Different definitions of the North Atlantic oscillation index: A comparison of their effects on surface climate elements in Europe
The aim of this work is to compare various definitions of the North Atlantic Oscillation (NAO) index that have frequently been employed in recent studies. The period used for the comparison is 1958-1998 and only winter and summer seasons are analyzed. We examine seven definitions of the monthly NAO...
| Main Authors: | , |
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| Format: | Other/Unknown Material |
| Language: | English |
| Published: |
2010
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| Subjects: | |
| Online Access: | http://hdl.handle.net/11104/0246383 |
| Summary: | The aim of this work is to compare various definitions of the North Atlantic Oscillation (NAO) index that have frequently been employed in recent studies. The period used for the comparison is 1958-1998 and only winter and summer seasons are analyzed. We examine seven definitions of the monthly NAO indices and scores (scores were derived from rotated solutions of principal component analysis). The correlations of indices with four climatic elements over Europe are used for comparison: mean monthly maximum and minimum surface temperature, the number of days with precipitation ≥0.1 mm, and monthly precipitation amounts. The climate elements are defined at 82 stations across whole Europe and are taken from the ECA&D database. |
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