In:
Atmospheric Chemistry and Physics, Copernicus GmbH, Vol. 22, No. 15 ( 2022-08-04), p. 10023-10043
Kurzfassung:
Abstract. In this study, we modeled the aerosol particle formation along air mass
trajectories arriving at the remote Arctic research stations Gruvebadet (67 m a.s.l.) and Zeppelin (474 m a.s.l.), Ny-Ålesund, during May 2018. The aim
of this study was to improve our understanding of processes governing
secondary aerosol formation in remote Arctic marine environments. We run the
Lagrangian chemistry transport model ADCHEM, along air mass trajectories
generated with FLEXPART v10.4. The air masses arriving at Ny-Ålesund
spent most of their time over the open ice-free ocean. In order to capture
the secondary aerosol formation from the DMS emitted by phytoplankton from
the ocean surface, we implemented a recently developed comprehensive DMS and
halogen multi-phase oxidation chemistry scheme, coupled with the widely used
Master Chemical Mechanism (MCM). The modeled median particle number size distributions are in close agreement
with the observations in the marine-influenced boundary layer near-sea-surface Gruvebadet site. However, while the model reproduces the
accumulation mode particle number concentrations at Zeppelin, it
overestimates the Aitken mode particle number concentrations by a factor of
∼5.5. We attribute this to the deficiency of the model to
capture the complex orographic effects on the boundary layer dynamics at
Ny-Ålesund. However, the model reproduces the average vertical particle
number concentration profiles within the boundary layer (0–600 m a.s.l.)
above Gruvebadet, as measured with condensation particle counters (CPCs) on
board an unmanned aircraft system (UAS). The model successfully reproduces the observed Hoppel minima, often seen in
particle number size distributions at Ny-Ålesund. The model also
supports the previous experimental findings that ion-mediated
H2SO4–NH3 nucleation can explain the observed new particle
formation in the marine Arctic boundary layer in the vicinity of
Ny-Ålesund. Precursors resulting from gas- and aqueous-phase DMS
chemistry contribute to the subsequent growth of the secondary aerosols. The
growth of particles is primarily driven via H2SO4 condensation and
formation of methane sulfonic acid (MSA) through the aqueous-phase
ozonolysis of methane sulfinic acid (MSIA) in cloud and deliquescent
droplets.
Materialart:
Online-Ressource
ISSN:
1680-7324
DOI:
10.5194/acp-22-10023-2022
DOI:
10.5194/acp-22-10023-2022-supplement
Sprache:
Englisch
Verlag:
Copernicus GmbH
Publikationsdatum:
2022
ZDB Id:
2092549-9
ZDB Id:
2069847-1
