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Joint 72nd Annual Southeastern/ 58th Annual Northeastern Section Meeting - 2023

Paper No. 20-23
Presentation Time: 1:30 PM-5:30 PM

ANNUALLY-RESOLVED ENSO-HYDROCLIMATE ACTIVITIES AS RECORDED IN STABLE OXYGEN ISOTOPE OF TECTONA GRANDIS L. F. FROM SOUTHEAST SULAWESI OVER THE PAST ~300 YEARS


HERHO, Sandy, Department of Geology, University of Maryland, 8000 Regents Dr, #237, College Park, MD 20742; Paleoclimate CoLaboratory, University of Maryland, Chemistry Building, 8051 Regents Dr. #1212, College Park, MD 20742, EVANS, Michael N., Department of Geology, University of Maryland, 8000 Regents Dr, #237, College Park, MD 20742; Paleoclimate CoLaboratory, University of Maryland, Chemistry Building, 8051 Regents Dr. #1212, College Park, MD 20742; Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9W, Palisades, NY 10964, WOLLNEY, Jenna C., Geology, University of Maryland, 8000 Regents Dr, #237, College Park, MD 20742; Paleoclimate CoLaboratory, University of Maryland, Chemistry Building, 8051 Regents Dr. #1212, College Park, MD 20742, CARTER, Austin C., Fischell Department of Bioengineering, University of Maryland, 3102 A. James Clark Hall, 8051 Regents Dr. #1212, College Park, MD 20742; Paleoclimate CoLaboratory, University of Maryland, Chemistry Building, 8051 Regents Dr. #1212, College Park, MD 20742, GBENRO, Mary A., Paleoclimate CoLaboratory, University of Maryland, Chemistry Building, 8051 Regents Dr. #1212, College Park, MD 20742 and D'ARRIGO, Rosanne, Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9W, Palisades, NY 10964

El Niño-Southern Oscillation (ENSO) is a quasi-periodic interannual oscillation of the ocean-atmosphere system in the tropical Pacific which greatly influences global climate variability. However, until recently the long-term response to external radiative forcings is still controversial. In this study, we observed oxygen isotopes from dendrochronologically dated teak (Tectona grandis L. f.) α-cellulose samples collected at Muna, Indonesia (5.3ºS, 123ºE, elev. 10m). In this study we managed to combine four crossdated increment core samples of tg01c (1712 - 1995), mun63 (1799 -2004), tg11a (1680 - 1848), and mun81 (1764 - 2004) into an annually composite time series with a span of the past ~300 years. In processing this time series composite, we performed low-pass filtering by applying the Singular Spectrum Analysis (SSA) algorithm with five embedding dimensions to obtain ENSO-hydroclimate information which is the interannual mode by removing the main embedding dimension. The annually-resolved composite time series of δ18O that we constructed has a higher resolution than other studies that have been conducted to reconstruct ENSO-hydroclimate activities in the western tropical Pacific region over this period. This annually-resolved composite time series of δ18O can be used to study the response of ENSO to volcanic and greenhouse gas forcings in the period before and after the industrial revolution.

Session No. 20--Booth# 37

T24. Undergraduate and Graduate Geoscience Student Showcase (Posters)
Friday, 17 March 2023: 1:30 PM-5:30 PM
Grand Ballroom A–D (Hyatt Regency Reston)
Geological Society of America Abstracts with Programs. Vol. 55, No. 2
doi: 10.1130/abs/2023SE-385637
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