This paper analyses the pluviometric deficit regime during the cold semester, in the Oltenia Plain and the Southern Dobruja Plateau in the last half of the century (beginning with 1961), by treating comparatively this issue. The climatic evolutions in the last interval of time refer both to the tendency of sudden fall of atmospheric precipitations and to the tendency of air temperature increase in the last decades. The scanty precipitations registered for years on Earth extended surfaces led to phenomena of drought, which have been signalled also on the territory of our country, including in the two analysed regions. The significant differences we have found prove clearly the tendency of climate aridity in these regions situated in the two southern, south-western and namely south-eastern extremes of Romania.
The paper analyzes the issue of late spring and early autumn cold waves. We present an evaluation criterion of these climatic hazard phenomena with a high degree of danger, which can damage the crops in their different development stages, vulnerable to the temperatures severe fall. The main climatic hazard phenomenon associated with these is the late spring and early autumn frost. Their occurrence can lead to significant economic damages. The paper analyzes weather severe cooling in the interval 25-29 March2013. Taking into account global climate warming and the increase of weather variability, it is expected that the frequency of these phenomena increases, as well as the degree of crop damage. The paper is useful to researchers in climate domain, agrometeorologists, master graduates and students.
Abstract: During the spring and summer of 2010, climatic evolutions were atypical. Following a severe 2009-2010 winter, the spring was cold and excessively rainy until March, normal from the pluviometric point of view in April and very rainy in May. The weather was cold in June, cool in July and it became normal in thermal terms in the last summer month, August, registering an upward average trend during both seasons. The cold weather started in the first part of the autumn of 2009, being a characteristic of the entire period. The rainfall regime registered higher values than the normal in June (very rainy), it was normal in July and less rainy in August. The combination between the thermal and pluviometric regimes during the analysed period led to the development of a real agroclimatic risk situation, as emphasized in the present paper. This analysis is useful for climatologists and agroclimatologists, emphasizing unusual aspects of the Oltenia climate.
Abstract: The present paper analyses the types of synoptic situations that generated obvious weather instability within Oltenia between May 25 and June 6. Weather instability is usually associated with pronounced coolings that brought to the occurring of monthly minimum values or event o absolute minimum values for May and June during the abovementioned interval. In certain years, in the same period, there occurred rain showers that generated great precipitation amounts and floods in certain parts of Oltenia, while other times, hail registered exceptional dimensions and, consequently, important material damages (June 2, 1995, Marinică, 1995, 2005). We consider this paper is extremely useful for the researchers involved in weather forecast and climatology.
Abstract: The present paper (a case study) aims at analyzing the synoptic conditions registered between the 18th and the 23rd of September 2005, which led to extremely abundant rainfalls fallen on 12-24 hour intervals and to severe floods in Oltenia, as well as within all the southern regions of the country. The registering of such a situation in the mentioned interval brought to the sixth flood wave in Romania, which had catastrophic consequences. Such synoptic situation usually appears in rainy years in autumn and display an unusual intensity of the precipitation phenomena once in 30-35 years. Rainy years are usually registered in the years characterized by a minimum solar activity. The study also approaches this issue from the point of view of the climatic risk. The results are important for the study of the climatic risk of the increased rainfalls as well as for the forecast activity.