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Seismic observations from a Yakutat eddy in the northern Gulf of Alaska
Tang, QS; Gulick, SPS; Sun, LT; ltsun@scsio.ac.cn
2014
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN2169-9275
卷号119期号:6页码:3535-3547
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.
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
学科领域Oceanography
资助者CNES; NSFC [41176026, 41376023]; NSF [EAR-0408584, EAR-1009986] ; CNES; NSFC [41176026, 41376023]; NSF [EAR-0408584, EAR-1009986] ; CNES; NSFC [41176026, 41376023]; NSF [EAR-0408584, EAR-1009986] ; CNES; NSFC [41176026, 41376023]; NSF [EAR-0408584, EAR-1009986]
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收录类别sci
资助项目海洋地质
资助者CNES; NSFC [41176026, 41376023]; NSF [EAR-0408584, EAR-1009986] ; CNES; NSFC [41176026, 41376023]; NSF [EAR-0408584, EAR-1009986] ; CNES; NSFC [41176026, 41376023]; NSF [EAR-0408584, EAR-1009986] ; CNES; NSFC [41176026, 41376023]; NSF [EAR-0408584, EAR-1009986]
WOS记录号WOS:000340414800018
引用统计
被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/10619
专题中科院边缘海地质重点实验室
通讯作者ltsun@scsio.ac.cn
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GB/T 7714
Tang, QS,Gulick, SPS,Sun, LT,et al. Seismic observations from a Yakutat eddy in the northern Gulf of Alaska[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2014,119(6):3535-3547.
APA Tang, QS,Gulick, SPS,Sun, LT,<sun@scsio.ac.cn.(2014).Seismic observations from a Yakutat eddy in the northern Gulf of Alaska.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,119(6),3535-3547.
MLA Tang, QS,et al."Seismic observations from a Yakutat eddy in the northern Gulf of Alaska".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 119.6(2014):3535-3547.
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