全球变化知识资源中心

The Late Cretaceous was a greenhouse world, characterized by elevated temperatures and high atmospheric pCO(2) . Even in the context of an extreme greenhouse climate, existing planktic foraminiferal delta O-18 data from the Falkland Plateau (paleolatitude of similar to 55 degrees S) suggest anomalous warmth, with sea-surface temperatures (SSTs) >30 degrees C for much of the Late Cretaceous, followed by sudden cooling in the Campanian. Over the last two decades, there has been discussion as to whether these high delta O-18-based SSTs reflect a genuine temperature signal and, if so, whether there was a local temperature anomaly in the South Atlantic or whether the data are representative of zonal paleotemperatures at 55 degrees S. To provide new insights into the degree of ocean warming in the southern high latitudes during the Late Cretaceous (Cenomanian to Campanian), new SST records from the Falkland and Kerguelen Plateaus are presented here using the organic geochemical paleothermometer TetraEther indeX of 86 carbon atoms (TEX86). Overall, the TEX86 data support the delta O-18 data, indicating extreme and widespread warmth in the middle to high southern latitudes in the Late Cretaceous, with SSTs from 27 to 37 degrees C. Crucially, the TEX(86 )data show slow, steady cooling from the Turonian to the Campanian and suggest that temperature gradients during the Campanian did not become as steep as suggested by some planktic foraminiferal data.