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Lookup NU author(s): Professor Matt King, Dr Achraf Koulali IdrissiORCiD, Professor Peter ClarkeORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© Author(s) 2025. For nearly 3 decades, geodetic Global Navigation Satellite System (GNSS) measurements in Antarctica have provided direct observations of bedrock displacement, which is linked to various geodynamic processes, including plate motion, post-seismic deformation, and glacial isostatic adjustment (GIA). Previous geodynamic studies in Antarctica, especially those pertaining to GIA, have been constrained by the limited availability of GNSS data. This is due to the fact that GNSS data are collected by a wide range of institutions and network operators, with the raw observational data either not publicly available or scattered across various repositories. Further, the metadata necessary for rigorous data processing have often not been available or reliable. Consequently, the potential of GNSS observations for geodynamic studies in Antarctica has not been fully exploited yet. Here, we present consistently processed coordinate time series for GNSS sites in Antarctica and the sub-Antarctic region for the time span from 1995 to 2021. The data set is composed of 286 continuous and episodic sites, with 258 sites having a time span longer than 3 years. The coordinate time series were obtained from a combination of four independent processing solutions using different GNSS software and products, allowing the identification of inconsistencies in individual solutions. From these, we infer a reliable and robust combined solution. A key issue was the thorough reassessment of station metadata to minimise artefacts and biases in the coordinate time series. The resulting data set provides coordinate time series with unprecedented spatiotemporal coverage, promising significant advancements in future geodynamic studies in Antarctica. The data set is freely available at https://doi.org/10.1594/PANGAEA.967515 (Buchta et al., 2024a).
Author(s): Buchta E, Scheinert M, King MA, Wilson T, Koulali A, Clarke PJ, Gomez D, Kendrick E, Knofel C, Busch P
Publication type: Article
Publication status: Published
Journal: Earth System Science Data
Year: 2025
Volume: 17
Issue: 5
Pages: 1761-1780
Online publication date: 06/05/2025
Acceptance date: 30/01/2025
Date deposited: 19/05/2025
ISSN (print): 1866-3508
ISSN (electronic): 1866-3516
Publisher: Copernicus Publications
URL: https://doi.org/10.5194/essd-17-1761-2025
DOI: 10.5194/essd-17-1761-2025
Data Access Statement: The product inferred by this project is available at the PANGAEA repository (https://doi.org/10.1594/PANGAEA.967515, Buchta et al., 2024a) as a data set collection and comprises four individual data sets: the combined coordinate time series (https://doi.org/10.1594/PANGAEA.967516, Buchta et al., 2024b); the time series of the tropospheric zenith total delay (ZTD) from the individual AC processing results (https://doi.org/10.1594/PANGAEA.967529, Buchta et al., 2024e); the station information in the form of IGS log files (https://doi.org/10.1594/PANGAEA.967532, Buchta et al., 2024d); and a list of events (https://doi.org/10.1594/PANGAEA.967533 Buchta et al., 2024c), which can be employed in conjunction with the coordinate time series data to analyse the coordinate trajectory. The data sources of publicly available observational data are listed in Table S1 in the Supplement.
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