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学科主题: Geochemistry & Geophysics
题名: Relative contribution of seawater physical property to seismic reflection coefficient
作者: [Dong Chong-Zhi] Second Inst Oceanog, Key Lab Submarine Geosci, Hangzhou 310012, Zhejiang, Peoples R China ; [Song Hai-Bin ; Huang Xing-Hui ; Bai Yang] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China ; [Wang Dong-Xiao] Chinese Acad Sci, South China Sea Inst Oceanol, LED, Guangzhou 510301, Guangdong, Peoples R China
通讯作者: czdong@sio.org.cn
关键词: Seismic oceanography ; Relative contribution ; South China Sea ; Meddy
刊名: CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
发表日期: 2013
卷: 56, 期:6, 页:2123-2132
部门归属: LTO
摘要: The relation between seismic profile and seawater physical property is one of the key problems urgent to be studied in seismic oceanography. This paper choose three groups of CTD data, including the section of Meddy, ten stations at different latitudes of the oceans, monthly data in the northeastern South China Sea, to study the normal and non-normal relative contribution according to the sea area, season and depth of water. The results show that the average normal relative contributions of sound speed and temperature similarly vary with sea area, season and water depth in a range of 78% similar to 94% and 74% similar to 98% respectively, mainly determined by the physical differences between adjacent water masses. The non-normal relative contributions of sound speed and temperature are enhanced with the increasing incidence angle, but the relative contributions of density and salinity are opposite. The prestack seismic data for inversion should contain gathers with a wide range of incidence angles. It is especially important to contain seismic traces with small incidence angle to improve the accuracy of density and salinity inversion which have smaller relative contribution. Through comparing the relative contribution of Meddy with the Turner angle section, it is found that Turner angle has an excellent indicative function to relative contribution. The zone, where the relative contributions of density and salinity are larger, well corresponds to the boundary between double stable region and diffusive region, where Turner angle is about -45 degrees. The density ratios are relatively small at high latitude stations which result in small relative contribution of sound speed and temperature. The relative contributions of sound speed and temperature are slightly larger in the surface seawater in the northeastern South China Sea. This may be caused by temperature difference and density ratio increasing due to the Kuroshio intrusion.
语种: 中文
原文出处: 查看原文
WOS记录号: WOS:000321415200032
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10906
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[Dong Chong-Zhi] Second Inst Oceanog, Key Lab Submarine Geosci, Hangzhou 310012, Zhejiang, Peoples R China; [Song Hai-Bin; Huang Xing-Hui; Bai Yang] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China; [Wang Dong-Xiao] Chinese Acad Sci, South China Sea Inst Oceanol, LED, Guangzhou 510301, Guangdong, Peoples R China.Relative contribution of seawater physical property to seismic reflection coefficient,CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2013,56(6):2123-2132
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