异戊二烯
环境科学
环境化学
臭氧
弹簧(装置)
挥发性有机化合物
傍晚
反应性(心理学)
早晨
大都市区
季节性
大气科学
水文学(农业)
化学
地理
气象学
生态学
地质学
考古
病理
聚合物
替代医学
岩土工程
有机化学
天文
工程类
内科学
物理
生物
机械工程
医学
共聚物
作者
A. Abeleira,I. B. Pollack,B. C. Sive,Yong Zhou,Emily V. Fischer,Delphine K. Farmer
摘要
Abstract Hourly measurements of 46 volatile organic compounds (VOCs) from the Boulder Atmospheric Observatory in Erie, CO, were collected over 16 weeks in spring and summer 2015. Average VOC reactivity (1.2 s −1 in spring and 2.4 s −1 in summer) was lower than most other U.S. urban sites. Positive matrix factorization analysis identified five VOC factors in the spring, corresponding to sources from (1) long‐lived oil and natural gas (ONG‐long lived), (2) short‐lived oil and natural gas (ONG‐short lived), (3) traffic, (4) background, and (5) secondary chemical production. In the summer, an additional biogenic factor was dominated by isoprene. While ONG‐related VOCs were the single largest contributor (40–60%) to the calculated VOC reactivity with hydroxyl radicals (OH) throughout the morning in both spring and summer, the biogenic factor substantially enhanced afternoon and evening (2–10 P.M. local time) VOC reactivity (average of 21%; maxima of 49% of VOC reactivity) during summertime. These results contrast with a previous summer 2012 campaign which showed that biogenics contributed only 8% of VOC reactivity on average. The interannual differences suggest that the role of biogenic VOCs in the Colorado Northern Front Range Metropolitan Area (NFRMA) varies with environmental conditions such as drought stress. Overall, the NFRMA was more strongly influenced by ONG sources of VOCs than other urban and suburban regions in the U.S.
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