Strontium and oxygen isotope data for DSDP Hole 44-390A and ODP Leg 171 holes, supplement to: MacLeod, Kenneth G; Huber, Brian T; Isaza-Londoño, Carolina (2005): North Atlantic warming during global cooling at the end of the Cretaceous. Geology, 33(6), 437-440

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...

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Bibliographic Details
Main Authors: MacLeod, Kenneth G, Huber, Brian T, Isaza-Londoño, Carolina
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 2005
Subjects:
Drilling/drill rig
Leg44
Leg171B
Glomar Challenger
Joides Resolution
Deep Sea Drilling Project DSDP
Ocean Drilling Program ODP
Arctic
Macleod
Foraminifera*
Global warming
North Atlantic
Online Access:https://dx.doi.org/10.1594/pangaea.722600
https://doi.pangaea.de/10.1594/PANGAEA.722600
Description
Summary: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.

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