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  • 1
    Online Resource
    Online Resource
    Geochemistry and Ecology of the Namibian Upwelling System : GENUS II Abschlussbericht : Einfluss des Klimawandels auf biogeochemische Zyklen und ökologische Prozesse im Schelfgebiet des Südostatlantiks : Phase II : Projektlaufzeit: 01.05.2012-31.07.2015 (2015)
    Geesthacht : [Helmholtz-Zentrum Geesthacht, Institut für Küstenforschung]
    Details Availability
    Keywords: Forschungsbericht ; Klimaänderung ; Benguelastrom ; Schelfmeer ; Auftriebsgebiet ; Meeresökologie ; Biogeochemie
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (167 Seiten,10,99 MB) , Illustrationen, Diagramme
    URL: https://edocs.tib.eu/files/e01fb16/866049673.pdf
    URL: https://doi.org/10.2314/GBV:866049673
    DOI: 10.2314/GBV:866049673
    Language: German
    Note: Förderkennzeichen BMBF 03F0650A-F. - Verbund-Nummer 01112905 , Enthält 7 Teilprojekte , "Eingebunden in die SPACES-Initiative des BMBF, Beitrag zum internationalen IMBER-Projekt, Partner der Benguela Current Commission" - Blatt I , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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  • 2
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    The Inflow of Highly Saline Water into the Baltic Sea (2008)
    Wiley
    In:  In: State and Evolution of the Baltic Sea, 1952-2005: A Detailed 50-year Survey of Meteorology and Climate, Physics, Chemistry, Biology, and Marine Environment. , ed. by Feistel , R., Nausch , G. and Wasmund , N. Wiley, Hoboken, pp. 265-309.
    Details
    Publication Date: 2017-11-24
    Type: Book chapter , NonPeerReviewed
    Format: text
    DOI: 10.1002/9780470283134.ch10
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    OceanRep: Book chapter
  • 3
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    Coastal Trapped Wave Propagation along the Southwest African Shelf as Revealed by Moored Observations (2019)
    AMS (American Meteorological Society)
    In:  Journal of Physical Oceanography, 49 (3). pp. 851-866.
    Details
    Publication Date: 2022-01-31
    Description: Coastal trapped waves (CTWs) that propagate poleward along the southwest African shelf potentially leak energy from lower latitudes into the Benguela Upwelling System (BUS). Thus, in addition to local winds, these waves provide an important remote forcing mechanism for the upwelling region. The present study aims at elucidating the nature of CTWs in the northern BUS. To this end, we make use of multisite velocity observations from the Namibian shelf (18°, 20°, 23°S) and examine the alongshore velocity signal for signatures of CTWs by means of wavelet methods. We found that a substantial amount of energy is concentrated within a submonthly to subseasonal frequency band (10–50 days). Based on the coherence and phase spectra of the alongshelf currents, we provide evidence for a predominantly southward phase propagation and establish typical time and length scales of CTWs in the region. It turns out that their properties differ significantly within a few hundred kilometers along the coast. A comparison of the results with theoretical dispersion curves shows that this difference may be explained by variations in the bottom topography. Finally, we investigate the coupling of the alongshore currents with the coastal and equatorial wind stress and highlight regions of potential wave generation.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1175/JPO-D-18-0046.1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    On the Along‐Slope Heat Loss of the Boundary Current in the Eastern Arctic Ocean (2021)
    AGU (American Geophysical Union) | Wiley
    Details
    Publication Date: 2024-02-07
    Description: This study presents recent observations to quantify oceanic heat fluxes along the continental slope of the Eurasian part of the Arctic Ocean, in order to understand the dominant processes leading to the observed along-track heat loss of the Arctic Boundary Current (ABC). We investigate the fate of warm Atlantic Water (AW) along the Arctic Ocean continental margin of the Siberian Seas based on 11 cross-slope conductivity, temperature, depth transects and direct heat flux estimates from microstructure profiles obtained in summer 2018. The ABC loses on average urn:x-wiley:21699275:media:jgrc24332:jgrc24332-math-0006(108) J m−2 per 100 km during its propagation along the Siberian shelves, corresponding to an average heat flux of 47 W m−2 out of the AW layer. The measured vertical heat flux on the upper AW interface of on average 10 W m−2 in the deep basin, and 3.7 W m−2 above the continental slope is larger than previously reported values. Still, these heat fluxes explain less than 20% of the observed heat loss within the boundary current. Heat fluxes are significantly increased in the turbulent near-bottom layer, where AW intersects the continental slope, and at the lee side of a topographic irregularity. This indicates that mixing with ambient colder water along the continental margins is an important contribution to AW heat loss. Furthermore, the cold halocline layer receives approximately the same amount of heat due to upward mixing from the AW, compared to heat input from the summer-warmed surface layer above. This underlines the importance of both surface warming and increased vertical mixing in a future ice-free Arctic Ocean in summer.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    The relation of wind-driven coastal and offshore upwelling in the Benguela Upwelling System (2021)
    AMS (American Meteorological Society)
    Details
    Publication Date: 2024-02-07
    Description: Spatial and temporal variations of nutrient-rich upwelled water across the major eastern boundary upwelling systems are primarily controlled by the surface wind with different, and sometimes contrasting, impacts on coastal upwelling systems driven by alongshore wind and offshore upwelling systems driven by the local wind-stress-curl. Here, concurrently measured wind-fields, satellite-derived Chlorophyll-a concentration along with a state-of-the-art ocean model simulation spanning 2008-2018 are used to investigate the connection between coastal and offshore physical drivers of the Benguela Upwelling System (BUS). Our results indicate that the spatial structure of long-term mean upwelling derived from Ekman theory and the numerical model are fairly consistent across the entire BUS and closely followed by the Chlorophyll-a pattern. The variability of the upwelling from the Ekman theory is proportionally diminished with offshore distance, whereas different and sometimes opposite structures are revealed in the model-derived upwelling. Our result suggests the presence of sub-mesoscale activity (i.e., filaments and eddies) across the entire BUS with a large modulating effect on the wind-stress-curl-driven upwelling off Lüderitz and Walvis Bay. In Kunene and Cape Frio upwelling cells, located in the northern sector of the BUS, the coastal upwelling and open-ocean upwelling frequently alternate each other, whereas they are modulated by the annual cycle and mostly in phase off Walvis Bay. Such a phase relationship appears to be strongly seasonally dependent off Lüderitz and across the southern BUS. Thus, our findings suggest this relationship is far more complex than currently thought and seems to be sensitive to climate changes with short- and far-reaching consequences for this vulnerable marine ecosystem.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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