利用反射地震数据和XBT数据联合反演海水的温盐分布
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摘要
利用地震数据反演海水的温盐分布是地震海洋学研究的一个重要方向.本文分析了采集于伊比利亚半岛西南缘海域的GOLR12低频地震数据和同步观测的XBT(eXpendable BathyThermograph)、CTD(Conductivity-Temperature-Depth)资料,将叠后约束波阻抗反演方法应用到海水温度、盐度剖面的计算当中,计算结果显示这种反演方法可以提供水平分辨率为6.25m的温度和盐度资料,温度的精度约为0.16℃,可以为物理海洋学研究提供高横向分辨率的基础数据.
Seismic oceanography has been widely used to detect many kinds of oceanographic features as a new oceanographic prospecting method.Inversion for temperature and salinity distributions from seismic data is a very important research field in seismic oceanography.We analyzed low frequency seismic data from one multichannel seismic(MCS)line acquired in the scope of the European GO Project(line GOLR-12)combined with the simultaneously acquired XBT(eXpendable BathyThermograph)and CTD(Conductivity-Temperature-Depth)data,which are located to the southwest of the Iberian Peninsula.We used a post-stack constrained impedance inversion method to derive temperature and salinity distributions of sea water and the result demonstrated that this method can indeed provide reliable temperature and salinity distribution profiles every 6.25m along the seismic line,with the temperature resolution of 0.16℃.This method applied to good quality MCS data can provide high lateral-resolution temperature and salinity profiles for oceanographic research,using only a few oceanographic measurements to constrain the inversion procedure.
Seismic oceanography has been widely used to detect many kinds of oceanographic features as a new oceanographic prospecting method.Inversion for temperature and salinity distributions from seismic data is a very important research field in seismic oceanography.We analyzed low frequency seismic data from one multichannel seismic(MCS)line acquired in the scope of the European GO Project(line GOLR-12)combined with the simultaneously acquired XBT(eXpendable BathyThermograph)and CTD(Conductivity-Temperature-Depth)data,which are located to the southwest of the Iberian Peninsula.We used a post-stack constrained impedance inversion method to derive temperature and salinity distributions of sea water and the result demonstrated that this method can indeed provide reliable temperature and salinity distribution profiles every 6.25m along the seismic line,with the temperature resolution of 0.16℃.This method applied to good quality MCS data can provide high lateral-resolution temperature and salinity profiles for oceanographic research,using only a few oceanographic measurements to constrain the inversion procedure.
引文
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[2] Ruddick B,Song H B,Dong C Z,et al.Water column seismic images as maps of temperature gradient.Oceanography,2009,22(1) :192～205
[3] 宋洋,宋海斌,陈林等.利用地震数据反演海水温盐结构.地球物理学报,2010,53(11) :2696～2702 Song Y,Song H B,Chen L,et al.Sea water thermohaline structure inversion from seismic data.Chinese J.Geophys.(in Chinese),2010,53(11) :2696～2702
[4] 宋海斌,董崇志,陈林等.用反射地震方法研究物理海洋-地震海洋学简介.地球物理学进展,2008,23(4) :1156～1164 Song H B,Dong C Z,Chen L,et al.Reflection seismic methods for studying physical oceanography:Introduction of seismic oceanography.Progress in Geophysics (in Chinese),2008,23(4) :1156～1164
[5] 董崇志,宋海斌,郝天珧等.南海东北部海洋内波的反射地震研究.地球物理学报,2009,52(8) :2050～2055 Dong C Z,Song H B,Hao T Y,et al.Studying of oceanic internal wave spectra in the Northeast South China Sea from seismic reflections.Chinese J.Geophys.(in Chinese),2009,52(8) :2050～2055
[6] 宋海斌,LuiS Pinheiro,王东晓等.海洋中尺度涡与内波的地震图像.地球物理学报,2009,52(11) :2775～2780 Song H B,Luis Pinheiro,Wang D X,et al.Seismic images of ocean meso-scale eddies and internal waves.Chinese J.Geophys.(in Chinese),2009,52(11) :2775～2780
[7] 宋海斌,拜阳,董崇志等.南海东北部内波特征--经验模态分解方法应用初探.地球物理学报,2010,53(2) :393～ 400 Song H B,Bai Y,Dong C Z,et al.A preliminary study of application of Empirical Mode Decomposition method in understanding the features of internal waves in the northeastern South China Sea.Chinese J.Geophys.(in Chinese),2010,53(2) .393～400
[8] Pinheiro L M,Song H B,Ruddick B,et al.Detailed 2-D imaging of the Mediterranean outflow and meddies off W Iberia from multichannel seismic data.Journal of Marine Systems,2010,79,89～100
[9] Nandi P,Holbrook W S,Pearse S,et al.Seismic reflection imaging of water mass boundaries in the Norwegian Sea.Geophys.Res.Lett.,2004,31,L23311,doi:10． 1029/2004GL021325
[10] Nakamura Y,Noguchi T,Tsuji T,et al.Simultaneous seismic reflection and physical oceanographic observations of oceanic fine structure in the Kuroshio extension front.Geophys.Res.Lett.,33,2006,L23605,doi:10． 1029/2006GL027437
[11] Tsuji T,Noguchi T,Niino H,et al.Two-dimensional mapping of fine structures in the Kuroshio Current using seismic reflection data.Geophys.Res.Lett.,2005,32, L14609,doi:10． 1029/2005GL023095
[12] Paramo P,Holbrook W S.Temperature contrasts in the water column inferred from amplitude-versus-offset analysis of acoustic reflections.Geophys.Res.Lett.,2005,32,L24611,doi:10． 1029/2005GL024533
[13] Wood W T,Holbrook W S,Sen M K,et al.Full waveform inversion of reflection seismic data for ocean temperature profiles.Geophys.Res.Lett.,2008,35,L04608,doi:10． 1029/2007GL032359
[14] Papenberg C,Klaeschen D,Krahmann G,et al.Ocean temperature and salinity inverted from combined hydrographic and seismic data.Geophys.Res.Lett.,2010,37,L04601,doi:10． 1029/2009GL042115
[15] Hobbs R,et al.GO-Geophysical Oceanography:A new tool to understand the thermal structure and dynamics of oceans.2007,D318 Cruise Rep.,Durham Univ.,Durham,U.K.(Available at http;//www.dur.ac.uk/eu.go/cruise/report.html)
[16] Sallares V,Biescas B,Buffett G,et al.Relative contribution of temperature and salinity to ocean acoustic reflectivity.Geophys.Res.Lett.,2009,36,L00D06,doi;10． 1029/2009GL040187
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