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Toward a Global Horizontal and Vertical Elastic Load Deformation Model Derived from GRACE and GNSS Station Position Time Series

Chanard, Kristel and Fleitout, Luce and Calais, Eric and Rebischung, Paul and Avouac, Jean-Philippe (2018) Toward a Global Horizontal and Vertical Elastic Load Deformation Model Derived from GRACE and GNSS Station Position Time Series. Journal of Geophysical Research. Solid Earth, 123 (4). pp. 3225-3237. ISSN 2169-9313. https://resolver.caltech.edu/CaltechAUTHORS:20180620-104204252

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Abstract

We model surface displacements induced by variations in continental water, atmospheric pressure, and nontidal oceanic loading, derived from the Gravity Recovery and Climate Experiment (GRACE) for spherical harmonic degrees two and higher. As they are not observable by GRACE, we use at first the degree‐1 spherical harmonic coefficients from Swenson et al. (2008, https://doi.org/10.1029/2007JB005338). We compare the predicted displacements with the position time series of 689 globally distributed continuous Global Navigation Satellite System (GNSS) stations. While GNSS vertical displacements are well explained by the model at a global scale, horizontal displacements are systematically underpredicted and out of phase with GNSS station position time series. We then reestimate the degree 1 deformation field from a comparison between our GRACE‐derived model, with no a priori degree 1 loads, and the GNSS observations. We show that this approach reconciles GRACE‐derived loading displacements and GNSS station position time series at a global scale, particularly in the horizontal components. Assuming that they reflect surface loading deformation only, our degree‐1 estimates can be translated into geocenter motion time series. We also address and assess the impact of systematic errors in GNSS station position time series at the Global Positioning System (GPS) draconitic period and its harmonics on the comparison between GNSS and GRACE‐derived annual displacements. Our results confirm that surface mass redistributions observed by GRACE, combined with an elastic spherical and layered Earth model, can be used to provide first‐order corrections for loading deformation observed in both horizontal and vertical components of GNSS station position time series.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1002/2017JB015245DOIArticle
ORCID:
AuthorORCID
Chanard, Kristel0000-0001-9934-9621
Fleitout, Luce0000-0003-1114-3616
Calais, Eric0000-0002-5935-8117
Avouac, Jean-Philippe0000-0002-3060-8442
Additional Information:© 2018 American Geophysical Union. Received 16 NOV 2017; Accepted 16 FEB 2018; Accepted article online 21 FEB 2018; Published online 18 APR 2018. This work takes advantage of GRACE data processed by the CNES/GRGS (http://grgs.obsmip.fr/) and the IGS data (Dow et al., 2009). The project was funded by NSF grant EAR 1345136, the Laboratoire de Recherche Commun “Yves Rocard” (ENS‐CEA‐CNRS), and CNRS/TOSCA grant 2925.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR-1345136
Laboratoire de Recherche CommunUNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)2925
Subject Keywords:GNSS; GRACE; Lloading; degree 1; horizontal; vertical
Issue or Number:4
Record Number:CaltechAUTHORS:20180620-104204252
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180620-104204252
Official Citation:Chanard, K., Fleitout, L., Calais, E., Rebischung, P., & Avouac, J.‐P. (2018). Toward a global horizontal and vertical elastic load deformation model derived from GRACE and GNSS station position time series. Journal of Geophysical Research: Solid Earth, 123, 3225–3237. https://doi.org/10.1002/2017JB015245
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87258
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:20 Jun 2018 18:54
Last Modified:03 Oct 2019 19:54

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