Publikationsdatum:
2024-01-09
Beschreibung:
The classic paleotemperature record based on d18O data from pelagic foraminiferal calcite suggests that equatorial sea-surface temperatures during the Maastrichtian (~12-20°C) were much cooler than today (~27-29°C). Such cool equatorial temperatures contradict basic theories of tropical atmospheric and ocean dynamics. We report d18O data from remarkably well preserved rudist aragonite and magnesian calcite cements of Maastrichtian age (~69+/-1 Ma) from the carbonate platform of Wodejebato guyot in the western Pacific. These data suggest that equatorial sea-surface temperatures in the Maastrichtian (best estimate ~27-32°C) were at least as warm as today. This finding helps reconcile the geologic d18O record with ocean-atmospheric dynamic theory and implies a reduction in the poleward heat flux required by global climate simulations of greenhouse conditions.
Schlagwort(e):
144-877A; Calculated average/mean values; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Iron; Joides Resolution; Leg144; Magnesium; Manganese; North Pacific Ocean; Number of observations; Ocean Drilling Program; ODP; Sample code/label; Sample type; Strontium; δ13C, carbonate; δ18O, carbonate
Materialart:
Dataset
Format:
text/tab-separated-values, 42 data points
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