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学科主题: Oceanography
题名: Seismic observations from a Yakutat eddy in the northern Gulf of Alaska
作者: Tang, QS ; Gulick, SPS ; Sun, LT
通讯作者: ltsun@scsio.ac.cn
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
发表日期: 2014
卷: 119, 期:6, 页:3535-3547
收录类别: sci
部门归属: [Tang, Q. S. ; Sun, L. T.] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China ; [Gulick, S. P. S.] Univ Texas Austin, Inst Geophys, Jackson Sch Geosci, Austin, TX USA
项目归属: 海洋地质
资助者: CNES; NSFC [41176026, 41376023]; NSF [EAR-0408584, EAR-1009986]
摘要: Recent works show that the seismic oceanography technique allows us to relate water column seismic reflections to oceanic finescale structures. In this study, finescale structures of a surface anticyclonic eddy have been unveiled by reprocessing two seismic transects acquired in the northern Gulf of Alaska using an 8 km hydrophone streamer and 6600 cu in linear airgun array in September 2008. The eddy was a typical bowl-like structure with around 55 km width and 700 m depth. It has two fringes around the eddy base and a spiral arm at the NE edge. The in situ sea surface temperature and salinity data from a shipboard thermosalinograph help to confirm our interpretations of a spiral arm shed from the warm eddy and the entrained cold water from elsewhere. Nearby the eddy and offshore the shelf-break, there is a strong frontal feature, probably the Alaska Current. The eddy likely formed offshore Yakutat shelf and transported along the offshore shelf-break by tracking the sea level anomalies. Its equivalent diameter of 65 km was measured using the along-track altimeter and the seismic constraints. It was comparable with results from the representative conventional algorithms of eddy detection. Geostrophic velocities of the eddy were estimated from the dipping seismic reflections under the assumptions of approximate isopycnals and geostrophic balance. Measured water properties including sea surface temperature, salinity, and chlorophyll revealed that eddy translation transports coastal water to the pelagic regions. Structures synthesized from CTD profiles that sampled an earlier eddy suggest that thin striae around the base might be a common feature in Gulf of Alaska eddies.
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WOS记录号: WOS:000340414800018
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10619
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Tang, QS; Gulick, SPS; Sun, LT.Seismic observations from a Yakutat eddy in the northern Gulf of Alaska,JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2014,119(6):3535-3547
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