Long-term monitoring by absolute gravimetry: Tides to postglacial rebound

Lambert, A.; Courtier, N.; James, Thomas S.

doi:10.1016/j.jog.2005.08.032

Cited by 74 publications

(64 citation statements)

References 26 publications

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“…Other work indicates thinner ice in this region (e.g. Lambert et al, 2006;Argus and Peltier, 2010;Mazzotti et al, 2011), including the most recent ICE-6G modelling , which shows ice thickness over Keewatin that are 1.5 km thinner than ICE-5G (Vettoretti and Peltier, 2013). A suite of new radiocarbon dates that constrain the relative sea-level history of Arviat on the west coast of Hudson Bay are also consistent with a peak thickness of ~3.4 km at the LLGM (Simon et al, 2014).…”

Section: Quantification Of Lis Volume At Its Local Last Glacial Maximsupporting

confidence: 53%

Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum

Stokes

2017

CIG

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ABSTRACT. The last deglaciation of the Laurentide Ice Sheet (LIS) was associated with major reorganisations in the ocean-climate system and its retreat also represents a valuable analogue for understanding the rates and mechanisms of ice sheet collapse. This paper reviews the characteristics of the LIS at its Last GlacialMaximum (LGM) La deglaciación del inlandsis Lauréntide desde el Último Máximo Glaciar RESUMEN. La última deglaciación del inlandsis Lauréntide (LIS) estuvo relacionada con grandes reorganizaciones en el océano-clima y su retroceso representa un valioso ejemplo para comprender las tasas y mecanismos del colapso del inlandsis. Este artículo revisa las características del LIS en su Último Máximo Glaciar (LGM) y su consiguiente deglaciación, con especial énfasis en

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Section: Quantification Of Lis Volume At Its Local Last Glacial Maximsupporting

confidence: 53%

Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum

Stokes

2017

CIG

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“…Thus, this station is a test case for evaluating the resolution of repeated AG measurements for measuring gravity changes. This anthropogenic rate of change is similar to that expected because of GIA in Fennoscandia and northern Canada [Timmen et al, 2006;Lambert et al, 2006], in river deltas like the Mississippi [González and Törnqvist, 2006], or at plate boundaries [Hayes et al, 2006].…”

Section: The Profilesupporting

confidence: 77%

Repeated absolute gravity measurements for monitoring slow intraplate vertical deformation in western Europe

et al. 2011

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In continental plate interiors, ground surface movements are at the limit of the noise level and close to or below the accuracy of current geodetic techniques. Absolute gravity measurements are valuable to quantify slow vertical movements, as this instrument is drift free and, unlike GPS, independent of the terrestrial reference frame. Repeated absolute gravity (AG) measurements have been performed in Oostende (Belgian coastline) and at eight stations along a southwest‐northeast profile across the Belgian Ardennes and the Roer Valley Graben (Germany), in order to estimate the tectonic deformation in the area. The AG measurements, repeated once or twice a year, can resolve elusive gravity changes with a precision better than 3.7 nm/s2/yr (95% confidence interval) after 11 years, even in difficult conditions. After 8–15 years (depending on the station), we find that the gravity rates of change lie in the [−3.1, 8.1] nm/s2/yr interval and result from a combination of anthropogenic, climatic, tectonic, and glacial isostatic adjustment (GIA) effects. After correcting for the GIA, the inferred gravity rates and consequently, the vertical land movements, reduce to zero within the uncertainty level at all stations except Jülich (because of man‐induced subsidence) and Sohier (possibly, an artifact because of the shortness of the time series at that station).

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“…This is in contrast to some parts of Canada, where postglacial uplift occurs at much larger rates. For example, the port of Churchill on Hudson Bay is rising at about 10 mm/a (Lambert et al, 2006). Here, local sea level would be expected to continue to fall, even at the largest projected values of global sea-level rise.…”

Section: Crustal Response and Projected Sea-level Changementioning

confidence: 99%

Relative Sea-Level Change in the Northern Strait of Georgia, British Columbia*

James

Hutchinson

Barrie

et al. 2007

gpq

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Twenty-four new radiocarbon dates from isolation basin cores, excavations and natural exposures, and an archeological site, constrain relative sea-level change since the last glaciation in the northern Strait of Georgia, British Columbia. Relative sea level fell rapidly from about 150 m elevation to 45 m elevation from 11 750 to 11 000 BP (13 750 to 13 000 cal BP), then its rate of fall slowed. The initial rapid emergence began soon after the transition from proximal to distal glaciomarine sedimentation, when the glacial front retreated from the Strait of Georgia and the Earth’s surface was unloaded. A sea-level lowstand a few metres below present-day sea level may have occurred in the early Holocene, but sea level was near its present level by 2000 BP. Sea-level change in the northern Strait of Georgia lagged the mid Strait of Georgia, 80 km to the south, by a few hundred years during initial emergence. The lowstand in the northern strait was later and probably shallower than in the mid strait. Isostatic depression inferred from the sea-level observations can be fit with two decaying exponential terms with characteristic decay times of 500 and 2600 years. The faster decay time corresponds to a shallow mantle viscosity of about 1019 Pa s, consistent with previous glacio-isostatic modelling. The present-day crustal uplift rate from the residual isostatic effects of the Cordilleran Ice Sheet is about 0.25 mm/a. Crustal uplift is not expected to significantly ameliorate projected sea-level rise in the mid and northern Strait of Georgia because present-day vertical crustal movements are inferred to be small.Vingt-quatre nouvelles dates au 14C provenant de carottes sédimentaires de bassins isolés, d’excavations, de coupes naturellement exposées et archéologiques permettent de cerner les changements du niveau marin relatif depuis la dernière glaciation dans la partie nord du détroit de Géorgie, en Colombie-Britannique. Le niveau marin relatif a rapidement passé de 150 m à 45 m d’altitude entre 11 750 et 11 000 ans BP (13 750-13 000 cal. BP), le taux d’abaissement ayant ralenti par la suite. L’émersion initiale rapide correspond à la fin de la sédimentation glaciomarine distale qui accompagnait le retrait du front glaciaire. Un bas niveau de quelques mètres sous le niveau actuel a pu s’instaurer durant l’Holocène inférieur, jusqu’en 2000 ans BP. Au début, le soulèvement isostatique a accusé un retard de quelques siècle sur celui de la zone du détroit à 80 km plus au sud. Le bas niveau de la partie nord du détroit est survenu plus tard et fut moins prononcé. Les données indiquent un enfoncement isostatique de type exponentiel avec des constantes de désintégration de 500 et de 2600 ans 14C. Le taux le plus rapide correspond à une viscosité du manteau terrestre d’environ 1019 Pa s, ce qui concorde avec les résultats de la modélisation glacio-isostatique. Le taux de soulèvement glacio-isostatique actuel résultant de l’inlandsis de la Cordillère s’établit à environ 0,25 mm/a. Ce taux ne peut contrer les effets du rehaussemen...

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Long-term monitoring by absolute gravimetry: Tides to postglacial rebound

Cited by 74 publications

References 26 publications

Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum

Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum

Repeated absolute gravity measurements for monitoring slow intraplate vertical deformation in western Europe

Relative Sea-Level Change in the Northern Strait of Georgia, British Columbia*

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