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@ARTICLE{Stadtler:838696,
author = {Stadtler, Scarlet and Kühn, Thomas and Schröder, Sabine
and Taraborrelli, Domenico and Schultz, Martin G. and
Kokkola, Harri},
title = {{I}soprene derived secondary organic aerosol in a global
aerosol chemistry climate model},
journal = {Geoscientific model development discussions},
volume = {244},
issn = {1991-962X},
address = {Katlenburg-Lindau},
publisher = {Copernicus},
reportid = {FZJ-2017-07257},
pages = {1 - 35},
year = {2017},
abstract = {Within the framework of the global chemistry climate model
ECHAM-HAMMOZ a novel explicit coupling between the sectional
aerosol model HAM-SALSA and the chemistry model MOZ was
established to form isoprene derived secondary organic
aerosol (iSOA). Isoprene oxidation in the chemistry model
MOZ is described by a semi-explicit scheme consisting of 147
reactions, embedded in a detailed atmospheric chemical
mechanism with a total of 779 reactions. Low volatile
compounds (LVOC) produced during isoprene photooxidation are
identified and explicitly partitioned by HAM-SALSA. A group
contribution method was used to estimate their evaporation
enthalpies and corresponding saturation vapor pressures,
which are used by HAM-SALSA to calculate the saturation
concentration of each LVOC. With this method, every single
precursor is tracked in terms of condensation and
evaporation in each aerosol size bin. This approach lead to
the identification of ISOP(OOH)2 as a main contributor to
iSOA formation. Further, reactive uptake of isoprene
epoxidiols (IEPOX) and isoprene derived glyoxal were
included as iSOA sources. The parameterization of IEPOX
reactive uptake includes a dependency on aerosol pH value.
This model framework connecting semi-explicit isoprene
oxidation with explicit treatment of aerosol tracers leads
to a global, annual isoprene SOA yield of $16 \%$ relative
to the primary oxidation of isoprene by OH, NO3, and ozone.
With 445 Tg (392 TgC) isoprene emitted, an iSOA source
of 148 Tg (61 TgC) is simulated. The major part of iSOA
in ECHAM-HAMMOZ is produced by IEPOX (24.4 TgC) and
ISOP(OOH)2 (28.3 TgC). The main sink process is particle
wet deposition which removes 143 Tg (59 TgC). The iSOA
burden reaches 1.6 Tg (0.7 TgC) in the year 2012.},
cin = {IEK-8 / JSC},
ddc = {910},
cid = {I:(DE-Juel1)IEK-8-20101013 / I:(DE-Juel1)JSC-20090406},
pnm = {243 - Tropospheric trace substances and their
transformation processes (POF3-243) / 512 - Data-Intensive
Science and Federated Computing (POF3-512) / HITEC -
Helmholtz Interdisciplinary Doctoral Training in Energy and
Climate Research (HITEC) (HITEC-20170406) / Earth System
Data Exploration (ESDE)},
pid = {G:(DE-HGF)POF3-243 / G:(DE-HGF)POF3-512 /
G:(DE-Juel1)HITEC-20170406 / G:(DE-Juel-1)ESDE},
typ = {PUB:(DE-HGF)16},
doi = {10.5194/gmd-2017-244},
url = {https://juser.fz-juelich.de/record/838696},
}