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        <gco:CharacterString>This data set builds upon the broadband detection lists of the International Monitoring System (IMS)’s infrasound stations. The infrasound data of these stations are regularly (re-)processed at the German National Data Centre at BGR (e.g., Ceranna et al., 2019; https://doi.org/10.1007/978-3-319-75140-5_13) using the Progressive Multi-Channel Correlation (PMCC) array processing method (Cansi, 1995; https://doi.org/10.1029/95GL00468). The latest reprocessing with 26 one-third octave spaced frequency bands in the IMS band of interest (0.01 to 4 Hz) included all 53 stations that were certified within the period 2003 to 2020. Based on the resulting broadband detection lists, this data set expands on former analyses of the coherent ambient noise. For each station with a data availability of at least one year (by the end of 2020), monthly reference histograms for the detection parameters back azimuth, apparent speed, and root-mean-squared amplitude are provided. The histograms provide a means to determine the deviation from nominal monthly behaviour and thus enable assessing the plausibility of detections and potential anomalies – without determining their cause – in the detected parameters. Overall, these quality metrics will be, among other applications, a useful supplement to the open-access IMS infrasound data products provided by Hupe et al., which are also available in BGR’s product centre. Further details of the reference histograms are described in the following publication by Kristoffersen et al.: "Updated global reference models of broadband coherent infrasound signals for atmospheric studies and civilian applications" (https://doi.org/10.1029/2022EA002222).</gco:CharacterString>
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            <gmd:LocalisedCharacterString locale="#locale-ger">Dieser Datensatz baut auf den Breitband-Detektionslisten der Infraschall-Stationen des Internationalen Beobachtungsnetzes (engl. IMS) für die Verifikation des Kernwaffenteststoppvertrags (CTBT) auf. Die Infraschalldaten dieser Stationen werden an der BGR als nationales Datenzentrum regelmäßig (re-)prozessiert (z.B. Ceranna et al., 2019; https://doi.org/10.1007/978-3-319-75140-5_13), und zwar unter Verwendung der Software PMCC (Cansi, 1995; https://doi.org/10.1029/95GL00468). Die neueste Reprozessierung mit 26 Terzbändern im IMS-relevanten Frequenzband (0,01 bis 4 Hz) umfasste alle 53 Stationen, die im Zeitraum 2003 bis 2020 zertifiziert wurden. Basierend auf den resultierenden Breitband-Detektionslisten erweitert dieser Datensatz frühere Analysen des kohärenten Umgebungslärms an den Infraschall-Stationen. Für jede Station mit einer Datenverfügbarkeit von mindestens einem Jahr (bis Ende 2020) werden monatliche Referenzhistogramme für die Detektionsparameter Rückazimut, scheinbare Geschwindigkeit und RMS-Amplitude bereitgestellt. Die Histogramme bieten eine Möglichkeit, die Abweichung vom monatlich nominalen Detektionsverhalten zu bestimmen und ermöglichen so eine Plausibilitätsbeurteilung von Detektionen bzw. möglicher Anomalien in den erkannten Parametern – allerdings ohne Aussage zur jeweiligen Ursache. Insgesamt wird diese Qualitätsmetrik unter anderem eine sinnvolle Ergänzung zu den frei zugänglichen IMS-Infraschall-Datenprodukten von Hupe et al. sein, die ebenfalls im Produktcenter der BGR verfügbar sind. Weitere Details der Referenzhistogramme sind in der folgenden Veröffentlichung von Kristoffersen et al. beschrieben: "Updated global reference models of broadband coherent infrasound signals for atmospheric studies and civilian applications" (https://doi.org/10.1029/2022EA002222).</gmd:LocalisedCharacterString>
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            <MD_ScopeCode xmlns="http://www.isotc211.org/2005/gmd" codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#MD_ScopeCode" codeListValue="dataset" />
          </gmd:level>
          <gmd:levelDescription xmlns:gco="http://www.isotc211.org/2005/gco" gco:nilReason="inapplicable" />
        </gmd:DQ_Scope>
      </gmd:scope>
      <gmd:lineage>
        <gmd:LI_Lineage>
          <gmd:statement>
            <gco:CharacterString xmlns:gco="http://www.isotc211.org/2005/gco">As the German National Data Centre for the CTBT, BGR archives waveform data of IMS infrasound arrays and produces infrasound broadband detection lists using the Progressive Multi-Channel Correlation (PMCC) algorithm. The histograms are derived from the detection lists as described in the paper by Kristoffersen et al. The data quality depends on the station performance and can be temporarily reduced, e.g. due to failures of the instruments or power outage. These histogram data products enable assessing the plausibility of detections in terms of back azimuth, velocity and amplitude and identifying anomalies in the detected parameters.</gco:CharacterString>
          </gmd:statement>
        </gmd:LI_Lineage>
      </gmd:lineage>
    </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
</gmd:MD_Metadata>

