Future loss of Arctic sea-ice cover could drive a substantial decrease in California's rainfall.

ABSTRACT: From 2012 to 2016, California experienced one of the worst droughts since the start of observational records. As in previous dry periods, precipitation-inducing winter storms were steered away from California by a persistent atmospheric ridging system in the North Pacific. Here we identify a new link between Arctic sea-ice loss and the North Pacific geopotential ridge development. In a two-step teleconnection, sea-ice changes lead to reorganization of tropical convection that in turn triggers an anticyclonic response over the North Pacific, resulting in significant drying over California. These findings suggest that the ability of climate models to accurately estimate future precipitation changes over California is also linked to the fidelity with which future sea-ice changes are simulated

SUBMITTER: Cvijanovic I 

PROVIDER: S-EPMC5717256 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature