气候变化领域集成服务门户(CCPortal): Land and Atmosphere Precursors to Fuel Loading, Wildfire Ignition and Post-Fire Recovery

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DOI	10.1029/2023GL105324
	Land and Atmosphere Precursors to Fuel Loading, Wildfire Ignition and Post-Fire Recovery
	Alizadeh, Mohammad Reza; Adamowski, Jan; Entekhabi, Dara
发表日期	2024
ISSN	0094-8276
EISSN	1944-8007
起始页码	51
结束页码	2
卷号	51 期号:2
英文摘要	Land surface-atmosphere coupling and soil moisture memory are shown to combine into a distinct temporal pattern for wildfire incidents across the western United States. We investigate the dynamic interplay of observed soil moisture, vegetation water content, and atmospheric dryness in relation to fuel loading, fire ignition and post-fire recovery. We find that positive soil moisture anomalies around 5 months before fire ignition increase biomass growth in the subsequent months, thereby shaping fire-prone vegetation conditions. Then, concurrent decrease in soil moisture, vegetation dehydration, and atmospheric dryness collectively contribute to the occurrence of fire ignition events. This is followed by a rapid recovery in both soil and atmospheric moisture within several weeks after the fire incidents. Our findings provide insights into understanding of wildfire ignition dynamics, supporting fire modeling and enabling improved fire predictions, early warning systems, and mitigation strategies. We find that wildfire are part of a distinct temporal pattern of soil moisture, vegetation water content and atmospheric dryness dynamics that begin about 5 months before the incidents. We analyze anomalies in soil moisture, vegetation water content, vapor pressure deficit and precipitation before and after large wildfires during the warm season across various US climate regions. We document distinct patterns in soil aridity and atmospheric dryness, fuel load, and vegetation dehydration that contribute to the occurrence of wildfires. Our observation-based analyses show that soil moisture anomalies significantly control the growth of biomass several months before the fire occurrence, which in turn affects the availability of fire fuel. Notable dry anomalies with fuel accumulation in the dry western climate regions are observed approximately 4 to 5 months before the fires, followed by a quick recovery trend several weeks after the fire in wet regions. Our results indicate that in the majority of the climate regions, there are significant dry anomalies preceding the occurrence of wildfires. Understanding the dynamics of these environmental variables can be the basis for improved wildfire hazard predictions and mitigation strategies. Wetter-than-average soil moisture 4-5 months before wildfires results in increased aboveground biomass accumulationSoil moisture decrease and atmospheric drying after peak biomass lead to dry fuel availability at the time of wildfire ignitionThe temporal pattern is evident in mapped data on soil moisture, vegetation water content and wildfire incidents across western United States
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001144659900001
来源期刊	GEOPHYSICAL RESEARCH LETTERS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/305250
作者单位	Massachusetts Institute of Technology (MIT); McGill University
推荐引用方式 GB/T 7714	Alizadeh, Mohammad Reza,Adamowski, Jan,Entekhabi, Dara. Land and Atmosphere Precursors to Fuel Loading, Wildfire Ignition and Post-Fire Recovery[J],2024,51(2).
APA	Alizadeh, Mohammad Reza,Adamowski, Jan,&Entekhabi, Dara.(2024).Land and Atmosphere Precursors to Fuel Loading, Wildfire Ignition and Post-Fire Recovery.GEOPHYSICAL RESEARCH LETTERS,51(2).
MLA	Alizadeh, Mohammad Reza,et al."Land and Atmosphere Precursors to Fuel Loading, Wildfire Ignition and Post-Fire Recovery".GEOPHYSICAL RESEARCH LETTERS 51.2(2024).