Asian monsoons in a late Eocene greenhouse world

A. Licht (1, 2) , M. Cappelle , Hemmo A. Abels (3) , J.B. Ladant , J. Trabucho-Alexandre , Christian France-Lanord (2) , Y. Donnadieu (4, 5) , J. Vandenberghe , Thomas Rigaudier (2) , Christophe Lécuyer (6, 7) , D. Jr Terry , R. Adrianes , Anaïs Boura (8) , Z. Guo , Aung Naing Soe , J. Quade , Guillaume Dupont-Nivet (9) , Jean-Jacques Jaeger (1)

1 IPHEP - Institut International de Paléoprimatologie, Paléontologie Humaine : Evolution et Paléoenvironnement
2 CRPG - Centre de Recherches Pétrographiques et Géochimiques
3 Paleomagnetic Laboratory ‘Fort Hoofddijk', Utrecht University, Faculty of Geosciences
4 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
5 CLIM - Modélisation du climat
6 LGL-TPE - Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement
7 IUF - Institut Universitaire de France
8 CR2P - Centre de recherche sur la Paléobiodiversité et les Paléoenvironnements
9 GR - Géosciences Rennes

The strong present-day Asian monsoons are thought to have originated between 25 and 22 million years (Myr) ago, driven by Tibetan-Himalayan uplift. However, the existence of older Asian monsoons and their response to enhanced greenhouse conditions such as those in theEocene period (55-34Myrago) are unknownbecause of the paucity of well-dated records. Here we show late Eocene climate records revealing marked monsoon-like patterns in rainfall and wind south and north of the Tibetan-Himalayan orogen. This is indicated by low oxygen isotope values with strong seasonality in gastropod shells and mammal teeth from Myanmar, and by aeolian dust deposition in northwest China. Our climate simulations support modern-like Eocene monsoonal rainfall and show that a reinforced hydrological cycle responding to enhancedgreenhouse conditions counterbalanced the negative effect of lowerTibetanrelief onprecipitation. These strong monsoons later weakened with the global shift to icehouse conditions 34Myr ago.

Domains: Earth Sciences

A. Licht, M. Cappelle, Hemmo A. Abels, J.B. Ladant, J. Trabucho-Alexandre, et al.. Asian monsoons in a late Eocene greenhouse world. Nature, 2014, 513 (7519), pp.501-506. ⟨10.1038/nature13704⟩. ⟨insu-01072603⟩