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Discussion papers
https://doi.org/10.5194/essd-2018-86
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2018-86
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Review article 04 Oct 2018

Review article | 04 Oct 2018

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Earth System Science Data (ESSD) and is expected to appear here in due course.

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

Laia Comas-Bru1 and Armand Hernández2 Laia Comas-Bru and Armand Hernández
  • 1UCD School of Earth Sciences, University College Dublin, Belfield, Dublin 4, Ireland
  • 2Institute of Earth Sciences Jaume Almera, ICTJA, CSIC, 08028 Barcelona, Spain

Abstract. Climate 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 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.pangaea.de/10.1594/PANGAEA.892769.

Laia Comas-Bru and Armand Hernández
Laia Comas-Bru and Armand Hernández
Laia Comas-Bru and Armand Hernández
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Short summary
This review presents new EOF-based monthly indices of the East Atlantic and the Scandinavian patterns covering the period from 1851 to present. The manuscript also includes a comparison with their analogous instrumental indices, provides insights into the reasons why different sources of data may give slightly different time-series, and demonstrates that using these patterns to explain climate variability beyond the winter season needs to be done carefully due to their non-stationary behaviour.
This review presents new EOF-based monthly indices of the East Atlantic and the Scandinavian...
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