Water content of aged aerosol

by Ru-Jin Huang, Yanlin Zhang, Carlo Bozzetti, Kin-Fai Ho, Jun-Ji Cao, Yongming Han, Kaspar R. Daellenbach, Jay G. Slowik, Stephen M. Platt, Francesco Canonaco, Peter Zotter, Robert Wolf, Simone M. Pieber, Emily a. Bruns, Monica Crippa, Giancarlo Ciarelli, Andrea Piazzalunga, Margit Schwikowski, Gülcin Abbaszade, Jürgen Schnelle-Kreis, Ralf Zimmermann, Zhisheng An, Sönke Szidat, Urs Baltensperger, Imad El Haddad, André S. H. Prévôt, J. B. Singh, Pradeep Behari, R. B. Yadava, Charles O. Stanier, Andrey Y. Khlystov, Wanyu R. Chan, Mulia Mandiro, Spyros N. Pandis, G. J. Engelhart, L. Hildebrandt, E. Kostenidou, N. Mihalopoulos, N. M. Donahue, Spyros N. Pandis, Theodore W. Wilson, Luis a. Ladino, Peter a. Alpert, Mark N. Breckels, Ian M. Brooks, Jo Browse, Susannah M. Burrows, Kenneth S. Carslaw, J. Alex Huffman, Christopher Judd, Wendy P. Kilthau, Ryan H. Mason, Gordon McFiggans, Lisa a. Miller, Juan J. Nájera, Elena Polishchuk, Stuart Rae, Corinne L. Schiller, Meng Si, Jesús Vergara Temprado, Thomas F. Whale, Jenny P. S. Wong, Oliver Wurl, Jacqueline D. Yakobi-Hancock, Jonathan P. D. Abbatt, Josephine Y. Aller, Allan K. Bertram, Daniel a. Knopf, Benjamin J. Murray, Siyuan Wang, Dongwei Wu, Xin-Ming Wang, Jimmy Chi-Hung Fung, Jian Zhen Yu, Weigang Wang, Kun Li, Li Zhou, Maofa Ge, Siqi Hou, Tong Shengrui, Yujing Mu, Long Jia, L. Brégonzio-Rozier, F. Siekmann, C. Giorio, E. Pangui, S. B. Morales, B. Temime-Roussel, A. Gratien, V. Michoud, S. Ravier, M. Cazaunau, A. Tapparo, A. Monod, J.-F. Doussin, H. Saathoff, K.-H. Naumann, O. Möhler, Å. M. Jonsson, M. Hallquist, A. Kiendler-Scharr, Th. F. Mentel, R. Tillmann, U. Schurath, M. Shiraiwa, C. Pfrang, T. Koop, U. Pöschl, David Steitz, Nasa Headquarters, Chris Rink, John Bluck, Oral Presentations, Chemical Society, Isabel Rosario, Yamazaki Environment, Energy Building, Atmospheric Chemistry, Physics Discussions, M. Shiraiwa, C. Pfrang, T. Koop, Tao Wang, Aijun Ding, Jian Gao, Wai Shing Wu, Shenzhen Climate Bulletin, E J Dunlea, S C Herndon, D D Nelson, R M Volkamer, F San Martini show all authors
Atmospheric Chemistry and Physics ()


First- and higher order-generation products formed from the oxidation of isoprene and methacrolein with OH radicals in the presence of NOx have been studied in a simulation chamber. Significant oxidation rates have been maintained for up to 7 h, allowing the study of highly oxidized products. Gas-phase product distribution and yields were obtained, and show good agreement with previous studies. Secondary organic aerosol (SOA) formation has also been investigated. SOA mass yields from previous studies show large discrepancies. The mass yields obtained here were consistent with the lowest values found in the literature, and more specifically in agreement with studies carried out with natural light or artificial lamps with emission similar to the solar spectrum. Differences in light source are therefore proposed to explain partially the discrepancies observed between different studies in the literature for both isoprene- and methacrolein-SOA mass yields. There is a high degree of similarity between the SOA mass spectra from isoprene and methacrolein photooxidation, thus strengthening the importance of the role of methacrolein in SOA formation from isoprene photooxidation under our experimental conditions (i.e., presence of NOx and long term oxidation). According to our results, SOA mass yields from both isoprene and methacrolein in the atmosphere could be lower than suggested by most of the current chamber studies.

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