Revised paleoaltimetry data show low Tibetan Plateau elevation during the Eocene

Science
Svetlana BotsyunJeremy K Caves Rugenstein

Abstract

Paleotopographic reconstructions of the Tibetan Plateau based on stable isotope paleoaltimetry methods conclude that most of the Plateau's current elevation was already reached by the Eocene, ~40 million years ago. However, changes in atmospheric and hydrological dynamics affect oxygen stable isotopes in precipitation and may thus bias such reconstructions. We used an isotope-equipped general circulation model to assess the influence of changing Eocene paleogeography and climate on paleoelevation estimates. Our simulations indicate that stable isotope paleoaltimetry methods are not applicable in Eocene Asia because of a combination of increased convective precipitation, mixture of air masses, and widespread aridity. Rather, a model-data comparison suggests that the Tibetan Plateau only reached low to moderate (less than 3000 meters) elevations during the Eocene, reconciling oxygen isotope data with other proxies.

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Citations

Nov 7, 2019·Science Advances·Alex FarnsworthRichard D Pancost
Oct 15, 2019·The New Phytologist·Andrew L HippSusana Valencia-Avalos
Mar 2, 2019·Science·Douwe J J van Hinsbergen, Lydian M Boschman
Dec 11, 2020·Science Advances·Xiaomin FangYu Chen
Jun 19, 2021·Communications Biology·Tao DengShanqin Chen
Jun 25, 2021·Nature Communications·Zhengfu GuoJiaqi Liu
Jul 1, 2021·Nature Communications·James R ThomsonNigel B W Harris
Jul 23, 2021·Scientific Reports·Zongyao YangFengqin Ran

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