UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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Conference: Bucharest University Faculty of Physics 2018 Meeting


Section: Atmosphere and Earth Science; Environment Protection


Title:
Algorithms for processing the radial Doppler velocities from Bucharest C-band meteorological radar in severe weather conditions


Authors:
Tiberiu HRISCAN(1,2), Daniel CARBUNARU(2), Sabina STEFAN(1), Gabriela IORGA(3)


Affiliation:
1) University of Bucharest, Faculty of Physics, P.O.Box MG-11, Magurele, 077125 Bucharest, Romania

2) Administratia Nationala de Meteorologie, Sos. Bucuresti-Ploiesti nr. 97, sector 1, 013686, Bucharest, Romania

3) University of Bucharest, Department of Physical Chemistry (Physics Group), Bd. Regina Elisabeta 4-12, 030018, Bucharest, Romania



E-mail
tiberiu.hriscan@gmail.com


Keywords:
radar, wind, Doppler, velocity


Abstract:
The aim of the present study is to analyze the wind in two different cases of severe weather above Bucharest and its surroundings with the help of the EDGE (Enterprise Doppler Graphics Environment) software, from EEC, using the C band meteorological radar from National Meteorological Administration in Bucharest. We present and discuss the Doppler radial velocity and the wind applications the software provides us: Volume Velocity Processing (VVP/ VVP2) and Velocity Azimuth Display (VAD). We also look at the algorithms, which stand at the base of this application. The basic products (reflectivity radar, basic Doppler) and some derived products (accumulation precipitations, severity algorithms) used by the nowcasting meteorologist are very useful, in a first approximation, in issuing warnings over a short period of time. We show a major improvement can be brought if other derivative products such as VVP (VVP2) and VAD are considered. If the input data (Doppler radial velocities) initially presents systematic errors (reversal of values), changing the Doppler speed processing algorithm (implemented in EDGE) and activating the function that brings the values to the real ones can considerably improve the two algorithms. VVPs can be also used at least in two situations, namely, to track boundary layer behavior before convection (vertical convergence and vertical velocity) and in continuous rainfall situations (stratiforms - the presence of a cyclonic system in the radar field). On the other hand, following the dimensional structures highlighted by the two algorithms, the meteorologist accumulates supplementary information about the mesoscale dynamic behavior in the boundary layer.


Acknowledgement:
The authors thank to National Meteorological Administration for providing the data, R. Chiritescu and A. Simion for their feedback on the study results.