The mid-Pleistocene transition in the tropical Pacific |
| |
Authors: | Medina-Elizalde Martín Lea David W |
| |
Institution: | Department of Earth Science, University of California Santa Barbara, Santa Barbara, CA 93106-9630, USA. |
| |
Abstract: | A sea surface temperature (SST) record based on planktonic foraminiferal magnesium/calcium ratios from a site in the western equatorial Pacific warm pool reveals that glacial-interglacial oscillations in SST shifted from a period of 41,000 to 100,000 years at the mid-Pleistocene transition, 950,000 years before the present. SST changes at both periodicities were synchronous with eastern Pacific cold-tongue SSTs but preceded changes in continental ice volume. The timing and nature of tropical Pacific SST changes over the mid-Pleistocene transition implicate a shift in the periodicity of radiative forcing by atmospheric carbon dioxide as the cause of the switch in climate periodicities at this time. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|