TY  - JOUR
A1  - Caudillo-Plath, Lucı́a
A1  - Rörup, Birte
A1  - Heinritzi, Martin
A1  - Marie, Guillaume
A1  - Simon, Mario
A1  - Wagner, Andrea C.
A1  - Müller, Tatjana
A1  - Granzin, Manuel
A1  - Amorim, Antonio
A1  - Ataei, Farnoush
A1  - Baalbaki, Rima
A1  - Bertozzi, Barbara
A1  - Brasseur, Zoé
A1  - Chiu, Randall
A1  - Chu, Biwu
A1  - Dada, Lubna
A1  - Duplissy, Jonathan
A1  - Finkenzeller, Henning
A1  - Gonzalez Carracedo, Loïc
A1  - He, Xu-Cheng
A1  - Hofbauer, Victoria
A1  - Kong, Weimeng
A1  - Lamkaddam, Houssni
A1  - Lee, Chuan P
A1  - Lopez, Brandon
A1  - Mahfouz, Naser G. A.
A1  - Makhmutov, Vladimir
A1  - Manninen, Hanna E.
A1  - Marten, Ruby
A1  - Massabò, Dario
A1  - Mauldin, Roy L.
A1  - Mentler, Bernhard
A1  - Molteni, Ugo
A1  - Onnela, Antti
A1  - Pfeifer, Joschka
A1  - Philippov, Maxim
A1  - Piedehierro, Ana A.
A1  - Schervish, Meredith
A1  - Scholz, Wiebke
A1  - Schulze, Benjamin
A1  - Shen, Jiali
A1  - Stolzenburg, Dominik
A1  - Stožkov, Ju. I.
A1  - Surdu, Mihnea
A1  - Tauber, Christian
A1  - Tham, Yee Jun
A1  - Tian, Ping
A1  - Tomé, António
A1  - Vogt, Steffen
A1  - Wang, Mingyi
A1  - Wang, Dongyu S.
A1  - Weber, Stefan K.
A1  - Welti, André
A1  - Yonghong, Wang
A1  - Yusheng, Wu
A1  - Zauner-Wieczorek, Marcel
A1  - Baltensperger, Urs
A1  - El Haddad, Imad
A1  - Flagan, Richard C.
A1  - Hansel, Armin
A1  - Höhler, Kristina
A1  - Kirkby, Jasper
A1  - Kulmala, Markku
A1  - Lehtipalo, Katrianne
A1  - Möhler, Ottmar
A1  - Saathoff, Harald
A1  - Volkamer, Rainer
A1  - Winkler, Paul M.
A1  - Donahue, Neil M.
A1  - Kürten, Christoph Andreas
A1  - Curtius, Joachim
T1  - Chemical composition of nanoparticles from α-pinene nucleation and the influence of isoprene and relative humidity at low temperature
T2  - Atmospheric Chemistry and Physics. Discussions
N2  - 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. Our measurements revealed the presence of C8−10 monomers and C18−20 dimers as the major compounds in the particles (diameter up to ∼ 100 nm). Particularly, for the system with isoprene added, C5 (C5H10O5−7) and C15 compounds (C15H24O5−10) were detected. This observation is consistent with the previously observed formation of such compounds in the gas phase. However, although the C5 and C15 compounds do not easily nucleate, our measurements indicate that they can still contribute to the particle growth at free tropospheric conditions. For the experiments reported here, most likely isoprene oxidation products enhance the growth of particles larger than 15 nm. Additionally, we report on the nucleation rates measured at 1.7 nm (J1.7 nm) and compared with previous studies, we found lower J1.7 nm values, very likely due to the higher α-pinene and ozone mixing ratios used in the present study.
Y1  - 2021
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/82265
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-822659
SN  - 1680-7375
N1  - Financial support. This work was supported by Innovative Training Networks – ITN 400 (CLOUD-Motion H2020-MSCA-ITN- 2017 no. 764991) and by the German Ministry of Science and Education (CLOUD-16, 01LK1601A). US National Science Foundation Award (AGS-1801280, AGS-1801574, AGS 1801897). Swiss National Science Foundation (20020_172602,
BSSGI0_155846).
N1  - Begutachteter Artikel erschienen in: Atmospheric chemistry and physics, 21.2021, Nr. 22, S. 17099-17114, doi: 10.5194/acp-21-17099-2021
VL  - 21
SP  - 1
EP  - 26
PB  - Katlenburg-Lindau
CY  - EGU
ER  -