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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
    Format: application/pdf
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  • 2
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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
    Format: text
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  • 3
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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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