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  • 1
    Description / Table of Contents: Magnetic susceptibility (MS) is a tool frequently used by geologists on sediments or rocks to perform correlations and sea-level or climatic reconstructions. Applied measurements are made on unoriented, bulk samples and bulk MS is mostly influenced by the magnetic mineral content of the rock and often interpreted as influenced by detrital inputs. Magnetic data acquisition is fast and straightforward and this allows the high-resolution sampling needed for palaeoclimatic research (e.g. spectral analysis). However, the link with detrital inputs is not always preserved and the impact of diagenesis on the final MS signal can blur primary information. This volume includes contributions dealing with the origin of the magnetic minerals, and the application of MS as a palaeoenvironmental or palaeoclimatic proxy and also as a tool to provide astronomical calibration in order to improve the chronology of selected time intervals.
    ISBN: 9781862397217
    Language: English
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  • 2
    Publication Date: 2019-07-17
    Description: Polar Ozone and Aerosol Measurement (POAM) III,a follow-on to the successful POAM II, is a spaceborne experiment designedto measure the vertical profiles of ozone, water vapor, nitrogen dioxide,and aerosol extinction in the polar stratosphere and upper troposphere witha vertical resolution of 1-2 km. Measurements are made by the solaroccultation technique. POAM III, now in polar orbit aboard the SPOT 4 satellite,is providing data on north- and south-polar ozone phenomena, including the south-polar ozone hole, and on the spatial and temporal variability of stratosphericaerosols, polar stratospheric clouds, and polar mesospheric clouds.Differences between POAM III and POAM II instruments are described.First validation of POAM III products by comparison with HalogenOccultation Experiment and ozonesonde data are presented.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 3
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    In:  EPIC3Proc WRCP Conf on the Dynamics of the Arctic Climate System, Gothenburg, Sweden
    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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  • 4
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    In:  EPIC3Climate Change 2001: The Scientific Basis. Contribution of Working Group to the Third Assessment Report of the Intergouvernmental Panel on Climate Change [Houghton, J.T. et al. (eds)]. Cambridge University Press, Cambridge, United Kongdom and New York, US, 881 p., ISBN: 0521 01495 6
    Publication Date: 2019-07-16
    Repository Name: EPIC Alfred Wegener Institut
    Type: Book , peerRev
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  • 5
    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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    In:  EPIC3Proceedings of the ACSYS conference on the Dynamics of the Arctic Climate System, Goeteborg, Sweden, pp. 420-424
    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
    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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    In:  EPIC3Berichte aus dem Fachbereich Physik, 44 p.
    Publication Date: 2019-07-17
    Description: We present a simple, deterministic energy balance model in this report. The model is designed to represent the atmospheric component of the coupled atmosphere-ocean system. It is a one dimensional, global model with time and space resolutions of one year and 10^0 of latitude respectively. The model predicts the surface air temperature and estimates the surface freshwater flux diagnostically.The coupling between the atmospheric model and an ocean model is accomplished by heat and freshwater fluxes at their interface. The heat flux is calculated according to the difference in the surface air temperature and ocean surface temperature, while the freshwater flux is estimated from the latent heat transport in the atmosphere by a diagnostic equation since no explicit hydrologic cycle or water vapour budget is kept in the model. Two parameterizations for the latent heat transport are proposed, which distinguishes the two versions of the model. The assumptions made in the first version are that the total heat transport in the combined system is invariant and that the atmospheric sensible heat transport can be approximated by a diffusion process, whereas in the second version both atmospheric sensible heat and water vapour transport are treated as a diffusion process.Before proceeding with interactive runs, we study the behaviour of the model in a decoupled mode. Some experiments with initial conditions altered and external forcings changed are carried out to investigate the sensitivity and stability of the model. In particular, the influence of the ice-albedo feedback on model solutions is examined. The results of these experiments may be helpful both in understanding the characteristics of the model and in interpreting results when the model is coupled to an OGCM.2 x CO2 Experiment
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , notRev
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  • 9
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    In:  EPIC3Theoretical and applied climatology, 51, pp. 25-38
    Publication Date: 2019-07-17
    Description: We present a simple, deterministic energy balance model in this report. The model is designed to represent the atmospheric component of the coupled atmosphere-ocean system. It is a one dimensional, global model with time and space resolutions of one year and 10^0 of latitude respectively. The model predicts the surface air temperature and estimates the surface freshwater flux diagnostically.The coupling between the atmospheric model and an ocean model is accomplished by heat and freshwater fluxes at their interface. The heat flux is calculated according to the difference in the surface air temperature and ocean surface temperature, while the freshwater flux is estimated from the latent heat transport in the atmosphere by a diagnostic equation since no explicit hydrologic cycle or water vapour budget is kept in the model. Two parameterizations for the latent heat transport are proposed, which distinguishes the two versions of the model. The assumptions made in the first version are that the total heat transport in the combined system is invariant and that the atmospheric sensible heat transport can be approximated by a diffusion process, whereas in the second version both atmospheric sensible heat and water vapour transport are treated as a diffusion process.Before proceeding with interactive runs, we study the behaviour of the model in a decoupled mode. Some experiments with initial conditions altered and external forcings changed are carried out to investigate the sensitivity and stability of the model. In particular, the influence of the ice-albedo feedback on model solutions is examined. The results of these experiments may be helpful both in understanding the characteristics of the model and in interpreting results when the model is coupled to an OGCM.2 x CO2 Experiment
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 10
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , notRev
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