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  • 1
    Online Resource
    Online Resource
    Veränderlichkeit des Nordatlantischen Stroms und Vorhersagbarkeit von Variabilität im Europäischen Nordmeer und im Nordpolarmeer : Endbericht 2000 (2001)
    Bremerhaven
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: Online Ressource, 33 p. = 12,6 MB, text and images , ill
    Edition: [Elektronische Ressource]
    URL: https://edocs.tib.eu/files/e01fb01/331880385.pdf
    URL: https://edocs.tib.eu/files/e01fb01/331880385l.pdf
    Language: German
    Note: Contract BMBF 01LA9823/7. - nIndex. - Differences between the printed and electronic version of the document are possible , Also available as printed version , Systemvoraussetzungen: Acrobat Reader.
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  • 2
    Electronic Resource
    Electronic Resource
    Numerical simulation of salinity anomaly propagation in the Nordic seas and the Arctic Ocean (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 18 (1999), S. 0 
    Details
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: We investigate the response of the Nordic seas-Arctic Ocean system to surface freshwater flux anomalies that we regard as typical for long-term atmospheric variability. We employ response experiments with a coupled sea ice-ocean model where we introduce a surface freshwater flux anomaly (A) over the Norwegian Sea and (B) in the Laptev Sea. Case A offers an explanation for the intermediate depth salinity changes observed in the Amundsen Basin. The signal observed there belongs to an original perturbation that, according to the model, occurred around a decade earlier. Salinity fluctuations in the Laptev Sea could play a role in changes in the near surface salinity in the Amundsen Basin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-8369.1999.tb00288.x
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Cyclones over Fram Strait: impact on sea ice and variability (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 20 (2001), S. 0 
    Details
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: The relation between sea ice drift and cyclone activity in the Fram Strait region was studied by both in situ observations and long-term time series. In a 1999 field campaign, the atmospheric forcing and the ice drift were determined using a research aircraft and drifting ice buoys. One cyclone entered the experimental area and caused a temporal increase in ice drift speed. Long-term studies are based on 16 years of cyclone statistics and model, satellite and sonar ice drift estimates. The actual impact of a cyclone depends on its particular track through Fram Strait. On the average, cyclones increase the Arctic ice export through Fram Strait.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-8369.2001.tb00050.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Sensitivity of the thermohaline circulation in coupled oceanic GCM – atmospheric EBM experiments (1996)
    Springer
    Climate dynamics 12 (1996), S. 403-416 
    Details
    ISSN: 1432-0894
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract. We analyze the sensitivity of the oceanic thermohaline circulation (THC) regarding perturbations in fresh water flux for a range of coupled oceanic general circulation – atmospheric energy balance models. The energy balance model (EBM) predicts surface air temperature and fresh water flux and contains the feedbacks due to meridional transports of sensible and latent heat. In the coupled system we examine a negative perturbation in run-off into the southern ocean and analyze the role of changed atmospheric heat transports and fresh water flux. With mixed boundary conditions (fixed air temperature and fixed surface fresh water fluxes) the response is characterized by a completely different oceanic heat transport than in the reference case. On the other hand, the surface heat flux remains roughly constant when the air temperature can adjust in a model where no anomalous atmospheric transports are allowed. This gives an artificially stable system with nearly unchanged oceanic heat transport. However, if meridional heat transports in the atmosphere are included, the sensitivity of the system lies between the two extreme cases. We find that changes in fresh water flux are unimportant for the THC in the coupled system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003820050117
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Sensitivity of the thermohaline circulation in coupled oceanic GCM — atmospheric EBM experiments (1996)
    Springer
    Climate dynamics 12 (1996), S. 403-416 
    Details
    ISSN: 1432-0894
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We analyze the sensitivity of the oceanic thermohaline circulation (THC) regarding perturbations in fresh water flux for a range of coupled oceanic general circulation — atmospheric energy balance models. The energy balance model (EBM) predicts surface air temperature and fresh water flux and contains the feedbacks due to meridional transports of sensible and latent heat. In the coupled system we examine a negative perturbation in run-off into the southern ocean and analyze the role of changed atmospheric heat transports and fresh water flux. With mixed boundary conditions (fixed air temperature and fixed surface fresh water fluxes) the response is characterized by a completely different oceanic heat transport than in the reference case. On the other hand, the surface heat flux remains roughly constant when the air temperature can adjust in a model where no anomalous atmospheric transports are allowed. This gives an artificially stable system with nearly unchanged oceanic heat transport. However, if meridional heat transports in the atmosphere are included, the sensitivity of the system lies between the two extreme cases. We find that changes in fresh water flux are unimportant for the THC in the coupled system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00211686
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    Paper (German National Licenses)
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  • 6
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    Continuous thermosalinograph oceanography along POLARSTERN cruise track ANT-XIII/5 (1998)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publication Date: 2024-06-26
    Keywords: ANT-XIII/5; AWI_PhyOce; CT; DATE/TIME; DEPTH, water; LATITUDE; LONGITUDE; Physical Oceanography @ AWI; Polarstern; PS40; PS40/5-track; Salinity; Temperature, water; Thermosalinograph; TSG; Underway cruise track measurements
    Type: Dataset
    Format: text/tab-separated-values, 7300 data points
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    DATA PANGAEA
  • 7
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    Sea ice effects on the sensitivity of the thermohaline circulation in simplified atmosphere-ocean-sea ice models (1998)
    In:  EPIC3Journal of Climate, 11, pp. 2789-2803
    Details
    Publication Date: 2019-07-17
    Description: We investigate the sensitivity of the thermohaline circulation (THC) with respect to a subpolar salinity perturbation. Such perturbation simulates a fresh water release caused by retreating glaciers or anomalous sea ice. The feedback mechanisms amplifying or damping the initial anomaly are analyzed in the coupled ocean-atmosphere-sea ice model. Their understanding is essential for modelling climate variability on decadal and longer time scales.A 3-D ocean circulation model is coupled to an atmospheric energy balance and a thermodynamic sea ice model. The perturbation in the North Atlantic's subpolar salinity causes a cessation of deep convection and a climate state with decreased oceanic heat transport, decreased high latitude atmospheric temperature, and larger sea ice extent. The sea ice isolates the atmosphere from the warmer ocean reducing the heat flux and thus the vertical mixing in the ocean. This change in the local buoyancy flux is responsible for a reduced large-scale circulation. This change in the local buoyancy flux weakens the large scale circulation. High latitude cooling can not compensate for the freshening since the ocean temperature can not fall below the freezing point. Because deep convection is suppressed where sea ice is present, North Atlantic deep water formation is rather sensitive to the formation of sea ice. The insulating effect of sea ice is more important than its impact on salinity in our experiments. Different types of boundary conditions are used to isolate relevant feedback processes. The stability of the THC depends crucially on the atmospheric model component. Active atmospheric heat transport allows continued deep water formation because the sea ice margin is shifted poleward.You can find the model code for the EBM (Get the FORTRAN code of the model) . You may find also information in read.me.Reference StateMinimal overturning after 14 years .Development after the perturbation in the coupled model .Feedback mechanisms .
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 8
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    Influence of Arctic river runoff on the circulation in the Arctic Ocean (1999)
    In:  EPIC3ICES ASC Council Meeting 1999,L/11, 5 p.
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 9
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    Stroemungen und Wirbel - Der Wasserkreislauf im Nordpolarmeer (2001)
    In:  EPIC3Eiskalte Entdeckungen : Forschungsreisen zwischen Nord- und Südpol / hrsg. von Gert Lange. Mit fünf künstlerischen Fotogr. von Britta Lauer. Bielefeld : Delius Klasing, pp. 253-258, ISBN: 3-7688-1257-X
    Details
    Publication Date: 2014-04-15
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
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  • 10
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    Vergleich der thermohalinen Zirkulation in zwei globalen ozeanischen Zirkulationsmodellen - The Ocean Model Intercomparison Project (2000)
    In:  EPIC3Abschlußbericht BMBF Projekt 01 LA 9862/8, 133 p.
    Details
    Publication Date: 2019-07-16
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , notRev
    Format: application/pdf
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