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  • 1
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    Unknown
    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
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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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
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Unknown
    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
    DOI: 10.1175/JTECH-D-12-00043.1
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Unknown
    Upwelling and isolation in oxygen-depleted anticyclonic modewater eddies and implications for nitrate cycling (2017)
    Copernicus Publications (EGU)
    In:  Biogeosciences (BG), 14 (8). pp. 2167-2181.
    Details
    Publication Date: 2020-02-06
    Description: The temporal evolution of the physical and biogeochemical structure of an oxygen-depleted anticyclonic modewater eddy is investigated over a 2-month period using high-resolution glider and ship data. A weakly stratified eddy core (squared buoyancy frequency N2  ∼  0.1  ×  10−4 s−2) at shallow depth is identified with a horizontal extent of about 70 km and bounded by maxima in N2. The upper N2 maximum (3–5  ×  10−4 s−2) coincides with the mixed layer base and the lower N2 maximum (0.4  ×  10−4 s−2) is found at about 200 m depth in the eddy centre. The eddy core shows a constant slope in temperature/salinity (T∕S) characteristic over the 2 months, but an erosion of the core progressively narrows down the T∕S range. The eddy minimal oxygen concentrations decreased by about 5 µmol kg−1 in 2 months, confirming earlier estimates of oxygen consumption rates in these eddies. Separating the mesoscale and perturbation flow components reveals oscillating velocity finestructure ( ∼  0.1 m s−1) underneath the eddy and at its flanks. The velocity finestructure is organized in layers that align with layers in properties (salinity, temperature) but mostly cross through surfaces of constant density. The largest magnitude in velocity finestructure is seen between the surface and 140 m just outside the maximum mesoscale flow but also in a layer underneath the eddy centre, between 250 and 450 m. For both regions a cyclonic rotation of the velocity finestructure with depth suggests the vertical propagation of near-inertial wave (NIW) energy. Modification of the planetary vorticity by anticyclonic (eddy core) and cyclonic (eddy periphery) relative vorticity is most likely impacting the NIW energy propagation. Below the low oxygen core salt-finger type double diffusive layers are found that align with the velocity finestructure. Apparent oxygen utilization (AOU) versus dissolved inorganic nitrate (NO3−) ratios are about twice as high (16) in the eddy core compared to surrounding waters (8.1). A large NO3− deficit of 4 to 6 µmol kg−1 is determined, rendering denitrification an unlikely explanation. Here it is hypothesized that the differences in local recycling of nitrogen and oxygen, as a result of the eddy dynamics, cause the shift in the AOU : NO3− ratio. High NO3− and low oxygen waters are eroded by mixing from the eddy core and entrain into the mixed layer. The nitrogen is reintroduced into the core by gravitational settling of particulate matter out of the euphotic zone. The low oxygen water equilibrates in the mixed layer by air–sea gas exchange and does not participate in the gravitational sinking. Finally we propose a mesoscale–submesoscale interaction concept where wind energy, mediated via NIWs, drives nutrient supply to the euphotic zone and drives extraordinary blooms in anticyclonic mode-water eddies.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    DOI: 10.5194/bg-2016-34
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Unknown
    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
    DOI: 10.48433/cr_msm61
    Location Call Number Limitation Availability
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    OceanRep: Report - Cruise Report
  • 6
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    Resistance exercise leading to failure versus not to failure: effects on cardiovascular control (2013)
    BioMed Central
    Details
    Publication Date: 2013-11-20
    Description: Background: The aim of the present study was to evaluate the acute effects of resistance exercise (RE) leading to failure and RE that was not to failure on 24 h blood pressure (BP) and heart rate variability (HRV) in sedentary normotensive adult women. Methods: Ten women (33.2 +/- 5.8 years; 159.3 +/- 9.4 cm; 58.0 +/-6.4 kg; body fat 28.4 +/- 2.8%) randomly underwent three experimental sessions: control (40 minutes of seated rest), RE leading to failure with 3 sets of 10 repetitions maximum (10-RM), and RE not to failure at 60% of 10-RM with 3 sets of 10 repetitions. Immediately post session BP and HRV were measured for 24 h. Results: Ratings of perceived exertion and heart rate were higher during the 10-RM session when compared with 60% of 10-RM (6.4 +/- 0.5 vs 3.5 +/- 0.8 and 123.7 +/- 13.9 vs 104.5 +/- 7.3 bpm, respectively). The systolic, diastolic and mean BP decreased at 07:00 a.m. after the 10-RM session when compared with the control session (-9.0 +/- 7.8 mmHg, -16.0 +/- 12.9 mmHg and -14.3 +/- 11.2 mmHg, respectively). The root mean square of the squared differences between R-R intervals decreased after both the 60% of 10-RM and 10-RM sessions compared with the control session. Conclusions: An acute RE session leading to failure induced a higher drop of BP upon awakening, while both RE sessions reduced cardiac parasympathetic modulation. RE may be an interesting training strategy to acutely decrease BP in adult women.
    Electronic ISSN: 1471-2261
    Topics: Medicine
    Published by BioMed Central
    Location Call Number Limitation Availability
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    PAPER CURRENT
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