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  • 1
    Online Resource
    Online Resource
    Altimetry-based sea level trends along the coasts of Western Africa
    Elsevier BV ; 2021
    In:  Advances in Space Research Vol. 68, No. 2 ( 2021-07), p. 504-522
    Details
    In: Advances in Space Research, Elsevier BV, Vol. 68, No. 2 ( 2021-07), p. 504-522
    Type of Medium: Online Resource
    ISSN: 0273-1177
    URL: Article
    DOI: 10.1016/j.asr.2019.05.033
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
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    SSG: 16,12
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  • 2
    Online Resource
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    Interannual Variations of Surface Currents and Transports in the Sicily Channel Derived From Coastal Altimetry
    American Geophysical Union (AGU) ; 2017
    In:  Journal of Geophysical Research: Oceans Vol. 122, No. 11 ( 2017-11), p. 8330-8353
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 122, No. 11 ( 2017-11), p. 8330-8353
    Abstract: A 20 year time series of coastal altimetry reveals interannual variability modes of the surface circulation in the Sicily Channel The variations of its volume transports are estimated with an empirical transport‐like model Interannual variability results from the Atlantic waters inflow and modulations of the mesoscale activity in coupled or compensating ways
    Type of Medium: Online Resource
    ISSN: 2169-9275 , 2169-9291
    URL: Issue
    URL: Article
    DOI: 10.1002/jgrc.v122.11
    DOI: 10.1002/2017JC012836
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2017
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    SSG: 16,13
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  • 3
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    Coastal sea level rise at Senetosa (Corsica) during the Jason altimetry missions
    Copernicus GmbH ; 2020
    In:  Ocean Science Vol. 16, No. 5 ( 2020-10-07), p. 1165-1182
    Details
    In: Ocean Science, Copernicus GmbH, Vol. 16, No. 5 ( 2020-10-07), p. 1165-1182
    Abstract: Abstract. In the context of the ESA Climate Change Initiative project, we are engaged in a regional reprocessing of high-resolution (20 Hz) altimetry data of the classical missions in a number of the world's coastal zones. It is done using the ALES (Adaptive Leading Edge Subwaveform) retracker combined with the X-TRACK system dedicated to improve geophysical corrections at the coast. Using the Jason-1 and Jason-2 satellite data, high-resolution, along-track sea level time series have been generated, and coastal sea level trends have been computed over a 14-year time span (from July 2002 to June 2016). In this paper, we focus on a particular coastal site where the Jason track crosses land, Senetosa, located south of Corsica in the Mediterranean Sea, for two reasons: (1) the rate of sea level rise estimated in this project increases significantly in the last 4–5 km to the coast compared to what is observed further offshore, and (2) Senetosa is the calibration site for the TOPEX/Poseidon and Jason altimetry missions, which are equipped for that purpose with in situ instrumentation, in particular tide gauges and a Global Navigation Satellite System (GNSS) antenna. A careful examination of all the potential errors that could explain the increased rate of sea level rise close to the coast (e.g., spurious trends in the geophysical corrections, imperfect inter-mission bias estimate, decrease of valid data close to the coast and errors in waveform retracking) has been carried out, but none of these effects appear able to explain the trend increase. We further explored the possibility that it results from real physical processes. Change in wave conditions was investigated, but wave setup was excluded as a potential contributor because the magnitude was too low and too localized in the immediate vicinity of the shoreline. A preliminary model-based investigation about the contribution of coastal currents indicates that it could be a plausible explanation of the observed change in sea level trend close to the coast.
    Type of Medium: Online Resource
    ISSN: 1812-0792
    URL: Article
    DOI: 10.5194/os-16-1165-2020
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2020
    detail.hit.zdb_id: 2183769-7
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  • 4
    Online Resource
    Online Resource
    Satellite Altimetry Measurements of Sea Level in the Coastal Zone
    Springer Science and Business Media LLC ; 2019
    In:  Surveys in Geophysics Vol. 40, No. 6 ( 2019-11), p. 1319-1349
    Details
    In: Surveys in Geophysics, Springer Science and Business Media LLC, Vol. 40, No. 6 ( 2019-11), p. 1319-1349
    Type of Medium: Online Resource
    ISSN: 0169-3298 , 1573-0956
    URL: Article
    DOI: 10.1007/s10712-019-09569-1
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2019
    detail.hit.zdb_id: 2017797-5
    SSG: 16,13
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  • 5
    Online Resource
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    Source of the baroclinic waves in the southeast Indian Ocean
    American Geophysical Union (AGU) ; 2001
    In:  Journal of Geophysical Research: Oceans Vol. 106, No. C5 ( 2001-05-15), p. 9145-9160
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 106, No. C5 ( 2001-05-15), p. 9145-9160
    Abstract: The dynamics of the seasonal and interannual sea level variability in the southeast Indian Ocean are investigated using a simple model of low‐frequency quasi‐geostrophic thermocline variability in order to determine whether the observed variability responds primarily to local or remote forcing. This region is important for climate studies, in relation to the interannual variations of the tropical oceans and atmosphere. The eastern Indian Ocean is directly forced by the strong seasonal monsoons as well as by a remote ocean forcing from the tropical Indian Ocean and by the western Pacific via the Indonesian Throughflow. As a result, the dynamics of the southeast Indian Ocean are unique, with unusually large variability and bands of energetic Rossby waves. The annual wave signal around 10°S is clearly marked and a band of propagating mesoscale variability between 20° and 35°S extends across the entire Indian Ocean, with characteristic timescales between 100 and 200 days. There is also strong interannual variability. To investigate the origin of the observed long baroclinic waves, we use a simple reduced gravity model allowing the radiation of long waves due to Ekman pumping and the radiation of long waves from the eastern boundary. Eastern boundary conditions are given by expendable bathythermograph data. In the band 10°–15°S the thermocline depth oscillation corresponds mainly to waves radiating from wind forcing in the east. Their amplitude is strongly damped west of 90°E. In the southeastern tropical Indian Ocean (STIO) the influence of free waves emanating from the eastern boundary is small but significant. In addition, a strong interannual signal appears to originate from Lombok Strait to the north and propagates southwestward into the STIO. In the band 20°–35°S the observed waves appear to be free waves generated by eastern boundary processes.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2000JC900044
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2001
    detail.hit.zdb_id: 2033040-6
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    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
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    detail.hit.zdb_id: 3094268-8
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    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 6
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    Divergent clonal selection dominates medulloblastoma at recurrence
    Springer Science and Business Media LLC ; 2016
    In:  Nature Vol. 529, No. 7586 ( 2016-1), p. 351-357
    Details
    In: Nature, Springer Science and Business Media LLC, Vol. 529, No. 7586 ( 2016-1), p. 351-357
    Type of Medium: Online Resource
    ISSN: 0028-0836 , 1476-4687
    URL: Article
    DOI: 10.1038/nature16478
    RVK:
    TA 1000
    RVK:
    UA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2016
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    detail.hit.zdb_id: 1413423-8
    SSG: 11
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  • 7
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    Observability of fine-scale ocean dynamics in the northwestern Mediterranean Sea
    Copernicus GmbH ; 2017
    In:  Ocean Science Vol. 13, No. 1 ( 2017-01-13), p. 13-29
    Details
    In: Ocean Science, Copernicus GmbH, Vol. 13, No. 1 ( 2017-01-13), p. 13-29
    Abstract: Abstract. Technological advances in the recent satellite altimeter missions of Jason-2, SARAL/AltiKa and CryoSat-2 have improved their signal-to-noise ratio, allowing us to observe finer-scale ocean processes with along-track data. Here, we analyse the noise levels and observable ocean scales in the northwestern Mediterranean Sea, using spectral analyses of along-track sea surface height from the three missions. Jason-2 has a higher mean noise level with strong seasonal variations, with higher noise in winter due to the rougher sea state. SARAL/AltiKa has the lowest noise, again with strong seasonal variations. CryoSat-2 is in synthetic aperture radar (SAR) mode in the Mediterranean Sea but with lower-resolution ocean corrections; its statistical noise level is moderate with little seasonal variation. These noise levels impact on the ocean scales we can observe. In winter, when the mixed layers are deepest and the submesoscale is energetic, all of the altimeter missions can observe wavelengths down to 40–50 km (individual feature diameters of 20–25 km). In summer when the submesoscales are weaker, SARAL can detect ocean scales down to 35 km wavelength, whereas the higher noise from Jason-2 and CryoSat-2 blocks the observation of scales less than 50–55 km wavelength. This statistical analysis is completed by individual case studies, where filtered along-track altimeter data are compared with co-located glider and high-frequency (HF) radar data. The glider comparisons work well for larger ocean structures, but observations of the smaller, rapidly moving dynamics are difficult to co-locate in space and time (gliders cover 200 km in a few days, altimetry in 30 s). HF radar surface currents at Toulon measure the meandering Northern Current, and their good temporal sampling shows promising results in comparison to co-located SARAL altimetric currents. Techniques to separate the geostrophic component from the wind-driven ageostrophic flow need further development in this coastal band.
    Type of Medium: Online Resource
    ISSN: 1812-0792
    URL: Article
    DOI: 10.5194/os-13-13-2017
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2017
    detail.hit.zdb_id: 2183769-7
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  • 8
    Online Resource
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    Synergy between in situ and altimetry data to observe and study Northern Current variations (NW Mediterranean Sea)
    Copernicus GmbH ; 2019
    In:  Ocean Science Vol. 15, No. 2 ( 2019-03-13), p. 269-290
    Details
    In: Ocean Science, Copernicus GmbH, Vol. 15, No. 2 ( 2019-03-13), p. 269-290
    Abstract: Abstract. During the last 15 years, substantial progress has been achieved in altimetry data processing, now providing data with enough accuracy to illustrate the potential of these observations for coastal applications. In parallel, new altimetry techniques improve data quality by reducing land contamination and enhancing the signal-to-noise ratio. Satellite altimetry provides more robust and accurate measurements ever closer to the coast and resolve shorter ocean signals. An important issue is now to learn how to use altimetry data in conjunction with other coastal observing techniques. Here, we cross-compare and combine the coastal currents provided by large datasets of ship-mounted acoustic Doppler current profilers (ADCPs), gliders, high-frequency (HF) radars and altimetry. We analyze how the different available observing techniques, with a particular focus on altimetry, capture the Northern Current variability at different timescales. We also study the coherence, divergence and complementarity of the information derived from the different instruments considered. Two generations of altimetry missions and both 1 Hz and high-rate measurements are used: Jason-2 (nadir Ku-band radar) and SARAL/AltiKa (nadir Ka-band altimetry); their performances are compared. In terms of mean speed of the Northern Current, a very good spatial continuity and coherence is observed at regional scale, showing the complementarity among the types of current measurements. In terms of current variability, there is still a good spatial coherence but the Northern Current amplitudes derived from altimetry, glider, ADCP and HF radar data differ, mainly because of differences in their respective spatial and temporal resolutions. If we consider seasonal variations, 1 Hz altimetry captures ∼60 % and ∼55 % of the continental slope current amplitude observed by the gliders and by the ADCPs, respectively. For individual dates this number varies a lot as a function of the characteristics of the Northern Current on the corresponding date, with no clear seasonal tendency observed. Compared to Jason-2, the SARAL altimeter data tend to give estimations of the NC characteristics that are closer to in situ data in a number of cases. The much noisier high-rate altimetry data appear to be more difficult to analyze but they provide current estimates that are generally closer to the other types of current measurements. Thus, satellite altimetry provides a synoptic view of the Northern Current circulation system and variability, which helps to interpret the other observations. Its regular sampling allows for the observation of many features that may be missed by irregular in situ data.
    Type of Medium: Online Resource
    ISSN: 1812-0792
    URL: Article
    DOI: 10.5194/os-15-269-2019
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2019
    detail.hit.zdb_id: 2183769-7
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  • 9
    Online Resource
    Online Resource
    Aspects of the seasonal variability of the Northern Current (NW Mediterranean Sea) observed by altimetry
    Elsevier BV ; 2010
    In:  Journal of Marine Systems Vol. 81, No. 4 ( 2010-6), p. 297-311
    Details
    In: Journal of Marine Systems, Elsevier BV, Vol. 81, No. 4 ( 2010-6), p. 297-311
    Type of Medium: Online Resource
    ISSN: 0924-7963
    URL: Article
    DOI: 10.1016/j.jmarsys.2010.01.005
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2010
    detail.hit.zdb_id: 1483106-5
    detail.hit.zdb_id: 1041191-4
    SSG: 14
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  • 10
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    The X-TRACK/ALES multi-mission processing system: New advances in altimetry towards the coast
    Elsevier BV ; 2021
    In:  Advances in Space Research Vol. 67, No. 8 ( 2021-04), p. 2398-2415
    Details
    In: Advances in Space Research, Elsevier BV, Vol. 67, No. 8 ( 2021-04), p. 2398-2415
    Type of Medium: Online Resource
    ISSN: 0273-1177
    URL: Article
    DOI: 10.1016/j.asr.2021.01.049
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 2023311-5
    SSG: 16,12
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