Stable carbon and oxygen isotope ratios of Cibicidoides wuellerstorfi in the 340 to 0 kyr section of ODP Site 162-980 in the subpolar North Atlantic
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| Main Authors: | , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
1999
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| _version_ | 1867169005046857728 |
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| author | McManus, Jerry F Oppo, Delia W Cullen, James L |
| author_facet | McManus, Jerry F Oppo, Delia W Cullen, James L |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Long, continuous, marine sediment records from the subpolar North Atlantic document the glacial modulation of regional climate instability throughout the past 0.5 million years. Whenever ice sheet size surpasses a critical threshold indicated by the benthic oxygen isotope (delta18O) value of 3.5 per mil during each of the past five glaciation cycles, indicators of iceberg discharge and sea-surface temperature display dramatically larger amplitudes of millennial-scale variability than when ice sheets are small. Sea-surface temperature oscillations of 1° to 2°C increase in size to approximately 4° to 6°C, and catastrophic iceberg discharges begin alternating repeatedly with brief quiescent intervals. The glacial growth associated with this amplification threshold represents a relatively small departure from the modern ice sheet configuration and sea level. Instability characterizes nearly all observed climate states, with the exception of a limited range of baseline conditions that includes the current Holocene interglacial. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_700818 |
| institution | PANGAEA |
| language | en |
| publishDate | 1999 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Stable carbon and oxygen isotope ratios of Cibicidoides wuellerstorfi in the 340 to 0 kyr section of ODP Site 162-980 in the subpolar North Atlantic McManus, Jerry F Oppo, Delia W Cullen, James L 162-980; AGE; Cibicidoides wuellerstorfi, δ13C; Cibicidoides wuellerstorfi, δ18O; COMPCORE; Composite Core; DEPTH, sediment/rock; Joides Resolution; Leg162; Mass spectrometer, Finnigan, MAT 252; North Atlantic Ocean; Ocean Drilling Program; ODP Long, continuous, marine sediment records from the subpolar North Atlantic document the glacial modulation of regional climate instability throughout the past 0.5 million years. Whenever ice sheet size surpasses a critical threshold indicated by the benthic oxygen isotope (delta18O) value of 3.5 per mil during each of the past five glaciation cycles, indicators of iceberg discharge and sea-surface temperature display dramatically larger amplitudes of millennial-scale variability than when ice sheets are small. Sea-surface temperature oscillations of 1° to 2°C increase in size to approximately 4° to 6°C, and catastrophic iceberg discharges begin alternating repeatedly with brief quiescent intervals. The glacial growth associated with this amplification threshold represents a relatively small departure from the modern ice sheet configuration and sea level. Instability characterizes nearly all observed climate states, with the exception of a limited range of baseline conditions that includes the current Holocene interglacial. |
| title | Stable carbon and oxygen isotope ratios of Cibicidoides wuellerstorfi in the 340 to 0 kyr section of ODP Site 162-980 in the subpolar North Atlantic |
| topic | 162-980; AGE; Cibicidoides wuellerstorfi, δ13C; Cibicidoides wuellerstorfi, δ18O; COMPCORE; Composite Core; DEPTH, sediment/rock; Joides Resolution; Leg162; Mass spectrometer, Finnigan, MAT 252; North Atlantic Ocean; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.700818 |