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  • 1
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    Chandler and annual wobbles based on space-geodetic measurements / Polar motions with a half-Chandler period and less in their temporal variability (2002)
    Deutsches GeoForschungsZentrum GFZ
    In:  Scientific Technical Report STR
    Details
    Publication Date: 2021-08-08
    Description: Chandler and annual wobbles based on space-geodetic measurements: In this study, we examine the major components of polar motion, focusing on quantifying their temporal variability. In particular, by using the combined Earth orientation series SPACE99 computed by the Jet Propulsion Laboratory (JPL) from 1976 to 2000 at daily intervals, the Chandler and annual wobbles are separated by recursive band-pass filtering of the χ1- and χ2 -components. Then, for the trigonometric, exponential, and elliptic forms of representation, the parameters including their uncertainties are computed at epochs using quarterly sampling. The characteristics and temporal evolution of the wobbles are presented, as well as a summary of estimates of different parameters for four epochs.
    Description: Polar motions with a half-Chandler period and less in their temporal variability: Our study focuses on the observed higher-frequency polar motions that are substantially smaller than the Chandler and annual wobbles. Here, the combined Earth orientation series SPACE99 from 1976 to 2000 with one-day sampling is used as input data, after removing the low-frequency, the Chandler and annual terms. We applied a data processing procedure including four steps, each computing the amplitude spectrum by a Fast Fourier Transform in order to reveal the periodic signals in the residual motions, and then separating their components from the residual time series by band-pass filtering. In particular, the oscillations have the following periods: Semi-Chandler and semi-annual periods and those of order four, three, two, and one and a half months, as well as quasi-biennial and 300-day periods. We show to what extent the observed polar motions are irregularly occurring. A very small polar motion signal with the period of one month is still found in the remaining motions.
    Language: English
    Type: info:eu-repo/semantics/report
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  • 2
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    Zur Taxonomie von rezenten benthischen Foraminiferen aus dem Nansen-Becken, Arktischer Ozean = Taxonomic notes on recent benthic Foraminifera from Nansen Basin, Arctic Ocean (1992)
    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, 112, 137 p., ISSN: 0176-5027
    Details
    Publication Date: 2018-09-03
    Repository Name: EPIC Alfred Wegener Institut
    Type: "Berichte zur Polar- und Meeresforschung" , notRev
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  • 3
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    Yearbook Magnetic Results 2001, 2002, 2003 : Adolf Schmidt Geomagnetic Observatory Niemegk, Geomagnetic Observatory Wingst (2007)
    GeoForschungsZentrum
    Details
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Language: English
    Type: info:eu-repo/semantics/book
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  • 4
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    Taxonomic Composition and Vertical Distribution of Plank.tonic and Micronektonic Cephalopoda in the Levantine Sea (Eastern Mediterranean) (2000)
    Leitstelle METEOR, Institut für Meereskunde an der Universität Hamburg
    In:  In: Meteor-Berichte. Meteor-Berichte, 003 . Leitstelle METEOR, Institut für Meereskunde an der Universität Hamburg, Hamburg, Germany, pp. 206-207.
    Details
    Publication Date: 2021-07-07
    Type: Book chapter , NonPeerReviewed
    Format: text
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  • 5
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    The Geodesist’s Handbook 2016 (2016)
    In:  Journal of Geodesy
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    Publication Date: 2020-02-12
    Type: info:eu-repo/semantics/article
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  • 6
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    Atlantic Leptolida (Hydrozoa, Cnidaria) of the families Aglaopheniidae, Halopterididae, Kirchenpaueriidae and Plumulariidae collected during the CANCAP and Mauritania-II expeditions of the National Museum of Natural History, Leiden, the Netherlands (2001)
    In:  Zoologische Verhandelingen vol. 333, pp. 1-268
    Details
    Publication Date: 2024-01-12
    Description: Forty-six species of the superfamily Plumularioidea (Hydrozoa, Cnidaria) and some material identified to the generic level, collected by the CANCAP and Mauritania-II expeditions of the Rijkmuseum van Natuurlijke Historie (now Nationaal Natuurhistorisch Museum) in the period 1976-1988, are described, as well as two other species that were used in the present study. In addition to the descriptions, synonymy, variability and geographical distribution are discussed; autoecological data and measurements are also presented. The new species described here are: Aglaophenia svobodai spec. nov., Streptocaulus caboverdensis spec. nov., S. chonae spec. nov., Antennella confusa spec. nov. and Nemertesia anonyma spec. nov. All species are figured. The general classification used follows Bouillon (1985, 1995); nomenclature on the species level is as used by Svoboda & Cornelius (1991), Ramil & Vervoort (1992a, 1992b), Calder (1997) and Schuchert (1997). The material originates from the seas and coasts around the Azores, Madeira, Selvagens, Canary Islands and Cape Verde Islands, as well as the Atlantic off Morocco and Mauritania, at depths varying between 0 and 4000 m. All species discussed have a wider, usually Atlantic distribution, with the exception of Streptocaulus pulcherrimus Allman, 1883, endemic in the Cape Verde area and Nemertesia belini Bedot, 1916, known only from the Azores and Cape Verde Islands.
    Keywords: Cnidaria ; Hydrozoa ; Leptolida ; Aglaopheniidae ; Halopterididae ; Kirchenpaueriidae ; Plumulariidae ; north-eastern Atlantic ; geographical distribution
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 7
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    Analysing direct air capture for enabling negative emissions in Germany : an assessment of the resource requirements and costs of a potential rollout in 2045 (2024)
    Details
    Publication Date: 2024-03-05
    Description: Direct air capture (DAC) combined with subsequent storage (DACCS) is discussed as one promising carbon dioxide removal option. The aim of this paper is to analyse and comparatively classify the resource consumption (land use, renewable energy and water) and costs of possible DAC implementation pathways for Germany. The paths are based on a selected, existing climate neutrality scenario that requires the removal of 20 Mt of carbon dioxide (CO2) per year by DACCS from 2045. The analysis focuses on the so-called "low-temperature" DAC process, which might be more advantageous for Germany than the "high-temperature" one. In four case studies, we examine potential sites in northern, central and southern Germany, thereby using the most suitable renewable energies for electricity and heat generation. We show that the deployment of DAC results in large-scale land use and high energy needs. The land use in the range of 167-353 km2 results mainly from the area required for renewable energy generation. The total electrical energy demand of 14.4 TWh per year, of which 46% is needed to operate heat pumps to supply the heat demand of the DAC process, corresponds to around 1.4% of Germany's envisaged electricity demand in 2045. 20 Mt of water are provided yearly, corresponding to 40% of the city of Cologne's water demand (1.1 million inhabitants). The capture of CO2 (DAC) incurs levelised costs of 125-138 EUR per tonne of CO2, whereby the provision of the required energy via photovoltaics in southern Germany represents the lowest value of the four case studies. This does not include the costs associated with balancing its volatility. Taking into account transporting the CO2 via pipeline to the port of Wilhelmshaven, followed by transporting and sequestering the CO2 in geological storage sites in the Norwegian North Sea (DACCS), the levelised costs increase to 161-176 EUR/tCO2. Due to the longer transport distances from southern and central Germany, a northern German site using wind turbines would be the most favourable.
    Keywords: ddc:600
    Repository Name: Wuppertal Institut für Klima, Umwelt, Energie
    Language: English
    Type: article , doc-type:article
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