LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 6 of total 6

Search options

  1. Article: High-Resolution Ocean Currents from Sea Surface Temperature Observations: The Catalan Sea (Western Mediterranean)

    Isern-Fontanet, Jordi / García-Ladona, Emilio / González-Haro, Cristina / Turiel, Antonio / Rosell-Fieschi, Miquel / Company, Joan B. / Padial, Antonio

    Remote Sensing. 2021 Sept. 11, v. 13, no. 18

    2021  

    Abstract: Current observations of ocean currents are mainly based on altimetric measurements of Sea Surface Heights (SSH), however the characteristics of the present-day constellation of altimeters are only capable to retrieve surface currents at scales larger ... ...

    Abstract Current observations of ocean currents are mainly based on altimetric measurements of Sea Surface Heights (SSH), however the characteristics of the present-day constellation of altimeters are only capable to retrieve surface currents at scales larger than 50–70 km. By contrast, infrared and visible radiometers reach spatial resolutions thirty times higher than altimeters under cloud-free conditions. During the last years, it has been shown how the Surface Quasi-Geostrophic (SQG) approximation is able to reconstruct surface currents from measured Sea Surface Temperature (SST), but it has not been yet used to retrieve velocities at scales shorter than those provided by altimeters. In this study, the velocity field of ocean structures with characteristic lengths between 10 and 20 km has been derived from infrared SST using the SQG approach and compared to the velocities derived from the trajectories of Lagrangian drifters. Results show that the SQG approach is able to reconstruct the direction of the velocity field with observed RMS errors between 8 and 15 degrees and linear correlations between 0.85 and 0.99. The reconstruction of the modulus of the velocity is more problematic due to two limitations of the SQG approach: the need to calibrate the level of energy and the ageostrophic contributions. If drifter trajectories are used to calibrate velocities and the analysis is restricted to small Rossby numbers, the RMS error in the range of 10 to 16 cm/s and linear correlations can be as high as 0.97.
    Keywords altimeters ; energy ; exhibitions ; fields ; height ; infrared radiometers ; length ; measurement ; oceans ; remote sensing ; surface water temperature ; surfaces ; water currents
    Language English
    Dates of publication 2021-0911
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2513863-7
    ISSN 2072-4292
    ISSN 2072-4292
    DOI 10.3390/rs13183635
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  2. Article: Zonal jets in the equatorial Atlantic Ocean

    Rosell-Fieschi, Miquel / Jéröme Gourrion / Josep L. Pelegrí

    Progress in oceanography. 2015 Jan., v. 130

    2015  

    Abstract: We use position data from Argo floats, smoothed out over 400km×200km zonal ellipses and interpolated onto a 0.5° grid, to investigate the zonal jet structure of the flow field at the sea surface and on three subsurface layers (Central Waters, CW, 200m; ... ...

    Abstract We use position data from Argo floats, smoothed out over 400km×200km zonal ellipses and interpolated onto a 0.5° grid, to investigate the zonal jet structure of the flow field at the sea surface and on three subsurface layers (Central Waters, CW, 200m; Antarctic Intermediate Waters, AAIW, 1000m; upper North Atlantic Deep Waters, uNADW, 1500m) in the equatorial Atlantic Ocean (15°S to 15°N). The annual-mean fields exhibit narrow zonal jets, typically 4–5° wide at the sea surface and only 2° at the subsurface levels, with directions alternating in latitude and maximum speeds about 0.5ms−1 at the surface, 0.1ms−1 at CW and uNADW, and 0.03ms−1 at AAIW. The available data also allows us to explore the seasonal variability of these jets at the surface and AAIW levels. The surface currents are dominated by an annual cycle between 4°N and 10°N and, to a lesser degree, by a semi-annual contribution close to the equator. This variability is an outcome of evolving zonal recirculations, with the North Equatorial Countercurrent (NECC) arising from the diversion of the northern branch of the South Equatorial Current (nSEC); the diversion begins in the eastern Atlantic and propagates west between April and August, following the Inter-Tropical Convergence Zone (ITCZ). The AAIW current field is largely affected by westward propagating anomalies, most visible near 3°S, 0°, 3°N and 7°N, which give rise to current reversals. Annual averaging produces the illusion of more (5 instead of 3) and slower (peak values about 0.03ms−1 instead of 0.1ms−1) jets than found on any month.
    Keywords latitude ; seasonal variation ; Antarctic region ; Atlantic Ocean
    Language English
    Dates of publication 2015-01
    Size p. 1-18.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0079-6611
    DOI 10.1016/j.pocean.2014.08.008
    Database NAL-Catalogue (AGRICOLA)

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  3. Article: Dataset on the RETRO-BMC cruise onboard the R/V Hespérides, April 2017, Brazil-Malvinas Confluence

    Orúe-Echevarría, Dorleta / Pelegrí, Josep L. / Castellanos, Paola / Guallar, Carles / Marotta, Humberto / Marrasé, Cèlia / Martín, Jacobo / Masdeu-Navarro, Marta / Paniagua, Guillermina F. / Peña-Izquierdo, Jesús / Puigdefábregas, Joan / Rodríguez-Fonseca, Belén / Roget, Elena / Rosell-Fieschi, Miquel / Salat, Jordi / Salvador, Joaquín / Vallès-Casanova, Ignasi / Vidal, Montserrat / Viúdez, Álvaro

    Data in Brief. 2020 June, v. 30

    2020  

    Abstract: This dataset, gathered during the RETRO-BMC cruise, reports multiple-scale measurements at the Confluence of the Brazil and Malvinas Currents. The cruise was carried out between 8 and 28 April 2017 onboard R/V Hespérides, departing from Ushuaia and ... ...

    Abstract This dataset, gathered during the RETRO-BMC cruise, reports multiple-scale measurements at the Confluence of the Brazil and Malvinas Currents. The cruise was carried out between 8 and 28 April 2017 onboard R/V Hespérides, departing from Ushuaia and arriving to Santos. Along its track, the vessel recorded near-surface temperature and salinity, as well as the horizontal flow from 20 m down to about 800 m. A total of 33 hydrographic stations were completed in a region off the Patagonian Shelf, within 41.2°S–35.9°S and out to 53.0°W. At each station, a multiparametric probe and velocity sensors were deployed inside the frame of a rosette used to collect water samples at selected depths; these samples were later used for several water analyses, including inorganic nutrient concentrations. Microstructure measurements were carried out in 11 of these hydrographic stations. In addition, two high-resolution three-dimensional surveys were conducted with an instrumented undulating vehicle between 40.6°S–39.0°S and 55.6°W–53.8°W. Lastly, eight high-frequency vertical profilers were deployed in the region and five position-transmitting drifters were launched. These data allow the description of the Confluence from the regional scale to the microscale, and provide a view of the variability of the frontal region on time scales from days to weeks.
    Keywords data collection ; microstructure ; salinity ; temperature ; Brazil ; Falkland Islands
    Language English
    Dates of publication 2020-06
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 2786545-9
    ISSN 2352-3409
    ISSN 2352-3409
    DOI 10.1016/j.dib.2020.105412
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  4. Article ; Online: Dataset on the RETRO-BMC cruise onboard the R/V Hespérides, April 2017, Brazil-Malvinas Confluence.

    Orúe-Echevarría, Dorleta / Pelegrí, Josep L / Castellanos, Paola / Guallar, Carles / Marotta, Humberto / Marrasé, Cèlia / Martín, Jacobo / Masdeu-Navarro, Marta / Paniagua, Guillermina F / Peña-Izquierdo, Jesús / Puigdefábregas, Joan / Rodríguez-Fonseca, Belén / Roget, Elena / Rosell-Fieschi, Miquel / Salat, Jordi / Salvador, Joaquín / Vallès-Casanova, Ignasi / Vidal, Montserrat / Viúdez, Álvaro

    Data in brief

    2020  Volume 30, Page(s) 105412

    Abstract: This dataset, gathered during the RETRO-BMC cruise, reports multiple-scale measurements at the Confluence of the Brazil and Malvinas Currents. The cruise was carried out between 8 and 28 April 2017 onboard R/V Hespérides, departing from Ushuaia and ... ...

    Abstract This dataset, gathered during the RETRO-BMC cruise, reports multiple-scale measurements at the Confluence of the Brazil and Malvinas Currents. The cruise was carried out between 8 and 28 April 2017 onboard R/V Hespérides, departing from Ushuaia and arriving to Santos. Along its track, the vessel recorded near-surface temperature and salinity, as well as the horizontal flow from 20 m down to about 800 m. A total of 33 hydrographic stations were completed in a region off the Patagonian Shelf, within 41.2°S-35.9°S and out to 53.0°W. At each station, a multiparametric probe and velocity sensors were deployed inside the frame of a rosette used to collect water samples at selected depths; these samples were later used for several water analyses, including inorganic nutrient concentrations. Microstructure measurements were carried out in 11 of these hydrographic stations. In addition, two high-resolution three-dimensional surveys were conducted with an instrumented undulating vehicle between 40.6°S-39.0°S and 55.6°W-53.8°W. Lastly, eight high-frequency vertical profilers were deployed in the region and five position-transmitting drifters were launched. These data allow the description of the Confluence from the regional scale to the microscale, and provide a view of the variability of the frontal region on time scales from days to weeks.
    Language English
    Publishing date 2020-03-21
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2786545-9
    ISSN 2352-3409 ; 2352-3409
    ISSN (online) 2352-3409
    ISSN 2352-3409
    DOI 10.1016/j.dib.2020.105412
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  5. Article: Dataset on the TIC-MOC cruise onboard the R/V Hespérides, March 2015, Brazil-Malvinas Confluence

    Orúe-Echevarría, Dorleta / Pelegrí, Josep L. / Alonso-González, Iván J. / Benítez-Barrios, Verónica M. / De La Fuente, Patricia / Emelianov, Mikhail / Gasser, Marc / Herrero, Carmen / Isern-Fontanet, Jordi / Peña-Izquierdo, Jesús / Ramírez-Garrido, Sergio / Rosell-Fieschi, Miquel / Salvador, Joaquín / Saraceno, Martín / Valla, Daniel / Vidal, Montserrat

    Data in Brief. 2019 Feb., v. 22

    2019  

    Abstract: This oceanographic dataset was gathered during the TIC-MOC cruise, which was designed to characterize the dynamics of the Brazil-Malvinas Confluence. The cruise was carried on board the R/V Hespérides, with departure from Ushuaia and arrival to Salvador ... ...

    Abstract This oceanographic dataset was gathered during the TIC-MOC cruise, which was designed to characterize the dynamics of the Brazil-Malvinas Confluence. The cruise was carried on board the R/V Hespérides, with departure from Ushuaia and arrival to Salvador de Bahía. A total of 66 conductivity-temperature-depth (CTD) stations were completed between 8 and 22 March 2015, offshore from the continental platform and within 45°S-35°S and 61°W-50°W. At each station, water samples were collected, which were used to calibrate the CTD salinity-oxygen sensors and to determine inorganic nutrient concentrations, and the horizontal current was measured. Along its track, the vessel recorded surface temperature and salinity, as well as the horizontal flow down to about 700 m. Lastly, eight position-transmitting drifters were launched and two profiling floats were deployed and later recovered.
    Keywords data collection ; salinity ; surface temperature
    Language English
    Dates of publication 2019-02
    Size p. 185-194.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 2786545-9
    ISSN 2352-3409
    ISSN 2352-3409
    DOI 10.1016/j.dib.2018.12.004
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  6. Article ; Online: Dataset on the TIC-MOC cruise onboard the R/V Hespérides, March 2015, Brazil-Malvinas Confluence.

    Orúe-Echevarría, Dorleta / Pelegrí, Josep L / Alonso-González, Iván J / Benítez-Barrios, Verónica M / De La Fuente, Patricia / Emelianov, Mikhail / Gasser, Marc / Herrero, Carmen / Isern-Fontanet, Jordi / Peña-Izquierdo, Jesús / Ramírez-Garrido, Sergio / Rosell-Fieschi, Miquel / Salvador, Joaquín / Saraceno, Martín / Valla, Daniel / Vidal, Montserrat

    Data in brief

    2018  Volume 22, Page(s) 185–194

    Abstract: This oceanographic dataset was gathered during the TIC-MOC cruise, which was designed to characterize the dynamics of the Brazil-Malvinas Confluence. The cruise was carried on board the R/V Hespérides, with departure from Ushuaia and arrival to Salvador ... ...

    Abstract This oceanographic dataset was gathered during the TIC-MOC cruise, which was designed to characterize the dynamics of the Brazil-Malvinas Confluence. The cruise was carried on board the R/V Hespérides, with departure from Ushuaia and arrival to Salvador de Bahía. A total of 66 conductivity-temperature-depth (CTD) stations were completed between 8 and 22 March 2015, offshore from the continental platform and within 45°S-35°S and 61°W-50°W. At each station, water samples were collected, which were used to calibrate the CTD salinity-oxygen sensors and to determine inorganic nutrient concentrations, and the horizontal current was measured. Along its track, the vessel recorded surface temperature and salinity, as well as the horizontal flow down to about 700 m. Lastly, eight position-transmitting drifters were launched and two profiling floats were deployed and later recovered.
    Language English
    Publishing date 2018-12-06
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2786545-9
    ISSN 2352-3409 ; 2352-3409
    ISSN (online) 2352-3409
    ISSN 2352-3409
    DOI 10.1016/j.dib.2018.12.004
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

To top