| Title: | Summertime high resolution variability of atmospheric formaldehyde and non-methane volatile organic compounds in a rural background area |
| Author(s): | de Blas M; Ibanez P; Garcia JA; Gomez MC; Navazo M; Alonso L; Durana N; Iza J; Gangoiti G; de Camara ES; |
| Address: | "Faculty of Engineering - Bilbao, University of the Basque Country UPV/EHU, Spain. Electronic address: maite.deblas@ehu.eus. Faculty of Engineering - Bilbao, University of the Basque Country UPV/EHU, Spain. Faculty Engineering of Vitoria-Gasteiz, University of the Basque Country UPV/EHU, Spain" |
| DOI: | 10.1016/j.scitotenv.2018.07.411 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "On rural background areas atmospheric formaldehyde (HCHO) is important for its abundance and chemical reactivity, directly linked to the tropospheric ozone formation processes. HCHO is also toxic and carcinogenic to humans. Atmospheric HCHO was continuously measured in summer 2016 during 81?ª+days (N?ª+=?ª+6722, average: 1.42?ª+ppbv) in a rural background area in Northern Spain, Valderejo Natural Park (VNP) using a Hantzsch fluorimetric system. To better characterize the photochemical processes the database was completed with hourly measurements of 63 Non-Methane Hydrocarbons (NMHC) performed by gas chromatography and other common atmospheric pollutants and meteorological parameters. HCHO mixing ratios were highly correlated with ozone and isoprene. Cloudy and rainy days, with low temperature and radiation, led to low HCHO mixing ratios, with maxima (<2?ª+ppbv) registered around 14 UTC. On days with increased radiation and temperature HCHO maxima occurred slightly later (<6?ª+ppbv, approximately 16:00 UTC). During clear summer days with high temperature and radiation, two HCHO peaks were registered daily, one synchronized with the radiation maximum ( approximately 3-4?ª+ppbv, approximately 13:00 UTC) and an absolute maximum (<10?ª+ppbv, approximately 18:00 UTC), associated with the addition of HCHO coming into VNP due to inbound transport of old polluted air masses. In the ozone episode studied, the processes of accumulation and recharge of ozone and of HCHO ran in parallel, leading to similar daily patterns of variation. Finally, HCHO mixing ratios measured in VNP were compared with other measurements at rural, forested, and remote sites all over the world, obtaining similar values" |
| Keywords: | Biogenic Volatile Organic Compounds (BVOCs) Formaldehyde Hantzsch fluorimetry Non methane hydrocarbons (NMHC) Rural background Tropospheric ozone; |
| Notes: | "PubMed-not-MEDLINEde Blas, Maite Ibanez, Pablo Garcia, Jose Antonio Gomez, Maria Carmen Navazo, Marino Alonso, Lucio Durana, Nieves Iza, Jon Gangoiti, Gotzon de Camara, Estibaliz Saez eng Netherlands 2018/08/11 Sci Total Environ. 2019 Jan 10; 647:862-877. doi: 10.1016/j.scitotenv.2018.07.411. Epub 2018 Jul 31" |
