非潮汐海洋负载效应对近海岸IGS测站坐标时间序列的影响

发布时间：2018-04-09 13:01

本文选题：非潮汐海洋负载效应　切入点：近海岸区域　出处：《大地测量与地球动力学》2016年11期

【摘要】：根据均匀分布在全球各大洲的IGS测站信息,选取105个数据质量良好的近海岸测站以及29个内陆测站,利用ECCO发布的海底压力数据计算得到由非潮汐海洋负载引起的IGS测站位置N、E、U方向上的位移。分析了由地理位置差异导致的测站受非潮汐海洋负载效应的影响存在的差异,并修正了SOPAC提供的IGS测站坐标时间序列,探讨了非潮汐海洋负载效应引起的测站位移对近海岸测站坐标时间序列的影响。结果表明,近海区域(50km)测站受到非潮汐海洋负载影响U方向平均量级为5mm,远大于内陆(500km)测站U方向的影响;经过非潮汐海洋负载修正,71%的测站高程坐标时间序列RMS值得以减小,其中最大可使RMS值降低13%;大西洋、太平洋西海岸受其影响比东海岸大,考虑到其受非潮汐海洋负载效应影响显著,使用大西洋与太平洋西海岸地区测站坐标时间序列前必须进行非潮汐海洋负载修正。
[Abstract]:According to the information of IGS stations distributed uniformly on all continents, 105 offshore stations with good data quality and 29 inland stations are selected.The displacement of the position of the IGS station is calculated by using the pressure data released by ECCO in the direction of the IGS station caused by the non-tidal ocean load.In this paper, the difference between the stations caused by the geographical location difference under the influence of the non-tidal ocean load effect is analyzed, and the coordinate time series of the IGS station provided by SOPAC are corrected.The influence of the station displacement caused by the non-tidal ocean load effect on the coordinate time series of the offshore stations is discussed.The results show that the average value of U direction is 5mm, which is much larger than that of inland station (500km), and the RMS of the time series of elevation coordinates of 71% of the stations corrected by the non-tidal ocean load is worth reducing.The largest of these decreases the RMS value by 13 percent; the west coast of the Atlantic and Pacific Ocean is affected more than the east coast, considering that it is significantly affected by non-tidal ocean load effects,Non-tidal ocean load correction must be carried out before using the time series of station coordinates in the west coast of the Atlantic and Pacific Ocean.
【作者单位】：武汉大学GNSS研究中心;武汉大学测绘学院;
【基金】：国家自然科学基金(41374033)~~
【分类号】：P228.4;P229

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