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  • 1
    Electronic Resource
    Electronic Resource
    Nouveau microdensitometre enregistreur pour la spectrophotometrie
    Amsterdam : Elsevier
    Spectrochimica Acta 5 (1952), S. 124-129 
    Details
    ISSN: 0371-1951
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0371-1951(52)80030-X
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Antarctic temperature changes during the last millennium: evaluation of simulations and reconstructions (2012)
    Elsevier
    In:  EPIC3Quaternary Science Reviews, Elsevier, 55, pp. 75-90
    Details
    Publication Date: 2019-07-17
    Description: Temperature changes in Antarctica over the last millennium are investigated using proxy records, a set of simulations driven by natural and anthropogenic forcings and one simulation with data assimilation. Over Antarctica, a long term cooling trend in annual mean is simulated during the period 1000-1850. The main contributor to this cooling trend is the volcanic forcing, astronomical forcing playing a dominant role at seasonal timescale. Since 1850, all the models produce an Antarctic warming in response to the increase in greenhouse gas concentrations. We present a composite of Antarctic temperature, calculated by averaging seven temperature records derived from isotope measurements in ice cores. This simple approach is supported by the coherency displayed between model results at these data grid points and Antarctic mean temperature. The composite shows a weak multi-centennial cooling trend during the pre-industrial period and a warming after 1850 that is broadly consistent with model results. In both data and simulations, large regional variations are superimposed on this common signal, at decadal to centennial timescales. The model results appear spatially more consistent than ice core records. We conclude that more records are needed to resolve the complex spatial distribution of Antarctic temperature variations during the last millennium.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 3
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    Exploring drivers of change in the Ross Sea with a regional ocean model (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-04-24
    Description: The Ross Sea and the Ross Ice Shelf are relatively stable, despite increasing global anthropogenic pressures, with waters below the Ross Ice Shelf remaining in a cold state. The Ross Sea is an important region for sea ice production, as well as water mass transformation and the formation of Antarctic Bottom Water. However, long term observations have shown a trend of freshening in the Ross Sea over the past 6 decades, which is believed to be primarily driven by net mass loss of ice shelves further upstream in the Amundsen Sea. Continued ocean warming and freshening of the Ross Sea has the potential to tip the Ross Ice Shelf cavity from its current cold state to a warm state. This freshening and cold to warm transition could have significant impact on local basal melting (and associated ice mass loss) and deep water formation, as well as farther reaching impacts such as changes to thermohaline circulation and potential sea level rise. We present a regional 1/4° resolution ocean model for the Ross Sea and the surrounding seas, which includes the thermodynamic interaction between ocean and ice shelf. Through perturbations to wind forcing that drives ocean circulation and upstream coastal precipitation reflective of potential future climate conditions, we explore the impacts that these conditions have on ice shelf circulation in the model. Understanding these drivers of change in ocean circulation are essential to understanding the wider implications of climate change on the physical, biogeochemical and biological processes in the Ross Sea.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 4
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    Spatially variable drag in the shear-controlled melt parameterisation below ice shelves in NEMO (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-06-19
    Description: Currently, in NEMO and in most ocean models, melting parameterisation below ice shelves is controlled by shear stress, which depends on the mean flow in the boundary layer and the so-called coefficient of drag. This parameter, constant in space and time, is usually tuned to approach observed melt at a given ice shelf. This is equivalent to parameterise ice shelf bottoms as smooth surfaces, whereas, in reality, they can be very rough at different scales. As ice shelves are predicted to experience further damage in the future, applying a spatially varying drag might decrease uncertainties related to melt predictions below ice shelves.Here we present a study with a spatially variable coefficient of drag, which depends on the topography and on the first wet cell height. We use the ice shelf parameterisation of NEMO4.2 on a configuration of Amundsen Sea at 12〈sup〉th〈/sup〉 of a degree.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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