Ice sheet expansion in the Cretaceous greenhouse world.

ABSTRACT: Globally elevated temperatures during the Cretaceous extreme greenhouse climate interval were punctuated by the Valanginian cooling event, which was characterized by a positive carbon isotope excursion, global cooling, and a glacial event approximately at 135 Ma. Disentangling ocean temperature and continental ice volume trends enables us to better understand climate fluctuations over deep time. We investigated the ocean temperature-ice sheet dynamics of glaciation events that occurred in the Cretaceous greenhouse world. New clumped isotope and δ ¹⁸O data from sites in the Tethyan Ocean show that seawater temperatures decreased by 5-6 °C, consistent with the development of glacial periods, and maximum ice volumes about half the size of present-day Antarctica. This cooling

SUBMITTER: Wang T 

PROVIDER: S-EPMC11670679 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature