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Title |
Sea level rise at Kerguelen island over the last 55 years. |
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Conference - International - Poster |
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2006 |
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WRCP Workshop -Understanding Sea-level Rise and Variability, Paris. |
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yes |
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4754 |
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Coastal multi-satellite altimetry data and tide gauges records techniques, applications and validation. |
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Conference - International - Poster |
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2006 |
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European Geosciences Union (EGU), Vienne |
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688 |
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yes |
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4755 |
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Author |
Testut L., F. Lyard, G. Jan and S. Calmant. |
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Title |
High standard tide gauge network for scientific studies. |
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Conference - International - Poster |
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2006 |
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Ocean Surface Topography Scientific-Team (OST-ST) meeting. |
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688 |
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yes |
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4756 |
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Author |
Maraldi C., L. Testut, F. Birol and L. Roblou |
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Title |
Validation of T/P data in the South Indian Ocean. |
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Conference - International - Poster |
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2006 |
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Ocean Surface Topography Scientific-Team (OST-ST) meeting. |
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688 |
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yes |
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4757 |
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Conference - National - Article without Reading Comitee |
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2005 |
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688 |
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yes |
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4758 |
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Author |
Maraldi C., B. Galton-Fenzi, F. Lyard, L. Testut, R. Coleman and B. Legresy |
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Title |
Barotropic tides in the Southern Indian Ocean. |
Type |
Conference - International - Communication |
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2007 |
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Abstract |
OSTST Meeting, 12-15 March 2007, Hobart |
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688 |
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yes |
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Serial |
4760 |
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Conference - National - Communication |
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2006 |
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Abstract |
Colloque SONEL, 18-19 April 2006, La Rochelle |
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688 |
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yes |
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4761 |
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Author |
Testut L., R. Coleman, H. Brolsma, C. Watson, R. Handsworth and M. Calzas |
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Title |
Estimating long term sea level trends in East Antarctica |
Type |
Conference - International - Poster |
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Year |
2008 |
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Joint SCAR-IASC Open Science Conference, 8-11 July 2008, St. petersbourg |
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688 |
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yes |
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5164 |
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Title |
Historical sea level trends in the Southern Ocean from tide gauges |
Type |
Conference - International - Poster |
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Year |
2008 |
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William Smith Meeting : Observations and Causes of Sea-Level Changes on Millennial to Decadal Timescales, 1-2 Sept. 2008, London. |
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688 |
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yes |
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5169 |
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Author |
Maraldi C., M. Mongin, R. Coleman and L. Testut. |
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Title |
The influence of lateral mixing on a phytoplankton bloom : Distributionin the Kerguelen Plateau. |
Type |
Journal Article |
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Year |
2009 |
Publication |
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS |
Abbreviated Journal |
Deep Sea Res. Part I Oceanogr. Res. Pap. |
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Volume |
56 |
Issue |
6 |
Pages |
963-973 |
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Abstract |
A very unique phytoplankton bloom appears every year during the austral spring/summer in the Northern Kerguelen Plateau region. The Kerguelen Ocean and Plateau compared Study (KEOPS) showed that an increase in subsurface iron coming up from the seafloor through vertical mixing was responsible for the observed increase in chlorophyll-a above the plateau. We demonstrate that the bloom pattern is not a simple increase of biomass over shallow water: it is strongly influenced by the bathymetry and its spatial extent controlled by strong currents around the plateau. Here we focus on the lateral mixing process to find explanations for the particular shape of the bloom. We use the Smagorinsky (1963) formula to estimate and map fields of lateral mixing time scales ( ) due to barotropic tidal currents, barotropic atmospheric forced currents, Ekman and geostrophic velocities. Results show that short time scale mixing is strongly influenced by the tidal process while the other processes have minor influences. Comparisons of lateral mixing coefficient and satellite chlorophyll-a images show that the spatial pattern of the bloom seems to be delimited by a barrier of high lateral mixing that is essentially due to tides. This emphasises the role played by the tides over the Kerguelen Plateau, in supplying iron to the phytoplankton and by containing the horizontal shape of the bloom. This is one of the first times such a link has been demonstrated, which has implications for the study of iron advection in the ocean. |
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0967-0637 |
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5939 |
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