Japan Meteorological Agency

Characteristics of quasi‐stationary band‐shaped precipitation systems in Japan between 1989 and 2022

Abstract Quasi‐stationary band‐shaped precipitation systems (QBPSs) are the major cause of localized heavy‐rainfall events (HREs) in Japan. Using hourly radar/raingauge‐analysed precipitation amounts from 1989 to 2022, we statistically examined the occurrence characteristics of Q...

Tsunami-Resilient Coastal Reconstruction in Japan After the 2011 M9 Earthquake and Tsunami: Field Surveys and Numerical Modelling

Abstract For the first time, this study presents a critical assessment of Japan’s coastal reconstruction following the March 2011 M 9.0 earthquake and tsunami, integrating numerical modelling with field surveys. Extensive surveys were conducted at 20 coastal sites, comparing post...

Extratropical teleconnections in a multi-model ensemble nudged towards the observed QBO

The Quasi-Biennial Oscillation (QBO), the dominant mode of interannual variability of monthly-mean zonal winds and temperatures in the equatorial stratosphere, has a significant influence on the circulation in other regions of the stratosphere and troposphere in boreal winter. To...

Environments of quasi-stationary linear precipitation system associated with Baiu frontal depressions

Abstract Heavy rainfall in Japan is often caused by quasi-stationary linear precipitation systems (QSLPSs), which frequently occur in association with Baiu frontal depressions (BFDs). While the importance of the roles of BFDs in QSLPS occurrence has been suggested by previous cas...

Radiocarbon in atmospheric CH 4 and CO 2 at Jungfraujoch in 2019–2024: influence of regional nuclear emissions and current global atmospheric 14 CH 4 signal

Abstract. Radiocarbon (14C) is a valuable tracer to determine the relative fossil fractions of emitted carbonaceous greenhouse gases, such as CO2 and CH4. While atmospheric ∆14CO2 measurements have been conducted at multiple sites for several decades, ∆14CH4 measurements remain m...

Impact-based forecasting in Japan: a review of the Japan meteorological agency’s real-time risk map “Kikikuru”

Abstract Impact‑Based Forecasting (IBF) has attracted international attention as an approach to enhance disaster risk management by linking weather forecast information to concrete societal actions. This review examines the implementation of IBF in Japan, focusing on the Real‑tim...

Emotional responses and perceptions of false alarms in flood warnings and their impact on evacuation action: an empirical analysis of the Kyushu Region, Japan

Abstract Repeated false alarms for adverse weather events may reduce people’s willingness to take appropriate actions, such as evacuation. Therefore, understanding how false alarms influence perceptions and actions is essential for building effective early warning systems (EWS)....

Impact of a Stratocumulus Scheme on Clouds and Feedbacks in MIROC7

Abstract Marine stratocumulus (Sc) clouds exert a strong cooling effect on climate by reflecting solar radiation, yet many climate models underestimate their amount and cause uncertainty in equilibrium climate sensitivity (ECS). Herein, we show that incorporating a physically bas...