Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

H (Human Geosciences) » H-TT Technology & Techniques

[H-TT18] Development and applications of environmental traceability methods

Tue. May 22, 2018 9:00 AM - 10:30 AM 103 (1F International Conference Hall, Makuhari Messe)

convener:Ichiro Tayasu(Research Institute for Humanity and Nature), Takanori Nakano(Research Institute for Humanity and Nature, Inter-University Research Institute Corporation National Institutes for the Humanities), Keisuke Koba(京都大学生態学研究センター), Chairperson:Nakano Takanori(Research Institute for Humanity and Nature)

9:45 AM - 10:00 AM

[HTT18-04] Sulfur isotopic compositions of sulfate in rainwater in the Kyoto-Osaka-Kobe area

*Yoriko Yokoo1, Masato Kanamaru1, Naoto Ishikawa2 (1.Faculty of Science and Engineering, Doshisha University, 2.Graduate School of Human and Environmental Studies, Kyoto University)

Keywords:sulfur isotope, rainwater, non sea salt sulfate

We determined the sulfur isotope compositions (δ34S) of monthly wet precipitation to elucidate the seasonal and regional variation in the provenance of dissolved sulfate. We collected manthly rainwater samples at Kyoto city and Kyotanabe city in Kyoto, at Neyagawa city in Osaka and at Nishinomiya city in Hyogo from January 2007 to December 2008.
We calculated the non-sea-salt (nss) SO42- and nss-δ34S in monthly rainwater samples on a Na basis. The nss-δ34S were slightly lower than the δ34S in monthly rainwater, indicating the effect of sea-salt on atmospheric deposition are small in the Kyoto-Osaka-Kobe area.
The nssδ34S of monthly rainwater samples showed seasonal variation. The monthly rainwater samples in summer had the lower nss-δ34S, suggesting nssSO42- in atmospheric deposition contained sulfur derived from oil in industrial activities. On the other hand, the nss-δ34S and nss-SO42- deposition in the monthly rainwater samples in winter and spring showed higher than those in summer. These results suggest that the addition of coal from the eastern Asia to nssSO42- in atmospheric deposition were occurred in winter and spring.
Sulfur isotopic compositions of monthly rainwater samples varied depending on seasons and sites, indicating they are useful tracer to study on the provenance of sulfur in atmosphere of urban area.