2024-01-03 ジョージア工科大学
◆エアロゾルの役割は気候に複雑で、アフリカの独特な乾季と雨季の交互により、エアロゾルの寿命が延びている。これにより、気温上昇と乾燥した気候が将来的にアフリカでより持続的な焼失を引き起こす可能性が示唆された。
＜関連情報＞
- https://research.gatech.edu/everlasting-african-wildfires-fueled-aerosol-feedback
- https://www.cell.com/iscience/fulltext/S2589-0042(23)02610-X
地域気候への正のフィードバックがアフリカの山火事を促進 Positive feedback to regional climate enhances African wildfires
Aoxing Zhang,Yuhang Wang,Yufei Zou
iScience Published:November 22, 2023
DOI:https://doi.org/10.1016/j.isci.2023.108533
Highlights
•The coupled CESM-RESFire model was applied to study fire aerosol feedback in Africa
•Aerosol-climate interactions fuel self-reinforcing Africa wildfires
•Dry-to-wet regional transport of fire aerosols elevates subsequent-season fires
Summary
Regional climate strongly regulates the occurrence of wildfires partly because drying of fuel load increases fires. The large amounts of aerosols released by wildfires can also strongly affect regional climate. Here we show positive feedback (a seasonal burned area enhancement of 7–17%) due to wildfire aerosol forcing in Africa found in the simulations using the interactive REgion-Specific ecosystem feedback Fire (RESFire) model in the Community Earth System Model (CESM). The positive feedback results partly from the transport of fire aerosols from burning (dry) to wet regions, reducing precipitation and drying fuel load to enhance fires toward the non-burning (wet) region. This internally self-enhanced burning is an important mechanism for the regulation of African ecosystems and for understanding African fire behaviors in a changing climate. A similar mechanism may also help sustain wildfires in other tropical regions.
Graphical abstract
