Extraction of ocean tides in the Bohai Sea from GFO satellite altimeter via a modified tidal harmonic analysis algorithm

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY Continental Shelf Research Pub Date : 2024-04-13 DOI:10.1016/j.csr.2024.105231

Haidong Pan , Junchuan Sun , Tengfei Xu , Zexun Wei

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Abstract

Exact tidal information is essential for multifarious human activities in the global ocean. Satellite altimeters especially Topex/Poseidon (T/P) and Jason series play fundamental roles in improving our understanding of global tides. Compared to T/P-Jason series, other satellite altimeters such as Geosat Follow-On (GFO) have been rarely used in tidal studies mainly due to their unfavorable aliasing features for tidal estimates. Classical harmonic analysis requires 12-year GFO records to fully resolve eight major tidal constituents while the longest GFO data is only 8-year. As a result, it is challenging for classical harmonic analysis to derive reliable tidal estimates from short GFO records. In this study, a modified tidal harmonic analysis algorithm based on the credo of smoothness (i.e. MHACS) is introduced to extract ocean tides from GFO records in the Bohai Sea. Via utilizing the inherent natural links between main constituents, MHACS breaks the constraint of the Rayleigh criterion and effectively solves tidal aliasing problems in GFO records. Practical experiments indicate that GFO-derived tidal constants via MHACS have high consistencies with the tidal theory and satellite-based EOT20 tidal model. Spatially-averaged vector difference between the EOT20 model and GFO results in the Bohai Sea is only 2.12 cm (eight major constituents averaged). Moreover, except for GFO, MHACS also has the potential to be applied to sun-synchronous satellites such as Envisat, Sentinel series, and Haiyang series.

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通过改进的潮汐谐波分析算法从 GFO 卫星高度计提取渤海海洋潮汐信息

准确的潮汐信息对人类在全球海洋中的各种活动至关重要。卫星高度计，特别是 Topex/Poseidon（T/P）和 Jason 系列，在提高我们对全球潮汐的认识方面发挥着重要作用。与 T/P-Jason 系列相比，Geosat Follow-On (GFO) 等其他卫星高度计很少用于潮汐研究，主要原因是它们的混叠特征不利于潮汐估算。经典的谐波分析需要 12 年的 GFO 记录才能完全解析八个主要潮汐成分，而最长的 GFO 数据只有 8 年。因此，要从较短的 GFO 记录中得出可靠的潮汐估算值，对经典谐波分析是一个挑战。本研究引入了一种基于平滑信条的修正潮汐谐波分析算法（即 MHACS），从渤海的 GFO 记录中提取海洋潮汐。通过利用主要成分之间固有的自然联系，MHACS 打破了瑞利准则的限制，有效地解决了 GFO 记录中的潮汐混叠问题。实际实验表明，通过 MHACS 得出的 GFO 潮汐常数与潮汐理论和基于卫星的 EOT20 潮汐模型具有很高的一致性。在渤海，EOT20 模型与 GFO 结果的空间平均矢量差仅为 2.12 厘米（8 个主要成分的平均值）。此外，除 GFO 外，MHACS 还有可能应用于环境卫星、哨兵系列和海洋系列等太阳同步卫星。

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来源期刊

Continental Shelf Research 地学-海洋学

CiteScore

4.30

自引率

4.30%

发文量

136

审稿时长

6.1 months

期刊介绍： Continental Shelf Research publishes articles dealing with the biological, chemical, geological and physical oceanography of the shallow marine environment, from coastal and estuarine waters out to the shelf break. The continental shelf is a critical environment within the land-ocean continuum, and many processes, functions and problems in the continental shelf are driven by terrestrial inputs transported through the rivers and estuaries to the coastal and continental shelf areas. Manuscripts that deal with these topics must make a clear link to the continental shelf. Examples of research areas include: Physical sedimentology and geomorphology Geochemistry of the coastal ocean (inorganic and organic) Marine environment and anthropogenic effects Interaction of physical dynamics with natural and manmade shoreline features Benthic, phytoplankton and zooplankton ecology Coastal water and sediment quality, and ecosystem health Benthic-pelagic coupling (physical and biogeochemical) Interactions between physical dynamics (waves, currents, mixing, etc.) and biogeochemical cycles Estuarine, coastal and shelf sea modelling and process studies.