基于卫星测高重力数据的南海海平面变化研究  

Research on sea level changes in the South Sea based on satellite altimetry gravity data

作　　者：谢友鸽 XIE Youge(Department of Architecture and Civil Engineering,Rizhao Polytechnic,Rizhao 276800,China)

机构地区：[1]日照职业技术学院建筑工程系,山东日照276800

出　　处：《海洋测绘》2024年第5期5-9,共5页Hydrographic Surveying and Charting

基　　金：国家自然科学基金(42274006)。

摘　　要：为明确南海海平面时空变化特征,同时分析海水质量与海平面变化的相互关系,提出了测高卫星数据(1993年1月—2015年12月)联合时变重力数据(2004年1月—2015年12月)利用最小二乘直线拟合和Morlet小波分析南海海平面变化的方法。研究结果表明:近23年南海海平面上升速率为5.81 mm/a,海水质量增加贡献了22.4%的海平面上升,南海近岸区域海平面异常大于中部区域,平均海平面异常谷值和峰值分别为-4.31 cm和5.68 cm,海平面和海水质量上升速率总体呈现东北高西南低的分布形态,海平面异常和海水质量变化量的周期性都以1a尺度最为明显。南海海平面上升显著,中南部海域海平面异常相对稳定,边缘区域受接壤季风影响波动相对较大,海水质量和海平面时空变化特征基本一致。This paper proposes a method that combines altimetry satellite data with time-varying gravity data for analyzing the sea level of the South Sea by using the least square linear fitting method and Morlet wavelet.This method can clarify the spatiotemporal variation characteristics of sea levels in the South Sea and analyze the relationship between ocean mass and sea level changes.The results revealed that,in the past 23 years,the sea level rise rate in the South Sea was 5.81 mm/a,and 22.4%of the sea level rise was brought by the increased ocean mass.The sea level anomaly in the coastal area of the South Sea is larger than that in the central area.The average sea level anomaly valley is-4.31 cm,and the peak is 5.68 cm.The sea level and sea water mass rise rate showed the spatial characteristics of high in northeast and low in southwest.The periodicity of sea level anomaly and sea water mass change was most obvious at a scale of 1a.The sea level in the South Sea rose significantly,and the sea level anomaly in the central and southern seas was relatively stable.The marginal area was relatively affected by the monsoon fluctuation,and the spatiotemporal variation characteristics were basically the same as those of ocean mass.

关 键 词：测高卫星 南海海平面变化 海平面异常 海水质量变化 GRACE重力卫星 

分 类 号：P229[天文地球—大地测量学与测量工程]