DOI: 10.5593/sgem2012/s17.v4001


Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 4, 241 - 252 pp


The North-Eastern part of Romania (Fig. 1) covers an area of 24 911km2, which
currently supports a population of over 2.5 million people. The geographic and
mathematical location of the studied area impose major climatic features. The climate is
temperate transitional (between oceanic temperate climate – specific to the Western
Europe and continental temperate climate – specific to the Eastern Europe). The
influences exerted by the continental climate are significant. They give the keynote to
the climate and generate a series of weather-specific risk events, common to continental
climate of temperate latitudes (frequent cold and heat waves, torrential rainfall followed
by periods of drought with considerable duration, violent dynamic events etc.). These
influences are overlapped by the Scandinavian-Baltic ones. From the altimetric point of
view, the studied geographic land covers three levels: mountain – in the west, hills and
plateaus – the center and hilly plain – in the east, with a general NW-SE orientation.
Geomorphological zoning generates a conspicuous climatic zoning.
Despite that our research results show clear evolutionary trends for air temperature, in
what concerns rainfall, certain small inconsistencies occur between CRU data and data
from weather stations, which will be discussed in detail within the text of the article.
These inconsistencies are mostly the result of methods used for graphic representation,
but also the result of the local rainfall mark which characterize rainfall data obtained at
weather stations. As for temperature, the 20th century exhibits a generally ascendant
tendency [1] for average and extreme values, which ranges between 0.8 and 10C at the
analyzed stations.
Rainfall amounts taken in temporal intervals of 10 years each followed a sinusoidal
evolution with positive and negative deviations from the interval average, having a
present rise in deviations above the normal values. Climatic statistics show an increase
in the amount of water received from rainfall in the area with 20mm in 1901-2009.
However, this water precipitates from the atmosphere much more violently [2, 1],
resulting in significant increase, but for short periods of time, in pluviometric input and
river discharge. This is followed by long intervals of rainfall deficit, which has a strong
negative impact on agriculture and ultimately on the environment.
Climate and its current evolution display an immediate reflex for all the components of
the natural and socio-economic environment [3]. The most conspicuous are the effects
on hidrography (reserves, flow volumes, flow parameters, water quality etc) and
vegetation of the studied territory (species in extinction or expansion, bioaccumulation
of vegetation mass and decrease of its annual growth volumes).

Keywords: climate evolution, forecasting, atmospheric warming, CRU,
continentalization of rainfall events