Environmental Engineering Reference
In-Depth Information
4. Questions and Answers
A. Kerschbaumer:
Did you take into account deposition processes in the model?
Answer:
Both gravitation settling and wet removal of sea-salt aerosols were included
in the model. Our analysis of sea-salt measurements in Finokalia, Crete, shows
that southerly winds, blowing across the island, do not contribute to sea-salt
measurements at the monitoring site due to sea-salt deposition (Kishcha et al.,
2009). In particular, we detected that the majority of sea-salt aerosols was not
transported over land more than 50-60 km under moderate surface wind speeds
~7 m/s. In accordance with model sea-salt simulations in Tel-Aviv, under
summer light breeze conditions with surface wind speeds less than 4 m/s, the
majority of SSA is transported up to 30 km inland. During the transit of cyclones
across the Mediterranean, when surface wind speeds exceed 10 m/s, sea-salt
aerosols could be transported over ~70 km.
J. Casares:
Was any work done on size distributions of sea-salt measurements?
Answer:
A detailed set of eight particle size classes with effective size between 1
and 8 μm (1, 2, 3, 4, 5, 6, 7, and 8 μm) was used in our model.
M. Astitha:
Sea-salt aerosol production depends on relative humidity, especially
with respect to the size distribution of generated aerosols. Was that taken into
account in your emission scheme?
Answer:
In the current study, we used a sea-salt model with no dependence of
sea-salt production on relative humidity. The purpose of our study was to demon-
strate that specific features of the chosen monitoring site located over the land
could contribute to some discrepancy between model data and measurements,
no matter how sophisticated the sea-salt source function is. In the future, our
sea-salt forecasts may be further improved on sea-salt hygroscopic properties.
