差分吸收光谱
甲醛
羽流
频道(广播)
环境科学
大气科学
小学(天文学)
臭氧
氮氧化物
气象学
环境化学
吸收(声学)
化学
物理
天体物理学
光学
电信
燃烧
工程类
有机化学
作者
Jiaqi Liu,Shanshan Wang,Yan Zhang,Yuhao Yan,Jinying Zhu,Sanbao Zhang,T. T. Wang,Yongbo Tan,Bin Zhou
标识
DOI:10.1016/j.jes.2023.06.020
摘要
Formaldehyde (HCHO) is considered one of the most abundant gas-phase carbonyl compounds in the atmosphere, which can be directly emitted through transportation sources. Long-Path Differential Optical Absorption Spectroscopy (LP-DOAS) was used to observe HCHO in the river channel of Wusong Wharf in Shanghai, China for the whole year of 2019. Due to the impact of ship activity, the annual average HCHO level in the channel is about 2.5 times higher than that in the nearby campus environment. To explain the sources of HCHO under different meteorological conditions, the tracer-pair of CO and Ox (NO2+O3) was used on the clustered air masses. The results of the source appointment show that primary, secondary and background account for 24.14% (3.34 ± 1.19 ppbv), 44.78% (6.20 ± 2.04 ppbv) and 31.09% (4.31 ± 2.33 ppbv) of the HCHO in the channel when the air masses were from the mixed direction of the city and channel, respectively. By performing background station subtraction at times of high primary HCHO values and resolving the plume peaks, directly emitted HCHO/NO2 in the channel environment and plume were determined to be mainly distributed between 0.2 and 0.3. General cargo ships with higher sailing speeds or main engine powers tend to have higher HCHO/NO2 levels. With the knowledge of NO2 (or NOX) emission levels from ships, this study may provide data support for the establishment of HCHO emission factors.
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