caa a22 4500 605472831 CHVBK 20210128100340.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s00382-015-2508-2 doi (NATIONALLICENCE)springer-10.1007/s00382-015-2508-2 Seasonal modes of dryness and wetness variability over Europe and their connections with large scale atmospheric circulation and global sea surface temperature [Elektronische Daten] [M. Ionita, C. Boroneanṭ, S. Chelcea] The relationship between the seasonal modes of interannual variability of a multiscalar drought index over Europe and the large-scale atmospheric circulation and sea surface temperature (SST) anomaly fields is investigated through statistical analysis of observed and reanalysis data. It is shown that the seasonal modes of dryness and wetness variability over Europe and their relationship with the large-scale atmospheric circulation and global SST anomaly fields differ from one season to another. During winter, the dominant modes of dryness and wetness variability are influenced by the Arctic Oscillation (AO)/North Atlantic Oscillation (NAO), the Scandinavian pattern, the East Atlantic pattern and the East Atlantic/Western Russia pattern. The spring dryness/wetness modes are influenced mainly by the AO, Polar/Eurasian patterns and the Atlantic Multidecadal Oscillation conditions. The phases (positive or negative) and the superposition of these large scale variability modes play a significant role in modulating the drought conditions over Europe. During summer, the atmospheric blocking is one of the main drivers of dryness and wetness conditions, while during autumn dryness/wetness conditions variability can be related to the NAO or with a wave train like pattern in the geopotential height at 850mb, which develops over the Atlantic Ocean and extends up to Siberia. It is also found that the response of the dryness and wetness conditions to global SST is more regional in summer, compared to the other seasons, when local processes may play a more important role. Springer-Verlag Berlin Heidelberg, 2015 Drought variability nationallicence Standardized precipitation evapotranspiration index nationallicence Standardized precipitation index nationallicence Atmospheric circulation nationallicence NAO nationallicence Ionita M. Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bussestrasse 24, 27570, Bremerhaven, Germany aut Boroneanṭ C. Center for Climate Change, Geography Department, University Rovira I Virgili, Tortosa, Spain aut Chelcea S. National Institute of Hydrology and Water Management, Bucharest, Romania aut Climate Dynamics Springer Berlin Heidelberg 45/9-10(2015-11-01), 2803-2829 0930-7575 45:9-10<2803 2015 45 382 https://doi.org/10.1007/s00382-015-2508-2 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00382-015-2508-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ionita M. Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bussestrasse 24, 27570, Bremerhaven, Germany aut NATIONALLICENCE 700 1- Boroneanṭ C. Center for Climate Change, Geography Department, University Rovira I Virgili, Tortosa, Spain aut NATIONALLICENCE 700 1- Chelcea S. National Institute of Hydrology and Water Management, Bucharest, Romania aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 45/9-10(2015-11-01), 2803-2829 0930-7575 45:9-10<2803 2015 45 382