Resolution evaluation of the satellite altimetric gravity anomaly models with shipborne gravity data over the Cosmonaut Sea, East Antarctica (44–52° E)

IF 1.8 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Chunguo Yang, Linjiang Qin, Weifeng Ding, Jinyao Gao, Guochao Wu
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Abstract

Several satellite gravity anomaly models are freely available to calculate the free-air gravity anomaly in areas where shipborne gravity measurements are scarce. Two models produced by the Technical University of Denmark (DTU17) and the Scripps Institution of Oceanography (SIOv32.1), respectively, were selected to compute the free-air anomalies over the Cosmonaut Sea, East Antarctica. A statistical comparison analysis was performed to evaluate the resolution of satellite gravity anomaly models by comparing them with the shipborne surveying date. The radially averaged energy spectra of free-air anomaly from different sources were calculated and compared over two selected regions to further evaluate the reliability of the data derived from satellite gravity anomaly models. The satellite gravity anomaly models have a better resolution in the ocean basin than in the area near the continental shelf. The comparison analysis revealed that the precision of both DTU17 and SIOv32.1 is close to the shipborne gravity data, but on average, SIOv32.1 is a little bit better than DTU17. The spectral analysis showed that the shipborne measurements may provide higher resolution than the satellite gravity anomaly model at wavelengths shorter than 20 km, and the free-air data derived from SIOv32.1 have better resolution than the one from DTU17. These shipborne datasets will provide contributions for the updates of the Antarctic gravity anomaly and enable new high-resolution combined Earth gravity models to be derived in Antarctica.

利用南极洲东部宇宙海(东经 44-52°) 上的船载重力数据对卫星测高重力异常模型进行分辨率评估
在缺乏船载重力测量的地区,有几种卫星重力异常模型可免费用于计算自由空气重力异常。我们选择了分别由丹麦技术大学(DTU17)和斯克里普斯海洋学研究所(SIOv32.1)制作的两个模型来计算南极洲东部宇宙海的自由空气异常。通过与船载勘测日期进行比较,对卫星重力异常模型的分辨率进行了统计比较分析。计算并比较了两个选定区域内不同来源的自由空气异常的径向平均能量谱,以进一步评估卫星重力异常模型得出的数据的可靠性。卫星重力异常模型在海盆中的分辨率高于大陆架附近区域。对比分析表明,DTU17 和 SIOv32.1 的精度与船载重力数据接近,但平均而言,SIOv32.1 略好于 DTU17。光谱分析显示,在波长短于 20 千米处,船载测量数据可能比卫星重力异常模型提供更高的分辨率,而 SIOv32.1 导出的自由空气数据比 DTU17 的分辨率更高。这些船载数据集将为更新南极重力异常做出贡献,并能在南极推导出新的高分辨率地球重力综合模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geophysical Prospecting
Geophysical Prospecting 地学-地球化学与地球物理
CiteScore
4.90
自引率
11.50%
发文量
118
审稿时长
4.5 months
期刊介绍: Geophysical Prospecting publishes the best in primary research on the science of geophysics as it applies to the exploration, evaluation and extraction of earth resources. Drawing heavily on contributions from researchers in the oil and mineral exploration industries, the journal has a very practical slant. Although the journal provides a valuable forum for communication among workers in these fields, it is also ideally suited to researchers in academic geophysics.
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