Influence and its seasonality of the extratropical thermal structure on the formation and variability of atmospheric circulation and associated precipitation bands

2016 Fiscal Year Final Research Report

• Project/Area Number: 25287120
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: The University of Tokyo
• Principal Investigator: Nakamura Hisashi 東京大学, 先端科学技術研究センター, 教授 (10251406)
• Co-Investigator(Kenkyū-buntansha): 西井 和晃 東京大学, 先端科学技術研究センター, 助教 (50623401) ; 三瓶 岳昭 会津大学, コンピュータ理工学部, 准教授 (50571775)
• Co-Investigator(Renkei-kenkyūsha): KOSAKA YU 東京大学, 先端科学技術研究センター, 准教授 (90746398)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 気候 / ジェット気流 / 梅雨前線 / 秋雨前線 / 冬季モンスーン

Outline of Final Research Achievements

Dynamics of the “Western Pacific” pattern, a persistent pressure seesaw that modulates the East Asian winter monsoon has been revealed as a baroclinic dynamical mode. Evidence has been found that different dynamical regimes of the Kuroshio Extension can modulate surface wind and cloud/precipitation bands east of Japan. A new interpretation on the Southern Annular Mode has been proposed as a wobble of an eddy-driven westerly jet between the two states where the jet is under strong influence of oceanic fronts and not.

Free Research Field

数物系科学