Strontium and oxygen isotope data for DSDP Hole 44-390A and ODP Leg 171 holes
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2005
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| _version_ | 1867167661599752192 |
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| author | MacLeod, Kenneth G Huber, Brian T Isaza-Londoño, Carolina |
| author_facet | MacLeod, Kenneth G Huber, Brian T Isaza-Londoño, Carolina |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Differences in regional responses to climate fluctuations are well documented on short time scales (e.g., El Niño-Southern Oscillation), but with the exception of latitudinal temperature gradients, regional patterns are seldom considered in discussions of ancient greenhouse climates. Contrary to the expectation of global warming or global cooling implicit in most treatments of climate evolution over millions of years, this paper shows that the North Atlantic warmed by as much as 6°C (1.5% decrease in d18O values of planktic foraminifera) during the Maastrichtian global cooling interval. We suggest that warming was the result of the importation of heat from the South Atlantic. Decreasing North Atlantic d18O values are also associated with increasing gradients in planktic d13C values, suggesting increasing surface-water stratification and a correlated strengthening of the North Atlantic Polar Front. If correct, this conclusion predicts arctic cooling during the late Maastrichtian. Beyond implications for the Maastrichtian, these data demonstrate that climate does not behave as if there is a simple global thermostat, even on geologic time scales. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_722600 |
| institution | PANGAEA |
| language | en |
| publishDate | 2005 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Strontium and oxygen isotope data for DSDP Hole 44-390A and ODP Leg 171 holes MacLeod, Kenneth G Huber, Brian T Isaza-Londoño, Carolina 171-1049C; 171-1050C; 171-1052E; 44-390A; Blake Nose, North Atlantic Ocean; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Joides Resolution; Leg171B; Leg44; North Atlantic Ocean; Ocean Drilling Program; ODP Differences in regional responses to climate fluctuations are well documented on short time scales (e.g., El Niño-Southern Oscillation), but with the exception of latitudinal temperature gradients, regional patterns are seldom considered in discussions of ancient greenhouse climates. Contrary to the expectation of global warming or global cooling implicit in most treatments of climate evolution over millions of years, this paper shows that the North Atlantic warmed by as much as 6°C (1.5% decrease in d18O values of planktic foraminifera) during the Maastrichtian global cooling interval. We suggest that warming was the result of the importation of heat from the South Atlantic. Decreasing North Atlantic d18O values are also associated with increasing gradients in planktic d13C values, suggesting increasing surface-water stratification and a correlated strengthening of the North Atlantic Polar Front. If correct, this conclusion predicts arctic cooling during the late Maastrichtian. Beyond implications for the Maastrichtian, these data demonstrate that climate does not behave as if there is a simple global thermostat, even on geologic time scales. |
| title | Strontium and oxygen isotope data for DSDP Hole 44-390A and ODP Leg 171 holes |
| topic | 171-1049C; 171-1050C; 171-1052E; 44-390A; Blake Nose, North Atlantic Ocean; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Joides Resolution; Leg171B; Leg44; North Atlantic Ocean; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.722600 |