The impact of aged wildfire smoke on atmospheric composition and ozone in the Colorado Front Range in summer 2015
The impact of aged wildfire smoke on atmospheric composition and ozone in the Colorado Front Range in summer 2015
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2015 年夏季，古老的野火烟雾对科罗拉多州前沿山脉大气成分和臭氧的影响
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发表时间：
2017
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影响因子：
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通讯作者：
E. Fischer
中科院分区：
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作者：
J. Lindaas;D. Farmer;I. Pollack;A. Abeleira;F. Flocke;Rob Roscioli;S. Herndon;E. Fischer
野火烟雾对美国西部空气质量的相对重要性预计将随着气候变暖和人为排放的下降而增加。我们报告在原位测量臭氧（O 3），一套挥发性有机化合物（VOCs），和活性氧化氮物种收集在2015年夏天在博尔德大气观测站（BAO）在伊利，CO。老化野火烟雾影响BAO在两个不同的时间段在2015年夏天：6-10 7月和16-30 8月。烟雾从太平洋西北部和加拿大穿越美国大陆的大部分地区。一氧化碳和颗粒物在烟雾影响期间增加，沿着过氧酰基硝酸盐和几种挥发性有机化合物的大气寿命长于烟雾的运输时间。在八月受烟雾影响期间，与无烟期间相比，二氧化氮在早上和晚上也升高。在我们的研究期间，有六天在BAO的最大8小时平均O3大于65 ppbv，其中两天受到烟雾的影响。我们研究了在BAO的O3和温度之间的关系，并发现，对于一个给定的温度，O3的混合比更大（~ 10 ppbv）在烟雾影响期间。增强O 3在8月烟雾影响期间也观察到在两个长期监测站点在科罗拉多：落基山国家公园和阿拉帕霍国家野生动物保护区附近的瓦尔登，CO。我们的数据提供了一个新的案例研究如何老化野火烟雾可以影响大气成分在城市网站，以及烟雾如何可以有助于增加O 3丰度在城乡梯度。
The relative importance of wildfire smoke for air quality over the western U.S. is expected to increase as the climate warms and anthropogenic emissions decline. We report on in situ measurements of ozone (O 3 ), a suite of volatile organic compounds (VOCs), and reactive oxidized nitrogen species collected during summer 2015 at the Boulder Atmospheric Observatory (BAO) in Erie, CO. Aged wildfire smoke impacted BAO during two distinct time periods during summer 2015: 6–10 July and 16–30 August. The smoke was transported from the Pacific Northwest and Canada across much of the continental U.S. Carbon monoxide and particulate matter increased during the smoke-impacted periods, along with peroxyacyl nitrates and several VOCs that have atmospheric lifetimes longer than the transport timescale of the smoke. During the August smoke-impacted period, nitrogen dioxide was also elevated during the morning and evening compared to the smoke-free periods. There were six days during our study period where the maximum 8-hour average O 3 at BAO was greater than 65 ppbv, and two of these days were smoke-impacted. We examined the relationship between O 3 and temperature at BAO and found that for a given temperature, O 3 mixing ratios were greater (~ 10 ppbv) during the smoke-impacted periods. Enhancements in O 3 during the August smoke-impacted period were also observed at two long-term monitoring sites in Colorado: Rocky Mountain National Park and the Arapahoe National Wildlife Refuge near Walden, CO. Our data provide a new case study of how aged wildfire smoke can influence atmospheric composition at an urban site, and how smoke can contribute to increased O 3 abundances across an urban-rural gradient.