Wang Yungang, Hopke Philip K, Rattigan Oliver V, Zhu Yifang
Center for Air Resource Engineering and Science, Clarkson University, Potsdam, NY 13699-5708, USA.
J Environ Monit. 2011 Jul;13(7):1919-26. doi: 10.1039/c1em10117j. Epub 2011 May 23.
Previously it has been suggested that certain organic aerosol components of wood smoke have enhanced ultraviolet absorption at 370 nm relative to 880 nm in two-wavelength aethalometer measurements. This enhanced absorption could serve as an indicator of wood burning particles. Two-wavelength (370 nm and 880 nm) aethalometer measurements were made at urban sites in Rochester, New York and Laredo, Texas from August 1 to December 31, 2009 and from December 23, 2007 to January 2, 2008, respectively. In Rochester, Delta-C (UVBC(370 nm)- BC(880 nm)) values were higher by a factor of 3 during the night than during the day in November and December when residential wood burning was common. In Laredo, particularly high Delta-C values were observed on Christmas Eve and New Year's Eve and were attributed to biomass burning and firework emissions. Exponential decay was found to be a good estimator for predicting BC concentrations at different wind speeds regardless of wind directions.
此前有人提出，在双波长黑碳仪测量中，木烟中的某些有机气溶胶成分在370纳米处的紫外线吸收相对于880纳米有所增强。这种增强的吸收可作为木材燃烧颗粒的一个指标。分别于2009年8月1日至12月31日以及2007年12月23日至2008年1月2日在纽约罗切斯特和得克萨斯州拉雷多的城市地点进行了双波长（370纳米和880纳米）黑碳仪测量。在罗切斯特，11月和12月居民普遍燃烧木材时，夜间的Δ-C（UVBC(370纳米)-BC(880纳米)）值比白天高3倍。在拉雷多，平安夜和新年前夜观测到特别高的Δ-C值，这归因于生物质燃烧和烟花排放。结果发现，无论风向如何，指数衰减都是预测不同风速下黑碳浓度的良好估计方法。
