Northern Queensland 15 Year Kauri Tree-Ring Oxygen Isotope Data Boysen, B.M.M.; Evans, M.N.; Baker, P.J. Boysen, B.M.M. Evans, M.N. Baker, P.J. ENSO AGRO Agathis robusta (C. Moore ex F. Muell) Bailey kauri pine earth science/paleoclimate/tree ring (delta 18O,alpha cellulose,null,per mil VSMOW,null,tree ring,null,isotope ratio mass spectrometry,N,sample is approximately Nov-March) earth science/paleoclimate/paleoclimatic modeling (delta 18O,alpha cellulose,null,per mil VSMOW,Nov-Mar,paleoclimatic modeling,null,forward model,N,process-based forward modeling; median of 1000 simulations for each year) earth science/paleoclimate/tree ring (age,null,null,year Common Era,null,tree ring,null,null,N,null) earth science/paleoclimate/tree-ring (Dinden National Park>LATITUDE -16.9794>LONGITUDE 145.6032) Long-lived trees from tropical Australasia are a potential source of information about internal variability of the El Nino-Southern Oscillation (ENSO), because they occur in a region where precipitation variability is closely associated with ENSO activity. We measured tree-ring width and oxygen isotopic composition (d18O) of alpha-cellulose from Agathis robusta (Queensland Kauri) samples collected in the Atherton Tablelands, Queensland, Australia. Standard ring-width chronologies yielded low internal consistency due to the frequent presence of false ring-like anatomical features. However, in a detailed examination of the most recent 15 years of growth (1995-2010), we found significant correlation between d18O and local precipitation, the latter associated with ENSO activity. The results are consistent with process-based forward modeling of the oxygen isotopic composition of alpha-cellulose. The d18O record also enabled us to confirm the presence of a false growth ring in one of the three samples in the composite record, and to determine that it occurred as a consequence of anomalously low rainfall in the middle of the 2004/5 rainy season. The combination of incremental growth and isotopic measures may be a powerful approach to development of long-term (150+ year) ENSO reconstructions from the terrestrial tropics of Australasia. STUDY NOTES: Tree-ring oxygen isotope data from Agathis robusta (Queensland Kauri) samples collected in Dinden National Park, Queensland, Australia, for 1995-2010 AD. Data are measured for the southern hemisphere November-April growing season. Also included are datafile BEB14.dat and a matlab script to plot the data as in Fig 2(a) of Boysen et al. 2014. In the datafile BEB14.dat, data are identifed by the year growth began, i.e. 1995 data correspond to the growing season Nov 1995 - Apr 1996. IITRDB14 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Boysen, B.M.M. Investigator : Evans, M.N. Investigator : Baker, P.J. 2014-10-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/17267 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/australia/data2fig2a.m https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/australia/BEB14.dat https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/australia/queensland2014tr-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/australia/data2fig2a.m https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/australia/BEB14.dat https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/australia/queensland2014tr-iso.txt English https://www.ncdc.noaa.gov/paleo/study/17267 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/australia/data2fig2a.m https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/australia/BEB14.dat https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/australia/queensland2014tr-iso.txt Bjorn M. M. Boysen, Michael N. Evans, Patrick J. Baker 2014d18O in the Tropical Conifer Agathis robusta Records ENSO-Related Precipitation VariationsPLoS ONE9710.1371/journal.pone.0102336http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0102336 START YEAR: 1995 AD * END YEAR: 2010 AD 145.6032 -16.9794 145.6032 -16.9794