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Titel Observation and modelling of the OH, HO2 and RO2 radicals at a suburban site of Beijing (Huairou) in winter 2016
VerfasserIn Zhaofeng Tan, Keding Lu, Xuefei Ma, Bohn Birger, Sebastian Broch, Hendrik Fuchs, Andreas Hofzumahaus, Frank Holland, Xin Li, Yuhan Liu, Anna Novelli, Franz Rohrer, Min Shao, Haichao Wang, Yusheng Wu, Limin Zeng, Astrid Kiendler-Scharr, Andreas Wahner, Yuanhang Zhang
Konferenz EGU General Assembly 2017
Medientyp Artikel
Sprache en
Digitales Dokument PDF
Erschienen In: GRA - Volume 19 (2017)
Datensatznummer 250146953
Publikation (Nr.) Volltext-Dokument vorhandenEGU/EGU2017-11027.pdf
 
Zusammenfassung
A comprehensive field campaign was carried out in winter 2016 in Huairou, a small town located 60 km northeast of Beijing downtown. Concentrations of OH, HO2and RO2 radicals were measured by a laser induced fluorescence instrument. Radical concentrations were smaller than during summer because of reduced solar radiation. Maximum hourly averaged OH, HO2 and RO2 radical concentrations were (3±2)×106cm−3, (8±6)×107 cm−3 and (7±5)×107 cm−3, respectively. Chemical modulation measurements were applied on a few days showing no significant OH interference for different chemical conditions. HONO and HCHO photolysis were found to be the most important primary source of ROx radicals. OH reactivity, the inverse of the OH radical lifetime, was also measured by a laser-photolysis and laser induced fluorescence instrument. In general, CO and NOx were the dominated OH reactants which contributed more than half of the total OH reactivity. The relative high OH concentrations in polluted episode enabled a fast oxidation of fresh emitted pollutants and the formation of secondary products. The observed radical concentrations were compared with the results from a chemical box model. The model is capable of reproducing radical concentrations in the moderate NOx conditions but has difficulty in both the low and high NOx regimes. The underestimation of RO2 radical concentrations in the high NOx conditions indicate a missing RO2 source.