Variables & Measurement Techniques
The key-mission of CIS is to offer operational support to ACTRIS National Facilities (NFs) operating instrumentation for continuous long-term measurements of cloud occurrence, cloud water content, and cloud droplet effective diameter at observational platforms, or for episodic measurements of cloud particle size distributions, chemical cloud water composition, and ice nucleating particles during dedicated laboratory and field campaigns.
Observational platforms have to provide the two mandatory variables
- liquid water content
- droplet effective diameter
and must provide at least two of the specializing variables
- droplet number concentration
- droplet size distribution
- ice particle number concentration
- ice particle size distribution
- INP number concentration
- INP temperature spectrum
- bulk cloud water chemical composition
© Ludwig Rasser
- mandatory variables
© ZAMG/Elke Ludewig
Particulate Volume Monitor PVM-100 from Gerber Scientic Inc.
© ZAMG/Elke Ludewig
Fog Monitor GFAS-DPOL from DMT
- INP measurements
HINC-Auto PINE INSEKT
Freezing Assay INSEKT (Ice Nucleation Spectrometer of the Karlsruhe Insitute of Technology)
See also technical paper
- cloud water chemistry
The cloud water chemistry analysis contains both the cloud water sampling with specialized collectors and the subsequent offline chemical analysis by i.e. ion chromatography systems.
- cloud particle measurements
Supported instruments for cloud particle measurements are based on Mie-Scattering Probes as CDP and Imaging Probes as CPI.
© KIT/Pia Bogert
09 November 2021, by CCIce
start of first long-term test campaigns with the mobile cloud chamber PINE at the Sonnblick Observatory, Austria and Mt. Helmos Observatory, Greece
Since summer 2021, two PINE instruments from KIT are installed at the potential ACTRIS CIS sites Sonnblick Observatory, Austria and Mt. Helmos Observatory, Greece to perform longterm INP measurements in boundary and free-troposphere conditions. These test campaigns will also show the scientific potential to measure INPs at different location at the same time.