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CYCLONIC ACTIVITY IN COLD SEASON OVER TERRITORIES OF BELARUS AND UKRAINE AND ITS RELATION TO THE WARM SEASON DROUGHTS
INNA SEMENOVA
orcid.org/0000-0003-3383-4848
; Odessa State Environmental University, Ukraine
KATSIARYNA SUMAK
; Republican Center for Hydrometeorology and Control of Radioactive Contamination and Environmental Monitoring of the Republic of Belarus
Sažetak
Abstract. Cyclonic activity is a main mechanism for replenishing the soil moisture content due
to precipitation. Low number of cyclones in winter can become a trigger for a drought in the
subsequent summer period. This paper examines the conditions of cyclonic activity over the
territory of Ukraine and Belarus and the drought frequency under current climate using syn-
optic analysis and meteorological drought indices. Since the appearance of a drought is associ-
ated with a certain blocking structure of the high-level pressure field, such patterns have been
obtained and examined using proposed blocking index. Also it is shown that a decreasing of
the amount of southern cyclones in winter has been accompanied by an increasing of drought-
ness in summer, mainly over the southern regions of Ukraine. At the same time some shifting
of the tracks of southern cyclones toward to the territory of Belarus was observed.
Ključne riječi
cyclone; cyclonic activity; drought; blocking process
Hrčak ID:
201613
URI
Datum izdavanja:
1.6.2018.
Posjeta: 822 *