Can GPS and GRACE data be used to separate past and present-day surface loading in a data-driven approach?

Author:

Ziegler Yann1,Vishwakarma Bramha Dutt12ORCID,Brady Aoibheann13ORCID,Chuter Stephen1,Royston Sam1,Westaway Richard M1,Bamber Jonathan L14

Affiliation:

1. Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol , University Road, BS81SS Bristol, United Kingdom

2. Interdisciplinary Centre for Water Research, Indian Institute of Science , Bengaluru, Karnataka 560012, India

3. Centre for Earth Sciences, Indian Institute of Science , Bengaluru, Karnataka 560012, India

4. Department of Aerospace and Geodesy, Data Science in Earth Observation, Technical University of Munich , 80333 München, Germany

Abstract

SUMMARY Glacial isostatic adjustment (GIA) and the hydrological cycle are both associated with mass changes and vertical land motion (VLM), which are observed by GRACE and GPS, respectively. Hydrology-related VLM results from the instantaneous response of the elastic solid Earth to surface loading by freshwater, whereas GIA-related VLM reveals the long-term response of the viscoelastic Earth mantle to past ice loading history. Thus, observations of mass changes and VLM are interrelated, making GIA and hydrology difficult to quantify and study independently. In this work, we investigate the feasibility of separating these processes based on GRACE and GPS observations, in a fully data-driven and physically consistent approach. We take advantage of the differences in the spatio-temporal characteristics of the GIA and hydrology fields to estimate the respective contributions of each component using a Bayesian hierarchical modelling framework. A closed-loop synthetic test confirms that our method successfully solves this source separation problem. However, there are significant challenges when applying the same approach with actual observations and the answer to the main question of this study is more nuanced. In particular, in regions where GPS station coverage is sparse, the lack of informative data becomes a limiting factor.

Funder

European Research Council

Leverhulme Trust

Royal Society

Marie Skłodowska-Curie

Publisher

Oxford University Press (OUP)

Subject

Geochemistry and Petrology,Geophysics

Cited by 3 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Sensitivity of GNSS‐Derived Estimates of Terrestrial Water Storage to Assumed Earth Structure;Journal of Geophysical Research: Solid Earth;2024-03

2. GNSS and the cryosphere;GNSS Monitoring of the Terrestrial Environment;2024

3. Signal Separation in Global, Temporal Gravity Data;Proceedings of the 6th ACM SIGSPATIAL International Workshop on AI for Geographic Knowledge Discovery;2023-11-13

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