Origin of Variability in Northern Hemisphere Winter Blocking on Interannual to Decadal Time Scales

Gollan, Gereon, Greatbatch, Richard John and Jung, Thomas (2015) Origin of Variability in Northern Hemisphere Winter Blocking on Interannual to Decadal Time Scales Geophysical Research Letters, 42 (22). 10,037-10,046. DOI 10.1002/2015GL066572.

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Variability of mid-latitude blocking in the boreal winter northern hemisphere is investigated for the period 1960/61 to 2001/02 by means of relaxation experiments with the model of the European Center for Medium-Range Weather Forecasts. It is shown that there is pronounced interannual and decadal variability in blocking, especially over the Eurasian continent, consistent with previous studies. The relaxation experiments show that realistic variability in the tropics can account for a significant part of observed interannual blocking variability, but also that about half of the observed variability can only be explained by extratropical tropospheric variability. On the quasi-decadal time scale, extratropical sea surface temperature and sea-ice, in addition to tropical variability, play a more important role. The stratosphere, which has been shown to influence interannual variability of the North Atlantic Oscillation in previous studies, has no significant influence on blocking according to our analysis.

Document Type: Article
Additional Information: WOS:000368343200053
Keywords: Blocking variability; ERA-40; relaxation experiments; interannual variability; decadal variability; ISOLAA, SPP 1158 Antarktisforschung
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
Refereed: Yes
DOI etc.: 10.1002/2015GL066572
ISSN: 0094-8276
Related URLs:
Projects: ISOLAA, SPP 1158 Antarktisforschung
Date Deposited: 09 Nov 2015 12:31
Last Modified: 10 Apr 2017 08:09
URI: http://eprints.uni-kiel.de/id/eprint/30182

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