Transport of smoke from Canadian forest fires to the surface near Washington, D. C.: Injection height, entrainment, and optical properties
Transport of smoke from Canadian forest fires to the surface near Washington, D. C.: Injection height, entrainment, and optical properties
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DOI：
10.1029/2003jd004248
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发表时间：
2004-03-19
影响因子：
4.4
通讯作者：
Welton, EJ
中科院分区：
文献类型：
--
作者：
Colarco, PR;Schoeberl, MR;Welton, EJ
[1] 加拿大森林火灾产生的烟雾和污染物有时会在前进的冷锋后面的低海拔地区输送到美国上空。 2002 年 7 月发生了一起不寻常的事件，卫星、激光雷达和飞机观测到魁北克火灾产生的烟雾到达华盛顿特区的高空地区。这些升高的烟羽随后被夹带到湍流的行星边界层中，混合到地表，对该地区的地表空气质量产生不利影响。轨迹和三维模型计算证实了烟雾的来源、其在高空的输送以及将污染物带到地表的机制。此外，假设烟雾颗粒在模型中通过凝结而老化，则建模的烟雾光学特性与飞机和遥感观测结果非常吻合。这些结果对于污染物的长距离迁移及其随后夹带到地表，以及北方森林火灾烟雾的光学特性的演变具有重要意义。
[1] Smoke and pollutants from Canadian forest fires are sometimes transported over the United States at low altitudes behind advancing cold fronts. An unusual event occurred in July 2002 in which smoke from fires in Quebec was observed by satellite, lidar, and aircraft to arrive over the Washington, D. C., area at high altitudes. This elevated smoke plume subsequently mixed to the surface as it was entrained into the turbulent planetary boundary layer and had adverse effects on the surface air quality over the region. Trajectory and three-dimensional model calculations confirmed the origin of the smoke, its transport at high altitudes, and the mechanism for bringing the pollutants to the surface. Additionally, the modeled smoke optical properties agreed well with aircraft and remote sensing observations provided the smoke particles were allowed to age by coagulation in the model. These results have important implications for the long-range transport of pollutants and their subsequent entrainment to the surface, as well as the evolving optical properties of smoke from boreal forest fires.