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@ARTICLE{Khosrawi:28900,
author = {Khosrawi, F. and Konopka, Paul},
title = {{E}nhanced particle formation and growth due to mixing
processes in the tropopause region},
journal = {Atmospheric environment},
volume = {37},
issn = {1352-2310},
address = {Amsterdam [u.a.]},
publisher = {Elsevier Science},
reportid = {PreJuSER-28900},
pages = {903 - 910},
year = {2003},
note = {Record converted from VDB: 12.11.2012},
abstract = {Enhancement of the binary homogeneous nucleation rate of
H2SO4 and H2O and condensation of H2O and HNO3 on liquid
sulphate aerosol particles due to mixing processes in the
tropopause region were investigated by conducting
theoretical studies and by using a section aerosol box
model. If two air parcels with a large initial temperature
and humidity difference are mixed with each other the
nucleation rate within the resulting air parcel will be
enhanced. This is due to the curvature of the saturation
vapour pressure curve. The theoretical studies show that in
the tropopause region enhancements of the nucleation rate of
up to five orders of magnitude can occur. Since the mixing
causes strong supersaturations also the condensation rate
will be enhanced, especially for HNO3. The simulation with
the sectional aerosol box model shows that after the mixing
of two air parcels up to 40 $wt\%$ of HNO3 is taken up by
the smallest aerosol particles. Since the initial air
parcels are initialized with 0 $wt\%$ HNO3 this corresponds
to a very strong enhancement. Measurements during the STREAM
1998 campaign show,, an entrainment of stratospheric air
into the troposphere during the flight on 15 July leading to
a production of new particles. Box model studies reproduce
fairly well the measured number of newly formed particles.
(C) 2003 Elsevier Science Ltd. All rights reserved.},
keywords = {J (WoSType)},
cin = {ICG-I},
ddc = {550},
cid = {I:(DE-Juel1)VDB47},
pnm = {Chemie und Dynamik der Geo-Biosphäre},
pid = {G:(DE-Juel1)FUEK257},
shelfmark = {Environmental Sciences / Meteorology $\&$ Atmospheric
Sciences},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000181260700004},
doi = {10.1016/S1352-2310(02)00976-7},
url = {https://juser.fz-juelich.de/record/28900},
}