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| Title | Monthly Precipitation Collected at Hirosaki, Japan: Its Tritium Concentration and Chemical and Stable Isotope Compositions | |
|---|---|---|
| Author 1 | Haruka Kuwata | |
| Author 2 | Naofumi Akata | |
| Author 3 | Kazusa Okada | |
| Author 4 | Masahiro Tanaka | |
| Authors 5- | Hirofumi Tazoe, Naoyuki Kurita, Nao Otashiro, Ryoju Negami, Takahito Suzuki, Yuki Tamakuma, Yoshitaka Shiroma, Masahiro Hosoda | |
| Subject | Atmosphere | |
| Subject_sub1 | ||
| Subject_sub2 | ||
| Abstract | Monthly precipitation samples were collected at Hirosaki, Aomori Prefecture from January 2018 to December 2020 to measure the ion species and stable hydrogen and oxygen isotope ratios in order to understand the regional properties. The tritium concentration ranged from 0.28 to 1.20 Bq/L, with mean values (±S.D.) of 0.52±0.18, 0.67±0.25 and 0.63± 0.21 Bq/L in 2018, 2019 and 2020, respectively. This concentration level was almost the same as for Rokkasho, Aomori Prefecture. The tritium concentration had clear seasonal variation: high in the spring and low in the summer. This trend was thought to arise from seasonal fluctuations in the atmospheric circulation. On the other hand, the pH tended to be low, and the electrical conductivity (EC) tended to be high from the winter to the spring. The ion components, which major ion species contained in sea salt, also tended to be high in the winter, and these components had a strong influence on EC. The d-excess values were high in the winter and low in the summer, and when this trend was considered from the viewpoint of the wind direction data in Hirosaki, these dust components were attributed to the northwest monsoon in the winter to the spring coming from the Asian continent. | |
| Temporal coverage | February, 2018 ~ December, 2020 | |
| Spatial coverage | 40.599444 N, 140.467222 E | |
| File format | CSV | |
| Language | English | |
| Discovery metadata record | ||
| Publisher | Center for Research in Radiation, Isotopes, and Earth System Sciences, University of Tsukuba | |
| Publication year | 2025 | |
| Publication date | 7th of May | |
| Digital Object Identifier (DOI) | 10.34355/IREM.Hirosaki.U.00292 Data Download (9KB) | |
| Short DOI | ||
| Citation text | Kuwata, H., Akata, N., Okada, K., Tanaka, M., Tazoe, H., Kurita, N., Otashiro, N., Negami, R., Suzuki, T., Tamakuma, Y., Shiroma, Y., & Hosoda, M. (2025). Monthly precipitation collected at Hirosaki, Japan: its tritium concentration and chemical and stable isotope compositions [Dataset]. Center for Research in Radiation, Isotopes, and Earth System Sciences, University of Tsukuba. https://doi.org/10.34355/IREM.Hirosaki.U.00292 | |
| Serial at center | 00292 | |
| Serial at each Univ./Institute | HIRO0014 | |
| Key word 1 | monthly precipitation | |
| Key word 2 | tritium | |
| Key word 3 | background level | |
| Key word 4 | regional property | |
| Remarks | ||