TY  - JOUR
A1  - Duplissy, Jonathan
A1  - DeCarlo, Peter F.
A1  - Dommen, Josef
A1  - Alfarra, M. Rami
A1  - Metzger, Axel
A1  - Barmpadimos, Iakovos
A1  - Prevot, André Stephan Henry
A1  - Weingartner, Ernest
A1  - Tritscher, Torsten
A1  - Gysel, Martin
A1  - Aiken, Allison C.
A1  - Jimenez, Jose Luis
A1  - Canagaratna, Manjula R.
A1  - Worsnop, Douglas R.
A1  - Collins, Donald R.
A1  - Tomlinson, Jason M.
A1  - Baltensperger, Urs
T1  - Relating hygroscopicity and composition of organic aerosol particulate matter
T2  - Atmospheric chemistry and physics
N2  - A hygroscopicity tandem differential mobility analyzer (HTDMA) was used to measure the water uptake (hygroscopicity) of secondary organic aerosol (SOA) formed during the chemical and photochemical oxidation of several organic precursors in a smog chamber. Electron ionization mass spectra of the non-refractory submicron aerosol were simultaneously determined with an aerosol mass spectrometer (AMS), and correlations between the two different signals were investigated. SOA hygroscopicity was found to strongly correlate with the relative abundance of the ion signal m/z 44 expressed as a fraction of total organic signal (f44). m/z 44 is due mostly to the ion fragment CO2+ for all types of SOA systems studied, and has been previously shown to strongly correlate with organic O/C for ambient and chamber OA. The analysis was also performed on ambient OA from two field experiments at the remote site Jungfraujoch, and the megacity Mexico City, where similar results were found. A simple empirical linear relation between the hygroscopicity of OA at subsaturated RH, as given by the hygroscopic growth factor (GF) or "ϰorg" parameter, and f44 was determined and is given by ϰorg = 2.2 × f44 − 0.13. This approximation can be further verified and refined as the database for AMS and HTDMA measurements is constantly being expanded around the world. The use of this approximation could introduce an important simplification in the parameterization of hygroscopicity of OA in atmospheric models, since f44 is correlated with the photochemical age of an air mass.
Y1  - 2011
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/26785
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-267858
SN  - 1680-7324
N1  - © Author(s) 2011. This work is distributed under the Creative Commons Attribution 3.0 License.
VL  - 11
SP  - 1155
EP  - 1165
PB  - European Geosciences Union
CY  - Katlenburg-Lindau
ER  -