The contribution of R. Allan was written in the course of his employment at the Met Office, UK and is published with the permission of the Controller of HMSO and the Queen's Printer for Scotland.
Reconstructing ENSO: the influence of method, proxy data, climate forcing and teleconnections†
Article first published online: 4 SEP 2009
Copyright © 2009 John Wiley & Sons, Ltd. and © Crown Copyright 2009.
Journal of Quaternary Science
Special Issue: The 4th IPCC Report and Beyond: Palaeoclimate Perspectives
Volume 25, Issue 1, pages 62–78, January 2010
How to Cite
Wilson, R., Cook, E., D'Arrigo, R., Riedwyl, N., Evans, M. N., Tudhope, A. and Allan, R. (2010), Reconstructing ENSO: the influence of method, proxy data, climate forcing and teleconnections. J. Quaternary Sci., 25: 62–78. doi: 10.1002/jqs.1297
Wilson, R., Cook, E., D'Arrigo, R., Riedwyl, N., Evans, M. N., Tudhope, A. and Allan, R. 2010. Reconstructing ENSO: the influence of method, proxy data, climate forcing and teleconnections. J. Quaternary Sci., Vol. 25 pp. 62–78. ISSN 0267–8179.
- Issue published online: 4 DEC 2009
- Article first published online: 4 SEP 2009
- Manuscript Accepted: 22 APR 2009
- Manuscript Revised: 18 APR 2009
- Manuscript Received: 29 JUL 2008
- tree rings;
In this study we compare three newly developed independent NINO3.4 sea surface temperature (SST) reconstructions using data from (1) the central Pacific (corals), (2) the TexMex region of the USA (tree rings) and (3) other regions in the Tropics (corals and an ice core) which are teleconnected with central Pacific SSTs in the 20th century. Although these three reconstructions are strongly calibrated and well verified, inter-proxy comparison shows a significant weakening in inter-proxy coherence in the 19th century. This breakdown in common signal could be related to insufficient data, dating errors in some of the proxy records or a breakdown in El Niño–Southern Oscillation's (ENSO's) influence on other regions. However, spectral analysis indicates that each reconstruction portrays ENSO-like spectral properties. Superposed epoch analysis also shows that each reconstruction shows a generally consistent ‘El Niño-like’ response to major volcanic events in the following year, while during years T + 4 to T + 7 ‘La Niña-like’ conditions prevail. These results suggest that each of the series expresses ENSO-like ‘behaviour’, but this ‘behaviour’ does not appear to be spatially or temporally consistent. This result may reflect published observations that there appear to be distinct ‘types’ of ENSO variability depending on location within the tropical Pacific. Future work must address potential dating issues within some proxies (i.e. sampling of multiple coral heads for one location) as well as assessing the time stability of local climate relationships with central Pacific SSTs. More emphasis is needed on sampling new and extending old coral proxy records from the crucial central and eastern tropical Pacific region. Copyright © 2009 John Wiley & Sons, Ltd. and © Crown Copyright 2009.