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  • 1
    Online Resource
    Online Resource
    The North Atlantic ocean in the greenhouse : overturning response and sensitivities (2003)
    Details Availability
    Keywords: Hochschulschrift ; Atlantischer Ozean Nord ; Treibhauseffekt
    Description / Table of Contents: Zs.-Fassung ; Abstract
    Type of Medium: Online Resource
    Pages: Online-Ressource (147 S. = 8.52 MB, Text) , Ill., graph. Darst., Kt
    Edition: [Electronic ed.]
    URL: http://nbn-resolving.de/urn:nbn:de:gbv:8-diss-9281
    URL: http://eldiss.uni-kiel.de/macau/receive/dissertation_diss_928
    URN: urn:nbn:de:gbv:8-diss-9281
    Language: English
    Note: Kiel, Univ., Diss., 2003
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  • 2
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    Energetische Umwandlungsterme in einem Nordatlantik-Modell (2000)
    In:  (Diploma thesis), Christian-Albrechts-Universität, Kiel, 73 pp
    Details
    Publication Date: 2018-03-20
    Type: Thesis , NonPeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Thesis - not published by a publisher
  • 3
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    Is the thermohaline circulation changing? (2006)
    AMS (American Meteorological Society)
    In:  Journal of Climate, 19 (18). pp. 4631-4637.
    Details
    Publication Date: 2020-08-04
    Description: Analyses of ocean observations and model simulations suggest that there have been considerable changes in the thermohaline circulation (THC) during the last century. These changes are likely to be the result of natural multidecadal climate variability and are driven by low-frequency variations of the North Atlantic Oscillation (NAO) through changes in Labrador Sea convection. Indications of a sustained THC weakening are not seen during the last few decades. Instead, a strengthening since the 1980s is observed. The combined assessment of ocean hydrography data and model results indicates that the expected anthropogenic weakening of the THC will remain within the range of natural variability during the next several decades
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1175/JCLI3876.1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Mechanisms affecting the overturning response in global warming simulations (2005)
    AMS (American Meteorological Society)
    In:  Journal of Climate, 18 (23). pp. 4925-4936.
    Details
    Publication Date: 2020-08-04
    Description: Climate models used to produce global warming scenarios exhibit widely diverging responses of the thermohaline circulation (THC). To investigate the mechanisms responsible for this variability, a regional Atlantic Ocean model driven with forcing diagnosed from two coupled greenhouse gas simulations has been employed. One of the coupled models (MPI) shows an almost constant THC, the other (GFDL) shows a declining THC in the twenty-first century. The THC evolution in the regional model corresponds rather closely to that of the respective coupled simulation, that is, it remains constant when driven with the forcing from the MPI model, and declines when driven with the GFDL forcing. These findings indicate that a detailed representation of ocean processes in the region covered by the Atlantic model may not be critical for the simulation of the overall THC changes in a global warming scenario, and specifically that the coupled model’s rather coarse representation of water mass formation processes in the subpolar North Atlantic is unlikely to be the primary cause for the large differences in the THC evolution. Sensitivity experiments have confirmed that a main parameter governing the THC response to global warming is the density of the intermediate waters in the Greenland–Iceland–Norwegian Seas, which in turn influences the density of the North Atlantic Deep Water, whereas changes in the air–sea heat and freshwater fluxes over the subpolar North Atlantic are only of moderate importance, and mainly influence the interannual–decadal variability of THC. Finally, as a consequence of changing surface fluxes, the Labrador Sea convection ceases by about 2030 under both forcings (i.e., even in a situation where the overall THC is stable) indicating that the eventual breakdown of the convection is likely but need not coincide with substantial THC changes.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1175/JCLI3550.1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    The North Atlantic in the greenhouse - overturning response and sensitivities (2003)
    Details
    Publication Date: 2023-01-30
    Description: The response of the thermohaline circulation (THC) in climate models on global warming scenarios differs fundamentally. To examine the role of the ocean component for this deviating behaviour,diagnosed fluxes from coupled greenhouse gas simulations are used to drive a regional model of the Atlantic Ocean. The results demonstrate, that the general response of the THC due to changes in atmospheric forcing is quite robust and insensitive to the improved representation of the ocean component. In order to test the crucial mechanisms for the evolution of the meridional overturning, sensitivity studies are by focussing on different combinations of surface fluxes are performed. The response indicates that the density in the Nordic Seas and subsequently the overflow waters determine trends and long-term variability of the overturning circulation, underlining the importance of that region for the THC. Deep water formation within the Labrador Sea, responsible for interannual to decadal variability is quite sensitive to anthropogenic changes in the surface fluxes, so that its convection eventually breaks down under surface warming and freshening.
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
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