title: Indian Ocean warming modulates Pacific climate change.
abstract: It has been widely believed that the tropical Pacific trade winds weakened in the last century and would further decrease under a warmer climate in the 21st century. Recent high-quality observations, however, suggest that the tropical Pacific winds have actually strengthened in the past two decades. Precise causes of the recent Pacific climate shift are uncertain. Here we explore how the enhanced tropical Indian Ocean warming in recent decades favors stronger trade winds in the western Pacific via the atmosphere and hence is likely to have contributed to the La Niña-like state (with enhanced east-west Walker circulation) through the Pacific ocean-atmosphere interactions. Further analysis, based on 163 climate model simulations with centennial historical and projected external radiative forcing, suggests that the Indian Ocean warming relative to the Pacific's could play an important role in modulating the Pacific climate changes in the 20th and 21st centuries.
authors.affiliation: Research Institute for Global Change and Application Laboratory, Japan Agency for Marine-Earth Science and Technology, Yokohama, Kanagawa 236-0001, Japan. j.luo@bom.gov.au
authors.forename: Jing-Jia
authors.initials: JJ
authors.lastname: Luo
authors.forename: Wataru
authors.initials: W
authors.lastname: Sasaki
authors.forename: Yukio
authors.initials: Y
authors.lastname: Masumoto