Climate feedback of forest fires amplified by atmospheric chemistry

Research Square (Research Square), Год журнала: 2025, Номер unknown

Опубликована: Янв. 21, 2025

Intensified forest wildfires, driven by climate change, release reactive gases that lead to reduced atmospheric oxidation capacity, hence increasing methane levels and amplifying warming. Our integrated analysis of fire chemistry models projects additional warming this mechanism rivals wetland feedback CO₂ the 2050s under intermediate pathway. finding highlights a critical role in regulating fire-climate feedback.

Язык: Английский

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How Do Emission Factors Contribute to the Uncertainty in Biomass Burning Emissions in the Amazon and Cerrado?

Atmosphere, Год журнала: 2025, Номер 16(4), С. 423 - 423

Опубликована: Апрель 4, 2025

Fires drive global ecosystem change, impacting carbon dynamics, atmospheric composition, biodiversity, and human well-being. Biomass burning, a major outcome of fires, significantly contributes to greenhouse gas aerosol emissions. Among these, fine particulate matter (PM2.5) is particularly concerning due its adverse effects on air quality health, substantial yet uncertain role in Earth’s energy balance. Variability emission factors (EFs) remains key source uncertainty estimates. This study evaluates PM2.5 sensitivity EFs variability Brazil’s Amazon Cerrado biomes over 2002–2023 using the 3BEM_FRP model implemented PREP-CHEM-SRC tool. We updated with values ranges from Andreae (2019), which reflect more comprehensive literature review than earlier datasets. The results reveal that annual average emissions varied by up 162% (1213 Gg yr−1 3172 yr−1) 184% (601 1709 yr−1). Average peak at grid-cell level reached 5688 Mg “Arc Deforestation” region under High-end EF scenario. Notably, forest areas increased time despite shrinking cover, indicating Amazonian forests are becoming vulnerable fire. In Cerrado, savannas primary land cover contributing total emissions, accounting for 64% 80%. These findings underscore importance accurate, region-specific improving models reducing uncertainties.

Язык: Английский

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Compounding effects of climate change and WUI expansion quadruple the likelihood of extreme-impact wildfires in California

npj natural hazards., Год журнала: 2025, Номер 2(1)

Опубликована: Фев. 21, 2025

Abstract Previous research has examined individual factors contributing to wildfire risk, but the compounding effects of these remain underexplored. Here, we introduce “Integrated Human-centric Wildfire Risk Index (IHWRI)” quantify fire-weather intensification and anthropogenic factors—including ignitions human settlement into wildland—on risk. While climatic trends increased frequency high-risk by 2.5-fold, combination this trend with wildland-urban interface expansion led a 4.1-fold increase in conditions conducive extreme-impact wildfires from 1990 2022 across California. More than three-quarters wildfires—defined as top 20 largest, most destructive, or deadliest events on record—originated within 1 km interface. The destructive wildfires—90% which were human-caused—primarily occurred fall, while largest wildfires—56% human-caused—mostly took place summer. By integrating activity climate change impacts, provide holistic understanding human-centric crucial for policy development.

Язык: Английский

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Exploring the effects of wildfire events on movement patterns

Applied Geography, Год журнала: 2025, Номер 179, С. 103602 - 103602

Опубликована: Апрель 14, 2025

Язык: Английский

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