[A-CG30] Extratropical oceans and atmosphere

[ACG30-15] Climatic Hotspot2 project in Japan: results from its four years

*Masami Nonaka¹ (1.Application Laboratory, Japan Agency for Marine-Earth Science and Technology)

Keywords:air-sea interactions, mid-latitude, Climatic hotspot

Frequency of extreme rainfalls and snowfalls has been increasing these years, and those events severely affect human lives and properties. It has been considered that tropical ocean and atmosphere variability as well as the warming climate, remotely influences mid-latitude extreme weather/climate, while the mid-latitude ocean is passive to atmospheric variability. We have, however, rediscovered strong warm current and associated strong ocean frontal zones as “climate hotspot”, and elucidated mechanisms of ocean-atmosphere interactions. The research progress has prompted a new crucial task: application of such new knowledge to predictions of extreme rainfalls/snowfalls and climate variability. For the new task, in the five-year research project called “Climatic Hotspot2”, we have conducted studies to further our understandings of mid-latitude ocean-atmosphere interaction processes. In the fourth year of the project, three major observation campaigns in the western North Pacific Ocean to the south-east of Hokkaido, the East China Sea and Japan Sea were conducted successfully. Also, we have conducted oceanic and atmospheric high-resolution numerical modeling studies. Those studies have revealed crucial influence of oceanic structures and ocean-atmosphere interactions on climate extreme events. In this presentation, we introduce results obtained in the project.<quillbot-extension-portal></quillbot-extension-portal>