Stable oxygen isotope record of planktonic foraminifera from late Quaternary sediments of the equatorial Pacific
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| Main Authors: | , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
1992
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| _version_ | 1867170456301207552 |
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| author | Le, Jianning Shackleton, Nicholas J |
| author_facet | Le, Jianning Shackleton, Nicholas J |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Planktonic foraminiferal test fragmentation in three cores along a depth transect from the western equatorial Pacific (ERDC-93P, 1619 m; RC17-177, 2600 m; V28-238, 3120 m [Thompson, 1976]) were examined for the last 500 kyr at sample intervals from 2.5 to 5 kyr to study the fluctuations of dissolution in the western equatorial Pacific. The age models were constructed by correlating the delta18O records with the SPECMAP stack [Imbrie et al., 1984]. Results showed that intermediate and deep waters experienced the same patterns of dissolution through climatic cycles. Fragmentation varied with a greater amplitude, and the carbonate ion concentration changed less, in the deep than in the intermediate water. Dissolution has significant variance distributions and coherencies with delta18O over the 100, 41, and 23 kyr periods of orbital variations; dissolution maxima lag ice volume minima by 6 to 20 kyr. The dissolution variability was consistent with recent geochemical models which seek to explain the reduction of atmospheric CO2 concentration at the last glacial maximum [Broecker, 1982; Boyle, 1988]. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_727740 |
| institution | PANGAEA |
| language | en |
| publishDate | 1992 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Stable oxygen isotope record of planktonic foraminifera from late Quaternary sediments of the equatorial Pacific Le, Jianning Shackleton, Nicholas J ERDC; ERDC-093P; PC; Piston corer; RC17; RC17-177; Robert Conrad; Thomas Washington; V24; V24-109; Vema Planktonic foraminiferal test fragmentation in three cores along a depth transect from the western equatorial Pacific (ERDC-93P, 1619 m; RC17-177, 2600 m; V28-238, 3120 m [Thompson, 1976]) were examined for the last 500 kyr at sample intervals from 2.5 to 5 kyr to study the fluctuations of dissolution in the western equatorial Pacific. The age models were constructed by correlating the delta18O records with the SPECMAP stack [Imbrie et al., 1984]. Results showed that intermediate and deep waters experienced the same patterns of dissolution through climatic cycles. Fragmentation varied with a greater amplitude, and the carbonate ion concentration changed less, in the deep than in the intermediate water. Dissolution has significant variance distributions and coherencies with delta18O over the 100, 41, and 23 kyr periods of orbital variations; dissolution maxima lag ice volume minima by 6 to 20 kyr. The dissolution variability was consistent with recent geochemical models which seek to explain the reduction of atmospheric CO2 concentration at the last glacial maximum [Broecker, 1982; Boyle, 1988]. |
| title | Stable oxygen isotope record of planktonic foraminifera from late Quaternary sediments of the equatorial Pacific |
| topic | ERDC; ERDC-093P; PC; Piston corer; RC17; RC17-177; Robert Conrad; Thomas Washington; V24; V24-109; Vema |
| url | https://doi.org/10.1594/PANGAEA.727740 |