C R a 9 e o e m e d
Burckle et al., 1996), the evidence for higher sea surface tempera-ures in the North Atlantic is fairly robust. High-latitude warmth can be explained by several mechanisms, ncluding higher atmospheric CO2 levels and/or more vigorous ther-ohaline circulation relative to today (e.g., Crowley, 1991). H...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.555.2166 http://www.es.ucsc.edu/~jzachos/pubs/Billups_etal_97.pdf |
| Summary: | Burckle et al., 1996), the evidence for higher sea surface tempera-ures in the North Atlantic is fairly robust. High-latitude warmth can be explained by several mechanisms, ncluding higher atmospheric CO2 levels and/or more vigorous ther-ohaline circulation relative to today (e.g., Crowley, 1991). Howev-r, these two mechanisms appear to be somewhat mutually exclusive. tmospheric climate models, for example, suggest that high pCO2 eakens thermohaline circulation by concentrating precipitation ver the North Atlantic (e.g., Washington and Meehl, 1989). Ocean irculation models suggest that an open Panamanian Seaway (until-4 Ma) weakens thermohaline circulation by allowing low salinity acific water into the North Atlantic (e.g., Maier-Raimer et al., 990). The geologic record, on the other hand, shows evidence of a igorous conveyor belt in the early Pliocene that weakened as a re-ponse to the onset of northern hemisphere glaciation (e.g., Hodell nd Ciesielski, 1990; Raymo et al., 1992; Raymo et al., 1996). In this |
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