Delft, a great fondness for me
In the end of January to the beginning of February, I spent two weeks on my ITaRS secondment in TU Delft Climate Institute, Delft University of Technology in The Netherlands. During the two weeks, I joined ACTRIS 4th WP22 Progress Workshop, and have learned ground based cloud radar and ceilometer data process for the aerosol cloud interaction (ACI) study. Pleasant discussions on aerosol and cloud research often occurred during the talks with K. Sarna, Prof. H.W.J. Russchenberg, and Dr. G. Biskos.
Secondment of ER5 at TROPOS
In December 2014, I visited Leipzig, Germany, for a two-week secondment at the TROPOS institute. The purpose of my visit was a training on aerosol classification procedures and further insight into multiple aspects of operational lidar data processing.
When does a cloud start to rain?
by Maria Barrera Verdejo, Moritz Haarig, William Greg Blumberg, Dimitra Mamali, and Linda Forster
The conversion of cloud droplets (approx. 10 µm) to drizzle (approx. 50 µm) is associated with the starting point of precipitation. In a non-precipitating cloud the largest cloud droplets are close to the cloud top, due to the droplet growth by condensation. Further growing of the droplets by the process of collision-coalescence results in a downward movement of these droplets, which enhances even further the growth by colliding with other droplets. Drizzle is formed and the cloud will start precipitating.
How much precipitation do we have?
by Claudia Acquistapace, Robert Banks, Gordon Diefenthal, Marvin Forde, and Francesco De Angelis
The aim of the group project was to evaluate the accuracy of precipitation estimation at the ground during a severe storm event, which happened on 09.06.2014 (Pentecost storm). A local relation between reflectivity (Z) and rain rate (R) was derived for the JOYCE site using independent observations of rain rates and Z values from a Parsivel disdrometer located at the site. It is the aim of this derivation to provide independent observations of rain rates from the reflectivities of a 3D radar composite by the University of Bonn. Various Z-R relations were developed: Marshall-Palmer, local, convective, and two relations using the polarimetric moments, Z_DR and K_DP.
