(Tenki is the bulletin journal of the Meteorological Society of Japan in Japanese.)
TENKI, Vol. 71, No. 1, pp. 5-9, 2024
Variations of the cloud-amount and latitude of Baiu frontal cloud zone (BFCZ) in July 1982 is studied using satellite observed cloud data CH (cloud-cover of the cloud higher than 400hPa). "LAT-BFCZ (t, λ): latitude of BFCZ" is obtained as the latitude of the maximum CH zone, and "CH-BFCZ (t, λ): cloud-amount in the BFCZ" is obtained from CH (t, φ, λ). Variation of the CH-BFCZ and LAT-BFCZ are studied by the time-spectral analysis. Variation of CH-BFCZ at period of ~7-day and ~4-day, is large in 140-170°E, and 125-150°E, respectively. Variation of LAT-BFCZ at period of ~4-day, ~2.5-day is large over 130-170°E and 130-165°E respectively. Longitudinal wave-length of CH-BFCZ is estimated by longitude-spectral analysis at each observation time. Short wave (wave length of 10-30°) were significant in 7, 10, 12, 18, 23 and 27 July.
(Tenki is the bulletin journal of the Meteorological Society of Japan in Japanese.)
TENKI, Vol. 71, No. 2, pp. 57-68, 2024
Scenarios, a tool for analyzing uncertain futures, play a central role in assessing long-term climate change issues. Interdisciplinary scenario studies have been conducted to evaluate future climate change, possible impacts and adaptation, and mitigation, and these strands of research have been the core of assessment reports of the Intergovernmental Panel on Climate Change (IPCC). Recently, interest in scenarios has been growing also among stakeholders such as companies and local governments. Here, we review the framework of the Representative Concentration Pathways (RCPs) and Shared Socioeconomic Pathways (SSPs), which have been the main focus of the IPCC reports, and summarize the current status and future issues. In Japan, there are issues to be addressed, such as making models open-source, collaboration with stakeholders, human resource development, and inter-agency funding.
(Tenki is the bulletin journal of the Meteorological Society of Japan in Japanese.)
TENKI, Vol. 71, No. 4, pp. 143-152, 2024
Mt. Fuji radar observed mesoscale precipitation systems aligned at intervals of ~150km, along the Baiu front at 23 UTC Jun 25, 1970. Observational data showed that these precipitation systems located along the northside of the moist stream associated with low-level jet-stream. The mesoscale variations of precipitation and wind, related with the mesoscale precipitation shown by the radar observation, are found at Oshima Island station. Baiu frontal precipitation zone and low-level jet stream are clearly shown by reanalysis data and mesoscale numerical model. However, neither reanalysis data nor mesoscale numerical model express features of the mesoscale precipitation systems observed by the radar observation.