Vertical Motion Determined Using Satellite Altimetry and Tide Gauges

Kuo, Chung Yen; Shum, C. K.; Braun, Alexander; Cheng, Kai Chien; Yi, Yuchan

doi:10.3319/tao.2008.19.1-2.21(sa)

Cited by 47 publications

(55 citation statements)

References 21 publications

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“…The estimated vertical land motion is primarily attributed to GIA because of the well-known incomplete glacial isostatic rebound of the mantle as a result of the Laurentide Ice Sheet deglaciation since the Last Glacial Maximum, 18000 -20000 years before present. The estimated TOPEX land uplift rates agree well with the combined TOPEX/PO-SEIDON and tide gauge measurements (Kuo et al 2008) and the GPS vertical velocities (Snay et al 2007;Calais et al 2006). The results further agree well with various GIA models.…”

Section: Discussionsupporting

confidence: 76%

“…The result qualitatively agrees with computed uplifts using various GIA models, which predict that the maximum uplift occurs around the Hudson Bay and minimum or subsidence near or south of the so-called transition zone which is located around Lake Erie and the southern Lake Michigan. Figure 4 shows the uplift rates from other techniques including the estimated vertical motions at water level gauges around the Great Lakes by combining TOPEX/ POSEIDON altimetry and long-term water level gauge records (Kuo et al 2008), and the GPS vertical velocities from National Geodetic Survey (NGS) solution (Snay et al 2007; R. Snay and M. Cline, personal communication, 2006). Another two GPS solutions at Churchill and Kuuj (Calais et al 2006) are included to show the qualitative agreement between the GPS velocities and the nearby TOPEX altimetry observed land uplift rates.…”

Section: Lsh a B DX C Dymentioning

confidence: 99%

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Application of TOPEX Altimetry for Solid Earth Deformation Studies

Lee¹,

Shum²,

Kuo³

et al. 2008

Terr. Atmos. Ocean. Sci.

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This study demonstrates the use of satellite radar altimetry to detect solid Earth deformation signals such as Glacial Isostatic Adjustment (GIA). Our study region covers moderately flat land surfaces seasonally covered by snow/ice/vegetation. The maximum solid Earth uplift of ~10 mm yr -1 is primarily due to the incomplete glacial isostatic rebound that occurs around Hudson Bay, North America. We use decadal (1992 -2002) surface height measurements from TOPEX/POSEIDON radar altimetry to generate height changes time series for 12 selected locations in the study region. Due to the seasonally varying surface characteristics, we first perform radar waveform shape classification and have found that most of the waveforms are quasi-diffuse during winter/spring and specular during summer/fall. As a result, we used the NASA β-retracker for the quasidiffuse waveforms and the Offset Center of Gravity or the threshold retracker for the specular waveforms, to generate the surface height time series. The TOPEX height change time series exhibit coherent seasonal signals (higher amplitude during the winter and lower amplitude during the summer), and the estimated deformation rates agree qualitatively well with GPS vertical velocities, and with altimeter/tide gauge combined vertical velocities around the Great Lakes. The TOPEX observations also agree well with various GIA model predictions, especially with the ICE-5G (VM2) model with differences at 0.2 ± 1.4 mm yr -1 , indicating that TOPEX has indeed observed solid Earth deformation signals manifested as crustal uplift over the former Laurentide Ice Sheet region.

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Section: Discussionsupporting

confidence: 76%

Section: Lsh a B DX C Dymentioning

confidence: 99%

Application of TOPEX Altimetry for Solid Earth Deformation Studies

Lee¹,

Shum²,

Kuo³

et al. 2008

Terr. Atmos. Ocean. Sci.

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“…The lateral viscosity variation of this model, RF3L20(β=0.4)+ICE-4G, is inferred from shear-wave velocity anomalies of the seismic tomographic model S20A (Ekstrom and Dziewonski, 1998) using the scaling relationship of Ivins and Sammis (1995) multiplied by the factor β. The latter represents the fractional contribution of temperature variations to lateral variation in shear-wave velocity, and is constrained to be 0.4 by historic relative sea-level data (Tushingham and Peltier, 1991), GPS observations in Laurentide (Sella et al, 2007) and Fennoscandia (Lidberg et al, 2007), altimetry and tide-gauge data in the Great Lakes area (Kuo et al, 2008) and GRACE data in Laurentide . The ice load is given by Peltier's (1994) ICE-4G model.…”

Section: Introductionmentioning

confidence: 99%

The role of glacial isostatic adjustment in the present-day crustal motion and sea levels of East Asia

Wang

Jia

et al. 2011

Earth Planet Sp

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The aim of this paper is to model and remove the contribution of glacial isostatic adjustment (GIA) from the observed crustal velocities and sea-level rates in East Asia, so that the signal from other geological processes such as tectonic uplift or global change can be better revealed. State-of-the-art GIA models that include 3D variations in mantle viscosity and lithospheric thickness are employed in this study. Uncertainties of the GIA response are estimated from different ice history and background viscosity models. It is demonstrated that the uncertainties in the GIA response in East Asia are generally small compared with the response itself. For example, the land uplift rate near the east coast of China due to GIA has magnitudes of about 0.1 mm/yr while the uncertainties are generally less than 0.04 mm/yr. These are small compared with the observed magnitude of uplift rate (∼1.0 mm/yr) and the measurement uncertainties of GPS. For the height rates in leveling observation, relative sea-level rates in tide gauge data, absolute seal-level rates from satellite altimetry and tangential velocities from GPS data, the GIA effects are also shown to be generally small compared with observed data. This technique of "cleaning" geodetic data will become more useful in the future when the uncertainties of geodetic measurements can be reduced to less than 0.1 mm/yr.

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“…It is a physical phenomenon that the solid Earth is exhibiting a viscoelastic rebound and is still returning to the isostatic equilibrium due to the deglaciation of the Larentia ice sheet accumulated in this region during the last glacial maximum. Recent analysis using T/P satellite altimetry and 50 longterm lake gauge records provides a lake-wide vertical motion estimate of the entire Great Lakes (Kuo et al 2008). The local vertical motion in the southern bank of Lake Erie is estimated to be 0.2 mm yr -1 (subsidence).…”

Section: Vertical Motionmentioning

confidence: 99%

“…Vertical motion of coastal region could also be substantial due to erosion, subsidence due to hydrological extraction, tectonic, and other phenomena. In this study, we simply adopt the measurement model by Kuo et al (2008) to account for the crustal deformation in Lake Erie.…”

Section: Vertical Motionmentioning

confidence: 99%

Accurate Linking of Lake Erie Water Level with Shoreline Datum Using GPS Buoy and Satellite Altimetry

Cheng¹,

Kuo²,

Shum³

et al. 2008

Terr. Atmos. Ocean. Sci.

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There is a need to accurately link the water level to the shoreline vertical datum for various applications including coastal management, lake/river/estuary/wetland hydrological or storm surge modeling/forecasting. Coastal topography is historically surveyed and referenced to the predetermined vertical datum in terms of orthometric heights, or the heights above the geoid, which is poorly known in terms of accuracy and lack of adequate spatial resolution for coastal applications such as estuary or storm surge modeling. We demonstrate an accurate linking of the lake surface to a shoreline datum using satellite techniques, including GPS buoy and satellite altimetry, water level gauges, and local geoid and lake circulation models. The possible error sources are analyzed and an error budget is reported in this study. An innovated method to estimate geoid height near the water level gauge using a GPS buoy is proposed. It is found that at a 95% confidence interval, the method is consistent with the National Geodetic Survey GEOID03 geoid model. The lake surface represented using a lake circulation model provided by the Great Lakes Forecasting Systems is also verified with kriging based on the data (1999 -2001) from the water level gauge, and TOPEX/POSEIDON altimeter. Mean discrepancies of 2.7 and 7.2 cm are found with the data from the gauges around Lake Erie, and from the combination of the gauges and the altimeter, respectively. It reveals that the current dominant limitation of more accurate linking of water surface to shoreline is the insufficient knowledge of geoid in the current models. Further improvement is feasible through more accurate and higher resolution modeling of the lake geoid.Key words: Satellite altimetry, GPS buoy, Water level gauges, Geoid Citation: Cheng, K. C., C. Y. Kuo, C. K. Shum, X. Niu, R. Li, and K. W. Bedford, 2008: Accurate linking of Lake Erie water level with shoreline datum using GPS buoy and satellite altimetry.

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Vertical Motion Determined Using Satellite Altimetry and Tide Gauges

Cited by 47 publications

References 21 publications

Application of TOPEX Altimetry for Solid Earth Deformation Studies

Application of TOPEX Altimetry for Solid Earth Deformation Studies

The role of glacial isostatic adjustment in the present-day crustal motion and sea levels of East Asia

Accurate Linking of Lake Erie Water Level with Shoreline Datum Using GPS Buoy and Satellite Altimetry

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