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Natural supersaturation conditions needed for nucleation of air-clathrate hydrates in deep ice sheets

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Title: Natural supersaturation conditions needed for nucleation of air-clathrate hydrates in deep ice sheets
Authors: Uchida, Tsutomu Browse this author →KAKEN DB
Yasuda, Keita Browse this author
Ot, Yuya Browse this author
Shen, Renkai Browse this author
Ohmura, Ryo Browse this author
Keywords: clathrate hydrates
crystal growth
ice core
Issue Date: 4-Feb-2015
Publisher: International Glaciological Society
Journal Title: Journal of glaciology
Volume: 60
Issue: 224
Start Page: 1111
End Page: 1116
Publisher DOI: 10.3189/2014JoG13J232
Abstract: We apply new phase-equilibrium data of air-clathrate hydrates to the distribution of air hydrates in deep ice sheets to better understand their nucleation conditions. By comparing the depths at which the hydrates first appear to the phase-equilibrium condition, we estimated the critical size of an air-hydrate nucleus in an ice sheet to be similar to 50 nm. The estimated energy barrier for nucleation, based on the temperature dependence of supersaturation, is much smaller than that estimated previously for the pure ice system. Thus, the bubble surface may either act as a type of heterogeneous nucleus, or contain heterogeneous nuclei, for hydrate formation. Competition between nucleation-promotion and nucleation-inhibition factors may increase variation in nucleation rates, resulting in variation of the depth range of the bubble hydrate transition zones.
Rights: © 2015 International Glaciological Society
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 内田 努

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