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| Khider, D.; Stott, L. D.; Emile-geay, J.; Thunell, R.; Hammond, D. E.. |
| We present a reconstruction of El Nino Southern Oscillation (ENSO) variability spanning the Medieval Climate Anomaly (MCA, A. D. 800-1300) and the Little Ice Age (LIA, A. D. 1500-1850). Changes in ENSO are estimated by comparing the spread and symmetry of delta O-18 values of individual specimens of the thermocline-dwelling planktonic foraminifer Pulleniatina obliquiloculata extracted from discrete time horizons of a sediment core collected in the Sulawesi Sea, at the edge of the western tropical Pacific warm pool. The spread of individual delta O-18 values is interpreted to be a measure of the strength of both phases of ENSO while the symmetry of the delta O-18 distributions is used to evaluate the relative strength/ frequency of El Ni o and La Ni a... |
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| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00227/33814/32488.pdf |
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| Khider, D.; Jackson, C. S.; Stott, L. D.. |
| We investigate the relationship between tropical Pacific and Southern Ocean variability during the Holocene using the stable oxygen isotope and magnesium/calcium records of cooccurring planktonic and benthic foraminifera from a marine sediment core collected in the western equatorial Pacific. The planktonic record exhibits millennial-scale sea surface temperature (SST) oscillations over the Holocene of ~0.5°C while the benthic δ18Oc document ~0.10‰ millennial-scale changes of Upper Circumpolar Deep Water (UCDW), a water mass which outcrops in the Southern Ocean. Solar forcing as an explanation for millennial-scale SST variability requires (1) a large climate sensitivity and (2) a long 400 year delayed response, suggesting that if solar forcing is the cause... |
| Tipo: Text |
Palavras-chave: Holocene; Millennial-scale variability; Mg; Ca thermometry; Uncertainty Quantification; Solar Forcing. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00290/40166/39058.pdf |
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