利用新型平台海洋重力仪提供的船载重力数据对测高海洋重力模型进行多维评估

IF 2.7 3区 地球科学 Q1 ENGINEERING, MARINE Journal of Marine Science and Engineering Pub Date : 2024-08-03 DOI:10.3390/jmse12081314
Bo Wang, Lin Wu, Pengfei Wu, Qianqian Li, Lifeng Bao, Yong Wang
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引用次数: 0

摘要

过去几十年来,随着卫星测高技术的发展和新型测高卫星的应用,测高仪衍生重力场模型的精度和分辨率都有所提高。如今,它们已经接近船载重力测量。本文采集了南海多源船载重力数据,以评估两个高精度高度计衍生海洋重力场模型(SS V30.1、DTU17)的精度。在这些船载重力数据中,有从国家地球物理数据中心(NGDC)获得的数十条航线的船舶重力测量数据;有使用商用海洋重力仪(KSS31M 型)进行的海洋调查跟踪数据,以及 2020 年 9 月在南海使用新开发的平台重力仪(JMG 型)进行的海洋重力测量活动跟踪数据。经过各种数据过滤、处理和校准后,通过交叉点分析对船载重力数据进行了验证。然后,利用处理后的船载数据评估高度计衍生海洋重力场模型的精度。在此过程中,JMG 船载重力数据的质量与 KSS31M 和 NGDC 数据的结果进行了比较。分析和评估结果表明,KSS31M 和 JMG 的交叉点验证精度分别为 0.70 mGal 和 1.61 mGal,远高于 NGDC 大于 8.0 mGal 的精度;在水深变化较慢的区域,测高重力模型与 KSS31M 数据的均方根误差值分别为 3.28 mGal 和 4.54 mGal。根据上述结果,我们可以得出结论:JMG 与 KSS31M 具有相同的 1-2 mGal 的精度水平,可以满足海洋重力的测量要求。
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Multidimensional Evaluation of Altimetry Marine Gravity Models with Shipborne Gravity Data from a New Platform Marine Gravimeter
With the development of satellite altimetry technology and the application of new altimetry satellites, the accuracy and resolution of altimeter-derived gravity field models have improved over the last decades. Nowadays, they are close enough to shipborne gravimetry. In this paper, multi-source shipborne gravity data in the South China Sea were taken to evaluate the accuracies of two high-precision altimeter-derived marine gravity field models (SS V30.1, DTU17). In these shipborne gravity data, there are dozens of routes’ ship gravimetry data, obtained from the National Geophysical Data Center (NGDC); data were tracked from a marine survey with a commercial marine gravimeter (type KSS31M), and data were tracked from a marine gravimetry campaign that was conducted with a newly developed platform gravimeter (type JMG) in the South China Sea in September 2020. After various data filtering, processing, and calibrations, the shipborne gravity data were validated with crossover points analysis. Then, the processed shipborne data were employed to evaluate the accuracy of the altimeter-derived marine gravity field models. During this procedure, the quality of JMG shipborne gravity data was compared with the results of KSS31M and NGDC data. Analysis and evaluation results show that the crossover points verification accuracies of KSS31M and JMG are 0.70 mGal and 1.61 mGal, which are much better than the accuracy of NGDC, which is larger than 8.0 mGal. In the area where the bathymetry changes slowly, the root mean square error values between altimetry gravity models and KSS31M data are respectively 3.28 mGal and 4.54 mGal, and those of the JMG data are respectively 2.94 mGal and 2.60 mGal. According to the above results, we can conclude that the JMG has the same 1–2 mGal accuracy level as KSS31M and can meet the measurement requirements of marine gravity.
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来源期刊
Journal of Marine Science and Engineering
Journal of Marine Science and Engineering Engineering-Ocean Engineering
CiteScore
4.40
自引率
20.70%
发文量
1640
审稿时长
18.09 days
期刊介绍: Journal of Marine Science and Engineering (JMSE; ISSN 2077-1312) is an international, peer-reviewed open access journal which provides an advanced forum for studies related to marine science and engineering. It publishes reviews, research papers and communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation or experimental procedure, if unable to be published in a normal way, can be deposited as supplementary electronic material.
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