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Journal article

Artificial primary marine aerosol production: A laboratory study with varying water temperature, salinity, and succinic acid concentration

Zábori J, Matisans M, Krejci R, Nilsson E, Ström J...(+5 more)

Atmospheric Chemistry and Physics, vol. 12, issue 22 (2012) pp. 10709-10724

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Abstract

Primary marine aerosols are an important component of the climate
system, especially in the remote marine environment. With diminishing
sea-ice cover, better understanding of the role of sea spray aerosol on
climate in the polar regions is required. As for Arctic Ocean water,
laboratory experiments with NaCl water confirm that a few degrees change
in the water temperature (T-w) gives a large change in the number of
primary particles. Small particles with a dry diameter between 0.01 mu m
and 0.25 mu m dominate the aerosol number density, but their relative
dominance decreases with increasing water temperature from 0 degrees C
where they represent 85-90% of the total aerosol number to 10 degrees
C, where they represent 60-70% of the total aerosol number. This effect
is most likely related to a change in physical properties and not to
modification of sea water chemistry. A change of salinity between 15 g
kg(-1) and 35 g kg(-1) did not influence the shape of a particle number
size distribution. Although the magnitude of the size distribution for a
water temperature change between 0 degrees C and 16 degrees C changed,
the shape did not. An experiment where succinic acid was added to a NaCl
water solution showed, that the number concentration of particles with
0.010 mu m< D-p< 4.5 mu m decreased on average by 10% when the succinic
acid concentration in NaCl water at a water temperature of 0 degrees C
was increased from 0 mu mol L-1 to 94 mu mol L-1. A shift to larger
sizes in the particle number size distribution is observed from pure
NaCl water to Arctic Ocean water. This is likely a consequence of
organics and different inorganic salts present in Arctic Ocean water in
addition to the NaCl.

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