Stable isotope record of sediment core MD98-2177
Cobertura |
LATITUDE: 1.400000 * LONGITUDE: 119.080000 |
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Data(s) |
13/03/2011
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Resumo |
We present a reconstruction of El Niño 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 d18O 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 d18O values is interpreted to be a measure of the strength of both phases of ENSO while the symmetry of the d18O distributions is used to evaluate the relative strength/frequency of El Niño and La Niña events. In contrast to previous studies, we use robust and resistant statistics to quantify the spread and symmetry of the d18O distributions; an approach motivated by the relatively small sample size and the presence of outliers. Furthermore, we use a pseudo-proxy approach to investigate the effects of the different paleo-environmental factors on the statistics of the d18O distributions, which could bias the paleo-ENSO reconstruction. We find no systematic difference in the magnitude/strength of ENSO during the Northern Hemisphere MCA or LIA. However, our results suggest that ENSO during the MCA was skewed toward stronger/more frequent La Niña than El Niño, an observation consistent with the medieval megadroughts documented from sites in western North America. |
Formato |
application/zip, 3 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.830589 doi:10.1594/PANGAEA.830589 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Khider, D; Stott, Lowell D; Emile-Geay, J; Thunell, Robert C; Hammond, Douglas E (2011): Assessing El Niño Southern Oscillation variability during the past millennium. Paleoceanography, 26(3), PA3222, doi:10.1029/2011PA002139 |
Palavras-Chave | #1 sigma; 210Pb; 210Pb std dev; 210Pb xs; 210Pb xs std dev; 214Pb; 214Pb std dev; a AD; Age; AGE; Age, 14C AMS; Age, 14C calibrated; Age, comment; Age, dated; Age, dated standard deviation; Age, error; Age dated; Age e; Age std dev; CALYPSO; Calypso Corer; Comm; Depth; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Depth bot; Depth top; IMAGES IV-IPHIS III; Lab; Lab label; Laboratory; Laboratory code/label; Layer thickness; Lead 210; Lead 210, standard deviation; Lead 210 excess; Lead 210 excess, standard deviation; Lead 214; Lead 214, standard deviation; Marion Dufresne; Mass; maximum; MD111; MD982177; MD98-2177; minimum; P. obliqu. d13C; P. obliqu. d18O; per individual; Pulleniatina obliquiloculata, d13C; Pulleniatina obliquiloculata, d18O; Thickness |
Tipo |
Dataset |