TY  - JOUR
A1  - Ehrhart, Sebastian
A1  - Ickes, Luisa
A1  - Almeida, Joao
A1  - Amorim, Antonio
A1  - Barmet, Peter
A1  - Bianchi, Federico
A1  - Dommen, Josef
A1  - Dunne, Eimear M.
A1  - Duplissy, Jonathan
A1  - Franchin, Alessandro
A1  - Kangasluoma, Juha
A1  - Kirkby, Jasper
A1  - Kürten, Christoph Andreas
A1  - Kupc, Agnieszka
A1  - Lehtipalo, Katrianne
A1  - Nieminen, Tuomo
A1  - Riccobono, Francesco
A1  - Rondo, Linda
A1  - Schobesberger, Siegfried
A1  - Steiner, Gerhard
A1  - Tomé, Antonio
A1  - Wimmer, Daniela
A1  - Baltensperger, Urs
A1  - Wagner, Paul E.
A1  - Curtius, Joachim
T1  - Comparison of the SAWNUC model with CLOUD measurements of sulphuric acid-water nucleation
T2  - Journal of geophysical research. D, Atmospheres
N2  - Binary nucleation of sulphuric acid-water particles is expected to be an important process in the free troposphere at low temperatures. SAWNUC (Sulphuric Acid Water Nucleation) is a model of binary nucleation that is based on laboratory measurements of the binding energies of sulphuric acid and water in charged and neutral clusters. Predictions of SAWNUC are compared for the first time comprehensively with experimental binary nucleation data from the CLOUD chamber at European Organization for Nuclear Research. The experimental measurements span a temperature range of 208–292 K, sulphuric acid concentrations from 1·106 to 1·109 cm−3, and distinguish between ion-induced and neutral nucleation. Good agreement, within a factor of 5, is found between the experimental and modeled formation rates for ion-induced nucleation at 278 K and below and for neutral nucleation at 208 and 223 K. Differences at warm temperatures are attributed to ammonia contamination which was indicated by the presence of ammonia-sulphuric acid clusters, detected by an Atmospheric Pressure Interface Time of Flight (APi-TOF) mass spectrometer. APi-TOF measurements of the sulphuric acid ion cluster distributions (math formula with i = 0, 1, ..., 10) show qualitative agreement with the SAWNUC ion cluster distributions. Remaining differences between the measured and modeled distributions are most likely due to fragmentation in the APi-TOF. The CLOUD results are in good agreement with previously measured cluster binding energies and show the SAWNUC model to be a good representation of ion-induced and neutral binary nucleation of sulphuric acid-water clusters in the middle and upper troposphere.
KW  - binary nucleation
KW  - ion‐induced nucleation
Y1  - 2017
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/45044
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-450447
SN  - 2169-8996
SN  - 2169-897X
N1  - ©2016. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
VL  - 121
IS  - 20
SP  - 12,401
EP  - 12,414
PB  - Wiley
CY  - Hoboken, NJ
ER  -