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Methodology of Lithuanian climate atlas mapping

Valiukas D., Galvonaitė A., Česnulevičius A.

Geodesy and Cartography

2015

Vol. 64, no. 1

101--112

Climate atlases summarize large sets of quantitative and qualitative data and are results of complex analytical cartographic work. These special geographical publications summarize long term meteorological observations, provide maps and figures which characterise different climate elements. Visual information is supplemented with explanatory texts. A lot of information on short and long term changes of climate elements were provided in published Lithuanian atlases (Atlas of Lithuanian SDR, 1981; Climate Atlas of Lithuania, 2013), as well as in prepared but unpublished Lithuanian Atlas (1989) and in upcoming new national atlas publications (National Atlas of Lithuania. 1st part, 2014). Climate atlases has to be constantly updated to be relevant and to describe current climate conditions. Comprehensive indicators of Lithuanian climate are provided in different cartographic publications. Different time periods, various data sets and diverse cartographic data analysis tools and visualisation methods were used in these different publications.

Atlasy klimatyczne powstają w wyniku analiz wielu danych o charakterze ilościowym i jakościowym. Ten specjalny rodzaj publikacji geograficznej podsumowuje długoterminowe obserwacje meteorologiczne, dostarcza map i wykresów, które charakteryzują różne elementy klimatu. Zawiera też uzupełniające informacje opisowe. W atlasach litewskich (Atlas of Lithuanian SDR, 1981; Climate Atlas of Lithuania, 2013) opublikowano wiele ciekawych informacji na temat krótko i długookresowych zmian klimatu. Część z nich znajdzie się w przygotowywanym do druku Litewskim Atlasie Narodowym (National Atlas of Lithuania. 1st part, 2014). W artykule przedstawiono założenia metodyczne oraz przykłady map klimatycznych, które znajdą się w atlasie narodowym.

The atmospheric circulation patterns during dry periods in Lithuania

Rimkus E., Kažys J., Valiukas D., Stankunavičius G.

Oceanologia

2014

No. 56 (2)

223--239

This paper reveals the atmospheric circulation patterns during dry periods in Lithuania.~The research covers the period from 1961 to 2010. Atmospheric circulation features were analysed using the Hess and Brezowski classification of macro-circulation forms, NAO and AO indices, a 500 hPa geopotential height field and the Tibaldi-Molteni blocking index. Different phases of the dry period (developing, persisting and attenuation) were evaluated individually. Also, the regional differences of dry period formation were investigated. In general dry periods are determined by a decrease in zonal and an increase in meridional circulation forms as well as the atmospheric blocking process over the Baltic region longitudinal belt 0-20 days prior to the start of the dry period. An especially strong shift from general circulation patterns are observed during the developing phase of a dry period. Drought persistence in the Baltic region is almost always predetermined by strong anticyclonic circulation. Most drought development stages are associated with negative NAO/AO phases.