声速剖面EOF表示的第一模态解析
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摘要
为实现对声速剖面EOF表示后第一模态时间系数和空间函数变化规律的解析,提出了一种简化的声速剖面变化模型,即"拐点"深度值和声速值的变化;声速梯度的变化和表层海水温度周期性变化所引起的海水声速变化,通过将4种因素所引起的第一模态空间函数的变化规律与实际声速剖面簇第一模态空间函数的变化规律对比,分析引起实测声速剖面变化的主要因素,最后,分别用深海和浅海实测声速剖面数据对其进行验证。
In order to analyze the change law of the time coefficient and spatial function of the first model of the sound speed profile represented by EOF,a simplified model is put forward to express the change law of the sound speed profile,including changes in the depth and sound velocity values of the inflection point.Changes in sound speed gradients and changes in the speed of sound of seawater caused by periodic changes in sea surface temperature.By comparing the change law of the first modal space function caused by the four factors with the change law of the first modal spatial function of the actual speed profile,the main factors causing the change of the actual speed profile are analyzed.Finally,this method is validated by using observed sound velocity profile data from deep sea and shallow sea.
In order to analyze the change law of the time coefficient and spatial function of the first model of the sound speed profile represented by EOF,a simplified model is put forward to express the change law of the sound speed profile,including changes in the depth and sound velocity values of the inflection point.Changes in sound speed gradients and changes in the speed of sound of seawater caused by periodic changes in sea surface temperature.By comparing the change law of the first modal space function caused by the four factors with the change law of the first modal spatial function of the actual speed profile,the main factors causing the change of the actual speed profile are analyzed.Finally,this method is validated by using observed sound velocity profile data from deep sea and shallow sea.
引文
[1] Davis R E.Predictability of sea surface temperature and sea level pressure anomalies over the North Pacific Ocean.[J].Journal of Physical Oceanography,1976,6(3):249-266.
[2] 张志伟,暴景阳,林建炬.多波束测量声速剖面EOF表示阶次选取研究[J].海洋测绘,2017,37(5):17-21.
[3] Leblanc L R,Middleton F H.An underwater acoustic sound velocity data model[J].Journal of the Acoustical Society of America,1980,67(6):2055-2062.
[4] 沈远海,马远良,屠庆平,等.浅水声速剖面用经验正交函数(E0F)表示的可行性研究[J].应用声学,1999,18(2):21-25.
[5] 沈远海,马远良,屠庆平,等.浅水声速剖面的反演方法与实验验证[J].西北工业大学学报,2000,18(2):212-215.
[6] 丁继胜,周兴华,唐秋华,等.多波束勘测声速剖面场的EOF表示方法[J].武汉大学学报:信息科学版,2007,32(5):446- 449.
[7] 孙文川,暴景阳,金绍华,等.多波束海底地形畸变校正与声速剖面反演[J].武汉大学学报:信息科学版,2016,41(3):349-355.
[8] 张旭,张永刚,张健雪,等.台湾以东海域声速剖面序列的EOF分析[J].海洋科学进展,2010,28(4):498-506.
[9] 张伟涛,张韧,王辉瓒,等.基于Argo观测资料的南海北部海域声速场时空特征分析[J].海洋通报,2013,32(3):275-280.
[10] Salon S,Crise A,Picco P,et al.Sound speed in the Mediterranean Sea:an analysis from a climatological data set[J].Annales Geophysicae,2002,21(3):833-846.
[11] 刘伯胜,雷家煜.水声学原理[M].哈尔滨:哈尔滨工程大学出版社,2010.
[12] Munk W H.Sound channel in an exponentially stratified ocean,with application to SOFAR[J].Journal of the Acoustical Society of America,1974,55(2):220-226.
[13] Fujimoto H,Kanazawa T,Murakami H.Seafloor Acoustic Ranging and the Effect of Temperature Variation[J].Gravity,Geoid and Marine Geodesy.1997:690- 695.
[2] 张志伟,暴景阳,林建炬.多波束测量声速剖面EOF表示阶次选取研究[J].海洋测绘,2017,37(5):17-21.
[3] Leblanc L R,Middleton F H.An underwater acoustic sound velocity data model[J].Journal of the Acoustical Society of America,1980,67(6):2055-2062.
[4] 沈远海,马远良,屠庆平,等.浅水声速剖面用经验正交函数(E0F)表示的可行性研究[J].应用声学,1999,18(2):21-25.
[5] 沈远海,马远良,屠庆平,等.浅水声速剖面的反演方法与实验验证[J].西北工业大学学报,2000,18(2):212-215.
[6] 丁继胜,周兴华,唐秋华,等.多波束勘测声速剖面场的EOF表示方法[J].武汉大学学报:信息科学版,2007,32(5):446- 449.
[7] 孙文川,暴景阳,金绍华,等.多波束海底地形畸变校正与声速剖面反演[J].武汉大学学报:信息科学版,2016,41(3):349-355.
[8] 张旭,张永刚,张健雪,等.台湾以东海域声速剖面序列的EOF分析[J].海洋科学进展,2010,28(4):498-506.
[9] 张伟涛,张韧,王辉瓒,等.基于Argo观测资料的南海北部海域声速场时空特征分析[J].海洋通报,2013,32(3):275-280.
[10] Salon S,Crise A,Picco P,et al.Sound speed in the Mediterranean Sea:an analysis from a climatological data set[J].Annales Geophysicae,2002,21(3):833-846.
[11] 刘伯胜,雷家煜.水声学原理[M].哈尔滨:哈尔滨工程大学出版社,2010.
[12] Munk W H.Sound channel in an exponentially stratified ocean,with application to SOFAR[J].Journal of the Acoustical Society of America,1974,55(2):220-226.
[13] Fujimoto H,Kanazawa T,Murakami H.Seafloor Acoustic Ranging and the Effect of Temperature Variation[J].Gravity,Geoid and Marine Geodesy.1997:690- 695.