Causes of the long-term variability of southwestern South America precipitation in the IPSL-CM6A-LR model

Julian Villamayor (1) , Myriam Khodri (1) , Ricardo Villalba (2) , Valérie Daux (3, 4)

1 VARCLIM - Océan et variabilité du climat
2 CONICET-IANIGLA - Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales [Mendoza]
3 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
4 GEOTRAC - Géochrononologie Traceurs Archéométrie

Southwestern South America (SWSA) has undergone frequent and persistent droughts in recent decades with severe impacts on water resources, and consequently, on socioeconomic activities at a sub-continental scale. The local drying trend in this region has been associated with the expansion of the subtropical drylands over the last decades. It has been shown that SWSA precipitation is linked to large-scale dynamics modulated by internal climate variability and external forcing. This work aims at unravelling the causes of this long-term trend toward dryness in the context of the emerging climate change relying on a large set simulations of the state-of-the-art IPSL-CM6A-LR climate model from

Keywords: External forcing; Decadal variability; Subtropical Andes drying trend Hadley Cell expansion; Future scenarios; Detection and attribution; CMIP6

Domains: Environmental Sciences

Julian Villamayor, Myriam Khodri, Ricardo Villalba, Valérie Daux. Causes of the long-term variability of southwestern South America precipitation in the IPSL-CM6A-LR model. Climate Dynamics, 2021, ⟨10.1007/s00382-021-05811-y⟩. ⟨insu-03230914⟩