부산대학교 도서관

Keywords: Fennoscandia; Arctic; Precipitation; Extremes; Climate change; Atmospheric circulation pattern Abstract Extreme precipitation events (EPEs) have a major impact across Arctic Fennoscandia (AF). Here we examine the spatial variability of seasonal 50-year trends in three EPEs across AF for 1968--2017, using daily precipitation data from 46 meteorological stations, and analyse how these are related to contemporaneous changes in the principal atmospheric circulation patterns that impact AF climate. Positive trends in seasonal wet-day precipitation (PRCPTOT) are widespread across AF in all seasons except autumn. Spring (autumn) has the most widespread negative (positive) trends in consecutive dry days (CDD). There is less seasonal dependence for trends in consecutive wet days (CWDs), but the majority of the stations show an increase. Clear seasonal differences in the circulation pattern that exerted most influence on these AF EPE trends exist. In spring, PRCPTOT and CDD are most affected by the Scandinavian pattern at more than half the stations while it also has a marked influence on CWD. The East Atlantic/Western Russia pattern generally has the greatest influence on the most station EPE trends in summer and autumn, yet has no effect during either spring or winter. In winter, the dominant circulation pattern across AF varies more between the different EPEs, with the North Atlantic Oscillation, Polar/Eurasia and East Atlantic patterns all exerting a major influence. There are distinct geographical distributions to the dominant pattern affecting particular EPEs in some seasons, especially winter, while in others there is no discernible spatial relationship. Author Affiliation: (1) British Antarctic Survey, Natural Environment Research Council, Cambridge, UK (2) Weather and Climate Change Impact Research, Finnish Meteorological Institute, Helsinki, Finland (3) Department of Geographical and Historical Studies, University of Eastern Finland, Joensuu, Finland (4) Department of Model and Climate Analysis, Norwegian Meteorological Institute, Oslo, Norway (a) gjma@bas.ac.uk Article History: Registration Date: 05/20/2020 Received Date: 06/18/2019 Accepted Date: 05/20/2020 Online Date: 06/12/2020 Byline: