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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：浓烟引起的浓烟流导致大火附近的意外烟气传输

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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：提出了由大型野火引起的烟感密度流的首次观测。使用新颖的移动多普勒激光雷达和其他原位测量，我们记录了深（约2 km）的烟雾浓密电流，在北部北部一场大森林大火附近以超过4.5ms（-1）的速度传播了超过25 km加利福尼亚基于这些观察结果，我们表明，控制烟层扩散的动力学是由大气边界层的烟气填充部分和无烟部分之间的不同太阳能加热引起的。理论密度电流速度的计算与观察到的传播速度非常吻合。附加的激光雷达和其他烟雾密集流的照相记录表明，这些先前未知的现象在大型野火附近相对普遍，并且可能导致人口稠密地区发生严重的意外烟雾。

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