Seasonal variability of tritium and ion concentrations in rain at Kumamoto, Japan and back-trajectory analysis of air mass
- Radioisotope Center, Kyushu Univ., Hakozaki, Higashi-ku, Fukuoka 812-8581 (Japan)
- Graduate School of Science and Technology, Kumamoto Univ., Kurokami, Kumamoto 860-8555 (Japan)
Tritium and major ion concentrations in rain were analyzed in Kumamoto (Japan)) between 2001 and 2006 to examine present tritium concentration and seasonal variation. The average tritium concentration was 0.36 {+-} 0.19 Bq/L (n=104) and higher tritium concentrations were observed in spring than the other seasons. Among the ions, non-sea-salt (nss) SO{sub 4}{sup 2}'- showed higher concentration in winter while other ions did not show marked increase in winter. Based on the back-trajectory analyses of air masses, the increase in tritium concentrations in spring arises from downward movement of naturally produced tritium from stratosphere to troposphere, while the increase of the nss-SO{sub 4}{sup 2-} concentrations in winter is due to long range transport of pollutants from China to Japan. (authors)
- OSTI ID:
- 22109364
- Journal Information:
- Fusion Science and Technology, Vol. 54, Issue 1; Conference: 8. international conference on tritium science and technology, Rochester, NY (United States), 16-21 Sep 2007; Other Information: Country of input: France; 10 refs; ISSN 1536-1055
- Country of Publication:
- United States
- Language:
- English
Similar Records
Background tritium concentrations of river and lake waters in Japan
Annual and seasonal global temperature changes in the troposphere and low stratosphere, 1960-85