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A mechanism of ice-band pattern formation caused by resonant interaction between sea ice and internal waves [an abstract of entire text]
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| Title: | A mechanism of ice-band pattern formation caused by resonant interaction between sea ice and internal waves [an abstract of entire text] |
| Other Titles: | 海氷と内部波の共鳴相互作用によるアイスバンド形成機構 [全文の要約] |
| Authors: | 佐伯, 立 Browse this author |
| Issue Date: | 24-Mar-2016 |
| Publisher: | Hokkaido University |
| Abstract: | Ice bands are frequently observed over marginal ice zones in polar seas. A typical ice band pattern has a regular spacing of about 10 km and extends over 100 km in marginal ice zone. Further, the long axis of an ice band lies to the left (right) with respect to the wind direction in the Northern (Southern) Hemisphere. Here we show that the resonance between ice-band pattern propagation and internal inertia-gravity waves below the sea ice well explains the ice-band pattern formation. Internal waves are generated by the difference between the stress on the open water and the stress on ice-covered water, as well as the difference in the angle between these stresses. This in turn reinforces to form ice band pattern with a regular band spacing. Using a 1.5-layer model we have specifically found that:1.A band spacing on the order of 10 km is selected for by the resonance condition in which the ice-band pattern propagation speed coincides with the phase speed of internal inertia-gravity waves.2.The ice bands tend to develop favorably when the wind direction and the band-propagation direction are nearly parallel. The velocity acceleration caused by the periodic differential stress associated with the ice bands, driven by the wind parallel to the band propagation direction, is important. The wind direction may turn to the left (right) slightly in the Northern (Southern) Hemisphere as a result of the Coriolis force acting on ice.A continuously stratified ocean model, coupled with an sea-ice model, is also used to examine the above theoretical results. Satellite images also confirmed that the band spacing of the ice-band pattern in the polar seas is consistent with this theory and numerical results. |
| Description: | この博士論文全文の閲覧方法については、以下のサイトをご参照ください。 |
| Description URI: | https://www.lib.hokudai.ac.jp/dissertations/copy-guides/ |
| Conffering University: | 北海道大学 |
| Degree Report Number: | 甲第12217号 |
| Degree Level: | 博士 |
| Degree Discipline: | 環境科学 |
| Examination Committee Members: | (主査) 教授 三寺 史夫, 教授 大島 慶一郎, 講師 中村 知裕, 助教 豊田 威信, 教授 山口 一 （東京大学大学院新領域創成科学研究科） |
| Degree Affiliation: | 環境科学院（地球圏科学専攻） |
| Type: | theses (doctoral - abstract of entire text) |
| URI: | http://hdl.handle.net/2115/62102 |
| Appears in Collections: | 学位論文 (Theses) > 博士 （環境科学）
課程博士 (Doctorate by way of Advanced Course) > 環境科学院(Graduate School of Environmental Science)
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