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Solar modulation of Northern Hemisphere winter blocking

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Barriopedro Cepero, David and García Herrera, Ricardo and Huth, Radan (2008) Solar modulation of Northern Hemisphere winter blocking. Journal of Geophysical Research-Atmospheres, 113 (D14118). ISSN 0148-0227

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Official URL: http://dx.doi.org/10.1029/2008JD009789




Abstract

The blocking response to the 11-year solar cycle is investigated for 44 winters (1955-1999) and stratified according to the level of solar activity and the phase of the Quasi-Biennial Oscillation (QBO). Several blocking features are modulated by solar activity, irrespective of the QBO phase, but the responses amplify under the QBO-west phases. Solar activity modulates the preferred locations for blocking occurrence over both Oceans, causing local frequency responses therein. Over the Pacific Ocean high/low solar activity induces an enhanced blocking activity over its eastern/western part. Atlantic blocking occurrence increases for both (high/low) solar phases, with a spatial dependent response confined to western/eastern Atlantic. Although solar effects are negligible in blocking frequency for the entire Atlantic sector, other blocking features exhibit significant responses. Low solar Atlantic blocking episodes last longer, are located further east and become more intense than high solar blocking events. The implications of these solar-related changes are discussed. Our results suggest that the excessively cold conditions recorded in Europe during the Maunder Minimum may have arisen from an eastward shift of long-lasting blockings with near-normal frequencies.


Item Type:Article
Additional Information:

© 2008 by the American Geophysical Union. The authors would like to thank to Juerg Luterbacher, who provided useful comments and suggestions. D. B. and R. G. H. were supported by the Spanish Science and Technology Department through the VALIMOD (Climatic Validation of Conceptual Models) project (REN2002-04558-C04-01). R. H. was supported by the Grant Agency of the Czech Academy of Sciences, projects A3042401 and A300420805. Three anonymous reviewers provided helpful comments, which improved the original manuscript.

Uncontrolled Keywords:Quasi-Biennial Oscillation, Atmospheric Blocking, Maunder Minimum, Atlantic Oscillation, Geomagnetic-Activity, Spatial Structure, Cycle Modulation, Climate, Nao, Qbo
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
Sciences > Physics > Atmospheric physics
ID Code:24518
Deposited On:14 Mar 2014 10:29
Last Modified:10 Dec 2018 15:05

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