades. This oscillation is evident in multiple historical climate records, some more than a century long, and appears to be continuing. Analysis shows that this 5–7 year oscillation is linked to a sequence of anomalous large-scale climate patterns with an eastward propagation in both the ocean and atmosphere. While warmer temperature emerges from the northern central Pacific to the west coast of California, La Niña pattern develops simultaneously, implying that the lifecycle of the El Niño-Southern Oscillation that takes multiple years to form could be a trigger. The evolving patterns of the Pacific-to-North America atmospheric teleconnection suggest the role of tropical and subtropical forcing embedded in this lifecycle. These results highlight the semi-cyclical hydrological behavior as a climate driver for wildfire variability in California.
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