The Influence of Sediments, Lithosphere and Upper Mantle (Anelastic) With Lateral Heterogeneity on Ocean Tide Loading and Ocean Tide Dynamics
The Influence of Sediments, Lithosphere and Upper Mantle (Anelastic) With Lateral Heterogeneity on Ocean Tide Loading and Ocean Tide Dynamics
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DOI：
10.1029/2022jb025200
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Pingping Huang;R. Sulzbach;V. Klemann;Yoshiyuki Tanaka;H. Dobslaw;Z. Martinec;Maik Thomas
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文献类型：
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作者：
Pingping Huang;R. Sulzbach;V. Klemann;Yoshiyuki Tanaka;H. Dobslaw;Z. Martinec;Maik Thomas
海潮负荷(OTL)和海潮动力学(OTD)受地球内部结构的影响，后者受自吸引和负荷(SAL)势的影响。结合三维地球模型Lyon和LITHO1.0，我们构造了一个混合模型来量化沉积物、大洋和大陆岩石圈以及滞弹性上地幔对OTL和OTD的耦合效应。与Prem相比，这种更逼真的3D模型产生的垂直OTL位移明显更大，M2、K1和MF OTL的垂直OTL位移分别高达3.9、2.6和0.1 mm。此外，与663个全球导航卫星系统站的OTL观测相比，它的矢量差减小了0.1 mm，幅度差减小了0.2 mm，证实了这些地球特征的累积效应。另一方面，我们发现对OTD有更大范围和更大幅度的共振影响，特别是对M2和K1潮汐。具体地说，这种影响分别集中在M2和K1的0-6毫米和0-1.5毫米范围内，远远大于对SAL的影响(主要分别在0-2毫米和0-1.0毫米范围内)。由于对垂直位移的影响与现代数据约束海洋潮汐模型的精度相当，需要通过加载垂直位移来修正地心潮汐，我们认为它在OTD模拟中具有潜在的好处。
Ocean tide loading (OTL) and ocean tide dynamics (OTD) are known to be affected by Earth's internal structures, with the latter being affected by the self‐attraction and loading (SAL) potential. Combining the 3D earth models Lyon and LITHO1.0, we construct a hybrid model to quantify the coupled effect of sediments, oceanic and continental lithosphere, and anelastic upper mantle on OTL and OTD. Compared to PREM, this more realistic 3D model produces significantly larger vertical OTL displacement by up to 3.9, 2.6, and 0.1 mm for the M2, K1, and Mf OTL, respectively. Moreover, it shows a smaller vector difference of 0.1 mm and a smaller amplitude difference of 0.2 mm than PREM with OTL observations at 663 Global Navigation Satellite System stations, a confirmation of the cumulative effect due to these earth features. On the other hand, we find a resonant impact of wider extent and larger magnitude on OTD, especially for the M2 and K1 tides. Specifically, this impact is concentrated in the ranges 0–6 mm and 0–1.5 mm for M2 and K1, respectively, which is considerably larger than the impact on SAL (mostly in the ranges 0–2 mm and 0–1.0 mm, respectively). Since the effect on vertical displacement is at a similar level compared to the accuracy of modern data‐constrained ocean tide models that require correction of the geocentric tide by loading induced vertical displacements, we regard its consideration to be potentially beneficial in OTD modeling.