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 ...
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...
| Main Authors: | , , |
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| Format: | Dataset |
| Language: | English |
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PANGAEA
1999
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.700818 https://doi.pangaea.de/10.1594/PANGAEA.700818 |
| Summary: | 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 ... : Depth is composite depth (mcd). For the 500 to 340 kyr section see Oppo et al., (1998) data set: doi:10.1594/PANGAEA.698998 ... |
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