| 声速剖面EOF表示的第一模态解析 |
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| 引用本文： | 孙文舟,殷晓冬,暴景阳,李树军.声速剖面EOF表示的第一模态解析[J].海洋测绘,2019,39(3):31-35. |
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| 作者姓名： | 孙文舟 殷晓冬 暴景阳 李树军 |
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| 作者单位： | 海军大连舰艇学院 军事海洋与测绘系,辽宁 大连,116018;武汉大学 测绘学院,湖北 武汉,430079 |
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| 基金项目： | 国家重点研发计划(2016YFB0501701)；国家自然科学基金(41874016；41571441) |
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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。
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| 关 键 词： | 声速剖面 经验正交函数 声速梯度 声速剖面标准方程 方差贡献度 |
The First Model Analysis of Sound Speed Profile Represented by EOF |
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| SUN Wenzhou,YIN Xiaodong,BAO Jingyang,LI Shujun.The First Model Analysis of Sound Speed Profile Represented by EOF[J].Hydrographic Surveying and Charting,2019,39(3):31-35. |
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| Authors: | SUN Wenzhou YIN Xiaodong BAO Jingyang LI Shujun |
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| Institution: | Department of Military Oceanography and Hydrography,Dalian Naval Academy,Dalian 116018 ,China;School of Geodesy and Geomatics,Wuhan University,Wuhan 430079 ,China |
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| Abstract: | 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. |
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| Keywords: | sound velocity profile empirical orthogonal function sound velocity gradient sound speed profile standard equation variance contribution |
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