Aerul şi Apa: Componente ale Mediului (Mar 2014)
CHARACTERISTICS OF THERMAL ANOMALIES OCCURRING DURING THE COLD SEASON ABOVE BUCHAREST, AS DETERMINED ON THE BASIS OF RADIO AND SATELLITE SOUNDINGS
Abstract
This paper uses the comparative method in order to highlight the thermal anomalies, the impact of atmospheric circulation and the air masses through specific situations. Our preliminary study employs radio sounding data from Bucharest-Băneasa weather station, and this method is applied for an altitude interval bounded by Earth’s surface and the geopotential surface of 900hPa. Thus, the results have been obtained from radio soundings up to the 900 hPa level, which corresponds to an altitude of 1000 meters, because above this level, there is a tendency towards generalization due to the decreased influence of the subjacent active surface and the impact of the particularities of the general atmospheric circulation above Bucharest. The aim of the study was to explain the temperature distribution through statistical shape/form indices and to measure their degree of flattening and asymmetry. Processing the radio – soundings data complemented, when not measured, by the remote sensing data available after 2007, involved the statistical modeling of time series for the cold season (October to March), which meant analyzing the temporal variations and the prognosis for the evolution of meteorological and climatic elements. A comparison of the values taken by different parameters of the analyzed thermal regime could not be achieved without a more detailed presentation of the thermal regime up to 900 hPa, by entirely taking into account thermal anomalies, exceptional thermal gradients and the altitude/height of isotherms directly involved in the analyzed phenomenon, and also by directly correlating these elements with the characteristic synoptic situations.
