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Gaël Durand, Olivier Gagliardini, Thomas Zwinger, Emmanuel Le Meur, Richard C. A. Hindmarsh |
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Full Stokes modeling of marine ice sheets: influence of the grid size |
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2009 |
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Annals of glaciology |
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50 |
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52 |
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109-114 |
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Using the finite-element code Elmer, we show that the full Stokes modeling of the ice-sheet/ice-shelf transition we propose can give consistent predictions of grounding-line migration. Like other marine ice-sheet models our approach is highly sensitive to the chosen mesh resolution. However, with a grid size down to <5 km in the vicinity of the grounding line, predictions start to be robust because: (1) whatever the grid size (<5 km) the steady-state grounding-line position is sensibly the same (6 km standard deviation), and (2) with a grid-size refinement in the vicinity of the grounding line (200 m), the steady-state solution is independent of the applied perturbation in fluidity, provided this perturbation remains monotonic. |
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0260-3055, 1727-5644 |
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1870 |
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Luc Lambs, Perrine Mangion, Eric Mougin, François Fromard |
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Title |
Water cycle and salinity dynamics in the mangrove forests of Europa and Juan de Nova Islands, southwest Indian Ocean |
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2016 |
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Rapid Communications in Mass Spectrometry |
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30 |
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2 |
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311-320 |
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Rationale The functioning of mangrove forests found on small coralline islands is characterized by limited freshwater inputs. Here, we present data on the water cycling of such systems located on Europa and Juan de Nova Islands, Mozambique Channel. Methods In order to better understand the water cycle and mangrove growth conditions, we have analysed the hydrological and salinity dynamics of the systems by gauge pressure and isotopic tracing (δ18O and δ2H values). Results Both islands have important seawater intrusion as measured by the water level change and the high salinities in the karstic ponds. Europa Island displays higher salinity stress, with its inner lagoon, but presents a pluri-specific mangrove species formation ranging from shrub to forest stands. No freshwater signal could be detected around the mangrove trees. On Juan de Nova Island, the presence of sand and detrital sediment allows the storage of some amount of rainfall to form a brackish groundwater. The mangrove surface area is very limited with only small mono-specific stands being present in karstic depression. Conclusions On the drier Europa Island, the salinity of all the water points is equal to or higher than that of the seawater, and on Juan de Nova the groundwater salinity is lower (5 to 20 PSU). This preliminary study shows that the karstic pothole mangroves exist due to the sea connection through the fractured coral and the high tidal dynamics. Copyright © 2015 John Wiley & Sons, Ltd. |
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1097-0231 |
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1097-0231 |
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7056 |
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P. L. Woodworth, J. R. Hunter, M. Marcos, P. Caldwell, M. Menéndez, I. Haigh |
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Title |
Towards a global higher-frequency sea level dataset |
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2016 |
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Geoscience Data Journal |
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3 |
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2 |
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50-59 |
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international data centres sea level data tide gauges |
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This paper describes the assembly of an updated quasi-global dataset of higher-frequency sea level information obtained from tide gauges operated by many agencies around the world. We believe that the construction of such a dataset is fundamental to scientific research in sea level variability and also to practical aspects of coastal engineering. A first version of the dataset was used in approximately a dozen published studies, and this second version is about twice the size, containing longer and more geographically representative sea level records. The dataset has acquired a digital object identifier and may be obtained from several sources. The paper mentions some of the merits of and deficiencies with the present version and takes a forward look at how the dataset may be updated in the future. |
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2049-6060 |
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2049-6060 |
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7057 |
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Téchiné P., B. Buisson, L. Testut, T. Delcroix, G. Alory. |
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Title |
Suivi de la qualité des mesures de réseaux d'observations océanographiques |
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Communication |
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2016 |
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Journées sist 2016 : séries interopérables et systèmes de traitement, 29-30 septembre 2016, montpellier. |
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7058 |
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Le Meur Y. and A. Coatanea. |
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Mission Nivmer St Paul OP3 2016, novembre 2016 |
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2016 |
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7061 |
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Author |
Brachet C. and A. Guillot. |
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Mission Nivmer 16, avril-mai 2016 |
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7062 |
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Author |
Bonnefond P., M. Calzas and E. Poirier. |
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Title |
Mission FOAM 16, janvier-février 2016 |
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2016 |
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7063 |
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Guillerm C. |
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Campagne Nivmer 16-ddu, R2/Janvier 2016 |
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7064 |
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Calzas M., C Guillerm and A Guillot. |
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Nivmer CWB, janvier 2016 |
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7065 |
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L. Lescarmontier, B. Legresy, N. W. Young, R. Coleman, L. Testut, C. Mayet, P. Lacroix |
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Rifting processes and ice-flow modulation observed on Mertz Glacier, East Antarctica |
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2015 |
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Journal of Glaciology |
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61 |
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230 |
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1183-1193 |
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Antarctic glaciology calving crevasses glacier flow glacier mechanics |
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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 in 2000 was largely reduced (1075–1225 m a−1) in 2007. Opening of the western rift decoupled the glacier from the transverse loading on the tongue driven by east–west tidal circulation. This loading previously induced time-varying lateral drag, which caused the large velocity range. Our results suggest changes in the mechanical behavior of an ice tongue impact the dynamics of the outlet glacier system and should be considered in longer-term mass-balance evaluations. |
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0022-1430, 1727-5652 |
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0022-1430, 1727-5652 |
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7066 |
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