Distinct modes of bidecadal and multidecadal variability in a climate reconstruction of the last centuries from a South Pacific coral
- 83 Downloads
The Rarotonga coral Sr/Ca time series (Linsley et al. in Science 290:1145–1148, 2000) provides a near-monthly resolved proxy record of South Pacific climate variability over the last ~300 years. Here we show that two distinct interdecadal, quasi-periodic time components with periods of ~80 and ~25 years can be identified in this time series by Singular Spectrum Analysis. Their associated spatial patterns in the global sea surface temperature (SST) field show notable differences. Whereas the multidecadal component is associated with a global SST pattern that was recently associated with solar forcing on multidecadal timescales, the bidecadal component is associated with a well known pattern of Pacific decadal to interdecadal SST variability.
KeywordsEmpirical Orthogonal Function Singular Spectrum Analysis Empirical Orthogonal Function Analysis Interdecadal Variability Interdecadal Pacific Oscillation
We thank B.K. Linsley for making the Rarotonga coral Sr/Ca data available through the World Data Center for Paleoclimatology and for providing a manuscript prior to publication, and two anonymous reviewers for constructive comments that significantly improved the manuscript. MD acknowledges support of the ‘Access to Research Infrastructures’ program of the European Commission through ‘Paleostudies’ at Bremen University and of the Alexander von Humboldt Foundation. Funded by Bundesministerium für Bildung und Forschung through DEKLIM and by Deutsche Forschungsgemeinschaft through DFG-Research Center for Ocean Margins at Bremen University, contribution No. RCOM0281 and AWI-4711.
- Cole JE, Overpeck JT, Cook ER (2002) Multiyear La Niña events and persistent drought in the contiguous United States. Geophys Res Lett 29. DOI 10.1029/2001GL013561Google Scholar
- Felis T, Pätzold J (2004) Climate reconstructions from annually banded corals. In: Shiyomi M, Kawahata H, Koizumi H, Tsuda A, Awaya Y (eds) Global environmental change in the ocean and on land. Terrapub, Tokyo, pp 205–227Google Scholar
- Folland CK, Renwick JA, Salinger MJ, Mullan AB (2002) Relative influences of the Interdecadal Pacific Oscillation and ENSO on the South Pacific Convergence Zone. Geophys Res Lett 29. DOI 10.1029/2001GL014201Google Scholar
- Gedalof Z, Mantua NJ, Peterson DL (2002) A multi-century perspective of variability in the Pacific Decadal Oscillation: new insights from tree rings and corals. Geophys Res Lett 29. DOI 10.1029/2002GL015824Google Scholar
- Preisendorfer RH (1988) Principal component analysis in meteorology and oceanography. Elsevier, AmsterdamGoogle Scholar
- Stephans CL, Quinn TM, Taylor FW, Corrège T (2004) Assessing the reproducibility of coral-based climate records. Geophys Res Lett 31:L18210. DOI 10.1029/2004GL020343Google Scholar
- von Storch H, Zwiers FW (1999) Statistical analysis in climate research. Cambridge University Press, CambridgeGoogle Scholar