 |
| Titel |
Updated aerosol module and its application to simulate secondary organic aerosols during IMPACT campaign May 2008 |
| VerfasserIn |
Y. P. Li, H. Elbern, K. D. Lu, E. Friese, A. Kiendler-Scharr, Th. F. Mentel, X. S. Wang, A. Wahner, Y. H. Zhang |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 13 ; Nr. 13, no. 13 (2013-07-03), S.6289-6304 |
| Datensatznummer |
250018734
|
| Publikation (Nr.) |
 copernicus.org/acp-13-6289-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| The formation of Secondary organic aerosol (SOA) was simulated with the
Secondary ORGanic Aerosol Model (SORGAM) by a classical gas-particle
partitioning concept, using the two-product model approach, which is widely
used in chemical transport models. In this study, we extensively updated
SORGAM including three major modifications: firstly, we derived temperature
dependence functions of the SOA yields for aromatics and biogenic VOCs (volatile organic compounds),
based on recent chamber studies within a sophisticated mathematic
optimization framework; secondly, we implemented the SOA formation pathways
from photo oxidation (OH initiated) of isoprene; thirdly, we implemented the
SOA formation channel from NO3-initiated oxidation of reactive biogenic
hydrocarbons (isoprene and monoterpenes). The temperature dependence
functions of the SOA yields were validated against available chamber
experiments, and the updated SORGAM with temperature dependence functions
was evaluated with the chamber data. Good performance was found with the
normalized mean error of less than 30%. Moreover, the whole updated
SORGAM module was validated against ambient SOA observations represented by
the summed oxygenated organic aerosol (OOA) concentrations abstracted from
aerosol mass spectrometer (AMS) measurements at a rural site near Rotterdam,
the Netherlands, performed during the IMPACT campaign in May 2008. In this
case, we embedded both the original and the updated SORGAM module into the
EURopean Air pollution and Dispersion-Inverse Model (EURAD-IM), which showed
general good agreements with the observed meteorological parameters and
several secondary products such as O3, sulfate and nitrate. With the
updated SORGAM module, the EURAD-IM model also captured the observed SOA
concentrations reasonably well especially those during nighttime. In
contrast, the EURAD-IM model before update underestimated the observations
by a factor of up to 5. The large improvements of the modeled SOA
concentrations by updated SORGAM were attributed to the mentioned three
modifications. Embedding the temperature dependence functions of the SOA
yields, including the new pathways from isoprene photo oxidations, and
switching on the SOA formation from NO3 initiated biogenic VOC
oxidations, contributed to this enhancement by 10, 22 and 47%,
respectively. However, the EURAD-IM model with updated SORGAM still clearly
underestimated the afternoon SOA observations up to a factor of two. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|