- 著者
- FUJIBE Fumiaki MATSUMOTO Jun SUZUKI Hideto
- 出版者
- The Association of Japanese Geographers
- 雑誌
- Geographical review of Japan series B (ISSN:18834396)
- 巻号頁・発行日
- vol.92, no.2, pp.72-83, 2020-03-31 (Released:2020-03-31)
- 参考文献数
- 34
- 被引用文献数
- 2 5
A series of statistical analyses are made to find the dependence of heat and cold mortalities on the temperature and economic states of municipalities in Japan, using vital statistics data for 18 years, from 1999 to 2016. A partial correlation analysis for 1,207 municipalities over the country has indicated that heat and cold mortalities are positively and negatively correlated with summer and winter temperatures, respectively, while they are both negatively correlated with annual income and positively correlated with municipality population. These features are essentially common to genders, age groups, and regions, and indicate that heat and cold mortalities depend on both climatic and socioeconomic factors. An additional analysis of 151 wards in Tokyo and 12 other government-designated cities has also shown a correlation between heat/cold mortality and income; in particular, exceptionally high mortality is found in some wards which have areas with poor living conditions.
- 著者
- FUJIBE Fumiaki
- 出版者
- Meteorological Society of Japan
- 雑誌
- 気象集誌. 第2輯 (ISSN:00261165)
- 巻号頁・発行日
- pp.2018-021, (Released:2018-01-23)
- 被引用文献数
- 1
Climatological features of surface air temperature variations on time scales of a few minutes to one hour were examined using one-minute data, spanning a four-year period, from 917 automated stations in Japan. The temperature time series was spectrally analyzed after the application of a Gaussian high-pass filter, and the variances with periods of 64 minutes or less were statistically analyzed as sub-hourly temperature variations. The result obtained shows that daytime temperature variation is observed throughout the country with relatively small regional differences. The amplitudes of daytime temperature variations were larger during spring and summer than those during autumn and winter, and under high temperature and sunny weather than under low temperature, no sunshine, and precipitation. A cross spectral analysis of temperature and wind speed reveals that temperature peaks tend to coincide with or lag behind wind speed minima. The variation is likely to correspond to the convective motion in the mixing layer. On the other hand, the intensity of nighttime temperature variation showed a large amount of scatter among stations, with exceptionally large variations during winter at some stations in northern and eastern Japan. Nighttime temperature variation tends to be in-phase with wind speed variation, with longer periods than daytime temperature variation, and is more intense under low temperature and low wind speed than under high temperature, high wind speed, and precipitation. Stations with large winter nighttime temperature variations tend to be located on a col or a slope, where the surface inversion layer is likely to be easily disturbed by any kind of atmospheric motion.
- 著者
- FUJIBE Fumiaki MATSUMOTO Jun
- 出版者
- The Association of Japanese Geographers
- 雑誌
- Geographical review of Japan series B (ISSN:18834396)
- 巻号頁・発行日
- vol.95, no.2, pp.55-68, 2022-12-29 (Released:2022-12-28)
- 参考文献数
- 32
- 被引用文献数
- 2
Warm season precipitation in most parts of Japan comprises early summer (Baiu) and autumn (Shūrin) rainy periods with a relatively dry mid-summer. We aimed to determine details on the features of the seasonal progress of precipitation during the warm season in Japan. We assessed the timing of maximum and minimum precipitation based on daily records of Japanese dense local Kunai observations and AMeDAS networks collected at 522 stations for 95 years from 1926 to 2020. The maximum precipitation during Baiu has a northward delay, with a transition zone from the end of June to around July 10 at about 37°N, whereas Shūrin has three precipitation peaks corresponding to late August, mid-September, and early October over a wide area of Japan. The timing and intensity of the precipitation maximum varies according to the El Niño-Southern Oscillation (ENSO) phase, but the northward delay of the Baiu peak and multiple Shūrin peaks are found both in El Niño and La Niña years. Toward the past 30 years, the Baiu has lengthened, the mid-summer minimum is earlier, and the main peak of Shūrin precipitation has become less distinct.
- 著者
- FUJIBE Fumiaki MATSUMOTO Jun
- 出版者
- The Association of Japanese Geographers
- 雑誌
- Geographical review of Japan series B (ISSN:18834396)
- 巻号頁・発行日
- vol.96, no.2, pp.41-49, 2023-12-25 (Released:2023-12-28)
- 参考文献数
- 21
The relationship between summer mortality and mean temperature in Japan was analyzed using monthly data from 1951 to 2020. During this period, the mortality rate decreased greatly and the elderly population has largely increased in Japan. A positive correlation between mortality rate and temperature was detected for all the analysis periods except for a highly disturbed feature before 1970, whereas the range of age-adjusted mortality variation per 1°C temperature anomaly has decreased by a factor of 5–10, indicating that the sensitivity of mortality to temperature has weakened over time. However, the mortality rate for deaths directly caused by heat decreased from the 1950s to the 1980s and then increased, showing a V-shaped change over the entire analysis period.
- 著者
- FUJIBE Fumiaki MATSUMOTO Jun SUZUKI Hideto
- 出版者
- The Association of Japanese Geographers
- 雑誌
- Geographical review of Japan series B (ISSN:18834396)
- 巻号頁・発行日
- vol.91, no.1, pp.17-27, 2018-06-29 (Released:2018-06-30)
- 参考文献数
- 19
- 被引用文献数
- 4 12
Regional and seasonal features and the interannual variations of heat stroke mortality in Japan are examined using the Vital Statistics of Japan from 1999 to 2014. We found that heat stroke mortality has different spatial patterns and different dependence on temperature, according to age groups. For the age group under 60, mortality is positively correlated with seasonal mean temperature and is higher in the southern regions of Japan, while the mortality of the age group 80 and over is positively correlated with summer peak temperature, being high in some prefectures in northern to central Honshu, the main island of Japan. The latter group also shows larger interannual variations and a higher increasing trend than the former. As for seasonal variation, heat stroke mortality is high in July–August, with a peak period delay northward, which corresponds to a later temperature peak. Moreover, mortality tends to be higher in July than August by 40–50% even if the monthly mean temperature is equal. These findings are expected to provide a statistical basis to cope with heat load disasters in Japan.