Mitigating the effects of vertical land motion in tide gauge records using a state-of-the-art GPS velocity field

Santamaría-Gómez, Álvaro; Gravelle, Médéric; Collilieux, Xavier; Guichard, M.; Míguez, Belén Martín; Tiphaneau, Pascal; Wöppelmann, Guy

doi:10.1016/j.gloplacha.2012.07.007

Cited by 132 publications

(120 citation statements)

References 75 publications

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“…Although much has been done to combine the information from tide-gauge and GPS measurements (Santamaría-Gómez et al 2012; http://www.sonel.org/), however GPS@TG still do not cover all tide-gauge sites, either at a global or regional scale (e.g. the Mediterranean Sea).…”

Section: Tide Gauge Datamentioning

confidence: 99%

Sea-level variability in the Mediterranean Sea from altimetry and tide gauges

et al. 2016

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mean sea-level and the coastal stations. From 1993 to 2012, the mean sea-level trend (2.44 ± 0.5 mm year −1 ) was found to be affected by the positive anomalies of 2010 and 2011, which were observed in all the cases analysed and were mainly distributed in the eastern part of the basin. Ensemble empirical mode decomposition showed that these events were related to the processes that have dominant periodicities of ∼10 years, and positive residual sea-level trend were generally observed in both data-sets. In terms of mean sea-level trends, a significant positive sea-level trend (>95 %) in the Mediterranean Sea was found on the basis of at least 15 years of data.

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Section: Tide Gauge Datamentioning

confidence: 99%

Sea-level variability in the Mediterranean Sea from altimetry and tide gauges

et al. 2016

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“…Collilieux and W€ oppelmann, 2011;Bevis et al, 2013;Bevis and Brown, 2014], the epochs of CGPS data analyzed, and the color of noise used in the trend estimates. Examples of GPS-derived VLM at PERT are: 25.21 6 0.73 mm/yr (January 1997 to November 2006 in ITRF2005) [Bouin and W€ oppelmann, 2010], 26.30 6 0.05 mm/yr (4 January 1998 to 29 December 2007 in IGS05 RF) [Rudenko et al, 2013], 22.98 6 0.34 mm/yr (15.98 years but epoch not specified in IGS08 RF) [Santamarıa-Gomez et al, 2012], and 22.1 6 0.7 mm/yr (beyond 2000, but no end date specified or RF) [Burgette et al, 2013]. In addition, the studies above have only considered linear VLM; we will demonstrate that VLM in the Perth Basin is nonlinear.…”

Section: The Fremantle Tg and Previous Vlm Estimatesmentioning

confidence: 99%

Nonlinear subsidence at Fremantle, a long‐recording tide gauge in the Southern Hemisphere

et al. 2015

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A combination of independent evidence (continuous GPS, repeat geodetic leveling, groundwater abstraction, satellite altimetry, and tide gauge (TG) records) shows that the long‐recording Fremantle TG has been subsiding in a nonlinear way since the mid‐1970s due to time‐variable groundwater abstraction. The vertical land motion (VLM) rates vary from approximately −2 to −4 mm/yr (i.e., subsidence), thus producing a small apparent acceleration in mean sea level computed from the Fremantle TG records. We exemplify that GPS‐derived VLM must be geodetically connected to the TG to eliminate the commonly used assumption that there is no differential VLM when the GPS is not colocated with the TG. In the Perth Basin, we show that groundwater abstraction can be used as a diagnostic tool for identifying nonlinear VLM that is not evident in GPS time series alone.

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“…The GPS data processing includes the most up-to-date models and corrections compliant with the second IGS reprocessing campaign specifications. The station mean coordinates and velocities, aligned to the ITRF2008, were estimated following the same procedure described in Santamaría-Gómez et al (2012).…”

Section: E Va L Uat I O N O F T H E D O R I S V E Rt I C a L V E L O mentioning

confidence: 99%

“…In Section 4, we compare the obtained horizontal velocities of the DORIS sites with those expected from two recent global plate models: NNR-MORVEL56 (Argus et al 2011) and GEODVEL , and we discuss five sites (Arequipa, Dionysos/Gavdos, Manila and Santiago) with velocities differing significantly from at least one of the two plate models by comparing with observations from relevant GPS stations. Section 5 deals with the validation of the vertical velocities from the DORIS cumulative solution with respect to vertical motions derived from the GPS ULR solution, updated from Santamaría-Gómez et al (2012). Sites which show larger differences in vertical velocities (Thule and Ny-Ålesund) are of special concern.…”

Section: Introductionmentioning

confidence: 99%

Horizontal and vertical velocities derived from the IDS contribution to ITRF2014, and comparisons with geophysical models

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Lemoine

Argus

et al. 2016

Geophys. J. Int.

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S U M M A R YIn the context of the 2014 realization of the International Terrestrial Reference Frame, the International DORIS (Doppler Orbitography Radiopositioning Integrated by Satellite) Service (IDS) has delivered to the IERS a set of 1140 weekly SINEX files including station coordinates and Earth orientation parameters, covering the time period from 1993.0 to 2015.0. From this set of weekly SINEX files, the IDS combination centre estimated a cumulative DORIS position and velocity solution to obtain mean horizontal and vertical motion of 160 stations at 71 DORIS sites. The main objective of this study is to validate the velocities of the DORIS sites by comparison with external models or time-series. Horizontal velocities are compared with two recent global plate models (GEODVEL 2010 and NNR-MORVEL56). Prior to the comparisons, DORIS horizontal velocities were corrected for Global Isostatic Adjustment from the ICE-6G (VM5a) model. For more than half of the sites, the DORIS horizontal velocities differ from the global plate models by less than 2-3 mm yr −1 . For five of the sites (Arequipa, Dionysos/Gavdos, Manila and Santiago) with horizontal velocity differences with respect to these models larger than 10 mm yr −1 , comparisons with GNSS estimates show the veracity of the DORIS motions. Vertical motions from the DORIS cumulative solution are compared with the vertical velocities derived from the latest GPS cumulative solution over the time span 1995.0-2014.0 from the University of La Rochelle solution at 31 co-located DORIS-GPS sites. These two sets of vertical velocities show a correlation coefficient of 0.83. Vertical differences are larger than 2 mm yr −1 at 23 percent of the sites. At Thule, the disagreement is explained by fine-tuned DORIS discontinuities in line with the mass variations of outlet glaciers. Furthermore, the time evolution of the vertical time-series from the DORIS station in Thule show similar trends to the GRACE equivalent water height.

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Mitigating the effects of vertical land motion in tide gauge records using a state-of-the-art GPS velocity field

Cited by 132 publications

References 75 publications

Sea-level variability in the Mediterranean Sea from altimetry and tide gauges

Sea-level variability in the Mediterranean Sea from altimetry and tide gauges

Nonlinear subsidence at Fremantle, a long‐recording tide gauge in the Southern Hemisphere

Horizontal and vertical velocities derived from the IDS contribution to ITRF2014, and comparisons with geophysical models

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