| HUANG Xiaodong,ZHAO Wei,TIAN Jiwei,YANG Qingxuan. 2014. Mooring observations of internal solitary waves in the deep basin west of Luzon Strait. Acta Oceanologica Sinica, 33(3):82－89 |
| Mooring observations of internal solitary waves in the deep basin west of Luzon Strait |
| Mooring observations of internal solitary waves in the deep basin west of Luzon Strait |
| Received:December 18, 2012 Revised:May 06, 2013 |
| DOI：10.1007/s13131-014-0416-7 |
| Key words:internal solitary wave South China Sea observation nonlinear internal wave |
| 中文关键词: internal solitary wave South China Sea observation nonlinear internal wave |
| 基金项目:The Program for New Century Excellent Talents in Universities of China under contract No. NCET-10-0764;the National High Technology Research and Development (863) Program of China under contract No. 2013AA09A502;the National Natural Science Foundation of China under contract Nos 41176010, 91028008, 40890153, 41176008 and 40776005. |
| Author Name | Affiliation | E-mail | | HUANG Xiaodong | Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China | | | ZHAO Wei | Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China | weizhao@ouc.edu.cn | | TIAN Jiwei | Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China | | | YANG Qingxuan | Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China | |
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| Abstract: |
| A total of 137 internal solitary waves (ISWs) are captured during a field experiment conducted in the deep basin west of the Luzon Strait (LS) from March to August, 2010. Mooring observations reveal that a fully developed ISW owns a maximum westward velocity of more than 1.8 m/s and an amplitude of about 200 m. The ISWs in the South China Sea (SCS) are most active in July, which may be due to the strong stratification in summer. Most of the ISW episodes are detected around and after the 1st or 15th lunar day, indicating that the ISW in the SCS is triggered by astronomic tides. Half part of the observed ISWs were detected around 19:00 local time, which can be explained by the fact that type-a ISWs emerged in the evening at roughly the same time each day. The propagation direction of the ISWs and the astronomic tides in the LS show that the area south of the Batan Island is probably the main source region of the type-a ISWs, while the area south of Itbayat Island and south of the Batan Island is likely the main source region of the type-b ISWs observed at the mooring. Moreover, for the resonance of semidiurnal internal tides emitting from the double ridges in the LS, the underwater ridge south of the Itbayat Island and south of the Batan Island is believed to favor the generation of the energetic ISWs. |
| 中文摘要: |
| A total of 137 internal solitary waves (ISWs) are captured during a field experiment conducted in the deep basin west of the Luzon Strait (LS) from March to August, 2010. Mooring observations reveal that a fully developed ISW owns a maximum westward velocity of more than 1.8 m/s and an amplitude of about 200 m. The ISWs in the South China Sea (SCS) are most active in July, which may be due to the strong stratification in summer. Most of the ISW episodes are detected around and after the 1st or 15th lunar day, indicating that the ISW in the SCS is triggered by astronomic tides. Half part of the observed ISWs were detected around 19:00 local time, which can be explained by the fact that type-a ISWs emerged in the evening at roughly the same time each day. The propagation direction of the ISWs and the astronomic tides in the LS show that the area south of the Batan Island is probably the main source region of the type-a ISWs, while the area south of Itbayat Island and south of the Batan Island is likely the main source region of the type-b ISWs observed at the mooring. Moreover, for the resonance of semidiurnal internal tides emitting from the double ridges in the LS, the underwater ridge south of the Itbayat Island and south of the Batan Island is believed to favor the generation of the energetic ISWs. |
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