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| Titel |
Isoprene derived secondary organic aerosol in a global aerosol chemistry climate model |
| VerfasserIn |
Scarlet Stadtler, Thomas Kühn, Domenico Taraborrelli, Harri Kokkola, Martin Schultz |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250147767
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| Publikation (Nr.) |
 EGU/EGU2017-11973.pdf |
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| Zusammenfassung |
| Secondary organic aerosol (SOA) impacts earth’s climate and human health. Since its
precursor chemistry and its formation are not fully understood, climate models
cannot catch its direct and indirect effects. Global isoprene emissions are higher than
any other non-methane hydrocarbons. Therefore, SOA from isoprene-derived, low
volatile species (iSOA) is simulated using a global aerosol chemistry climate model
ECHAM6-HAM-SALSA-MOZ. Isoprene oxidation in the chemistry model MOZ is
following a novel semi-explicit scheme, embedded in a detailed atmospheric chemical
mechanism. For iSOA formation four low volatile isoprene oxidation products were
identified. The group method by Nanoonlal et al. 2008 was used to estimate their evaporation
enthalpies ΔHvap. To calculate the saturation concentration C∗(T) the sectional
aerosol model SALSA uses the gas phase concentrations simulated by MOZ and their
corresponding ΔHvap to obtain the saturation vapor pressure p∗(T) from the Clausius
Clapeyron equation. Subsequently, the saturation concentration is used to calculate the
explicit kinetic partitioning of these compounds forming iSOA. Furthermore, the
irreversible heterogeneous reactions of IEPOX and glyoxal from isoprene were
included. The possibility of reversible heterogeneous uptake was ignored at this
stage, leading to an upper estimate of the contribution of glyoxal to iSOA mass. |
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