wAbstract
@Measurements of number size distributions of submicron aerosols
have been performed at the Eastern part of Mediterranean as part
of an extensive measurement campaign to study photo-oxidants and
aerosols (SUB-AERO Project). The measurements were made at the
Finokalia station on the island of Crete (Greece) and onboard
the research vessel gAegaeonh. Two campaigns were performed during
July 2000 and January 2001 using two scanning mobility particle
sizers. The particle distributions measured in the range between
7.8dP327 nm during the summer measurements
and between 7.5dP316 nm during the winter
measurements, where dP is the mobility particle
diameter. The concentration of ultrafine particles (7.5dP30 nm) was higher during the winter period and
varied mainly between 5~101 and 2~103 cm-3
with concentration peak values for this mode exceeding 1~104
cm-3. During the summer campaign, an average number
concentration of 1~102 cm-3 at Finokalia
and about 5~101 cm-3 aboard the gAegaeonh
vessel was measured. An average concentration of 1~103
cm-3 was measured for the particles in the size range
between 30 and 100 nm, whereas in the size range 100-300 nm, the
measured concentration ranged between 1~102 and 5~103
cm-3. Diurnal patterns in number concentrations were
observed in connection with the transport of air masses and local
sources. During the winter period, three nucleation events were
observed in connection with the appearance of a particle mode
at 20 nm.
Keywords: Nucleation events; Aerosols; Particulate matter; Mediterranean
areax
1. Introduction
2. Description of the field campaigns
@2.1. Instrumentation
@2.2. SMPS data processing
3. Results and discussion
@3.1. Integral particle number concentrations
@3.2. Grand average number size distributions
@3.3. Diurnal patterns of the particle number size distributions
@3.4. Dynamics of particle size distribution
@3.5. New particle formation events
4. Conclusions
Acknowledgements
References