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2003年至2022年间北极boreal火灾强度的趋势和驱动因素
Yanxi Li1, Thomas A J Janssen2, Rui Chen3
1School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu, Sichuan, China; Faculty of Science, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands.
The Science of the total environment
|March 28, 2024
概括
气候变化正在增加欧亚北极森林的火灾强度,但不是在北美. 火焰辐射功率 (FRP) 的增加与温度升温和干燥条件有关,这对生态系统和碳排放有重大影响.
科学领域:
- 生态与环境科学 生态与环境科学
- 气候变化研究 气候变化研究
- 遥感应用 遥感应用
背景情况:
- 由于气候变化,北极 boreal 生态系统经历了放大升温.
- 最近的变暖和干燥导致这些地区的火灾活动和碳排放增加.
- 虽然被烧毁区域的趋势已被记录,但火灾强度的变化仍然不太了解.
研究的目的:
- 通过使用卫星数据,调查北极北极地区火灾强度的趋势.
- 为了比较欧亚和北美北极森林之间的火灾强度变化.
- 为了确定导致火灾强度观察到变化的因素.
主要方法:
- 使用来自中等分辨率成像光谱辐射仪 (MODIS) 的活性火产物进行火辐射功率 (FRP) 分析.
- 从2003年到2022年,在整个北极-北极地区检查了FRP的年均中位数趋势.
- 与气候变量相关的FRP趋势包括空气温度,蒸汽压力赤字,火灾天气和燃料可用性.
主要成果:
- 在2003年至2022年期间,欧亚北方森林在白天和夜间的火灾中,每年平均火灾强度 (FRP) 显著增加.
- 在同一时期,北美北极地区没有观察到FRP的一般趋势.
- 欧亚洲的FRP增加与空气温度上升,蒸汽压力赤字,火灾天气和燃料可用性密切相关.
结论:
- 气候变化明显增加了欧亚中部和东部地区的火灾强度,较高的温度与更高的FRP相关.
- 北美北极北极地区的火灾强度趋势从数据中不能清楚地辨别出来.
- 持续的气候变化可能会导致北极北极火灾的强度进一步增加,可能会改变火灾制度,碳循环和社会影响.
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