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  • 1
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    Lake or Sea? The Unknown Future of Central Baltic Sea Herring (2019)
    Frontiers Media
    Details
    Publication Date: 2019-04-30
    Electronic ISSN: 2296-701X
    Topics: Biology
    Published by Frontiers Media
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    PAPER CURRENT
  • 2
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    Impact of the azores front propagation on deep ocean particle flux (2012)
    De Gruyter
    Details
    Publication Date: 2012-01-01
    Description: The Azores Current originating as a branch of the Gulf Stream is a highly dynamic system in the subtropical North Atlantic. The associated front forms the northeastern boundary of the North Atlantic Subtropical Gyre. In this study we analyzed 42 years of assimilated modeled temperature fields to localize the position of the Azores Front at 22°W and observed a fast north- and southward propagation between 30°N and 37°N on monthly to decadal time scales. The North Atlantic Oscillation with correlated changes of the wind direction was identified as one driving mechanism. As the front is acting as a guide for Rossby waves, the signal of the front’s propagation is transferred to the western Atlantic and, among other atmospheric forcing mechanisms, induces a shifting of the Northern Wall of the Gulf Stream with one year delay. Shallower mixed layer depths in the northern frontal region of the Azores Current caused by the rise of the isotherms lead to nutrient supply and primary production different from those found in the southern frontal region of the current system. A high interannual variability is manifested in deep ocean particle flux, derived from a sediment trap in 2000 m water depth at the mooring site KIEL276 (33°N, 22°W) from 1993 to 2008, which is directly related to the phytoplankton bloom in the euphotic zone. This variability is explained by the propagation of the front and strong variations in the catchment areas of the sediment trap due to the associated eddy activity in the frontal region.
    Electronic ISSN: 2391-5447
    Topics: Geosciences
    Published by De Gruyter
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    PAPER CURRENT
  • 3
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    Impact of the azores front propagation on deep ocean particle flux (2012)
    De Gruyter
    In:  Open Geosciences, 4 (4). pp. 531-544.
    Details
    Publication Date: 2020-06-15
    Description: The Azores Current originating as a branch of the Gulf Stream is a highly dynamic system in the subtropical North Atlantic. The associated front forms the northeastern boundary of the North Atlantic Subtropical Gyre. In this study we analyzed 42 years of assimilated modeled temperature fields to localize the position of the Azores Front at 22°W and observed a fast north- and southward propagation between 30°N and 37°N on monthly to decadal time scales. The North Atlantic Oscillation with correlated changes of the wind direction was identified as one driving mechanism. As the front is acting as a guide for Rossby waves, the signal of the front’s propagation is transferred to the western Atlantic and, among other atmospheric forcing mechanisms, induces a shifting of the Northern Wall of the Gulf Stream with one year delay. Shallower mixed layer depths in the northern frontal region of the Azores Current caused by the rise of the isotherms lead to nutrient supply and primary production different from those found in the southern frontal region of the current system. A high interannual variability is manifested in deep ocean particle flux, derived from a sediment trap in 2000 m water depth at the mooring site KIEL276 (33°N, 22°W) from 1993 to 2008, which is directly related to the phytoplankton bloom in the euphotic zone. This variability is explained by the propagation of the front and strong variations in the catchment areas of the sediment trap due to the associated eddy activity in the frontal region.
    Type: Article , PeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 4
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    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: 2023-03-03
    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
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    DATA PANGAEA
  • 5
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    Physical oceanography during the cruise POS432 in the Madeira basin in May 2012 (2022)
    PANGAEA
    Details
    Publication Date: 2023-03-03
    Description: This set provides 19 CTD profiles of temperature, salinity, dissolved oxygen, fluorescence, turbidity and sound velocity measured on board of the German R/V Poseidon in May 2012, 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. The biogeochemical data associated to this dataset can be found in doi:10.1594/PANGAEA.946626
    Keywords: Azores Front; Calculated; Chlorophyll a; Conductivity; CTD, Sea-Bird, SBE 911plus; CTD/Rosette; CTD-RO; Date/Time of event; Density, potential; DEPTH, water; Event label; Fluorometer/turbidity meter, WET Labs ECO FLNTU; Latitude of event; Longitude of event; Northeast Atlantic; Oxygen, dissolved; Oxygen saturation, per unit volume of the liquid; physical oceanography; POS432; POS432_118-1; POS432_118-2; POS432_119-1; POS432_120-1; POS432_121-1; POS432_122-1; POS432_124-1; POS432_125-1; POS432_126-1; 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; Pressure, water; Salinity; Sound velocity in water; Temperature, water; Turbidity (Nephelometric turbidity unit)
    Type: Dataset
    Format: text/tab-separated-values, 440944 data points
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    DATA PANGAEA
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