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  • 1
    facet.materialart.
    Unknown
    Biological and chemical water properties measured in water bottle samples during the cruise POS432 in Madeira basin in May 2012 (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Description: During the cruise POS432 on board the German R/V Poseidon, we collected water with a CTD SBE 11plus equipped with 14 Hydrobios free flow bottles of 10 L each in 15 stations (resulting in almost 100 samples) in the Madeira basin region, Northeast Atlantic. We aimed to study the physical and biogeochemical conditions of the water column along the 22°W meridian, north and south of the Azores Front, in May 2012. We measured concentrations of chlorophyll a, phaeopigments, suspended particulate material (SPM), and nutrients such as nitrate, nitrite, phosphate, and silicate.
    Keywords: Azores Front; biogeochemistry; Chlorophyll a; CTD, Sea-Bird, SBE 911plus; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; ELEVATION; Event label; fluorometer (ethanol extraction; GF/F-filtered) (Grasshoff et al., 1999); gravimetrically (GF/F-filtered) (Grasshoff et al., 1999); Longitude of event; Nitrate; Nitrite; Northeast Atlantic; Phaeopigments; Phosphate; POS432; POS432_118-2; POS432_119-1; POS432_120-1; POS432_121-1; POS432_124-1; POS432_125-1; POS432_126-3; POS432_128-1; POS432_129-1; POS432_131-1; POS432_132-1; POS432_133-1; POS432_136-1; POS432_137-1; POS432_138-1; Poseidon; Salinity; Silicate; Suspended particulate matter; Temperature, water; Water volume, filtered; wet chemical treatment; Continuous flow analysis (Grasshoff et al., 1999)
    Type: Dataset
    Format: text/tab-separated-values, 1020 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
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    Unknown
    Depth distribution and biomass of sublittoral seaweeds at the island of Helgoland in 2005 (2023)
    PANGAEA
    Details
    Publication Date: 2023-12-27
    Description: In 2005, the species composition and spatial distribution of the seaweed community were investigated in the frame of diving surveys along a sublittoral transect in the North of Helgoland that had been investigated ~40 years earlier by Lüning (1970). The cover of dominant brown seaweeds, Fucus serratus, Sargassum muticum, Laminaria digitata, L. hyperborea and Saccharina latissima, was semi-quantitatively assessed to define vegetation zones. Within each zone, all macroalgal species were estimated quantitatively in 3 to 6 random 1 m² quadrats. Additionally, a replicated biomass survey was performed at 6 depths (0.5, 2, 4, 6, 8 and 10 m below mean low water spring tide). The survey investigated the occurrence, cover and relative frequency of the algae community and information about fresh mass and dry mass were obtained. For kelps also stipe length, blade area, blade fresh mass, age and fresh mass of epiphytes was recorded.
    Keywords: algae community; Biomass; cover; distribution; fresh mass; Helgoland; kelp; leaf area index (LAI); Macroalgae; occurence; relative frequency
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Expected Availability
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    DATA PANGAEA
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