IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Mohammad Bagherbandi, Lars E. Sjöberg
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引用次数: 0

摘要

垂直陆地运动以及地球内部和表面的质量再分布会影响地球重力场。因此,研究地表重力(\left( {\dot{g}} \right)\)和高度(\(\(\dot{h}\))的时间变化之间的比率在地球科学中非常重要,例如,用于还原重力观测、评估卫星重力测量任务以及调整垂直陆地运动模型。Sjöberg和Bagherbandi(2020年)估算了芬诺斯坎迪亚的\(\dot{g}/\dot{h}\)综合比率,该比率基于从挪威瓦格斯特兰达到芬兰约恩苏的63度重力线沿线的相对重力观测数据、芬诺斯坎迪亚上空59个站点观测到的688个绝对重力观测数据、2003年1月至2016年8月期间从GRACE卫星任务中获得的月重力数据以及陆地隆升模型。所有这些数据的加权最小二乘法解为\(\dot{g}/\dot{h}\) = - 0.166 ± 0.011 μGal/mm,对应的上地幔密度约为 3402 ± 95 kg/m3。本说明包括截至 2017 年 6 月的额外 GRACE 数据和 2018 年 6 月至 2023 年 11 月的 GRACE 后续数据。所有数据的加权最小二乘法求解结果为\(\dot{g}/\dot{h}\) = - 0.160 ± 0.011 μGal/mm,得出上地幔密度约为 3546 ± 71 kg/m3。这些结果表明了卫星重力测量数据在冰川等静力调整(GIA)建模和陆地隆升速率等其他参数中的重要性。利用时间跨度更长的 GRACE 和 GRACE 后续数据,我们可以更精确地捕捉重力高度比的细微变化和趋势。这将有助于制约和调整重力-高度比模型并完善重力观测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A short note on GIA related surface gravity versus height changes in Fennoscandia

Vertical land motion and the redistribution of masses within and on the surface of the Earth affect the Earth’s gravity field. Hence, studying the ratio between temporal changes of the surface gravity \(\left( {\dot{g}} \right)\) and height (\(\dot{h}\)) is important in geoscience, e.g., for reduction of gravity observations, assessing satellite gravimetry missions, and tuning vertical land motion models. Sjöberg and Bagherbandi (2020) estimated a combined ratio of \(\dot{g}/\dot{h}\) in Fennoscandia based on relative gravity observations along the 63 degree gravity line running from Vågstranda in Norway to Joensuu in Finland, 688 absolute gravity observations observed at 59 stations over Fennoscandia, monthly gravity data derived from the GRACE satellite mission between January 2003 and August 2016, as well as a land uplift model. The weighted least-squares solution of all these data was \(\dot{g}/\dot{h}\) = − 0.166 ± 0.011 μGal/mm, which corresponds to an upper mantle density of about 3402 ± 95 kg/m3. The present note includes additional GRACE data to June 2017 and GRACE Follow-on data from June 2018 to November 2023. The resulting weighted least-squares solution for all data is \(\dot{g}/\dot{h}\) = − 0.160 ± 0.011 μGal/mm, yielding an upper mantle density of about 3546 ± 71 kg/m3. The outcomes show the importance of satellite gravimetry data in Glacial Isostatic Adjustment (GIA) modeling and other parameters such as land uplift rate. Utilizing a longer time span of GRACE and GRACE Follow-on data allows us to capture fine variations and trends in the gravity-to-height ratio with better precision. This will be useful for constraining and adjusting GIA models and refining gravity observations.

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来源期刊
Journal of Geodesy
Journal of Geodesy 地学-地球化学与地球物理
CiteScore
8.60
自引率
9.10%
发文量
85
审稿时长
9 months
期刊介绍: The Journal of Geodesy is an international journal concerned with the study of scientific problems of geodesy and related interdisciplinary sciences. Peer-reviewed papers are published on theoretical or modeling studies, and on results of experiments and interpretations. Besides original research papers, the journal includes commissioned review papers on topical subjects and special issues arising from chosen scientific symposia or workshops. The journal covers the whole range of geodetic science and reports on theoretical and applied studies in research areas such as: -Positioning -Reference frame -Geodetic networks -Modeling and quality control -Space geodesy -Remote sensing -Gravity fields -Geodynamics
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