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Georgescu F.,National Meteorological Administration NMA | Stefan S.,University of Bucharest
Romanian Reports in Physics | Year: 2010

Generally, the severe weather phenomena are associated with cyclonic activity over Romania. The aim of this paper is to assess a correlation between the cyclone frequency into a representative area for Romania and the circulation types conform to "COST733 Catalogue". The selected domain was between 10° and 35° E longitude and 35° and 55° N latitude. The selected area is similar to Domain 10 from COST733 Catalogue. The Mediterranean cyclones, reaching this domain from the south-west can be accounted for. The cyclones of Icelandic origin with north-west to south-east trajectories sometimes are reactivated in Central Europe through cold air penetrating the upper troposphere and reach over Romanian territory. A peculiar category is that of cyclones moving along retrograde tracks. Using daily NCEP/NCAR reanalysis data for the sea level pressure, a subjective analysis of cyclone frequency has been performed for the cold period (the 1st of November-the 31st of March) between 1996-2002 years. All closed cyclonic nuclei with a pressure equal to or lower than 1,015 hPa in the sea-level pressure field were accounted for using LWT2 Cost 733 catalogue, the frequency of circulation types for the analyzed interval has been established. The anticyclonic circulation types seem to be the more frequent and, by the other hand, the graphical correlations show that the cyclonic activity in the domain is important especially during the periods with eastern or south-eastern dominant air circulation. Source


Spinoni J.,European Commission - Joint Research Center Ispra | Szalai S.,Szent Istvan University | Szentimrey T.,Hungarian Meteorological Service OMSZ | Lakatos M.,Hungarian Meteorological Service OMSZ | And 35 more authors.
International Journal of Climatology | Year: 2015

The Carpathians are the longest mountain range in Europe and a geographic barrier between Central Europe, Eastern Europe, and the Balkans. To investigate the climate of the area, the CARPATCLIM project members collected, quality-checked, homogenized, harmonized, and interpolated daily data for 16 meteorological variables and many derived indicators related to the period 1961-2010. The principal outcome of the project is the Climate Atlas of the Carpathian Region, hosted on a dedicated website (www.carpatclim-eu.org) and made of high-resolution daily grids (0.1° × 0.1°) of all variables and indicators at different time steps. In this article, we analyze the spatial and temporal variability of 10 variables: minimum, mean, and maximum temperature, daily temperature range, precipitation, cloud cover, relative sunshine duration, relative humidity, surface air pressure, and wind speed at 2 m. For each variable, we present the gridded climatologies for the period 1961-2010 and discuss the linear trends both on an annual and seasonal basis. Temperature was found to increase in every season, in particular in the last three decades, confirming the trends occurring in Europe; wind speed decreased in every season; cloud cover and relative humidity decreased in spring, summer, and winter, and increased in autumn, while relative sunshine duration behaved in the opposite way; precipitation and surface air pressure showed no significant trend, though they increased slightly on an annual basis. We also discuss the correlation between the variables and we highlight that in the Carpathian Region positive and negative sunshine duration anomalies are highly correlated to the corresponding temperature anomalies during the global dimming (1960s and 1970s) and brightening (1990s and 2000s) periods. © 2014 Royal Meteorological Society. Source

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