Alessandro Zardini
Postdoc at CCARCopenhagen Center for Atmospheric Research
University of Copenhagen, Denmark
Biogenic Secondary Organic Aerosols: Observations to Global Modeling July 1- 4, 2007, Hyytiälä Forestry Field Station, Finland
Who am I ?
My town: Verona, Italy
My education
Degree in Physics with the AOD group (Atmosphere and Ocean Dynamics)
“Galileo Galilei” Physics Dept., University of Padova, Italy.
Dealing withMeteorological Dynamics and Climatology
Arena Romeo and Juliet Balcony
Biogenic Secondary Organic Aerosols: Observations to Global Modeling July 1- 4, 2007, Hyytiälä Forestry Field Station, Finland
PhD at the Institute for Atmospheric and Climate Science, at the Swiss Federal Institute of Technology ETH, Zurich, Switzerland.
My education
Thesis:“The effects of organic compounds on the hygroscopic properties of inorganic aerosols”
(water uptake, phase changes, predictibility)
The setup: electrodynamic balance
Biogenic Secondary Organic Aerosols: Observations to Global Modeling July 1- 4, 2007, Hyytiälä Forestry Field Station, Finland
AS>AA: no particular effects(AS takes up water, AA does not)
• pre-deliquescence water uptake: 5-15%• complex dehydration branch • incomplete Efflorescence
AS<AA: cycles are completly altered
...some examples...
Ammonium Sulfate+Adipic Acid
warning: there is water also when it shouldn’t be there
...some examples...
Glutaric Acid
0 10000 20000 30000 40000 50000 60000 7000020
40
60
80
100
20
40
60
80
285
290
VD
C
time (s)
0.1
1
GA
RH
%
RM
SD
2
4
6
8
10
12
rad
ius
(µm
)
file: 130205particle: ulema
T (
K)
clear efflorescence
no sharp efflorescence
warning: one single technique is not enough to fully characterize the organics
Biogenic Secondary Organic Aerosols: Observations to Global Modeling July 1- 4, 2007, Hyytiälä Forestry Field Station, Finland
Thermodynamic Properties of Organic Aerosols
Part of EUCAARIan European Integrated project on Aerosol Cloud Climate Interactions
Main focus: laboratory measurements of evaporation rates of aerosol particles vapor pressure
...and CCN activity...
...and complementary smog chamber measurements
Special attention to Keto-Acidsand to mixed inorganic/organic particles
...and now...
…by using a modified H-TDMA
Scientific interests and outlooks
thermodynamic properties of aerosol particles:water uptake, phase changes, predictability with simple approaches (ZSR)
in particular now: vapor pressure of aerosol components and effects of the inorganic component on the volatility of the organics(crucial for the gas/particle partitioning)
...implement this investigation in models
...and from this workshop it would be helpful to have a feedback on the actual needs concerning thermodynamic properties,and to know better how modelers implement the organic/inorganic interactions in global models...
