The phase transformation of methane caused by pressure change during its rising from seepage, revealed by video observation and acoustic reflection data

Tuesday, 16 December 2014
Daiki Aoyama and Chiharu Aoyama, Japan's Independent Institute, Tokyo, Japan
The plume comes out to the surface of the water, and methane is released for low water temperature and low temperature in the Arctic Ocean by the atmosphere. Methane released by the atmosphere is combined with oxygen and becomes carbon dioxide and the water, and the greenhouse effect is higher in 20 times than carbon dioxide. If quantity of the methane plume is quantified, I may estimate the quantity of existing methane underground and can estimate the scale of methane melting into it in seawater. The methane plume solved in seawater is one element of the carbon cycle. It is important that I elucidate this element in thinking about the carbon cycle of the wide sense. However, there is not the report that I showed quantitatively how much methane melts into it in seawater a year from the methane plume. Therefore, in this article, I identified an aspect of gush methane as it by the sound data with the fishfinder and by a gush picture of the methane plume. With that in mind, I quantified the quantity of the methane plume. As a result, the following things became clear. The methane hydrate grain to gush out from a gush mouth is a solid at the bottom of the sea direct top. In this sea area, methane of 7.7*104m3 per unit area gushes out. In addition, the sea area where 6.3*106m3 gushed out existed.