Source and variability of formaldehyde in the Fenwei Plain:An integrated multi-source satellite and emission inventory study  

作　　者：Liang Li Keqin Duan Yuyao Wu Junhua Yang Ting Yang Peihong Shi Rong Chen 

机构地区：[1]School of Geography and Tourism,Shaanxi Normal University,Xi’an 710000,China [2]College of Geography and Environmental Science,Northwest Normal University,Lanzhou 730000,China [3]State Key Laboratory of Cryospheric Sciences(SKLC),Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [4]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China

出　　处：《Journal of Environmental Sciences》2025年第4期254-266,共13页环境科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.41571062);the Fundamental Research Funds for the Central Universities(No.2021TS014);the Natural Science Basic Research Plan in Shaanxi Province of China(No.2023-JC-YB-259).

摘　　要：Formaldehyde(HCHO)is a high-yield product of the oxidation of volatile organic compounds(VOCs)released by anthropogenic activities,fires,and vegetations.Hence,we examined the spatiotemporal variation trends in HCHO columns observed using the Ozone Monitoring Instrument(OMI)during 2005–2021 across the Fenwei Plain(FWP)and analysed the source and variability of HCHO using multi-source data,such as thermal anomalies.The spatial distribution of the annualmean HCHO in the FWP increased from northwest to southeast during 2005–2021,and the high-value aggregation areas contracted and gradually clustered,forming a belt-shaped distribution area from Xi’an to Baoji,north of the Qinling Mountains.The annual mean HCHO concentration generally showed a two-step increase over the 17 years.Fires showed a single-peak trend in March and a double-peak M-shaped trend in March and October,whereas urban thermal anomalies(UTAs)showed an inverted U-shaped trend over 17 years,with peaks occurring in May.The HCHO peaks are mainly caused by the alternating contributions of fires and UTAs.The fires and UTAs(predominantly industrial heat sources)played a role in controlling the background level of HCHO in the FWP.Precipitation and temperature were also important influencing variables for seasonal variations,and the influence of plant sources on HCHO concentrations had significant regional characteristics and contributions.In addition,the FWP has poor dispersion conditions and is an aggregated area for the long-range transport of air pollutants.

关 键 词：OMI HCHO Urban thermal anomalies(UTAs) Fires ISOPRENE 

分 类 号：O64[理学—物理化学]