A case study of aerosol scavenging in a biomass burning plume over eastern Canada during the 2011 BORTAS field experiment
A case study of aerosol scavenging in a biomass burning plume over eastern Canada during the 2011 BORTAS field experiment
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DOI：
10.5194/acp-14-8449-2014
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发表时间：
2014-01-01
影响因子：
6.3
通讯作者：
Saha, A.
中科院分区：
文献类型：
--
作者：
Franklin, J. E.;Drummond, J. R.;Saha, A.
我们目前的远程烟雾传输事件的测量记录于2011年7月20日至21日在哈利法克斯，新斯科舍省，加拿大，在量化的影响北方森林火灾对流层氧化剂在大西洋使用飞机和卫星（BORTAS-B）活动。基于地面的傅里叶变换光谱仪和光度计检测到的空气质量与大荒地火灾燃烧在东部马尼托巴和西部安大略。我们调查了一个羽流高微量气体量，但低量的颗粒之前，并重叠在哈利法克斯网站与第二羽流高微量气体负载和大量的颗粒物质。我们表明，第一羽经历了气象清除事件，但第二羽没有类似的清除。这表明，在考虑远距离迁移时，有必要仔细考虑羽流的历史，因为同时或几乎同时到达的时间不一定表明轨迹或气象历史相似。我们调查的起源清除羽，气溶胶湿沉积事件发生在羽流类似的24小时之前，在哈利法克斯的测量的可能性。目前的观测网络只能间歇性地监测放样和清除的区域，因此我们必须考虑许多不同的证据，以了解羽流的早期动态。通过这一讨论，我们还证明了同时进行许多遥感测量的价值，以了解生物质燃烧羽流的物理和化学行为。
We present measurements of a long-range smoke transport event recorded on 20-21 July 2011 over Halifax, Nova Scotia, Canada, during the Quantifying the impact of BOReal forest fires on Tropospheric oxidants over the Atlantic using Aircraft and Satellites (BORTAS-B) campaign. Ground-based Fourier transform spectrometers and photometers detected air masses associated with large wild-land fires burning in eastern Manitoba and western Ontario.We investigate a plume with high trace gas amounts but low amounts of particles that preceded and overlapped at the Halifax site with a second plume with high trace gas loadings and significant amounts of particulate material. We show that the first plume experienced a meteorological scavenging event, but the second plume had not been similarly scavenged. This points to the necessity to account carefully for the plume history when considering long-range transport since simultaneous or near-simultaneous times of arrival are not necessarily indicative of either similar trajectories or meteorological history. We investigate the origin of the scavenged plume, and the possibility of an aerosol wet deposition event occurring in the plume similar to 24 h prior to the measurements over Halifax. The region of lofting and scavenging is only monitored on an intermittent basis by the present observing network, and thus we must consider many different pieces of evidence in an effort to understand the early dynamics of the plume. Through this discussion we also demonstrate the value of having many simultaneous remote-sensing measurements in order to understand the physical and chemical behaviour of biomass burning plumes.