Elizabeth J. Petrie

Elizabeth J. Petrie
University of Glasgow | UofG · School of Geographical and Earth Sciences

BA, MSci, MSc, PhD

About

19
Publications
7,425
Reads
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671
Citations
Additional affiliations
May 2010 - August 2014
Newcastle University
Position
  • Research Associate
Education
October 2006 - July 2010
Newcastle University
Field of study
  • Satellite Geodesy
October 2004 - September 2005
University College London
Field of study
  • Hydrographic Surveying
October 1996 - June 2000
University of Cambridge
Field of study
  • Natural Sciences

Publications

Publications (19)
Poster
Full-text available
Global navigation satellite systems (GNSS) are used to monitor land motion. To reach accuracies desired for the Global Geodetic Observing System, measurement capability needs to improve further. 3-D documentation of the GNSS site could help in developing an understanding of how the varying conditions at the site affect the position estimate. Change...
Article
Full-text available
The poorly known correction for the ongoing deformation of the solid Earth caused by glacial isostatic adjustment (GIA) is a major uncertainty in determining the mass balance of the Antarctic ice sheet from measurements of satellite gravimetry and to a lesser extent satellite altimetry. In the past decade, much progress has been made in consistentl...
Preprint
Full-text available
Changes in J2, resulting from past and present changes in Earth’s climate, are traditionally observed by Satellite Laser ranging (SLR). Assuming an elastic Earth, it is possible to infer changes in J2 from changes in Earth’s shape observed by GPS. We compare estimates of non-secular J2 changes from GPS, SLR, GRACE and a load model. The GPS and SLR...
Article
Full-text available
A major uncertainty in determining the mass balance of the Antarctic ice sheet from measurements of satellite gravimetry, and to a lesser extent satellite altimetry, is the poorly known correction for the ongoing deformation of the solid Earth caused by glacial isostatic adjustment (GIA). In the past decade, much progress has been made in consisten...
Article
A major uncertainty in determining the mass balance of the Antarctic ice sheet from measurements of satellite gravimetry, and to a lesser extent satellite altimetry, is the poorly known correction for the ongoing deformation of the solid Earth caused by glacial isostatic adjustment (GIA). Although much progress has been made in consistently modelin...
Article
Full-text available
Understanding the effects of glacial isostatic adjustment (GIA) of the British Isles is essential for the assessment of past and future sea-level trends. GIA has been extensively examined in the literature, employing different research methods and observational data types. Geological evidence from palaeo-shorelines and undisturbed sedimentary depos...
Article
Full-text available
We present spatio-temporal mass balance trends for the Antarctic Ice Sheet from a statistical inversion of satellite altimetry, gravimetry, and elastic-corrected GPS data for the period 2003–2013. Our method simultaneously determines annual trends in ice dynamics, surface mass balance anomalies, and a time invariant solution for glacio-isostatic ad...
Article
Full-text available
The accuracy of Global Positioning System (GPS) time series is degraded by the presence of offsets. To assess the effectiveness of methods that detect and remove these offsets, we designed and managed the Detection of Offsets in GPS Experiment. We simulated time series that mimicked realistic GPS data consisting of a velocity component, offsets, wh...
Presentation
Non-gravitational forces such as solar radiation pressure, earth radiation pressure, antenna thrust and thermal re-radiation are relatively small contributors to the overall GPS satellite orbital force budget. However, if neglected, these small non-gravitationally induced accelerations produce significant errors in satellite positions and velocitie...
Article
Full-text available
Higher order ionospheric effects are increasingly relevant as precision requirements on GPS data and products increase. The refractive index of the ionosphere is affected by its electron content and the magnetic field of the Earth, so the carrier phase of the GPS L1 and L2 signals is advanced and the modulated code delayed. Due to system design the...
Presentation
Higher order ionospheric effects arise both from the expansion of the refractive index of the ionosphere as a series and from signal bending due to gradients in refractive index. There is an approximately eleven year variation in the electron content of the ionosphere due to the solar cycle. This means that systematic errors with a trend over sever...
Article
Full-text available
Changes in J2, resulting from past and present changes in Earth's climate, are traditionally observed by Satellite Laser ranging (SLR). Assuming an elastic Earth, it is possible to infer changes in J2 from changes in Earth's shape observed by GPS. We compare estimates of non-secular J2 changes from GPS, SLR, GRACE, and a load model. The GPS and SLR...
Article
Full-text available
This study provides a first attempt at quantifying potential signal bending effects on the GPS reference frame, coordinates and zenith tropospheric delays (ZTDs). To do this, we homogeneously reanalysed data from a global network of GPS sites spanning 14years (1995.0–2009.0). Satellite, Earth orientation, tropospheric and ground station coordinate...
Article
Full-text available
1] We describe how GPS time series are influenced by higher‐order ionospheric effects over the last solar cycle (1995–2008) and examine implications for geophysical studies. Using 14 years of globally reprocessed solutions, we demonstrate the effect on the reference frame. Including second‐ and third‐order ionospheric terms causes up to 10 mm diffe...
Poster
Full-text available
It is ten years since the IERS Campaign to investigate motion of the geocenter. One conclusion from that campaign was ”It appears that even if Space Geodesy geocenter estimates are sensitive to seasonal variations, the determinations are not yet accurate and reliable enough to adopt an empirical model that would represent a real signal”. So where a...

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