{"id":10117,"date":"2016-11-15T21:16:42","date_gmt":"2016-11-15T21:16:42","guid":{"rendered":"https:\/\/www.darkenergybiosphere.org\/?post_type=publication&#038;p=10117"},"modified":"2016-11-15T21:16:43","modified_gmt":"2016-11-15T21:16:43","slug":"co2-emission-and-shallow-type-methane-hydrate-decomposition-experiment-on-deep-sea-floor","status":"publish","type":"publication","link":"https:\/\/www.darkenergybiosphere.org\/publication\/co2-emission-and-shallow-type-methane-hydrate-decomposition-experiment-on-deep-sea-floor\/","title":{"rendered":"CO<sub>2<\/sub> emission and shallow-type methane hydrate decomposition experiment on deep-sea floor"},"content":{"rendered":"<p>Increasing anthropogenic CO<sub>2<\/sub> in the atmosphere causes global warming and subsequent environmental changes, which may lead to an increase in natural disasters jeopardizing human society. Prompt technological development for CO<sub>2<\/sub> capture and sequestration is required in the international community. In this study, we performed CO<sub>2<\/sub> emission and shallow-type methane hydrate decomposition experiments at the Joetsu Knoll, offshore Joetsu, Niigata, Japan, as pilot studies to test feasibility of CO<sub>2<\/sub> sequestration and methane recovery using methane-CO<sub>2<\/sub> replacement in shallow-type methane hydrates. An isobaric cylinder pump and probe with a built-in heater (\u201cHeat sonde\u201d) were developed to inject CO<sub>2<\/sub> in deep-sea, high-pressure conditions. Before injecting CO<sub>2<\/sub> into a methane hydrate located in deep-sea sediments, we attempted CO<sub>2<\/sub> emission directly into deep-seafloor. In the experiment, liquid CO<sub>2<\/sub> was emitted at the head of Heat sonde, however, the isobaric cylinder pump became clogged during operation. The result reveals that precipitates of CO<sub>2<\/sub> hydrate, which are generated during mixing of inflow seawater and outflow liquid CO<sub>2<\/sub>, blocked flow lines of the isobaric cylinder pump and Heat sonde. This suggests that our developed instruments must be improved for future work. We also observed the collapse of an exposed methane hydrate layer at the seafloor upon contact with the Heat sonde in our experiment.<\/p>\n","protected":false},"template":"","tags":[],"publication_type":[19],"_links":{"self":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication\/10117"}],"collection":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication"}],"about":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/types\/publication"}],"wp:attachment":[{"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/media?parent=10117"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/tags?post=10117"},{"taxonomy":"publication_type","embeddable":true,"href":"https:\/\/www.darkenergybiosphere.org\/wp-json\/wp\/v2\/publication_type?post=10117"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}