Warm Arctic—cold continents: climate impacts of the newly open Arctic Sea
Open Access
- 1 January 2011
- journal article
- Published by Norwegian Polar Institute in Polar Research
- Vol. 30 (1)
- https://doi.org/10.3402/polar.v30i0.15787
Abstract
Recent Arctic changes are likely due to coupled Arctic amplification mechanisms with increased linkage between Arctic climate and sub-Arctic weather. Historically, sea ice grew rapidly in autumn, a strong negative radiative feedback. But increased sea-ice mobility, loss of multi-year sea ice, enhanced heat storage in newly sea ice-free ocean areas, and modified wind fields form connected positive feedback processes. One-way shifts in the Arctic system are sensitive to the combination of episodic intrinsic atmospheric and ocean variability and persistent increasing greenhouse gases. Winter 2009/10 and December 2010 showed a unique connectivity between the Arctic and more southern weather patterns when the typical polar vortex was replaced by high geopotential heights over the central Arctic and low heights over mid-latitudes that resulted in record snow and low temperatures, a warm Arctic—cold continents pattern. The negative value of the winter (DJF 2009/10) North Atlantic Oscillation (NAO) index associated with enhanced meridional winds was the lowest observed value since the beginning of the record in 1865. Wind patterns in December 2007 and 2008 also show an impact of warmer Arctic temperatures. A tendency for higher geopotential heights over the Arctic and enhanced meridional winds are physically consistent with continued loss of sea ice over the next 40 years. A major challenge is to understand the interaction of Arctic changes with climate patterns such as the NAO, Pacific North American and El Niño–Southern Oscillation.Keywords
This publication has 33 references indexed in Scilit:
- Considerations in the Selection of Global Climate Models for Regional Climate Projections: The Arctic as a Case Study*Journal of Climate, 2011
- Recurrence of Intraseasonal Cold Air Outbreak during the 2009/2010 Winter in Japan and its Ties to the Atmospheric Condition over the Barents-Kara SeaSOLA, 2011
- Arctic amplification: can the past constrain the future?Quaternary Science Reviews, 2010
- Role of Polar Amplification in Long-Term Surface Air Temperature Variations and Modern Arctic WarmingJournal of Climate, 2010
- Large-scale atmospheric circulation changes are associated with the recent loss of Arctic sea iceTellus A: Dynamic Meteorology and Oceanography, 2010
- The early twentieth century warm period in the European ArcticMeteorologische Zeitschrift, 2009
- The emergence of surface-based Arctic amplificationPublished by Copernicus GmbH ,2008
- The Present Climatic FluctuationThe Geographical Journal, 1948
- Die Erwarmung der ArktisICES Journal of Marine Science, 1937
- Communication from Captain Silas Bent upon the Routes to Be Pursued by Expeditions to the North PoleJournal of the American Geographical and Statistical Society, 1870