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Natural supersaturation conditions needed for nucleation of air-clathrate hydrates in deep ice sheets
| 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 |
| Relation: | http://www.igsoc.org/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/59590 |
| 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)
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Submitter: 内田 努
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