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Climate Dynamics

, Volume 46, Issue 5–6, pp 1371–1385 | Cite as

Validation of δ18O as a proxy for past monsoon rain by multi-GCM simulations

  • M. Midhun
  • R. Ramesh
Article

Abstract

Stable oxygen isotope ratios (δ18O) of tree cellulose and speleothem carbonate are useful proxies for past monsoon rain in many tropical regions, as a decrease in rain δ18O is observed with increase in rainfall on a monthly time scale. This amount effect varies spatially; therefore a local calibration, with actual measurements of rain amount and its δ18O is required. Such observations, however, are quite limited in space and time. To circumvent this difficulty, many isotope enabled general circulation models (GCMs) are used to aid the interpretation of 18O proxies; nevertheless, all such simulations taken together are yet to be evaluated against observations over the Indian summer monsoon (ISM) region. Here we examine ten such GCM simulations archived by the stable water isotope INtercomparison Group, phase 2. The spatial patterns of simulated ISM rainfall and its δ18O are in good agreement with the limited observations available. Simulations nudged with observed wind fields show better skill in reproducing the observed spatio-temporal pattern of rainfall and its δ18O. A large discrepancy is observed in the magnitude of the simulated amount effect over the Indian subcontinent between the models and observation, probably because models simulate the spatial distribution of monsoon precipitation differently. Nudged simulations show that interannual variability of rainfall δ18O at proxy sites are controlled by either regional (rather than local) rainfall or upstream rain out. Interannual variability of rainfall δ18O over the East Asian region is well correlated with ENSO, while it is only weakly correlated over the Indian sub-continent.

Keywords

Indian summer monsoon Stable isotopes Speleothem Amount effect Isotope enabled GCMs Model intercomparison Paleoclimatology 

Notes

Acknowledgments

We acknowledge the contributors to SWING2 project. We thank two anonymous reviewers, whose comments considerably improved the manuscript. We thank ISRO-GBP for funding.

Supplementary material

382_2015_2652_MOESM1_ESM.docx (438 kb)
Supplementary material 1 (DOCX 437 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Geosciences DivisionPhysical Research LaboratoryAhmedabadIndia
  2. 2.Indian Institute of Technology GandhinagarAhmedabadIndia
  3. 3.Sardar Patel UniversityVallabh VidyanagarIndia

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