Universität zu Köln

Santos, Joao A., Woollings, Tim ORCID: 0000-0002-5815-9079 and Pinto, Joaquim G. (2013). Are the Winters 2010 and 2012 Archetypes Exhibiting Extreme Opposite Behavior of the North Atlantic Jet Stream? Mon. Weather Rev., 141 (10). S. 3626 - 3641. BOSTON: AMER METEOROLOGICAL SOC. ISSN 1520-0493

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Abstract

The atmospheric circulation over the North Atlantic-European sector experienced exceptional but highly contrasting conditions in the recent 2010 and 2012 winters (November-March, with the year dated by the relevant January). Evidence is given for the remarkably different locations of the eddy-driven westerly jet over the North Atlantic. In the 2010 winter the maximum of the jet stream was systematically between 30 degrees and 40 degrees N (south jet regime), whereas in the 2012 winter it was predominantly located around 55 degrees N (north jet regime). These jet features underline the occurrence of either weak flow (2010) or strong and persistent ridges throughout the troposphere (2012). This is confirmed by the very different occurrence of blocking systems over the North Atlantic, associated with episodes of strong cyclonic (anticyclonic) Rossby wave breaking in 2010 (2012) winter. These dynamical features underlie strong precipitation and temperature anomalies over parts of Europe, with detrimental impacts on many socioeconomic sectors. Despite the highly contrasting atmospheric states, mid- and high-latitude boundary conditions do not reveal strong differences in these two winters. The two winters were associated with opposite ENSO phases, but there is no causal evidence of a remote forcing from the Pacific sea surface temperatures. Finally, the exceptionality of the two winters is demonstrated in relation to the last 140 years. It is suggested that these winters may be seen as archetypes of North Atlantic jet variability under current climate conditions.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Santos, Joao A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Woollings, Tim UNSPECIFIED orcid.org/0000-0002-5815-9079 UNSPECIFIED Pinto, Joaquim G. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-475411
DOI:	10.1175/MWR-D-13-00024.1
Journal or Publication Title:	Mon. Weather Rev.
Volume:	141
Number:	10
Page Range:	S. 3626 - 3641
Date:	2013
Publisher:	AMER METEOROLOGICAL SOC
Place of Publication:	BOSTON
ISSN:	1520-0493
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ROSSBY-WAVE-BREAKING; ATMOSPHERIC BLOCKING; PRECIPITATION EXTREMES; TEMPERATURE EXTREMES; HEMISPHERE BLOCKING; IBERIAN PENINSULA; CLIMATE; OSCILLATION; VARIABILITY; REANALYSIS Multiple languages Meteorology & Atmospheric Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47541