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Research Article
Change in the dominant decadal patterns and the late 1980s abrupt warming in the extratropical Northern Hemisphere
Article first published online: 13 JUL 2010
DOI: 10.1002/asl.275
Copyright © 2010 Royal Meteorological Society
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Additional Information
How to Cite
Lo, T.-T. and Hsu, H.-H. (2010), Change in the dominant decadal patterns and the late 1980s abrupt warming in the extratropical Northern Hemisphere. Atmosph. Sci. Lett., 11: 210–215. doi: 10.1002/asl.275
Publication History
- Issue published online: 13 JUL 2010
- Article first published online: 13 JUL 2010
- Manuscript Accepted: 15 MAR 2010
- Manuscript Revised: 8 MAR 2010
- Manuscript Received: 14 AUG 2009
Keywords:
- late 1980's abrupt warming;
- decadal fluctuation;
- IPCC AR4;
- natural variability versus anthropogenic greenhouse effect
Abstract
Widespread abrupt warming in the extratropical Northern Hemisphere (NH) occurred in the late 1980s. This warming was associated with a change in the relative influence of the Pacific Decadal Oscillation (PDO)-like pattern and the Arctic Oscillation (AO)-like pattern. The AO-like pattern has had a dominant influence on the NH-mean temperature since the late 1980s, whereas the influence of the PDO has weakened. The AO-like mode appears as part of natural variability in the pre-industrial simulations of the CMIP3/IPCC climate models. However, its emergence in the late 1980s was not simulated by most models with or without the observed increasing greenhouse effect in the 20th century. Copyright © 2010 Royal Meteorological Society