International Workshop
on Comparing Ice Nucleation Measuring Systems (ICIS 2007)
September 10 to 28,
2007
Institute for
Meteorology and Climate Research (IMK-AAF)
Suggested list of
experiments
We have 10
days of experiments with one type of aerosol every day and one initial
temperature for three subsequent AIDA expansion experiments during the day. A
typical daily programme is included below.
First, the
aerosol will be added to the NAUA chamber at concentrations between about 50000
and 100000 cm-3. After aerosol characterisation (number, size distribution,
composition, etc) a minor part of the aerosol will be transferred to the larger
AIDA chamber for IN activation in expansion experiments. Number concentrations
in AIDA will range from 100 to 500 cm-3. All IN counters and filter
devices can sample any time during the day from the NAUA vessel,
or for about 1 hour from the AIDA chamber before any of three expansion runs.
During this time the AIDA aerosol will be at atmospheric pressure.
The aerosol
mass spectrometers can also sample from both chambers and, in addition to that,
from the PCVI for analysis of ice residual particles.
Further
instruments will sample through vertical tubes below the AIDA chamber to
characterize mixed-phase and ice clouds during the AIDA expansion experiments.
The following
list of experiments is subject for further discussion among the ICIS
participants:
|
No. |
Aerosol |
T_AIDA (°C) |
Comments |
|
1 |
Snomax |
-8 |
As
reference to IN active bacteria |
|
2 |
Bacteria susp. |
-8 |
Strain of
bacteria used for Snomax production |
|
3 |
ATD |
-18 |
As a
reference for IN activity of mineral dust. |
|
4 |
ATD |
-28 |
|
|
5 |
Desert
dust 1 |
-18 |
If
possible dust storm sample from |
|
6 |
Desert
dust 1 |
-28 |
|
|
7 |
Desert
dust 2 |
-18 |
If
possible sample from the Bodele area. |
|
8 |
Desert
dust 2 |
-28 |
|
|
9 |
GfG
Soot |
-45 |
As a
reference for IN activity of soot aerosol |
|
10 |
CAST Soot |
-45 |
To
investigate the effect of organics on IN |
|
|
|
|
|
|
|
|
|
|
ATD =
GfG = graphite spark generator
CAST = Combustion aerosol standard burner
We ask all
participants for comments and suggestions!
Typical
daily schedule during the ICIS workshop:
