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Chemical composition of nanoparticles from α-pinene nucleation and the influence of isoprene and relative humidity at low temperature

Caudillo, Lucía; Rörup, Birte; Heinritzi, Martin; Marie, Guillaume; Simon, Mario; Wagner, Andrea C.; Müller, Tatjana; Granzin, Manuel; Amorim, Antonio; Ataei, Farnoush; Baalbaki, Rima; Bertozzi, Barbara; Brasseur, Zoé; Chiu, Randall; Chu, Biwu; Dada, Lubna; Duplissy, Jonathan; Finkenzeller, Henning; Gonzalez Carracedo, Loïc; He, Xu-Cheng; ... mehr

Abstract (englisch):
Biogenic organic precursors play an important role in atmospheric new particle formation (NPF). One of the major precursor species is α-pinene, which upon oxidation can form a suite of products covering a wide range of volatilities. Highly oxygenated organic molecules (HOMs) comprise a fraction of the oxidation products formed. While it is known that HOMs contribute to secondary organic aerosol (SOA) formation, including NPF, they have not been well studied in newly formed particles due to their very low mass concentrations. Here we present gas- and particle-phase chemical composition data from experimental studies of α-pinene oxidation, including in the presence of isoprene, at temperatures (−50 and −30 ◦C) and relative humidities (20 % and 60 %)relevant in the upper free troposphere. The measurements took place at the CERN Cosmics Leaving Outdoor Droplets (CLOUD) chamber. The particle chemical composition was analyzed by a thermal desorption differential mobility analyzer (TD-DMA) coupled to a nitrate chemical ionization–atmospheric pressure interface–time-of-flight (CI-APi-TOF) mass spectrometer. CI-APi-TOF was used for particle- and gas-phase measurements, applying the same ionization and detection scheme. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000140321
Veröffentlicht am 25.11.2021
DOI: 10.5194/acp-21-17099-2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Aerosolforschung (IMK-AAF)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 25.11.2021
Sprache Englisch
Identifikator ISSN: 1680-7324
KITopen-ID: 1000140321
HGF-Programm 12.11.26 (POF IV, LK 01) Aerosol-Cloud-Climate-Interaction
Erschienen in Atmospheric chemistry and physics
Verlag European Geosciences Union (EGU)
Band 21
Heft 22
Seiten 17099–17114
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