10:45 AM - 11:00 AM
[MIS16-07] Gas plume and anomaly atmospheric CH4 concentration
Keywords:Shallow gas hydrate, Gas plume, Methane (CH4)
We observed the higher CH4 concentrations nearby a gas plume point (<5 km) in some gas plume site. Since the anomaly of atmospheric CH4 concentration may be attributed to anthropogenic origins from land, satellite data (ASCAT and WindSat) observing the wind direction were used to screen wind directions. The water temperature profile differed depending on the sea area, and it seemed to be related to anomaly atmospheric concentration.
This study was conducted under the commission from AIST as a part of the methane hydrate research project funded by METI (the Ministry of Economy, Trade and Industry, Japan). We appreciate the support of the crew onboard R/V No.7 Kaiyo-maru during the 7K14, 7K15.