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Testut L., B. Martin-Miguez, C. Watson, G. Wöppelmann, R. Coleman, R. Creach, H. Brolsma, R. Handsworth, N. Pouvreau, and B. Legrésy |
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Title |
Sea level trends in the Southern Ocean over the last century from historical data |
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Conference - International - Communication |
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2010 |
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EGU Meeting, 3-7 May 2010, Vienna. |
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688 |
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yes |
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3181 |
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Author |
Maraldi Claire, Lyard Florent, Testut Laurent, Coleman Richard, |
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Title |
Energetics of internal tides around the Kerguelen Plateau from modeling and altimetry
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Journal Article |
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Year |
2011 |
Publication |
J. Geophys. Res. |
Abbreviated Journal |
0148-0227 |
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Volume |
116 |
Issue |
C6 |
Pages |
C06004- |
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Keywords |
internal tides, Kerguelen Plateau, altimetry, barotropic tides, 4560 Oceanography: Physical: Surface waves and tides (1222), 4219 Oceanography: General: Continental shelf and slope processes (3002), 4223 Oceanography: General: Descriptive and regional oceanography, 4262 Oceanography: General: Ocean observing systems, 4534 Oceanography: Physical: Hydrodynamic modeling, |
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Abstract |
A barotropic tidal model, with a parameterization term to account for the internal wave drag energy dissipation, is used to examine areas of possible M2 internal tide generation in the Kerguelen Plateau region. Barotropic energy flux and a distribution of wave drag dissipation are computed. The results suggest important conversion of barotropic energy into baroclinic tide generation over the northern Kerguelen Plateau shelf break, consistent with a theoretical criterion based on ocean stratification, tidal forcing frequency, and bathymetric gradients. The sea surface height signatures of time-coherent internal tides are studied using TOPEX/Poseidon and Jason-1 altimeter data, whose ascending tracks cross nearly perpendicular to the eastern and western Kerguelen Plateau shelf break. Oscillations of a few centimeters associated with phase-locked internal tides propagate away from the plateau over distances of several hundred kilometers with a ~110 km wavelength. When reaching the frontal area of the Antarctic Circumpolar Current, the internal tide cannot be identified because of the aliasing of mesoscale variability into the same alias band as M2. Finally, using altimeter data, we estimate the M2 barotropic tidal power converted through the internal tide generation process. We find consistent values with the barotropic model parameterization estimation, which is also in good agreement with global internal tide model estimates. Combined with modeling, this study has shown that altimetry can be used to estimate internal tide dissipation.
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688 |
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AGU |
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0148-0227 |
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yes |
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3629 |
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Author |
Belén Martín Míguez, Laurent Testut, Guy Wöppelmann |
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Title |
Performance of modern tide gauges: towards mm-level accuracyJF
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Journal Article |
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Year |
2012 |
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Scientia Marina |
Abbreviated Journal |
Sci. Mar. |
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Keywords |
radar; pressure gauges; sea level changes; sea level measurement; tide gauges; Kerguelen Islands; GPS buoy, |
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Considerable efforts are being made worldwide to upgrade tide gauge networks using new technologies. Because of the unique location of the Kerguelen Islands, the measurement of sea level there has received particular attention, with up to four systems equipped with modern sensors functioning simultaneously (two pressure tide gauges, a radar tide gauge, and a GPS-equipped buoy). We analysed and compared the sea level data obtained with these systems from 2003 to 2010, together with a time series of tide pole observations. This is the first time that a multi-comparison study with tide gauges has been undertaken over such a long time span and that the stability of modern radar tide gauges has been examined. The multi-comparison enabled us to evaluate the performance of the tide gauges in several frequency ranges, identify errors and estimate their magnitude. The drift of the pressure sensors (up to 8.0 mm/yr) was found to be one of the most relevant sources of systematic error. Other sources of difference such as clock drift, scale error and different locations of the instruments were also detected. After correcting the time series of sea level for these errors we estimated an upper bound for the radar instrumental error in field condition at ~0.3 cm.
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688 |
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Bachelor's thesis |
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ISSN |
0214-8358 |
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yes |
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1845 |
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Author |
Fund F, Perosanz F, Testut L, Loyer S, |
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Title |
An Integer Precise Point Positioning technique for sea surface observations using a GPS buoy
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Journal Article |
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Year |
2013 |
Publication |
Advances in Space Research |
Abbreviated Journal |
Adv Space Res |
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51 |
Issue |
8 |
Pages |
1311-1322 |
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Keywords |
GPS, Ambiguity fixing, Tropospheric delays, Buoy, Radar gauge, |
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Abstract |
GPS data dedicated to sea surface observation are usually processed using differential techniques. Unfortunately, the precision of resulting kinematic positions is baseline-length dependent. So, high precision sea surface observations using differential GPS techniques are limited to coasts, lakes, and rivers. Recent improvements in GPS satellite products (orbits, clocks, and phase biases) make phase ambiguity fixing at the zero difference level achievable and opens up the observation of the sea surface without geographical constraints. This paper recalls the concept of the Integer Precise Point Positioning technique and discusses the precision of GPS buoy positioning. A sequential version of the GINS software has been implemented to achieve single epoch GPS positioning. We used 1 Hz data from a two week GPS campaign conducted in the Kerguelen Islands. A GPS buoy has been moored close to a radar gauge and 90 m away from a permanent GPS station. This infrastructure offers the opportunity to compare both kinematic Integer Precise Point Positioning and classical differential GPS positioning techniques to in situ radar gauge data. We found that Precise Point Positioning results are not significantly biased with respect to radar gauge data and that horizontal time series are consistent with differential processing at the sub-centimetre precision level. Nevertheless, standard deviations of height time series with respect to radar gauge data are typically [45] cm. The dominant driver for noise at this level is attributed to errors in tropospheric estimates which propagate into position solutions. |
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688 |
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Bachelor's thesis |
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ISSN |
0273-1177 |
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yes |
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Serial |
4159 |
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Author |
Testut L, Birol F, Delebecque C, |
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Title |
Regional Tidal Modeling and Evaluation of Jason-2 Tidal Geophysical Correction
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Journal Article |
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2012 |
Publication |
Marine Geodesy |
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35 |
Issue |
sup1 |
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299-313 |
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Abstract |
Through a validation exercise in the Kerguelen Island over 13 global, regional, and local tidal atlases, we have demonstrated the superiority of finite element high resolution model at the coast. The evaluation of different tidal geophysical corrections on the de-aliasing performance of the Jason-2 mission exhibited strong differences in the coastal domain (<10?20 km from the coast) with SLA variance reduction that can reach up to 30% from one model to another. The lack of resolution is pointed out as a possible responsible of these difference. |
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688 |
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Taylor & Francis |
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0149-0419 |
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yes |
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Serial |
4163 |
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Author |
Wöppelmann G., L. Testut et R. Créach |
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Title |
La montée du niveau des océans par marégraphie et géodésie spatiale : contributions françaises à une problématique mondiale |
Type |
Journal Article |
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Year |
2011 |
Publication |
Annales Hydrographiques |
Abbreviated Journal |
0373-3629 |
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Volume |
8 |
Issue |
777 |
Pages |
14-1 |
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688 |
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0373-3629 |
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yes |
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4623 |
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Author |
Legrésy, Galton-Fenzi B.K. , Lescarmontier L.G., Cougnon E., Mayet C., Testut L., Young N., Massom R., Warner R., Coleman R. |
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Title |
Dynamics of Mertz Glacier and its ice tongue, East Antarctica: implications of its calving and changes at various time scales |
Type |
Conference - International - Communication |
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Year |
2011 |
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Abstract |
International Symposium on Changes in Glaciers and Ice Sheets, 28 Jul. – 2 Aug. 2013, Beijing (China).
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688 |
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yes |
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4627 |
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Author |
Mayet C, Testut L, Legresy B, Lescarmontier L, Lyard F, |
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Title |
High-resolution barotropic modeling and the calving of the Mertz Glacier, East Antarctica
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Journal Article |
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2013 |
Publication |
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS |
Abbreviated Journal |
J. Geophys. Res. Oceans |
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Volume |
118 |
Issue |
10 |
Pages |
5267-5279 |
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Keywords |
0732 Icebergs, 0758 Remote sensing, 4512 Currents, 4534 Hydrodynamic modeling, 9310 Antarctica, barotropic, calving, icebergs, Mertz Glacier, model, |
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Abstract |
In February 2010, the Mertz Glacier Tongue (MGT) calved, releasing an 80 × 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 circulation before, during, and after the calving event. The currents changed substantially in the neighborhood of the MGT and icebergs. The barotropic model with tidal and atmospheric forcing and the atmospheric wind fields allow us to evaluate the forces acting on the MGT. The sea surface slope force dominates the budget. Calving occurred when high tide and strong nontidal currents (due to atmospheric forcing) combined to lead to the monthly maximum forces exerted on the MGT (i.e., between 10 and 13 February 2010). While the forces are not unusually large at the calving time, the currents are largely enhanced in the rifting area. Therefore, processes related to these currents, like melting the ice mélange inside the rifts, should be investigated to fully explain the final stage of the calving. |
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688 |
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2169-9291 |
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yes |
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4535 |
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Author |
Gaël André, Belén Martín Míguez, Valérie Ballu, Laurent Testut, Guy Wöppelmann |
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Title |
Measuring sea-level with GPS-equipped buoys: A multi-instruments experiment at Aix Island |
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Journal Article |
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Year |
2013 |
Publication |
International Hydrographic Review |
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27-38 |
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688 |
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0020-6946 |
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yes |
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Serial |
4812 |
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Author |
Delebecque C., F. Lyard, F. Birol, N. Ayoub, L. Testut, L. Roblou |
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Title |
Using CTOH tidal constants for coastal studies |
Type |
Conference - International - Communication |
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Year |
2013 |
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7th Coastal Altimetry Workshop, 7-8 Oct. 2013. Boulder (USA).
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688 |
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4814 |
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