Zhang Aoxing, Wang Yuhang, Zou Yufei
School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA.
Now at State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, China.
iScience. 2023 Nov 23;26(12):108533. doi: 10.1016/j.isci.2023.108533. eCollection 2023 Dec 15.
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.
区域气候对野火的发生有很强的调节作用，部分原因是燃料负荷的干燥会增加火灾。野火释放的大量气溶胶也会对区域气候产生强烈影响。在这里，我们展示了在使用社区地球系统模型（CESM）中的交互式区域特定生态系统反馈火灾（RESFire）模型进行的模拟中，由于非洲野火气溶胶强迫而产生的正反馈（季节性燃烧面积增加7%-17%）。这种正反馈部分源于火灾气溶胶从燃烧（干燥）区域向湿润区域的传输，减少了降水并使燃料负荷干燥，从而增强了向非燃烧（湿润）区域的火灾。这种内部自我增强的燃烧是调节非洲生态系统以及理解气候变化下非洲火灾行为的重要机制。类似的机制也可能有助于维持其他热带地区的野火。
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