title: Madden-Julian Oscillation prediction skill of a new-generation global model demonstrated using a supercomputer.
abstract: Global cloud/cloud system-resolving models are perceived to perform well in the prediction of the Madden-Julian Oscillation (MJO), a huge eastward -propagating atmospheric pulse that dominates intraseasonal variation of the tropics and affects the entire globe. However, owing to model complexity, detailed analysis is limited by computational power. Here we carry out a simulation series using a recently developed supercomputer, which enables the statistical evaluation of the MJO prediction skill of a costly new-generation model in a manner similar to operational forecast models. We estimate the current MJO predictability of the model as 27 days by conducting simulations including all winter MJO cases identified during 2003-2012. The simulated precipitation patterns associated with different MJO phases compare well with observations. An MJO case captured in a recent intensive observation is also well reproduced. Our results reveal that the global cloud-resolving approach is effective in understanding the MJO and in providing month-long tropical forecasts.
authors.affiliation: Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan.
authors.forename: Tomoki
authors.initials: T
authors.lastname: Miyakawa
authors.affiliation: 1] Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan [2] Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa 277-8568, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Satoh
authors.affiliation: 1] Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan [2] Department of Earth and Planetary Science, The University of Tokyo, Tokyo 113-0033, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Miura
authors.affiliation: 1] Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan [2] Advanced Institute for Computational Science, RIKEN, Kobe 650-0047, Japan.
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Tomita
authors.affiliation: Advanced Institute for Computational Science, RIKEN, Kobe 650-0047, Japan.
authors.forename: Hisashi
authors.initials: H
authors.lastname: Yashiro
authors.affiliation: Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan.
authors.forename: Akira T
authors.initials: AT
authors.lastname: Noda
authors.affiliation: Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan.
authors.forename: Yohei
authors.initials: Y
authors.lastname: Yamada
authors.affiliation: Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan.
authors.forename: Chihiro
authors.initials: C
authors.lastname: Kodama
authors.affiliation: Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa 277-8568, Japan.
authors.forename: Masahide
authors.initials: M
authors.lastname: Kimoto
authors.affiliation: Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan.
authors.forename: Kunio
authors.initials: K
authors.lastname: Yoneyama