Russon, T., Tudhope, A. W., Hegerl, G. C., Collins, M., and Tindall, J.: Inter-annual tropical Pacific climate variability in an isotope-enabled CGCM: implications for interpreting coral stable oxygen isotope records of ENSO, Clim. Past, 9, 1543-1557, doi:10.5194/cp-9-1543-2013, 2013.
Source: environment.data.gov.uk (2018-06-19)

QPENSO: HadCM3 model simulations output collection. Model simulations undertaken by the Quantifying variability of the El Nino Southern Oscillation on adaptation-relevant time scales using a novel palaeodata-modelling approach (QPENSO) project. These are coupled ocean-atmosphere experiments with a modified version of the HadCM3 (UM version 4.5) climate model. The model has been modified to include stable isotopes of oxygen in both the ocean and atmosphere sub-models, after Tindall et al., 2009. The simulations are grouped into two experiments: 1) 'picontrol', comprising a single 750 year duration unforced pre-industrial boundary condition simulation; 2) 'forced', comprising a suite of six historical simulations of the interval 1160-1360 AD and including changes in solar, volcanic and greenhouse gas forcing. The six simulations represent an initial-condition ensemble over this interval.
This project was funded by NERC under grant NE/H009957/1.

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Articles (https://cp.copernicus.org/) | Volume 9, issue 4 (https://cp.copernicus.org/articles/9/issue4.html)
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https://doi.org/10.5194/cp-9-1543-2013

© Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/cp-9-1543-2013

© Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License.

Articles (https://cp.copernicus.org/) | Volume 9, issue 4 (https://cp.copernicus.org/articles/9/issue4.html)
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22 Jul 2013

Research article | (https://creativecommons.org/licenses/by/3.0/) | 22 Jul 2013

Inter-annual tropical Pacific climate variability in an isotope-enabled CGCM: implications for interpreting coral stable oxygen isotope records of ENSO

T. Russon, A. W. Tudhope, G. C. Hegerl, M. Collins, and J. Tindall

T. Russon

School of GeoSciences, University of Edinburgh, UK

A. W. Tudhope

School of GeoSciences, University of Edinburgh, UK

G. C. Hegerl

School of GeoSciences, University of Edinburgh, UK

M. Collins

College of Engineering, Mathematics and Physical Sciences, University of Exeter, EX4 4QF, UK

J. Tindall

School of Earth and Environment, University of Leeds, UK

Abstract. Water isotope-enabled coupled atmosphere–ocean climate models allow for exploration of the relative contributions to coral stable oxygen isotope (δ18Ocoral) variability arising from sea surface temperature (SST) and the isotopic composition of seawater (δ18Osw). The unforced behaviour of the isotope-enabled HadCM3 coupled general circulation model suggests that the extent to which inter-annual δ18Osw variability contributes to that in model δ18Ocoral is strongly spatially dependent, ranging from being negligible in the eastern equatorial Pacific to accounting for 50% of δ18Ocoral variance in parts of the western Pacific. In these latter cases, a significant component of the inter-annual δ18Osw variability is correlated to that in SST, meaning that local calibrations of the effective local δ18Ocoral–SST relationships are likely to be essential. Furthermore, the relationship between δ18Osw and SST can be non-linear, such that the model interpretation of central and western equatorial Pacific δ18Ocoral in the context of a linear dependence on SST alone leads to overestimation (by up to 20%) of the SST anomalies associated with large El Niño events. Intra-model evaluation of a salinity-based pseudo-coral approach shows that such an approach captures the first-order features of the model δ18Osw behaviour. However, the utility of the pseudo-corals is limited by the extent of spatial variability seen within the modelled slopes of the temporal salinity–δ18Osw relationship.

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How to cite. Russon, T., Tudhope, A. W., Hegerl, G. C., Collins, M., and Tindall, J.: Inter-annual tropical Pacific climate variability in an isotope-enabled CGCM: implications for interpreting coral stable oxygen isotope records of ENSO, Clim. Past, 9, 1543–1557, https://doi.org/10.5194/cp-9-1543-2013, 2013.

Received: 18 Jan 2013 – Discussion started: 07 Feb 2013 – Revised: 19 Jun 2013 – Accepted: 20 Jun 2013 – Published: 22 Jul 2013

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