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Title

Reconciling North Atlantic climate modes: revised monthly indices for the East Atlantic and the Scandinavian patterns beyond the 20th century

AuthorsComas-Bru, Laia; Hernández, Armand
KeywordsOscillation
Precipitation
Temperature
Variability
Dataset
Trends
Issue DateDec-2018
PublisherCopernicus Publications
CitationEarth System Science Data,10(4): 2329-2344 (2018)
AbstractClimate variability in the North Atlantic sector is commonly ascribed to the North Atlantic Oscillation. However, recent studies have shown that taking into account the second and third mode of variability (namely the East Atlantic – EA – and the Scandinavian – SCA – patterns) greatly improves our understanding of their controlling mechanisms, as well as their impact on climate. The most commonly used EA and SCA indices span the period from 1950 to present, which is too short, for example, to calibrate palaeoclimate records or assess their variability over multi-decadal scales. To tackle this, here, we create new EOF-based (empirical orthogonal function) monthly EA and SCA indices covering the period from 1851 to present, and compare them with their equivalent instrumental indices. We also review and discuss the value of these new records and provide insights into the reasons why different sources of data may give slightly different time series. Furthermore, we demonstrate that using these patterns to explain climate variability beyond the winter season needs to be done carefully due to their non-stationary behaviour. The datasets are available at https://doi.org/10.1594/PANGAEA.892769.
Publisher version (URL)https://doi.org/10.5194/essd-10-2329-2018
URIhttp://hdl.handle.net/10261/173886
DOI10.5194/essd-10-2329-2018
ISSN1866-3508
E-ISSN1866-3516
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