Ocean tide loading (OTL) displacements from global and local grids: comparisons to GPS estimates over the shelf of Brittany, France
Ocean tide loading (OTL) displacements from global and local grids: comparisons to GPS estimates over the shelf of Brittany, France
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DOI：
10.1007/s00190-007-0185-6
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发表时间：
2008-06
影响因子：
4.4
通讯作者：
S. Melachroinos;R. Biancale;M. Llubes;F. Perosanz;F. Lyard;M. Vergnolle;M. Bouin;F. Masson;J. Nicolas;L. Morel;S. Durand
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文献类型：
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作者：
S. Melachroinos;R. Biancale;M. Llubes;F. Perosanz;F. Lyard;M. Vergnolle;M. Bouin;F. Masson;J. Nicolas;L. Morel;S. Durand
在本文中，我们研究OTL位移检测的GPS站的一个专门的运动和验证海潮模型。我们的研究区域是法国的布列塔尼和科唐坦大陆架。布列塔尼是世界上少数几个潮汐引起垂直位移10-12厘米和水平位移几厘米的地方之一。海洋潮汐模型在这一地区有很大的差异。测试了七个全球和区域海潮模型：FES 2004，针对K2、TPXO.7.0、TPXO.6.2、GOT00.2、CSR4.0、NAO.99b和东北大西洋最新区域网格（NEA 2004）进行了校正。利用两种不同的算法对这些网格化的海潮振幅和相位进行卷积，以得到预测的OTL位移。使用位于布列塔尼北海岸的8个GPS观测站为期3.5个月的数据，以评估OTL效应的地理分布。我们已经在我们的GPS软件GINS 7.1中修改并实现了新的算法。基于1天批溶液估计GPS OTL组分。在全球和区域网格上，我们将观测到的M2、S2、N2和K1波的GPS OTL分量与选定的海潮模型进行了比较。在圣米歇尔山湾，在M2的半日带预测和GPS/模式之间的大的相位滞后和振幅差异超过20°和1.5厘米的垂直方向上被检测到。从最小二乘谱分析的GPS时间序列，显着的谐波峰值的轨道周期的GPS卫星的整数倍进行观察，表明存在的多径效应的GPS OTL成分。GPS OTL观测值与FES 2004、NEA 2004、GOT 00.2和CSR 4.0潮汐模型的拟合效果最好。
In this paper we examine OTL displacements detected by GPS stations of a dedicated campaign and validate ocean tide models. Our area of study is the continental shelf of Brittany and Cotentin in France. Brittany is one of the few places in the world where tides provoke loading displacements of ∼10–12 cm vertically and a few cm horizontally. Ocean tide models suffer from important discrepancies in this region. Seven global and regional ocean tide models were tested: FES2004 corrected for K2, TPXO.7.0, TPXO.6.2, GOT00.2, CSR4.0, NAO.99b and the most recent regional grids of the North East Atlantic (NEA2004). These gridded amplitudes and phases of ocean tides were convolved in order to get the predicted OTL displacements using two different algorithms. Data over a period of 3.5 months of 8 GPS campaign stations located on the north coast of Brittany are used, in order to evaluate the geographical distribution of the OTL effect. We have modified and implemented new algorithms in our GPS software, GINS 7.1. GPS OTL constituents are estimated based on 1-day batch solutions. We compare the observed GPS OTL constituents of M2, S2, N2and K1waves with the selected ocean tide models on global and regional grids. Large phase-lag and amplitude discrepancies over 20° and 1.5 cm in the vertical direction in the semi-diurnal band of M2between predictions and GPS/models are detected in the Bay of Mont St-Michel. From a least squares spectral analysis of the GPS time-series, significant harmonic peaks in the integer multiples of the orbital periods of the GPS satellites are observed, indicating the existence of multipath effects in the GPS OTL constituents. The GPS OTL observations agree best with FES2004, NEA2004, GOT00.2 and CSR4.0 tide models.