Long-term changes in drought indices in eastern and central Europe
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JAAGUS, Jaak, AASA, Anto, ANISKEVICH, Svetlana, NOI, Autori, BOINCEAN, Boris. Long-term changes in drought indices in eastern and central Europe. In: International Journal of Climatology, 2022, nr. 1(42), pp. 225-249. ISSN 0899-8418. DOI: https://doi.org/10.1002/joc.7241
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International Journal of Climatology
Numărul 1(42) / 2022 / ISSN 0899-8418 /ISSNe 1097-0088

Long-term changes in drought indices in eastern and central Europe

DOI:https://doi.org/10.1002/joc.7241

Pag. 225-249

Jaagus Jaak1, Aasa Anto1, Aniskevich Svetlana2, Noi Autori1, Boincean Boris3
 
1 University of Tartu, Estonia,
2 Geology and Meteorology Centre, Riga,
3 Selectia Research Institute of Field Crops
 
 
Disponibil în IBN: 4 martie 2022


Rezumat

 This study analyses long-term changes in drought indices (Standardised Precipitation Index—SPI, Standardised Precipitation–Evapotranspiration Index—SPEI) at 1 and 3 months scales at 182 stations in 11 central and eastern European countries during 1949–2018. For comparative purposes, the necessary atmospheric evaporative demand (AED) to obtain SPEI was calculated using two methods, Hargreaves-Samani (SPEIH) and Penman-Monteith (SPEIP). The results show some relevant changes and tendencies in the drought indices. Statistically significant increase in SPI and SPEI during the cold season (November–March), reflecting precipitation increase, was found in the northern part of the study region, in Estonia, Latvia, Lithuania, northern Belarus and northern Poland. In the rest of study domain, a weak and mostly insignificant decrease prevailed in winter. Summer season (June–August) is characterized by changes in the opposite sign. An increase was observed in the north, while a clear decrease in SPEI, reflecting a drying trend, was typical for the southern regions: the Czech Republic, Slovakia, Hungary, Romania, Moldova and southern Poland. A general drying tendency revealed also in April, which was statistically significant over a wide area in the Czech Republic and Poland. Increasing trends in SPI and SPEI for September and October were detected in Romania, Moldova and Hungary. The use of SPEI instead of SPI generally enhances drying trends. 

Cuvinte-cheie
Central and Eastern European Countries, Central Europe, Czech Republic, Drought indices, Evaporative demands, Long term change, Penman Monteith, Precipitation indices