δ18O in the Tropical Conifer Agathis robusta Records ENSO-Related Precipitation Variations

摘要: Long-lived trees from tropical Australasia are a potential source of information about internal variability the El Nino-Southern Oscillation (ENSO), because they occur in region where precipitation is closely associated with ENSO activity. We measured tree-ring width and oxygen isotopic composition (O) -cellulose Agathis robusta (Queensland Kauri) samples collected Atherton Tablelands, Queensland, Australia. Standard ring-width chronologies yielded low consistency due to frequent presence false ring-like anatomical features. However, detailed examination most recent 15 years growth (1995–2010), we found significant correlation between O local precipitation, latter The results consistent process-based forward modeling -cellulose. record also enabled us confirm ring one three composite record, determine that it occurred as consequence anomalously rainfall middle 2004/5 rainy season. combination incremental measures may be powerful approach development long-term (150+ year) reconstructions terrestrial tropics Australasia.