The ‘Warm-Arctic/Cold-Continents’ pattern during 1901-2010

Chen, L. and Francis, J. and Hanna, Edward and UNSPECIFIED (2018) The ‘Warm-Arctic/Cold-Continents’ pattern during 1901-2010. International Journal of Climatology . ISSN 0899-8418

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Abstract

The ‘Warm-Arctic/Cold-Continents’ (WACC) winter weather pattern is investigated using the European Centre for Medium-Range Weather Forecasts 20th Century reanalysis data (ERA20C) spanning 1901-2010. Both the 1920-1940 and 1990-2010 periods are characterized by Arctic amplification (AA) and mid-latitude continental cooling, although the Arctic warming signal for 1990-2010 is twice as strong as that for 1920-1940. Significant weakening in the mid-latitude poleward temperature gradient and zonal wind, wavier upper-level flow character, and strong regional blocking frequency/intensity changes are also detected during both AA periods. These results based on statistical analyses highlight the possible role of AA in affecting mid-latitude weather patterns, but further work is needed to quantify the influence of AA on particular mid-latitude dynamical features.

Keywords:warm Arctic, Cold Continents, jet stream, blocking frequency/intensity, Arctic amplification, mid-latitude weather
Subjects:F Physical Sciences > F860 Climatology
Divisions:College of Science > School of Geography
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ID Code:32149
Deposited On:19 Jun 2018 10:00

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