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  • ADCP; B_LANDER; Bottom lander; CTD profiles; current velocity; German Bight; HE510; HE510_24-1; Heincke; NOAH; North Sea; North Sea Observation and Assessment of Habitats; SEDOBS; tidal cycle  (1)
  • Baltic Sea  (1)
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  • 1
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    ADCP current velocity and CTD measurements at lander stations during HE510 in the German Bight (2022)
    PANGAEA
    Details
    Publication Date: 2024-01-12
    Description: Data sets contain profiles of horizontal current velocity, temperature, and salinity collected during R/V Heincke cruise HE510 in May 2018 at two locations in the German Bight: at site NOAHC and site Outer Weser (OW). Current velocities were measured by an uplooking 600 kHz RDI ADCP, which was mounted on the SEDOBS lander. ADCP transducers were located 2.2 m above the seabed. The original ping rate (mode 1) was 0.25 s-1, averaging 4 sub-pings. Data is averaged over 10 min. The cell size is 0.3 m, averaged over 1 m intervals. The vertical reference is 'meter above bed' (mab). Time is UTC. Each file contains data of one deployment (location), whereas the lander was deployed for at least 1.5 tidal cycles at each location. CTD profiles were taken during part of the lander deployment period from the anchored ship nearby and are exported on the same grid as the ADCP measurements.
    Keywords: ADCP; B_LANDER; Bottom lander; CTD profiles; current velocity; German Bight; HE510; HE510_24-1; Heincke; NOAH; North Sea; North Sea Observation and Assessment of Habitats; SEDOBS; tidal cycle
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Interleaving of oxygenized intrusions into the Baltic Sea redoxcline (2021)
    Details
    Publication Date: 2021-11-03
    Description: Semi-enclosed marginal seas like the Baltic Sea are often characterized by permanently anoxic deep layers, and may therefore serve as important model systems to study the causes and consequences of the predicted global expansion of oxygen minimum zones. Here, we focus on the role of lateral intrusions in maintaining the “hypoxic transition zone” (HTZ) of the Baltic Sea, which characterizes the quasi-permanent hypoxic region located between the oxygenized surface layer and the sulfidic deep-water region. Based on long-term deployments of an autonomous profiling system in the central Baltic Sea, we show that oxic mid-water intrusions are ubiquitous features, providing the most important oxygen source for the HTZ, and largely control the vertical and lateral extent of the hypoxic areas. An oxygen budget for the HTZ suggests that oxygen turnover in the HTZ is, to first order, determined by a long-term balance between sedimentary oxygen demand and oxygen import by intrusions. The downward mixing of oxygen into the HTZ is generally non-negligible but unlikely to provide a first-order contribution to the HTZ oxygen budget. On the long-term average, mid-water intrusions were shown to inject 30–60 Gmol of oxygen per year into the deep-water region below the permanent halocline. This is approximately one order of magnitude larger than the average amount of oxygen imported during the massive deep-water inflow events (Major Baltic Inflows) that occur on an approximately decadal time scale, highlighting the HTZ as a hotspot for biogeochemical turnover.
    Keywords: 551.46 ; Baltic Sea ; hydrography ; hypoxic transistion zone (HTZ) ; biogeochemical turnover
    Language: English
    Type: map
    Location Call Number Limitation Availability
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    CITATION GEO-LEO
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