Open AccessAerosol production and growth in the upper free troposphere
Author(s) -
Reus M.,
Ström J.,
Curtius J.,
Pirjola L.,
Vignati E.,
Arnold F.,
Hansson H. C.,
Kulmala M.,
Lelieveld J.,
Raes F.
Publication year - 2000
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2000jd900382
Subject(s) - aerosol , troposphere , nucleation , atmospheric sciences , condensation , particle (ecology) , cloud condensation nuclei , water vapor , particle number , environmental science , sulfuric acid , particle size distribution , chemical physics , meteorology , particle size , chemistry , physics , thermodynamics , geology , inorganic chemistry , oceanography , volume (thermodynamics)
During the Second Aerosol Characterization Experiment (ACE 2), aircraft measurements of aerosol number concentration and size distribution were performed in the upper free troposphere. Temporal changes in aerosol number concentration and size distribution were studied by repeatedly probing three different altitude levels during one single flight. The observations provide indirect evidence for particle formation and growth. Simulations with a coupled gas‐phase chemistry and aerosol dynamical model, including binary homogeneous nucleation of sulfuric acid and water vapor, suggest that the ultrafine particles observed in the early morning were most likely formed when the air mass was lifted over a cold front, one day prior to the measurements. Particle growth was studied using two different aerosol dynamical models assuming particle growth by condensation of sulfuric acid and water vapor. The models were unable to simulate the observed particle growth, which suggests that another process might be important for aerosol growth, or multicomponent condensation involving species not observed and modeled play a key role in the evolution of the aerosol size distribution.