Numerical study of rainbands associated with extra-tropical cyclones using fine-mesh cloud resolving model

Research Project

Project/Area Number	21540446
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Meteorology/Physical oceanography/Hydrology
Research Institution	Hokkaido University
Principal Investigator	KAWASHIMA Masayuki 北海道大学, 低温科学研究所, 助教 (10281833)
Project Period (FY)	2009 – 2011
Project Status	Completed (Fiscal Year 2011)
Budget Amount *help	¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000) Fiscal Year 2011: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000) Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000) Fiscal Year 2009: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords	温帯低気圧 / 前線 / 雲解像モデル / 気象学
Research Abstract	The structure and formation mechanism of rainbands associated with extra-tropical cyclones were investigated through a series of numerical experiments using fine-mesh cloud resolving models. Idealized simulations of narrow cold frontal rainbands revealed that the development of core-gap structure of the rainbands due to horizontal shear instability depends strongly on the environmental and local vertical shear. Realistic numerical simulations revealed the formation mechanisms of other types of rainbands.