Refinement of ICESat-2 derived inland water surface levels with the TG20 local geoid model: In the case of Türkiye lakes

IF 3 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Physics and Chemistry of the Earth Pub Date : 2025-03-06 DOI:10.1016/j.pce.2025.103900

Yunus Kaya , Fusun Balik Sanli , Saygin Abdikan

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Abstract

This study examined the contribution of the Türkiye Geoid 2020 (TG20) local gravitational model to water height estimation using ICESat-2 ATL13 data. We tested eight separate lakes in Türkiye to achieve this aim. The EGM2008 values were determined by a comparison of the orthometric heights derived from ATL13 data and the ellipsoidal heights derived from ATL03 data. Subsequently, the corresponding latitude and longitude values within the local gravitational model were obtained and integrated into the ICESat-2 data. The root mean square error (RMSE) for the unfiltered and filtered ATL13_EGM2008 data was 0.66 m and 0.53 m, respectively. The filtering method in the ATL13_TG20 data resulted in an average improvement of the RMSE from 0.62 m to 0.27 m. The local gravity model refinement tested in 8 different lakes showed an RMSE improvement ranging from 17% to 71%. This study demonstrates that local gravity models significantly improve the vertical accuracy of ICESat-2.

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本研究利用 ICESat-2 ATL13 数据检验了 Türkiye Geoid 2020 (TG20) 本地重力模型对水高估算的贡献。为此，我们测试了图尔基耶的八个独立湖泊。通过比较 ATL13 数据得出的正高和 ATL03 数据得出的椭球高，确定了 EGM2008 值。随后，在当地重力模型中获得了相应的经纬度值，并将其整合到 ICESat-2 数据中。未经过滤和过滤的 ATL13EGM2008 数据的均方根误差（RMSE）分别为 0.66 米和 0.53 米。在 ATL13TG20 数据中采用过滤方法后，均方根误差平均从 0.62 米减小到 0.27 米。在 8 个不同湖泊中测试的本地重力模型改进显示，均方根误差减小了 17% 到 71%。这项研究表明，局部重力模型大大提高了 ICESat-2 的垂直精度。

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来源期刊

Physics and Chemistry of the Earth 地学-地球科学综合

CiteScore

5.40

自引率

2.70%

发文量

176

审稿时长

31.6 weeks

期刊介绍： Physics and Chemistry of the Earth is an international interdisciplinary journal for the rapid publication of collections of refereed communications in separate thematic issues, either stemming from scientific meetings, or, especially compiled for the occasion. There is no restriction on the length of articles published in the journal. Physics and Chemistry of the Earth incorporates the separate Parts A, B and C which existed until the end of 2001. Please note: the Editors are unable to consider submissions that are not invited or linked to a thematic issue. Please do not submit unsolicited papers. The journal covers the following subject areas: -Solid Earth and Geodesy: (geology, geochemistry, tectonophysics, seismology, volcanology, palaeomagnetism and rock magnetism, electromagnetism and potential fields, marine and environmental geosciences as well as geodesy). -Hydrology, Oceans and Atmosphere: (hydrology and water resources research, engineering and management, oceanography and oceanic chemistry, shelf, sea, lake and river sciences, meteorology and atmospheric sciences incl. chemistry as well as climatology and glaciology). -Solar-Terrestrial and Planetary Science: (solar, heliospheric and solar-planetary sciences, geology, geophysics and atmospheric sciences of planets, satellites and small bodies as well as cosmochemistry and exobiology).