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Lacustrine Records of Holocene ENSO Variability

Lacustrine Records of Holocene ENSO Variability. Christopher Moy 1 Donald Rodbell 2 Geoffrey Seltzer 3 Ursula Roehl 4 David Anderson 1. 1 NOAA Paleoclimatology Program 2 Geology Dept., Union College 3 Dept. Of Earth Sciences, Syracuse University 4 University of Bremen. Background.

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Lacustrine Records of Holocene ENSO Variability

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  1. Lacustrine Records of Holocene ENSO Variability Christopher Moy1 Donald Rodbell2 Geoffrey Seltzer3 Ursula Roehl4 David Anderson1 1NOAA Paleoclimatology Program 2Geology Dept., Union College 3Dept. Of Earth Sciences, Syracuse University 4University of Bremen

  2. Background • Sediment core retrieved from L. Pallcacocha displayed abundant light-colored clastic laminae. • Rodbell et al. (1999) hypothesized that the clastic laminae were deposited during El Nino-induced alluviation events in the drainage basin. • However, discontinuity and lack of a sediment-water interface precluded investigation of millennial-scale variability.

  3. Objective: • Utilize a new continuous sediment core and identify the frequency components with wavelet analysis

  4. Geotek Linescan Camera

  5. CORTEX XRF Scanner – Univ. of Bremen Jansen et al. (1998) Jansen et al. (1998)

  6. Age Models Constant Carbon Accumulation Model: -Distributes age based on carbon content of sediment Event Model: -All laminae assigned a value of 6 months based on Rio Chira discharge data Both models assign higher sedimentation rates to the light-colored laminae

  7. Relationship to Modern ENSO

  8. Linescan Results

  9. XRF Results

  10. ENSO Model Comparison Clement et al. (2000)

  11. Image from Cole (2001)

  12. Future Work - Laguna Fondococha K (cps) Ti (cps) Fe (cps)

  13. Conclusions: • Gradual increase in ENSO event frequency through the Holocene • Driven by orbitally-induced changes in insolation • Millennial-scale variability centered on 2,000 yrs • Centennial to ENSO band variance exhibited in the most recent 6,000 yrs of the record

  14. XRF Results

  15. Pallcacocha Filtered XRF Composite Comparison to IRD events in the N. Atlantic

  16. Comparison to IRD events in the N. Atlantic

  17. Pacific Basin Proxy Records

  18. ENSO Band

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