The Effect of Local Tide on Precision Positioning in Shanghai
-
摘要: 针对全球海潮模型在不同沿海地区存在差异性以及在中国近海精度不高的问题,利用全球海潮模型FES2004和NAO99b计算上海地区(经纬度范围为120.85°E~122.2°E,30.6667°N~31.8833°N)S2、M2、K1和O1四个分潮的海潮负荷位移在垂直分量上的差异;并利用中国近海模型osu.chinasea.2010对全球海潮模型FES2004中相应的区域进行替换,计算近海效应对SHJZ站(上海金山)、SHJBS站(上海宝山)、SHAO站(上海佘山)以及DCMD站(上海崇明)四个测站精密定位的影响。结果表明:1) 全球海潮模型FES2004和NAO99b在上海地区存在较明显的差异,尤其是垂直分量,最大接近4 mm,且两个模型的差异随离海洋距离增大而减小;2) 利用修正前后的全球海潮模型FES2004经过计算分析得出,近海效应对上海地区GPS测站精密定位的影响达到5 mm,对测站垂直分量的位移影响从大到小分别是DCMD站(5.1 mm)、SHBS站(4.9 mm)、SHJS(4.2 mm)、SHAO(3.6 mm)。Abstract: In view of the differences of the global tidal model in different coastal areas and the poor accuracy of offshore in China,using the global tide models FES2004 and NAO99b to calculate the vertical component of the tidal load displacements of the four tide components S2、M2、K1and O1 in Shanghai (The range from 120.85 to 122.2 East longitude, 30.6667 to 31.8833 West latitude).In order to calculate the effect of local tide on the precise positioning of four stations of SHJZ station (Shanghai Jinshan), SHJBS station (Shanghai Baoshan), SHAO station (Shanghai Sheshan) and DCMD station (Shanghai Chongming), using the Chinese offshore model osu.chinasea.2010 to replace the corresponding region in the global tide model FES2004.The results show that: (1)There are obvious differences between the global tide models FES2004 and NAO99b in Shanghai, especially in the vertical components. The maximum is close to 4 mm, and the difference between the two models decreases with the distance from the ocean;(2)The influence of offshore effect on the precision positioning of GPS stations in Shanghai reaches 5 mm,and the influence on the vertical component of the station from big to small are DCMD station (5.1 mm), SHBS station (4.9 mm), SHJS (4.2 mm) and SHAO (3.6 mm) respectively.
-
Key words:
- Global ocean tide model /
- China offshore model /
- offshore effects /
- ocean tiding loading
-
[1] 王志刚.中国台湾区域海潮负荷位移建模及精度分析[D].成都:西南交通大学,2017. [2] FARRELL W E.Deformation of the earth by surface loads[J].Reviews of Geophysics & Space Physics,1972,10(3):761-797. [3] 祁仰旭,曲国庆.山东区域海潮负荷对GPS高精度测量的影响[J].山东理工大学学报(自然科学版),2016,30(4):20-23. [4] 赵红,张勤,黄观文,等.基于不同海潮模型研究海潮负荷对GPS精密定位的影响[J].大地测量与地球动力学,2012,32(5):108-112. [5] 曹炳强,成英燕,许长辉.海潮模型对连续跟踪参考站数据解算的影响[J].测绘科学,2015,40(12):108-111. [6] 李大炜,李建成,金永涛,等.利用验潮站资料评估全球海潮模型的精度[J].大地测量与地球动力学,2012,32(4):106-110. [7] 赵红.海潮负荷影响及其模型修正研究[D].西安:长安大学,2013. [8] EGBERT,G D,EROFEEVA,S.Y.Efficient inverse modeling of barotropic ocean tides[J].Journal of Atmospheric and Oceanic Technology,2002,19(2):183-204. [9] 赵红,张勤,瞿伟,等.联合中国近海海潮模型与全球海潮模型分析海潮负荷对GPS精密定位的影响[J].武汉大学学报(信息科学版),2016,41(6):765-771. [10] 周江存,许厚泽,孙和平.近海潮汐效应对测站位移的负荷影响[J].大地测量与地球动力学,2002,22(1):81-86. [11] 付延光,周兴华,周东旭,等.利用验潮站资料的中国近岸海潮模型精度评估[J].测绘科学,2017,42(8):28-32. [12] AGNEW D C.SPOTL:Some programs for oceantide loading [R].Scripps Institution of Oceanography,2012. [13] 张杰,李斐,楼益栋.海潮负荷对GPS精密定位的影响研究[J].武汉大学学报(信息科学版),2013,38(12):1400-1404. [14] 章卫胜,宋志尧,张金善,等.中国近海潮波运动特征分析[C]//第十二届中国海岸工程学术研讨会论文集,2005:455-461. [15] 章卫胜.中国近海潮波运动数值模拟[D].南京:河海大学,2005. [16] MARTENS,H.R, SIMONS,M, OWEN S,et al.Observations of ocean tidal load response in South America from subdaily GPS positions[J].Geophusical Journal International,2016,205(3):ggw087.
点击查看大图
计量
- 文章访问数: 406
- HTML全文浏览量: 55
- PDF下载量: 132
- 被引次数: 0