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  • 1
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    The occurrence of Sparisoma frondosum (Teleostei: Labridae) in the Cape Verde Archipelago, with a summary of expatriated Brazilian endemic reef fishes (2014)
    Springer
    Details
    Publication Date: 2014-02-21
    Print ISSN: 1867-1616
    Electronic ISSN: 1867-1624
    Topics: Biology
    Published by Springer
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    PAPER CURRENT
  • 2
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    In Situ CO2and O2Measurements on a Profiling Float (2013)
    American Meteorological Society
    Details
    Publication Date: 2013-01-01
    Print ISSN: 0739-0572
    Electronic ISSN: 1520-0426
    Topics: Geography , Geosciences , Physics
    Published by American Meteorological Society
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  • 3
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    Oxygen utilization and downward carbon flux in an oxygen-depleted eddy in the eastern tropical North Atlantic (2016)
    Copernicus
    Details
    Publication Date: 2016-10-10
    Description: The occurrence of mesoscale eddies that develop suboxic environments at shallow depth (about 40–100 m) has recently been reported for the eastern tropical North Atlantic (ETNA). Their hydrographic structure suggests that the water mass inside the eddy is well isolated from ambient waters supporting the development of severe near-surface oxygen deficits. So far, hydrographic and biogeochemical characterization of these eddies was limited to a few autonomous surveys, with the use of moorings, underwater gliders and profiling floats. In this study we present results from the first dedicated biogeochemical survey of one of these eddies conducted in March 2014 near the Cape Verde Ocean Observatory (CVOO). During the survey the eddy core showed oxygen concentrations as low as 5 µmol kg−1 with a pH of around 7.6 at approximately 100 m depth. Correspondingly, the aragonite saturation level dropped to 1 at the same depth, thereby creating unfavorable conditions for calcifying organisms. To our knowledge, such enhanced acidity within near-surface waters has never been reported before for the open Atlantic Ocean. Vertical distributions of particulate organic matter and dissolved organic matter (POM and DOM), generally showed elevated concentrations in the surface mixed layer (0–70 m), with DOM also accumulating beneath the oxygen minimum. With the use of reference data from the upwelling region where these eddies are formed, the oxygen utilization rate was calculated by determining oxygen consumption through the remineralization of organic matter. Inside the core, we found these rates were almost 1 order of magnitude higher (apparent oxygen utilization rate (aOUR); 0.26 µmol kg−1 day−1) than typical values for the open North Atlantic. Computed downward fluxes for particulate organic carbon (POC), were around 0.19 to 0.23 g C m−2 day−1 at 100 m depth, clearly exceeding fluxes typical for an oligotrophic open-ocean setting. The observations support the view that the oxygen-depleted eddies can be viewed as isolated, westwards propagating upwelling systems of their own, thereby represent re-occurring alien biogeochemical environments in the ETNA.
    Print ISSN: 1726-4170
    Electronic ISSN: 1726-4189
    Topics: Biology , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 4
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    In situ CO2 and O2 measurements on a profiling float (2013)
    AMS (American Meteorological Society)
    In:  Journal of Atmospheric and Oceanic Technology, 30 . pp. 112-126.
    Details
    Publication Date: 2020-08-04
    Description: In recent years, profiling floats, which form the basis of the successful international Argo observatory, are also being considered as platforms for marine biogeochemical research. This study showcases the utility of floats as a novel tool for combined gas measurements of CO2 partial pressure (pCO2) and O2. These float prototypes were equipped with a small-sized and submersible pCO2 sensor and an optode O2 sensor for high resolution measurements in the surface ocean layer. Four consecutive deployments were carried out during Nov. 2010 and June 2011 near the Cape Verde Ocean Observatory (CVOO) in the eastern tropical North Atlantic. The profiling float performed upcasts every 31 h while measuring pCO2, O2, salinity, temperature and hydrostatic pressure in the upper 200 m of the water column. In order to maintain accuracy, regular pCO2 sensor zeroings at depth and surface, as well as optode measurements in air, were performed for each profile. Through the application of data processing procedures (e.g., time-lag correction) accuracies of float-borne pCO2 measurements were greatly improved (10 – 15 μatm for water column and 5 μatm for surface measurements). O2 measurements yielded an accuracy of 2 μmol kg−1. First results of this pilot study show the possibility of using profiling floats as a platform for detailed and unattended observations of the marine carbon and oxygen cycle dynamics.
    Type: Article , PeerReviewed
    Format: text
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  • 5
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    Intra-annual variability of biological, chemical and physical parameters at the Senghor seamount Cruise No. MSM61 18.02.2017 – 27.02.2017, Mindelo (Cabo Verde) – Las Palmas (Spain) (2020)
    Gutachterpanel Forschungsschiffe
    Details
    Publication Date: 2023-09-19
    Description: The main goal of cruise MSM61 was to install an autonomous multidisciplinary observatory at the summit of Senghor Seamount off the Cape Verdean archipelago. A suite of different mobile and moored instrument platforms equipped with physical, biological and biogeochemical instruments was deployed during the cruise in order to investigate spatio-temporal variability of physical and biogeochemical conditions and how these affect the local ecosystem at this openocean seamount. The research program further included hydrographic work, biological and biogeochemical sampling as well as video transects in the meso- and bathypelagic zones both at Senghor Seamount and at the Cape Verde Ocean Observatory (CVOO).
    Type: Report , NonPeerReviewed
    Format: text
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  • 6
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    Distribution and biomass of gelatinous zooplankton in relation to an oxygen minimum zone and a shallow seamount in the Eastern Tropical North Atlantic Ocean (2022)
    Elsevier
    Details
    Publication Date: 2024-02-07
    Description: Highlights: • Gelatinous zooplankton (GZ) is common in Eastern Tropical North Atlantic (ETNA). • Weak negative correlation between oxygen and key GZ groups with higher densities at lower oxygen conditions. • High GZ biomass also found at lowest oxygen concentration depths. • Strong positive correlation between temperature and key GZ group abundance. • GZ important component of oceanic ecosystems including low oxygenated waters. Physical and topographic characteristics can structure pelagic habitats and affect the plankton community composition. For example, oxygen minimum zones (OMZs) are expected to lead to a habitat compression for species with a high oxygen demand, while upwelling of nutrient-rich deep water at seamounts can locally increase productivity, especially in oligotrophic oceanic waters. Here we investigate the response of the gelatinous zooplankton (GZ) assemblage and biomass to differing oxygen conditions and to a seamount in the Eastern Tropical North Atlantic (ETNA) around the Cape Verde archipelago. A total of 16 GZ taxa (〉1100 specimens) were found in the upper 1000 m with distinct species-specific differences, such as the absence of deep-living species Atolla wyvillei and Periphylla periphylla above the shallow seamount summit. Statistical analyses considering the most prominent groups, present at all stations, namely Beroe spp., hydromedusae (including Zygocanna vagans, Halicreas minimum, Colobonema sericeum, Solmissus spp.) and total GZ, showed a strong positive correlation of abundance with temperature for all groups, whereas oxygen had a weak negative correlation only with abundances of Beroe spp. and hydromedusae. To account for size differences between species, we established length-weight regressions and investigated total GZ biomass changes in relation to physical (OMZ) and topographic characteristics. The highest GZ biomass was observed at depths of lowest oxygen concentrations and deepest depth strata at the southeastern flank of the seamount and at two stations south of the Cape Verde archipelago. Our data suggest that, irrespective of their patchy distribution, GZ organisms are ubiquitous food web members of the ETNA, and their habitat includes waters of low oxygen content.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: other
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  • 7
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    Processed CO2/O2 Float data from 4 deployments near Cape Verde Island (11/2010 - 06/2011) (2013)
    PANGAEA
    In:  Supplement to: Fiedler, Björn; Fietzek, Peer; Vieira, Nuno; Silva, Pericles; Bittig, Henry; Körtzinger, Arne (2013): In Situ CO2 and O2 Measurements on a Profiling Float. Journal of Atmospheric and Oceanic Technology, 30(1), 112-126, https://doi.org/10.1175/JTECH-D-12-00043.1
    Details
    Publication Date: 2024-02-01
    Description: In recent years, profiling floats, which form the basis of the successful international Argo observatory, are also being considered as platforms for marine biogeochemical research. This study showcases the utility of floats as a novel tool for combined gas measurements of CO2 partial pressure (pCO2) and O2. These float prototypes were equipped with a small-sized and submersible pCO2 sensor and an optode O2 sensor for highresolution measurements in the surface ocean layer. Four consecutive deployments were carried out during November 2010 and June 2011 near the Cape Verde Ocean Observatory (CVOO) in the eastern tropical North Atlantic. The profiling float performed upcasts every 31 h while measuring pCO2, O2, salinity, temperature, and hydrostatic pressure in the upper 200 m of the water column. To maintain accuracy, regular pCO2 sensor zeroings at depth and surface, as well as optode measurements in air, were performed for each profile. Through the application of data processing procedures (e.g., time-lag correction), accuracies of floatborne pCO2 measurements were greatly improved (10-15 µatm for the water column and 5 µatm for surface measurements). O2 measurements yielded an accuracy of 2 µmol/kg. First results of this pilot study show the possibility of using profiling floats as a platform for detailed and unattended observations of the marine carbon and oxygen cycle dynamics.
    Keywords: Carbon dioxide, partial pressure; CVOO Floater; DATE/TIME; deployment_d4; deployment_d5; deployment_d6; deployment_d7; DEPTH, water; Event label; LATITUDE; LONGITUDE; Nemo float; NFLOAT; off Cape Verde Islands; Oxygen; Pressure, water; Profile; Salinity; SOPRAN; Surface Ocean Processes in the Anthropocene; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 509900 data points
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    DATA PANGAEA
  • 8
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    Ship-based biogeochemical bottle data from the CVOO time series (2006-2019) in the Eastern Tropical North Atlantic (2023)
    PANGAEA
    Details
    Publication Date: 2024-02-27
    Description: This dataset compiles all available ship-based biogeochemical measurements at the Cape Verde Ocean Observatory (CVOO) into one merged dataset. The irregular measurements at CVOO started in 2006 and are still ongoing aiming at increasing data coverage in a key region for air-sea interaction. The station has a bottom depth of 3600 m and lies in the center of the Cape Verde Fontal Zone, resulting in large variations of the present oligotrophic water masses as well as an oxygen-poor layer between 400 m to 500 m. The dataset includes oxygen, nutrients, dissolved inorganic carbon, total alkalinity, and particulate organic matter measurements, and ancillary ctd-data are also included. The research vessels used and the exact measurement methods as well as the laboratories varied on a cruise-to-cruise basis, accordingly the data has undergone additional quality-control checks. The checks included flier detection (WOCE-flagging) and crossover-analysis that resulted in bias corrections.
    Keywords: 06MT20060714; 1001; 109434; 109626; 16; 2001; 23-10; AIMAC; Alkalinity, total; Ammonium; ANT-XXX/1.2; AT08_4-CTD51; ATA08_03; ATA08_04; ATA3_40-1; Bio-CTD 3; Bottle number; Cape Verde; CARBOCHANGE; Carbon, organic, particulate; Carbon, total; CARBOOCEAN; CARO; Cast number; Changes in the carbon uptake and emissions by oceans in a changing climate; Climate - Biogeochemistry Interactions in the Tropical Ocean; Cruise/expedition; CTD; CTD_1; CTD_104; CTD_105/106/107; CTD_2; CTD_3; CTD_4; CTD_5; CTD_6; CTD/Rosette; CTD001; CTD 001; CTD002; CTD 002; CTD003; CTD 003; CTD1; CTD 115; CTD128; CTD129; CTD14; CTD15; CTD16; CTD2; CTD3; CTD4; CTD61; CTD 81; CTD 82; CTD-RO; DATE/TIME; Eastern Tropical North Atlantic; EuroSea; Event label; iAtlantic; IFM-GEOMAR/3; IFM-GEOMAR/4; Improving and Integrating European Ocean Observing and Forecasting Systems for Sustainable use of the Oceans; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; ISL_00112_1; ISL_00112_1-1; ISL_00112_1-2; ISL_00113; ISL_00113_1-1; ISL_00311_1; ISL_00311_1-1; ISL_00414; ISL_00414_1-1; ISL_00414_2-1; ISL_00511_1; ISL_00511_1-1; ISL_00511_1-2; ISL_00512; ISL_00512_1-1; ISL_00514; ISL_00514_1-1; ISL_00514_2_1; ISL_00514_3_1; ISL_00611_1; ISL_00611_1-1; ISL_00611_1-2; ISL_00612; ISL_00612_1-1; ISL_00713; ISL_00713_1-1; ISL_00713_2-1; ISL_01212_1; ISL_01212_2-1; ISL_01412_1; ISL_01412_1-1; ISL_01412_1-2; ISL_01512; ISL_01512_1-1; Islandia; L Atalante; LATITUDE; LONGITUDE; M105; M105_191-2; M106; M106_322-2; M106_322-3; M106_322-5; M116/1; M116/1_554-1; M116/1_555-1; M119; M119_684-1; M119_686-1; M119_692-1; M130; M130_933-1; M130_935-1; M130_939-1; M130_941-1; M130_944-1; M130_945-1; M130_947-1; M145; M145_2-1; M145_3-1; M145_4-1; M160; M160_119-1; M160_121-1; M68/2; M68/2_255; M68/3; M68/3_261-2; M68/3_261-3; M68/3_261-4; M80/1; M80/1-CTD1; M80/1-CTD2; M83/1; M83/1_772; M83/1_776; M97; M97_1089-1; M97_1094-1; Maria S. Merian; Marine carbon sources and sinks assessment; Meteor (1986); MSM08/1; MSM08/1_CTD-RO1; MSM10/1; MSM10/1-CTD229; MSM18/2; MSM18/2_615-4; MSM18/2_615-6; MSM18/3; MSM18/3_721-1; MSM22; MSM22_673-10; MSM22_673-2b; MSM22_673-5; MSM22_673-8; MSM22_751-3; MSM22_751-6; MSM23; MSM23_760-2; MSM49; MSM49_583-1; MSM49_583-12; MSM61; MSM61_471-2; MSM68/2; MSM68/2_3-1; Nitrate; Nitrite; Nitrogen, organic, particulate; OSTRE_IV; Oxygen; Phosphate; Phosphorus, organic, particulate; Polarstern; POS348; POS348_227-1; POS348_227-2; POS399/2; POS399/2_307-3; POS399/2_307-6; POS399/2_307-7; POS520; POS520_65-1; POS520_65-2; POS532; POS532_28-2; POS532_28-4; POS532_28-5; POS532_28-6; POS533_28-3; POS533_28-4; POS533/1; Poseidon; Pressure, water; PS88/004-1; PS88.2; Quality flag; Quality flag, alkalinity, total; Quality flag, ammonium; Quality flag, carbon, organic, particulate; Quality flag, nitrate; Quality flag, nitrite; Quality flag, nitrogen, organic, particulate; Quality flag, oxygen; Quality flag, phosphate; Quality flag, salinity; Quality flag, silicic acid; REEBUS; Reference of data; Role of Eddies for the Carbon Pump in Coastal upwelling Areas; Salinity; SALINO; Salinometer; Sample code/label; SFB754; ship-based; Silicate; SOPRAN; South Atlantic Ocean; Station label; Surface Ocean Processes in the Anthropocene; T-CTD 2; Temperature, water; Time-Series Data; Titration, Winkler
    Type: Dataset
    Format: text/tab-separated-values, 34378 data points
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    DATA PANGAEA
  • 9
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    Images of pelagic organisms observed by PELAGIOS during Maria S. Merian cruise MSM49 (2020)
    PANGAEA
    Details
    Publication Date: 2024-04-17
    Description: The video that was collected in November and December 2015 during horizontal transects with the PELAGIOS towed camera system during cruise MSM49 in waters around Cabo Verde in the eastern tropical north Atlantic was annotated using the video and annotation reference system (VARS) developed by the Monterey Bay Aquarium Research Institute. In total more than 40 hours of video were collected and annotated, and 43 taxonomic groups were annotated, mostly consisting of gelatinous zooplankton. This resulted in a dataset of diversity and abundance data from which vertical distribution, abundance and diversity of pelagic fauna could be derived (https://doi.pangaea.de/10.1594/PANGAEA.919333). This dataset provides examples of images of annotated organisms.
    Keywords: Cape Verde; Date/Time of event; Deep sea; Event label; File format; File name; File size; gelatinous zooplankton; iAtlantic; in situ observations; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; Latitude of event; Longitude of event; Maria S. Merian; micronekton; MSM49; MSM49_583-11; MSM49_583-9; MSM49_584-3; MSM49_586-4b; MSM49_586-7; MSM49_603-14; MSM49_603-4; MSM49_604-9; oxygen minimum zone; Pelagic In situ Observation System PELAGIOS; PELAGIOS; South Atlantic Ocean; Species; Uniform resource locator/link to image
    Type: Dataset
    Format: text/tab-separated-values, 1170 data points
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  • 10
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    Annotation data of video collected during Maria S. Merian cruise MSM49 with the pelagic in situ observation system (PELAGIOS) (2020)
    PANGAEA
    Details
    Publication Date: 2024-04-17
    Description: Pelagic observations were collected via horizontal video transects using the pelagic in situ observation system PELAGIOS from 50-1000 m during MSM49. The collected video was annotated using the video and annotation reference system (VARS) developed by the Monterey Bay Aquarium Research Institute. In total more than 40 hours of video were collected and annotated, and 43 taxonomic groups were annotated, mostly consisting of gelatinous zooplankton.
    Keywords: Cape Verde; Deep sea; gelatinous zooplankton; iAtlantic; in situ observations; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; micronekton; oxygen minimum zone
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
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