气候变化领域集成服务门户(CCPortal): Meteorological Environments Associated With California Wildfires and Their Potential Roles in Wildfire Changes During 1984

CCPortal

DOI	10.1029/2020JD033180
	Meteorological Environments Associated With California Wildfires and Their Potential Roles in Wildfire Changes During 1984–2017
	Dong L.; Leung L.R.; Qian Y.; Zou Y.; Song F.; Chen X.
发表日期	2021
ISSN	2169897X
卷号	126 期号:5
英文摘要	California has experienced more wildfires in recent years, resulting in huge economic losses and threatening human health. Clarifying the meteorological environments of wildfires is foundational to improving the understanding and prediction of wildfires and their impacts. Here, 1,535 California wildfires during 1984–2017 are systematically investigated. Based on two key meteorological factors—temperature and moisture anomalies—all wildfires are classified into four groups: hot-dry, hot-wet, cold-dry, cold-wet. Most (∼60%) wildfires occurred on hot-dry days. Compositing the meteorological environments of the four groups shows that persistent high pressure and strong northeasterly wind descending from inland favor hot-dry conditions for wildfires. Self-organizing map analysis lends confidence in the large-scale meteorological pattern dominating hot-dry wildfires in California. Meteorological anomalies also influence wildfire size through their magnitudes, with moisture anomaly explaining the largest fraction (∼69%) of variability in wildfire sizes. In addition, 12.2% of wildfires occurred on hot-wet days, which may be related with lightning flashes. More lightning tends to trigger wildfires, but the wet condition helps to suppress the wildfire sizes. Total burned area by wildfires has significantly increased by ∼3.6% per year, indicating a doubling of burned area in 2017 relative to 1984, mainly dominated by hot-dry wildfires in summer. Drying and warming in conjunction with strengthening of the high pressure in summer and fall have the potential to support more frequent and larger hot-dry wildfires in California during the past several decades. © 2021. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185443
作者单位	Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, United States
推荐引用方式 GB/T 7714	Dong L.,Leung L.R.,Qian Y.,等. Meteorological Environments Associated With California Wildfires and Their Potential Roles in Wildfire Changes During 1984–2017[J],2021,126(5).
APA	Dong L.,Leung L.R.,Qian Y.,Zou Y.,Song F.,&Chen X..(2021).Meteorological Environments Associated With California Wildfires and Their Potential Roles in Wildfire Changes During 1984–2017.Journal of Geophysical Research: Atmospheres,126(5).
MLA	Dong L.,et al."Meteorological Environments Associated With California Wildfires and Their Potential Roles in Wildfire Changes During 1984–2017".Journal of Geophysical Research: Atmospheres 126.5(2021).