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首页> 外文期刊>Atmospheric chemistry and physics >Cold Smoke: smoke-induced density currents cause unexpected smoke transport near large wildfires
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Cold Smoke: smoke-induced density currents cause unexpected smoke transport near large wildfires

机译：冷烟：烟雾诱导的密度电流导致大型野火附近意外的烟雾运输

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摘要

The first observations of smoke-induced density currents originating from large wildfires are presented. Using a novel mobile Doppler lidar and additional in situ measurements, we document a deep (similar to 2 km) smoke-filled density current that propagates more than 25 km at speeds up to 4.5ms(-1) near a large forest fire in northern California. Based on these observations we show that the dynamics governing the spread of the smoke layer result from differential solar heating between the smoke-filled and smoke-free portions of the atmospheric boundary layer. A calculation of the theoretical density current speed agrees well with the observed propagation speed. Additional lidar and photographic documentation of other smoke-filled density currents demonstrate that these previously unknown phenomena are relatively common near large wildfires and can cause severe and unexpected smoke inundation of populated areas.
机译：提出了源自大型野火的烟雾诱导的密度电流的首次观察。 使用新型移动多普勒利达和额外的原位测量，我们记录了一个深（类似于2公里）的烟雾填充密度电流，在北部的大型森林火灾附近速度超过4.5ms的速度传播超过25 km的速度超过4.5ms（-1） 加利福尼亚。 基于这些观察，我们表明，控制烟雾层的扩散的动态由大气边界层的烟雾填充和无烟部分之间的差动太阳能加热产生。 理论密度电流速度的计算与观察到的传播速度很好。 其他烟雾填充密度电流的额外激光雷达和照相文件证明，这些先前未知的现象在大型野火附近相对普遍，可能导致人口稠密地区严重和意外的烟雾淹没。

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