Regional Climate Impacts of the Northern Hemisphere Annular Mode
Top Cited Papers
- 6 July 2001
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 293 (5527), 85-89
- https://doi.org/10.1126/science.1058958
Abstract
The Northern Hemisphere annular mode (NAM) (also known as the North Atlantic Oscillation) is shown to exert a strong influence on wintertime climate, not only over the Euro-Atlantic half of the hemisphere as documented in previous studies, but over the Pacific half as well. It affects not only the mean conditions, but also the day-to-day variability, modulating the intensity of mid-latitude storms and the frequency of occurrence of high-latitude blocking and cold air outbreaks throughout the hemisphere. The recent trend in the NAM toward its high-index polarity with stronger subpolar westerlies has tended to reduce the severity of winter weather over most middle- and high-latitude Northern Hemisphere continental regions.Keywords
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