著者
SHIBATA Kiyotaka SAI Ayano
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.2021-019, (Released:2021-01-13)

The surface meteorological data in Japan, beginning around the 1880s, archived by the Japan Meteorological Agency are analyzed focusing on the long–term trends and variations in humidity and temperature. It is found that the annual–mean temperature trend exhibits statistically significant warming of 1.0-2.5°C century−1 for most stations, while the annual–mean relative humidity shows significantly decreasing trend of −2 % to −12 % century−1 for most stations with small seasonality. On the other hand, the annual–mean mixing ratio trend displays a different spatial distribution compared to the temperature or relative humidity trend. In this study, three types of trends exist: significantly positive and negative values, and virtually zero. Significantly negative trends of about −0.2 to −0.3 g kg−1 century−1 are located approximately in the Pacific side of Honshu from the middle Tohoku through Shikoku to the eastern Kyushu. Significantly positive trends of about 0.2 to 0.4 g kg−1 century−1 are observed over Hokkaido, the western Japan along Sea of Japan, the western Kyushu, and the remote islands including Okinawa. The overall pattern is similar for other seasons except for most of the remote islands in winter. Empirical orthogonal function (EOF) analysis indicates that the linear trends in the annual–mean temperature and relative humidity can be almost explained by the nearly uniform persistent warming and drying of EOF–1 components. On the other hand, for the annual–mean mixing ratio, EOF–2 is almost identical with the linear trend component, although the fraction of EOF–2 (14 %) is much smaller than that of EOF–1 (49 %). In recent years from 1960 to 2018 the mixing ratio and temperature trends are very different from those in the longer period from the 1880s. The mixing ratio trend and the temperature trend increase on average from 0.0 to 0.5 g kg−1 century−1 and from 1.5°C to 2.5°C century−1, respectively.

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J-STAGE Articles - 日本列島における地表の水蒸気と気温の1880年代から100年以上の長期のトレンドと変動について https://t.co/3u4mDpB3CX
New JMSJ Article now published online! https://t.co/C2d3jrra53 Shibata, K., and A. Sai, 2021: Long-term trends and variations in surface humidity and temperature in the Japanese archipelago over 100 years from 1880s.- J. Meteor. Soc. Japan, 99, 403-422. https://t.co/9Nyg1zFwVp
J-STAGE Articles - Long–Term Trends and Variations in Surface Humidity and Temperature in the Japanese Archipelago over 100 Years from 1880s https://t.co/8wrMMn9T6W 水蒸気量の100年規模変化を見た点が重要。近年(1960~2018)は長期トレンド(1880~)と比べると変化大。
New Graphical Abstract is now available online! https://t.co/YIDIHClAfa Shibata, K., and A. Sai, 2021: Long-term trends and variations in surface humidity and temperature in the Japanese archipelago over 100 years from 1880s. J. Meteor. Soc. Japan, 99, https://t.co/C2d3jrra53 https://t.co/bGPh8H1z56

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