Small-scale near-surface HCHO variation in traffic influenced areas

H. Ling, K. Schäfer, Y.S. Wang, P. Suppan
Formaldehyde (HCHO) plays an important role in photochemical reactions, vegetation-atmosphere exchange processes and adverse health effects as a trace gas in ambient air. Road traffic is an important emission source of HCHO in urban areas. To study HCHO variations in areas with high traffic load , two campaigns were performed by KIT/IMK-IFU in cooperation with IAP-CAS in the cities of Beijing/China and Augsburg/Germany. B th i B iji (2009 2010) ons of Both in Beijing (2009 -2010 and in Augsburg
more » ... 010 and in Augsburg (2012) , near-surface HCHO concentrations were measured by a Differential Optical Absorption Spectroscopy (DOAS) system. Concentrations of NO, NO 2 and O 3 were monitored by both DOAS and in situ instruments. Meteorological parameters like wind direction, wind speed and mixing layer height were obtained from weather stations and ceilometers, which are used for analyzing the influence of local convection and atmospheric stability. Manual and automatic traffic counting data were analyzed in Augsburg for estimating the influence of on-road vehicle emissions. The diurnal variation of HCHO, NO, NO2 and O3 near-surface concentrations are coupled with meteorological parameters and traffic counting results. The influences of wind, atmospheric stability and local traffic are discussed. Finally, a long-term variation of Beijing near-surface HCHO based on ground-based measurement is discussed. OVOCs, SOA
doi:10.5445/ir/220095040 fatcat:szykcabhjvamnnxd2zyn62czrq