Earth Sciences

Effects of paleogeographic changes and CO₂ variability on northern mid-latitudinal temperature gradients in the Cretaceous

K. Gianchandani, S. Maor, et al.

Explore how changes in paleogeography during the Cretaceous period influenced sea surface temperatures, suggesting a greater impact than atmospheric CO₂ levels. This intriguing research was conducted by Kaushal Gianchandani, Sagi Maor, Ori Adam, Alexander Farnsworth, Hezi Gildor, Daniel J. Lunt, and Nathan Paldor.

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Abstract

The Cretaceous period (-145 to -66 million years ago, Ma) shows a non-monotonically increasing meridional sea surface temperature (SST) gradient from the Valanginian (-135 Ma) to the Maastrichtian (-68 Ma). This study uses paleoclimate simulations to compare the effects of atmospheric CO₂ variability and paleogeographic changes on this mid-latitudinal SST gradient. A simple model of wind-driven ocean gyres is used to demonstrate how paleogeographic changes weakened subtropical gyre circulation, increasing extratropical SSTs. The results suggest that paleogeographic changes had a greater impact on the mid-latitudinal temperature gradient during the Cretaceous than long-term changes in pCO₂.

Publisher

Nature Communications

Published On

Aug 25, 2023

Authors

Kaushal Gianchandani, Sagi Maor, Ori Adam, Alexander Farnsworth, Hezi Gildor, Daniel J. Lunt, Nathan Paldor

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