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  • 1
    Book
    Book
    Stability of the thermohaline circulation in analytical and numerical models : = Stabilität der thermohalinen Zirkulation in analytischen und numerischen Modellen (1996)
    Bremerhaven : Alfred-Wegener-Institut für Polar- und Meeresforschung
    Details Availability
    Keywords: Hochschulschrift ; Atlantischer Ozean Nord ; Salzgehalt ; Atlantischer Ozean Nord ; Wärmeübertragung ; Atlantischer Ozean Nord ; Thermohaline Zirkulation ; Modell ; Klimaänderung ; Atlantischer Ozean Nord ; Salzgehalt ; Atlantischer Ozean Nord ; Wärmeübertragung ; Atlantischer Ozean Nord ; Thermohaline Zirkulation ; Modell ; Klimaänderung
    Type of Medium: Book
    Pages: 128 S. , Ill., zahlr. graph. Darst.
    Series Statement: Berichte zur Polarforschung 200
    URL: https://www.gbv.de/dms/tib-ub-hannover/215154452.pdf
    RVK:
    RY 20075
    Language: English
    Note: Zugl.: Bremen, Univ., Diss.
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  • 2
    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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  • 3
    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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  • 4
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    Stability of the thermohaline circulation in analytical and numerical models (1996)
    In:  EPIC3Reports on Polar Research, Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, 200, 128 p.
    Details
    Publication Date: 2019-07-17
    Description: Freshening of high latitude surface water in the North Atlantic can change the poleward oceanic transport of heat and salt with drastic effects on the global climate. The sensitivity of the thermohaline circulation is analyzed with respect to these perturbations. The study is based on coupled ocean-atmosphere (-sea ice) models with different levels of complexity in idealized geometries of the Atlantic ocean.An atmospheric energy balance model (EBM) is constructed which can predict the heat and fresh water fluxes at the surface. The response of the EBM to sea surface temperature anomalies and radiative forcing is consistent with complex atmospheric models.For a range of coupled models it is shown that the atmospheric transports affect the stability of the thermohaline circulation (THC). Coupled atmosphere EBM-ocean circulation model experiments show that the atmospheric heat transport is an important destabilizing effect while changes in fresh water flux are of minor importance for the THC. To understand the sensitivity of the THC for a range of atmospheric boundary conditions, a box model is designed, as it is considered the most simple atmosphere-ocean system. The analytical investigation shows how the stability of the THC is affected by the representation of the atmospheric transport of heat and moisture and the basic state.Depending on the meridional gradient in salinity, self-sustained oscillations do appear in a coupled atmosphere EBM-ocean circulation model caused by strong horizontal salinity gradients. It was found the the oscillatory state is more sensitive to perturbations than basic states with moderate meridional salinity gradients which is consistent with the analytical model.The sensitivity and feedback mechanisms affecting the THC are examined in a coupled ocean-atmosphere-sea ice system. The EBM is coupled with an ocean circulation model which includes a thermodynamic sea ice model. Due to a perturbation in high latitude salinity, the THC evolves into an other steady state with decreased atmospheric temperature, more sea ice, enhanced atmospheric heat transport, and decreased oceanic heat transport. The formation of intermediate water and cessation of deep convection in the northern North Atlantic is consistent with paleoclimatic findings of well documented climate shifts caused by a fresh water release.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Thesis , notRev
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  • 5
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    Stability of the thermohaline circulation in a simple coupled model (1996)
    In:  EPIC3TellusA, 48, pp. 465-477
    Details
    Publication Date: 2019-07-17
    Description: In an analytical study the stability of the thermohaline circulation with respect to freshwater perturbations in high latitudes is investigated. The study is based on a coupled ocean and atmosphere box model in an idealized North Atlantic geometry. The box model provides a qualitative understanding of how the thermohaline circulation is affected by feedback mechanisms associated with changes in atmospheric transports of heat and moisture. Within a linear analysis we examine the stability of the thermohaline circulation for a range of different atmospheric boundary conditions. The stability of the coupled system depends on the imposed transport parameterizations and the basic state. For the underlying non-linear system we examine the sensitivity with respect to the strength of salinity perturbation.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 6
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    Feedback mechanisms affecting the thermohaline circulation (1996)
    In:  EPIC3Proceedings of the ACSYS conference on the Dynamics of the Arctic Climate System, Goeteborg, Sweden, pp. 420-424
    Details
    Publication Date: 2019-07-17
    Description: Changes in high latitude surface salinity have a strong effect on the North Atlantic Deep Water Formation (NADWF) which appears to be very important in driving the global thermohaline conveyor belt. Natural variations of sea surface salinity and sea ice have been observed in the North Atlantic, namely the Great Salt Anomaly (GSA) of the late sixties and seventies. When dealing with climate variability one must consider the sensitivity of the climate system to perturbations.In order to include the atmospheric heat transport mechanisms we coupled an atmosphere energy balance model with a 3-D ocean general circulation model which includes a thermodynamic sea ice model. We explore the feedback mechanisms in the ocean-atmosphere-sea ice system affecting the thermohaline circulation (THC) under perturbations in sea surface salinity at high latitudes.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 7
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    Sensitivity of the thermohaline circulation in coupled oceanic GCM - atmospheric EBM experiments (1996)
    In:  EPIC3Climate Dynamics, 12, pp. 403-416
    Details
    Publication Date: 2019-07-17
    Description: 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 characterised 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.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 8
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    Stability of the thermohaline circulation in analytical and numerical models = Stabilität der thermohalinen Zirkulation in analytischen und numerischen Modellen (1996)
    Alfred Wegener Institute for Polar and Marine Research
    In:  EPIC3Berichte zur Polarforschung (Reports on Polar Research), Bremerhaven, Alfred Wegener Institute for Polar and Marine Research, 200, 128 p., ISSN: 0176-5027
    Details
    Publication Date: 2018-09-03
    Repository Name: EPIC Alfred Wegener Institut
    Type: "Berichte zur Polar- und Meeresforschung" , notRev
    Format: application/pdf
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