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The Chair of Climatology of the Warsaw University was established in the autumn of 1951 within the framework of the Institute of Geography, which made a part of the Faculty of Biology and the Sciences of the Earth. In 1969 the Institute was separated from the Faculty and established as a self-standing unit – the Institute of Geography of the Warsaw University. The Chair was at that time transformed in to the Department. In 1976 the Faculty of Geography and Regional Studies was establishcd and the Department of Climatology constituted a part of the Institute of Physico-Geographical Sciences. The first head of the Department was Professor Romuald Gumiński (1951-1952), followed by Professor Wincenty Okołowicz (1952-1974), and since then - Professor Maria Stopa-Boryczka. Ass. Professor Zofia Kaczorowska was for many years a highly valued employee of the Department (1951-1972). The research conducted at the Department encompasses a very wide problem area. The effects of this research include the elaborates concerning the whole of Poland, the detailed analyses devoted to various aspects of the climate of the North-eastern Poland, studies of the climate of Warsaw and its surroundings. The theoretical statistical research was conducted on relations between the elements of climate and their dependence upon the geographical factors, along with the studies of climate changes, and of many other domains. During the 50 years of existence of the Department of Climatology 352 persons obtained in it the degree of Master of Science, and 28 persons were conferred the doctoral degrees.
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Researches of urban verdure effect on thermic and humidity conditions, carried out for 1971-75 by Warsaw University, proved that the influence occured very distinctly in summer months. The influence of grounds with vegetation on air temperature and humidity occurs for areas at least of 3000 m² Then it can be sensible 1,5 m high over the ground surface. The verdure terrains cause decreasing of the temperature especially in the evening and the night, as well as increasing of the air humidity (humidity pressure and relative humidity). The temperature is decreased mostly by a presence of trees, and the humidity is increased especially by abundant grass cover and a protection from winds. The lawns are favourable to evening temperature inversion. The conclusion from the obtained results in that a remissive effect of lawns and parks on the climate is the strongest when the verdure is differentiated as grass and shrubbery and trees.
The purpose of the study is to obtain the answer to the question weather urban development has influence - and if so - on interdiurnal changes of air temperature. The answer is of considerable importance because many climatological stations, from which data for temperature changes studies comes from, are placed in towns. Data taken for the study were the daily values of mean daily temperature, maximum and minimum temperature for the 5 year period 1961-1965 from 5 climatological stations in Warsaw. The analyais of mean monthly values of temperature changes, frequency of changes of different size as well as course of temperature in chosen months has proved, that urban development most strongly influences interdiurnal changes of the minimal temperature, decreasing its average value and the frequency of appearance of extremely high changes. Such influence is most strongly observed in winter, when on the turn of spring and summer in the town's center interdiurnal changes of the maximum temperature may be a little higher. The influence of urban development on air temperature changes turned out to be dependent on the amount of cloudiness and wind velocity (bigger influence when smaller cloudiness and low wind velocity), and also from the direction of wind (larger changes on the windward side of the city).
On the basis of two time sequences (for 1871-1970 and 1951-1994) of average monthly temperatures and monthly precipitation sums in Warsaw the nature of relation between these two quantities was analysed. Months were divided into three classes of equal cardinality: the cold, the normal and the warm ones and the dry, the normal and the rainy ones. It was stated that between November and February the cold months have precipitation at the normal level or below, while warm months have precipitation at the normal level or above. From May to September the situation is reversed: the cold months are more often rainy, while wann ones - dry. The months of March, April and October are of transitory character, since in the case of these months the cold dry and rainy as well as warm dry and rainy months occur with equal probability (Table 1 ). In the second part of the paper the frequency and the nature of anomalous months were considered, with the normal months understood as such during which temperature and precipitation are contained in the interval [multiannual average - standard deviation; multiannual average + standard deviation]. It was stated that during the cooler part of the year greater negative than positive deviations of temperature occur, and that frequently cold and very cold months are dry, while during summer there are bigger positive deviations and the warm as well as very warm months are often dry, and never rain (Table 2). The temperature and the precipitation in the months with extreme thermal and/or precipitation features were put together (Table 3) and the nature of atmospheric circulation in the anomalus months was analysed. It turned out that in winter (from November to February) the abnormally cold months feature the domination of anticyclonic eastern and northern circulation, while the abnormally warm months - domination of cyclonic western and south-western circulation. In spring (from March to May) cold months feature domination of the circulation types from the northern sector, both cyclonic and anticyclonic ones, while warm months - from the southern sector. In summer (from June to September) during the cold months cyclonic circulation from the northern sector, and especially from the north-western sector dominates, while during the warm months - anticyclonic circulation from the southern and eastern sectors. During cold October the anticyclonic circulation from the North or the East appears most often, while during warm October - cyclonic or anticyclonic circulation from the southern or south-western sector. During the whole year the dry months feature very high frequency of the anticyclonic circulation types ( especially the eastern ones), while the rainy months - the cyclonic types (Table 4).
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The beginnings of the research on the urban climate in the Department of Climatology are associated with the start of functioning in 1957 of the downtown Climatological Station, located within the central campus of the University of Warsaw. The studies from the domain of urban climate, dane during the 50 years of existence of the Department, concern mainly the climate of Warsaw. These studies can be classified into: - publications devoted to various elements of climate of Poland, in which Warsaw was also accounted for (W. Okołowicz, Z. Kaczorowska, M. Stopa), - Master's Theses devoted to various fragments of town or to various elements of climate in Warsaw, - doctoral dissertations devoted to various problems related to the climate of Warsaw (J. Boryczka, U. Kossowska, J. Wawer), - work done at the orders from various institutions, such as transport of air pollution, influence of urban green spaces on climate, eco-physiographic foundations for environmental engineering at the housing estate Białołęka Dworska (elaborated by the entire team of the Department of Climatology), - book publications including statistical analyses of relations between the particular elements of climate in Warsaw and of the secular climate changes together with its cyclical character (J. Boryczka, M. Stopa-Boryczka, and others), - papers published in various journals, mainly in „Prace i Studia IG UW” and in „Prace i Studia Geograficzne”, concerning many different problems related to the climate of Warsaw. During 50 years an evolution of the research domain could be observed: from cognition of the primary features of the climate of Warsaw, through the study of the differentiation between the centre and the suburban zone, to the micro-climatic studies and the theoretical-statistical elaborates. The results of the thus diversified research projects, dispersed until now among the both published and unpublished reports, make up a rich material for a detailed monograph of the climate of Warsaw.
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Pogoda upalna w Warszawie (1947–2010)

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In the paper the frequency of days with maximum air temperature t max > 30°C and t max > 35°C, as well as of days with minimum temperature t min > l8°C and t min > 20°C, in Warsaw during the period 1947-2010 were investigated (Fig. 1, 2, Tab. 1). Numbers of mentioned days distinctly increased after 1900; the least numbers were in 1976-1980, the largest ones in 2006-2010 (table 1). In the 2010 the highest frequency of the warm nights (t min > l8°C - 22) and very warm (t min > 20°C - 6) occurred (Tab. 2). During the period 1947- 2010 the 35 heat waves were observed. In the 2010 were 4 heat waves, but the longest ones occurred in 1994 (10 days) and 1971 (9 days). Comparison of obtained results with the data from the first half of XX century shows that contemporary heats are not a new phenomenon in aur climate - the summers in 1921, 1939, 1943, 1944 and other years were also very hot.
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