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contributor authorVikhamar-Schuler, Dagrun
contributor authorIsaksen, Ketil
contributor authorHaugen, Jan Erik
contributor authorTømmervik, Hans
contributor authorLuks, Bartlomiej
contributor authorSchuler, Thomas Vikhamar
contributor authorBjerke, Jarle W.
date accessioned2017-06-09T17:13:04Z
date available2017-06-09T17:13:04Z
date copyright2016/09/01
date issued2016
identifier issn0894-8755
identifier otherams-81241.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4224222
description abstractn recent years extreme winter warming events have been reported in arctic areas. These events are characterized as extraordinarily warm weather episodes, occasionally combined with intense rainfall, causing ecological disturbance and challenges for arctic societies and infrastructure. Ground-ice formation due to winter rain or melting prevents ungulates from grazing, leads to vegetation browning, and impacts soil temperatures. The authors analyze changes in frequency and intensity of winter warming events in the Nordic arctic region?northern Norway, Sweden, and Finland, including the arctic islands Svalbard and Jan Mayen. This study identifies events in the longest available records of daily temperature and precipitation, as well as in future climate scenarios, and performs analyses of long-term trends for climate indices aimed to capture these individual events. Results show high frequencies of warm weather events during the 1920s?30s and the past 15 years (2000?14), causing weak positive trends over the past 90 years (1924?2014). In contrast, strong positive trends in occurrence and intensity for all climate indices are found for the past 50 years with, for example, increased rates for number of melt days of up to 9.2 days decade?1 for the arctic islands and 3?7 days decade?1 for the arctic mainland. Regional projections for the twenty-first century indicate a significant enhancement of the frequency and intensity of winter warming events. For northern Scandinavia, the simulations indicate a doubling in the number of warming events, compared to 1985?2014, while the projected frequencies for the arctic islands are up to 3 times higher.
publisherAmerican Meteorological Society
titleChanges in Winter Warming Events in the Nordic Arctic Region
typeJournal Paper
journal volume29
journal issue17
journal titleJournal of Climate
identifier doi10.1175/JCLI-D-15-0763.1
journal fristpage6223
journal lastpage6244
treeJournal of Climate:;2016:;volume( 029 ):;issue: 017
contenttypeFulltext


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