Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2012
|
| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.786205 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1867171363687497728 |
|---|---|
| author | Elderfield, Henry Ferretti, Patrizia Greaves, Mervyn Crowhurst, Simon J McCave, I Nicholas Hodell, David A Piotrowski, Alexander M |
| author_facet | Elderfield, Henry Ferretti, Patrizia Greaves, Mervyn Crowhurst, Simon J McCave, I Nicholas Hodell, David A Piotrowski, Alexander M |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Earth's climate underwent a fundamental change between 1250 and 700 thousand years ago, the Mid-Pleistocene Transition (MPT), when the dominant periodicity of climate cycles changed from 41,000 to 100,000 years in the absence of significant change in orbital forcing. Over this time, an increase occurred in the amplitude of change of deep ocean foraminiferal oxygen isotopic ratios, traditionally interpreted as defining the main rhythm of ice ages although containing large effects of changes in deep-ocean temperature. We have separated the effects of decreasing temperature and increasing global ice volume on oxygen isotope ratios. Our results suggest that the MPT was initiated by an abrupt increase in Antarctic ice volume at 900 ka. We see no evidence of a pattern of gradual cooling but near-freezing temperatures occur at every glacial maximum. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_786205 |
| institution | PANGAEA |
| language | en |
| publishDate | 2012 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Stable oxygen isotope record and Mg/Ca ratios at the Mid-Pleistocene Climate Transition, ODP Site 181-1123 Elderfield, Henry Ferretti, Patrizia Greaves, Mervyn Crowhurst, Simon J McCave, I Nicholas Hodell, David A Piotrowski, Alexander M Ocean Drilling Program; ODP Earth's climate underwent a fundamental change between 1250 and 700 thousand years ago, the Mid-Pleistocene Transition (MPT), when the dominant periodicity of climate cycles changed from 41,000 to 100,000 years in the absence of significant change in orbital forcing. Over this time, an increase occurred in the amplitude of change of deep ocean foraminiferal oxygen isotopic ratios, traditionally interpreted as defining the main rhythm of ice ages although containing large effects of changes in deep-ocean temperature. We have separated the effects of decreasing temperature and increasing global ice volume on oxygen isotope ratios. Our results suggest that the MPT was initiated by an abrupt increase in Antarctic ice volume at 900 ka. We see no evidence of a pattern of gradual cooling but near-freezing temperatures occur at every glacial maximum. |
| title | Stable oxygen isotope record and Mg/Ca ratios at the Mid-Pleistocene Climate Transition, ODP Site 181-1123 |
| topic | Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.786205 |