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Seasonal and Decadal Variation of Weather and Climate Extremes in the Arctic

Seasonal and Decadal Variation of Weather and Climate Extremes in the Arctic
Type: 
Poster
Brooke C. Stewart1, John E. Walsh2, William L. Chapman3
1Department of Atmospheric Sciences, Univeristy of Illinois, 105 S. Gregory Street, Urbana, IL, 61801, USA, stewar14 [at] atmos [dot] uiuc [dot] edu
2International Arctic Research Center (IARC), University of Alaska Fairbanks, PO Box 757340, Fairbanks, AK, 99775, USA
3Department of Atmospheric Sciences, University of Illinois, 215 Atmospheric Sciences Building, MC 223, Urbana, IL, 61801, USA

Decadal mean temperatures show a warming over the past 60 years at individual stations in Alaska and the frequency of extremes (defined as the upper and lower percentiles) show corresponding decadal variations for some, but not all stations. The ratio of highest-percentile to lowest-percentile temperature occurrences has increased in the past decade, especially in the colder half of the year. Occurrences of precipitation extremes show more varied trends over the past 60 years, although there are indications that heavy precipitation events track the decadal mean precipitation amounts and that the frequencies of heavy precipitation vary inversely with the occurrence of extended dry periods. We will present the spatial and seasonal distributions of the variations of extremes of temperature and precipitation in the context of changing climatic means in Alaska.

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National Science Foundation | Division of Arctic Sciences
National Science Foundation
National Oceanic and Atmospheric Administration
National Oceanic and Atmospheric Administration
International Arctic Systems for Observing the Atmosphere
International Arctic Systems for Observing the Atmosphere
Study of Environmental Arctic Change
Study of Environmental Arctic Change
Arctic System Science Program
Arctic System Science Program
US Arctic Research Commission
US Arctic Research Commission
North Slope Science Initiative
North Slope Science Initiative
International Arctic Science Committee
International Arctic Science Committee
Arctic Ocean Sciences Board
Arctic Ocean Sciences Board
Alaska Ocean Observing System
Alaska Ocean Observing System
Department of Energy
Department of Energy
National Aeronautics and Space Administration
National Aeronautics and Space Administration
World Wildlife Fund
WWF
Association of Polar Early Career Scientists
Association of Polar Early Career Scientists
Bureau of Land Management
Bureau of Land Management
International Study of Arctic Change
International Study of Arctic Change
ArcticNet
ArcticNet
DAMOCLES
Developing Arctic Modeling and Observing Capabilities for Long-term Environmental Studies

This work is supported by the National Science Foundation (NSF) under the ARCUS Cooperative Agreement ARC-0618885. Any opinions, findings, and conclusions or recommendations expressed do not necessarily reflect the views of the NSF.