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| Lescarmontier, L.; Legresy, B.; Coleman, R.; Perosanz, F.; Mayet, C.; Testut, L.. |
| At the time of its calving in February 2010, Mertz Glacier, East Antarctica, was characterized by a 145km long, 35km wide floating tongue. In this paper, we use GPS data from the Collaborative Research into Antarctic Calving and Iceberg Evolution (CRAC-ICE) 2007/08 and 2009/10 field seasons to investigate the dynamics of Mertz Glacier. Twomonths of data were collected at the end of the 2007/08 field season from two kinematic GPS stations situated on each side of the main rift of the glacier tongue and from rock stations located around the ice tongue during 2008/09. Using Precise Point Positioning with integer ambiguity fixing, we observe that the two GPS stations recorded vibrations of the ice tongue with several dominant periods. We compare these results... |
| Tipo: Text |
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| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00140/25136/23246.pdf |
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| Lescarmontier, L.; Legresy, B.; Young, N. W.; Coleman, R.; Testut, L.; Mayet, C.; Lacroix, P. |
| We investigated the evolution of two major rifts cutting across Mertz Glacier Tongue, East Antarctica, using a combination of satellite images and 60 day sets of GPS data from two stations deployed either side of the western rift in 2007. The eastern rift began to open in the early 1990s, and the western rift initiated in 2002 in conjunction with the collision of a large iceberg with the tongue. Velocity time series derived from the 2007 GPS data exhibited strong variations at tidal periods modulated by sea-surface height and sea-surface slope and reproduced here with a conceptually simple model. We found that opening of the western rift in 2002 leads to a dramatic change in behavior of the tongue as the large range in velocity (700-2400 m a(-1)) observed... |
| Tipo: Text |
Palavras-chave: Antarctic glaciology; Calving; Crevasses; Glacier flow; Glacier mechanics. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00489/60023/63276.pdf |
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| Mayet, C.; Testut, L.; Legresy, B.; Lescarmontier, L.; Lyard, F.. |
| In February 2010, the Mertz Glacier Tongue (MGT) calved, releasing an 80 x 40 km iceberg. We have developed a high-resolution barotropic ocean model of the region to simulate the local circulation in response to tides and atmospheric forcing. We improved the coastline, grounding line position and built a new bathymetry using satellite imagery and older bathymetry data to derive the best available tidal model for the region. We compared this and other available models to seven different sea level observations available in the area and significantly improved the tidal solutions reaching a root sum square of 2.3 cm. This model was then run in different bathymetric configurations, considering the ice draft of the major icebergs B9B and C28, to simulate the... |
| Tipo: Text |
Palavras-chave: Mertz Glacier; Icebergs; Calving; Barotropic; Model. |
| Ano: 2013 |
URL: https://archimer.ifremer.fr/doc/00244/35568/34097.pdf |
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| Testut, L.; Miguez, B. Martin; Woeppelmann, G.; Tiphaneau, P.; Pouvreau, N.; Karpytchev, M.. |
| A data archeology exercise was carried out on sea level observations recorded during the transit of Venus across the Sun observed in 1874 from Saint Paul Island (38 degrees 41'S, 77 degrees 31 E) in the southern Indian Ocean. Historical (1874) and recent (1994-2009) sea level observations were assembled into a consistent time series. A thorough check of the data and its precise geodetic connection to the same datum was only possible thanks to the recent installation of new technologies (GPS buoy and radar water level sensor) and leveling campaigns. The estimated rate of relative sea level change, spanning the last 135 years at Saint Paul Island, was not significantly different from zero (-0.1 +/- 0.3mm yr(-1)), a value which could be reconciled with... |
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| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00230/34136/32777.pdf |
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