ENSO flavors in a tree-ring δ18O record of Tectona grandis from Indonesia
- 1GFZ – German Research Centre for Geosciences, Section 5.2 Climate Dynamics and Landscape Evolution, Potsdam, Germany
- 2Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany
- 3Department of Atmospheric Sciences, University of Hawaii at Manoa, Honolulu, Hawaii, USA
- 4Navarino Environmental Obs. Messinia, Greece
- 5Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden
- 6Tree Ring Laboratory, Lamont-Doherty Earth Observatory, Columbia University, USA
Abstract. Indonesia's climate is dominated by the equatorial monsoon system, and has been linked to El Niño-Southern Oscillation (ENSO) events that often result in extensive droughts and floods over the Indonesian archipelago. In this study we investigate ENSO-related signals in a tree-ring δ18O record (1900–2007) of Javanese teak. Our results reveal a clear influence of Warm Pool (central Pacific) El Niño events on Javanese tree-ring δ18O, and no clear signal of Cold Tongue (eastern Pacific) El Niño events. These results are consistent with the distinct impacts of the two ENSO flavors on Javanese precipitation, and illustrate the importance of considering ENSO flavors when interpreting palaeoclimate proxy records in the tropics, as well as the potential of palaeoclimate proxy records from appropriately selected tropical regions for reconstructing past variability of. ENSO flavors.