地表负载对非洲全球导航卫星系统台站的影响

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Saturday E. Usifoh, Nhung Le, Benjamin Männel, Pierre Sakic, Joseph Dodo, Harald Schuh
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引用次数: 0

摘要

地球表面物质的运动,包括大气和海洋以及水文和冰川融化,造成了地表负荷的重新分配、固体地球的变形和重力场的波动。全球导航卫星系统(GNSS)提供了有关地球表面物质运动的有用信息。利用垂直高度时间序列分析,对非洲 145 个全球导航卫星系统站点的地表负载变形的影响进行了研究。该研究利用全球导航卫星系统精确点定位(PPP)方法,调查并量化了地表载荷对全球导航卫星系统坐标的影响。使用德国地球科学研究中心(GFZ)的 EPOS.P8 软件处理和分析了来自所有站点的十一年全球定位系统数据,以及德国地球科学研究中心(ESMGFZ)地球系统建模小组提供的专用水文和大气负荷校正模型。对地表变形引起的水文负荷修正结果进行了分析,以确定站点改进的程度。结果显示,约 40% 的测站得到了改善,在应用水文载荷修正之前,平均残差均方根误差 (RMSE) 为 7.3 毫米,应用水文载荷修正之后,平均残差均方根误差 (RMSE) 为 7.1 毫米。同样,大气负荷校正也改善了约 57%。此外,经过大气负荷修正后,振幅值从 4.1-8.1 毫米降至 3.5-6.2 毫米。这一发现预示着,对得出的时间序列进行负荷校正会降低某些非洲地区的振幅。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The Impact of Surface Loading on GNSS Stations in Africa

The Impact of Surface Loading on GNSS Stations in Africa

The movement of the Earth's surface mass, including the atmosphere and oceans, as well as hydrology and glacier melting, causes the redistribution of surface loads, deformation of the solid Earth, and fluctuations in the gravity field. Global Navigation Satellite Systems (GNSS) provide useful information about the movement of the Earth's surface mass. The impact of surface loading deformation over 145 GNSS sites in Africa was investigated using vertical height time series analysis. The study investigates and quantifies the impact of surface loading on the GNSS coordinates utilizing GNSS Precise Point Positioning (PPP) approach. The German Research Center for Geosciences (GFZ) EPOS.P8 software was used to process and analyze eleven years of GPS data from all the stations, as well as dedicated hydrological and atmospheric loading correction models given by the Earth System Modeling group at Deutsches GeoForschungsZentrum (ESMGFZ). The results of the hydrological loading corrections arising from the surface-deformation were analysed to determine the extent of station improvements. The results revealed about 40% of the stations showed improvement with an average Root Mean Square Error (RMSE) residual of 7.3 mm before the application of the hydrological loading corrections and 7.1 mm Root Mean Square Error (RMSE) after the application of the hydrological loading corrections. Similarly, the atmospheric loading corrections gave an improvement of about 57%. Furthermore, the amplitude values decreased from 4.1–8.1 mm to 3.5–6.2 mm after atmospheric loading corrections. This finding presupposes that applying loading corrections to the derived time series reduces amplitude in some African regions.

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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
期刊介绍: pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.
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