Investigation of formaldehyde sources and its relative emission intensity in shipping channel environment  

作　　者：Jiaqi Liu Shanshan Wang Yan Zhang Yuhao Yan Jian Zhu Sanbao Zhang Tianyu Wang Yibing Tan Bin Zhou 

机构地区：[1]Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3),Department of Environmental Science and Engineering,Fudan University,Shanghai 200433,China [2]Institute of Eco-Chongming(IEC),No.20 Cuiniao Road,Shanghai 202162,China [3]Institute of Atmospheric Sciences,Fudan University,Shanghai 200433,China [4]National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary,Fudan University,Shanghai 200438,China [5]Institute of Digitalized Sustainable Transformation,Big Data Institute,Fudan University,Shanghai 200433,China

出　　处：《Journal of Environmental Sciences》2024年第8期142-154,共13页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21976031,42075097,42077195,22176037);the Key-Area Research and Development Program of Guangdong Province(No.2020B1111360001)。

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 about2.5 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 O_(x)(NO_(2)+O_(3))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±2.04ppbv)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/NO_(2)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/NO_(2)levels.With the knowledge of NO_(2)(or NO_(x))emission levels from ships,this study may provide data support for the establishment of HCHO emission factors.

关 键 词：HCHO LP-DOAS Channel environment Ship emissions 

分 类 号：X51[环境科学与工程—环境工程] X736.1