Japan Geoscience Union Meeting 2016

Presentation information


Symbol A (Atmospheric and Hydrospheric Sciences) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS12] Atmospheric Chemistry

Wed. May 25, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Hitoshi Irie(Center for Environmental Remote Sensing, Chiba University), Toshinobu Machida(National Institute for Environmental Studies), Hiroshi Tanimoto(National Institute for Environmental Studies), Yoko Iwamoto(Faculty of Science Division I, Tokyo University of Science)

5:15 PM - 6:30 PM

[AAS12-P11] Causes leading to enhancements in sulfur dioxide concentration observed by MAX-DOAS in Kyusyu

*Takaya Okuzaki1, Hitoshi Irie1 (1.Chiba University)

Keywords:SO2, MAX-DOAS, valcano

We performed continuous observations of sulfur dioxide (SO2) using the Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) at Kasuga in Kyushu, Japan. Spectra measured at 310-320 nm were analyzed with the DOAS method to retrieve mean SO2 concentrations for a 0-1 km layer with a horizontal scale of about 10 km. This spatial scale is expected to provide useful inputs for data assimilation. This study focuses on continuous data acquired in July-August 2014. In the period, seven days were identified as the SO2 level was high (>5 ppbv). Back trajectory analysis indicates that there were two categories; the one from a volcanic origin and the other from a continental origin. A high SO2 plume observed on July 8 was found to originate from Sakurajima volcano. Plumes with SO2 higher than 10 ppbv observed on July 30 and August 7 and 13 were from the Aso volcano. High SO2 observed on August 14 could be affected by both volcanoes. On the other hand, high SO2 plumes observed on July 12 did not pass over volcanoes but over China for about 1 day. Very high SO2 of 20 ppbv was observed on July 21. This is suggestted to be due to a rapid transport of high SO2 plumes from South Korea.