Open AccessMESOCYCLONE OBSERVATION BY MULTI-PARAMETER METEOROLOGICAL RADAR
Author(s) -
D. A. Denisenkov,
V. Yu. Zhukov,
G. G. Shchukin
Publication year - 2020
Language(s) - English
DOI - 10.33933/2074-2762-2020-58-9-19
Subject(s) - supercell , radar , weather radar , attenuation , geology , meteorology , physics , thunderstorm , optics , telecommunications , computer science
The article deals in detail with the case of observation of a cloud array characterized by a large (15 km) height of the upper boundary of cloud cover and the presence of areas with radar reflectivity of more than 60 dBZ by the DMRL-S meteorological radar installed in Valday (Novgorod region). Integrated application of the estimates of all measured parameters makes it possible to identify in this array the area where a rare weather phenomenon - a supercell - develops. The fact of formation of the hail area of large size is ascertained. It leads to the effect of depolarization attenuation - negative values of differential reflectivity of the echo signal of the meteorological targets. The coordinates of vertical flows are determined by analyzing data on the cross-correlation coefficient of polarization constituents of received signal. Then the obtained result is compared with the one obtained by means of estimations of the average radial velocity of particles, their much coincidence being shown. At an altitude of 5 km, areas with sharp local speed changes are observed, indicating the existence of strong vortices. Sequential analysis of the data obtained during the whole time of existence of the supercell leads to identification of a zone 5 km in diameter with a “jump” of magnitude radial velocity of particles in a layer 1 km high at a distance of 100 km. The scale of this zone, its location and the magnitudes of the parameters of the signal received from it indicate the formation of another rare weather phenomenon in it – the mesocyclone