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This study focuses on heat and mass exchange processes in hydrate foam duringits formation from methane bubbles in gas hydrate stability zone (GHSZ) of theLake Baikal and following delivery of it in open container to the lake surface.The foam was formed as a result of methane bubble collection with atrap/container. The trap was inverted glass beaker of diameter of 70 mm and 360mm long. Open bottom end of the beaker used as enter for bubbles ascended fromthe lakebed. At a depth of 1400 m all bubbles which fed to the trap weretransformed here into solid hydrate foam. The sensitive thermometer was mountedin the middle of the trap and recorded the temperature inside trap. The fate ofthe bubbles in the trap was recorded by video-camera. During ascend within GHSZwith velocity of about 0.375 m/s we observed the continuous decrease of thetemperature in the foam up to a level of negative magnitude in a depth intervalof 1400 - 750 meters. Above 750 m temperature decrease was changed by smallgrowth. However once the trap ascended above top boundary of GHSZ at a depth of380 m, the temperature fell sharply. Falling to a negative values -0.25 oC, thetemperature sharply stabilized and did not changed further until the trapreached the surface. The decreasing of the temperature during the ascent is dueto the cooling of gas as a result of the performing of the work against theforces of hydrostatic pressure. The temperature drop at the boundary of theGHSZ is due to the absorption of heat by the decomposition of hydrate.

Temperature effects in deep-water hydrate foam