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  1. Namib turbulence experiment (NamTEX) data report
    Author: Hilland, Rainer V. J.; Bernhofer, Christian; Bohmann, May; Christen, Andreas; Krauß, Matthias; Larsen, Jarl A.; Pitacco, Andrea; Spirig, Robert; Vendrame, Nadia; Vogt, Roland
    Published: 2022
    Publisher:  Universität, Freiburg

    Abstract: This data report details the field methods and data collected during the Namib Turbulence Experiment (NamTEX) campaign of February-March 2020. NamTEX was a multi-national micrometeorological campaign conducted in the Namib Desert to... more

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    Technische Hochschule Bingen, Bibliothek
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    Bibliothek der Hochschule Darmstadt, Zentralbibliothek
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    TU Darmstadt, Universitäts- und Landesbibliothek - Stadtmitte
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    Bibliothek der Frankfurt University of Applied Sciences
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    Universitätsbibliothek J. C. Senckenberg, Zentralbibliothek (ZB)
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    Hochschul- und Landesbibliothek Fulda, Standort Heinrich-von-Bibra-Platz
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    Technische Hochschule Mittelhessen, Hochschulbibliothek Gießen
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    Universitätsbibliothek Gießen
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    Universitätsbibliothek Kassel, Landesbibliothek und Murhardsche Bibliothek der Stadt Kassel
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    Akademie der Wissenschaften und der Literatur, Bibliothek
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    Bibliothek der Hochschule Mainz, Untergeschoss
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    LEIZA - Leibniz-Zentrum für Archäologie, Bibliothek
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    Naturhistorisches Museum und Landessammlung für Naturkunde Mainz, Bibliothek
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    Universität Mainz, Zentralbibliothek
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    Abstract: This data report details the field methods and data collected during the Namib Turbulence Experiment (NamTEX) campaign of February-March 2020. NamTEX was a multi-national micrometeorological campaign conducted in the Namib Desert to investigate the three-dimensional structure of surface layer turbulent flow, and to study how turbulent motions control the spatio-temporal patterns of heat transfer between the sub-surface, surface, and atmosphere.

    This report provides a timeline of the campaign, a description of the field site and field methods, an overview of data collected and instruments used, and details of intermediate processing steps. The report is designed to serve as a reference for NamTEX participants as well as a guide for other readers interested in using the NamTEX data

     
    Export to reference management software   RIS file
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    Source: Union catalogues
    Language: English
    Media type: Book
    Format: Online
    Other identifier:
    DDC Categories: 550
    Edition: November 2022, V1 (Public)
    Subjects: Turbulenz; Feldforschung; Meteorologie <Motiv>; Namibia <Motiv>
    Scope: 1 Online-Ressource
  2. Investigating Taylor's frozen turbulence hypothesis in the surface layer at an ideal desert field site using fibre-optic distributed temperature sensing
    Author: Hilland, Rainer V. J.; Christen, Andreas; Vogt, Roland
    Published: 2022
    Publisher:  Universität, Freiburg

    Abstract: Taylor’s frozen turbulence hypothesis is the most critical assumption through which time-resolving sensors may be used to derive statistics of the turbulent spatial field. Namely, it relates temporal autocorrelation to spatial correlation... more

     

    Abstract: Taylor’s frozen turbulence hypothesis is the most critical assumption through which time-resolving sensors may be used to derive statistics of the turbulent spatial field. Namely, it relates temporal autocorrelation to spatial correlation via the mean wind speed and is invoked in almost all boundary layer field work. Nevertheless, the conditions and scales over which Taylor’s hypothesis is valid remain poorly understood in the atmospheric boundary layer.

    As part of the Namib Turbulence Experiment (NamTEX) campaign in March 2020, a pseudo-3D fibre-optic distributed temperature sensing (DTS) array was installed within a 300 x 300 m area in the Namib desert. The array is X-shaped in plan view and contains 16 measurement heights from 0.45 m to 2.85 m. Fibre-optic sensing provides air temperature measurements at unprecedented spatio-temporal density (0.25 m horizontally, 0.17 m vertically, and 1 Hz) and was coupled with a vertical array of traditional sonic anemometer point measurements to investigate the relationship between spatial and temporal temperature fields. The Namib provides an ideal location for fundamental boundary layer research: homogenous flat surfaces, no vegetation, little moisture, strong solar forcing, regular and repeated clear-sky conditions, and a wide range of atmospheric stabilities.

    Using the NamTEX DTS array we present the first field investigation of Taylor’s hypothesis that considers boundary layer stability and is independent of wind direction. A novel method of 2d horizontal cross-correlation between all possible points of a single height of the DTS is employed to produce spatial ‘maps’ of the turbulent flow, whose velocity, direction, and size may be tracked through time

     
    Export to reference management software   RIS file
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    Source: Union catalogues
    Language: English
    Media type: Book
    Format: Online
    Other identifier:
    Subjects: Turbulenz; Grenzschicht; Prandtl-Schicht; Energiebilanz; Namibia <Motiv>; Wüste; Temperatur
    Other subjects: (local)conferenceObject
    Scope: Online-Ressource
    Notes:

    DACH2022, Leipzig, Deutschland, 21–25 Mar 2022, Meteorologie-Tagung, DACH2022-200
  3. Investigating Taylor's frozen turbulence hypothesis in the surface layer at an ideal desert field site using fibre-optic distributed temperature sensing
    Author: Hilland, Rainer V. J.; Christen, Andreas; Vogt, Roland
    Published: 2022
    Publisher:  Universität, Freiburg

    Abstract: Taylor’s frozen turbulence hypothesis is the most critical assumption through which time-resolving sensors may be used to derive statistics of the turbulent spatial field. Namely, it relates temporal autocorrelation to spatial correlation... more

    Access:
    Verlag (kostenfrei)

    Location:
    Technische Hochschule Bingen, Bibliothek
    Inter-library loan:
    No inter-library loan

    Location:
    Bibliothek der Hochschule Darmstadt, Zentralbibliothek
    Inter-library loan:
    No inter-library loan

    Location:
    TU Darmstadt, Universitäts- und Landesbibliothek - Stadtmitte
    Inter-library loan:
    No inter-library loan

    Location:
    Bibliothek der Frankfurt University of Applied Sciences
    Inter-library loan:
    No inter-library loan

    Location:
    Universitätsbibliothek J. C. Senckenberg, Zentralbibliothek (ZB)
    Inter-library loan:
    No inter-library loan

    Location:
    Hochschul- und Landesbibliothek Fulda, Standort Heinrich-von-Bibra-Platz
    Inter-library loan:
    No inter-library loan

    Location:
    Technische Hochschule Mittelhessen, Hochschulbibliothek Gießen
    Inter-library loan:
    No inter-library loan

    Location:
    Universitätsbibliothek Gießen
    Inter-library loan:
    No inter-library loan

    Location:
    Universitätsbibliothek Kassel, Landesbibliothek und Murhardsche Bibliothek der Stadt Kassel
    Inter-library loan:
    No inter-library loan

    Location:
    Akademie der Wissenschaften und der Literatur, Bibliothek
    Inter-library loan:
    No inter-library loan

    Location:
    Universität Mainz, Zentralbibliothek
    Inter-library loan:
    No inter-library loan

    Location:
    Universität Marburg, Universitätsbibliothek
    Inter-library loan:
    No inter-library loan

    Location:
    Hochschul- und Landesbibliothek RheinMain, Rheinstraße
    Inter-library loan:
    No inter-library loan

     

    Abstract: Taylor’s frozen turbulence hypothesis is the most critical assumption through which time-resolving sensors may be used to derive statistics of the turbulent spatial field. Namely, it relates temporal autocorrelation to spatial correlation via the mean wind speed and is invoked in almost all boundary layer field work. Nevertheless, the conditions and scales over which Taylor’s hypothesis is valid remain poorly understood in the atmospheric boundary layer.

    As part of the Namib Turbulence Experiment (NamTEX) campaign in March 2020, a pseudo-3D fibre-optic distributed temperature sensing (DTS) array was installed within a 300 x 300 m area in the Namib desert. The array is X-shaped in plan view and contains 16 measurement heights from 0.45 m to 2.85 m. Fibre-optic sensing provides air temperature measurements at unprecedented spatio-temporal density (0.25 m horizontally, 0.17 m vertically, and 1 Hz) and was coupled with a vertical array of traditional sonic anemometer point measurements to investigate the relationship between spatial and temporal temperature fields. The Namib provides an ideal location for fundamental boundary layer research: homogenous flat surfaces, no vegetation, little moisture, strong solar forcing, regular and repeated clear-sky conditions, and a wide range of atmospheric stabilities.

    Using the NamTEX DTS array we present the first field investigation of Taylor’s hypothesis that considers boundary layer stability and is independent of wind direction. A novel method of 2d horizontal cross-correlation between all possible points of a single height of the DTS is employed to produce spatial ‘maps’ of the turbulent flow, whose velocity, direction, and size may be tracked through time

     
    Export to reference management software   RIS file
      BibTeX file
    Source: Union catalogues
    Language: English
    Media type: Book
    Format: Online
    Other identifier:
    DDC Categories: 530
    Subjects: Turbulenz; Grenzschicht; Prandtl-Schicht; Energiebilanz; Namibia <Motiv>; Wüste; Temperatur
    Scope: 1 Online-Ressource
    Notes:

    DACH2022, Leipzig, Deutschland, 21–25 Mar 2022, Meteorologie-Tagung, DACH2022-200
  4. Namib turbulence experiment (NamTEX) data report
    Author: Hilland, Rainer V. J.; Bernhofer, Christian; Bohmann, May; Christen, Andreas; Krauß, Matthias; Larsen, Jarl A.; Pitacco, Andrea; Spirig, Robert; Vendrame, Nadia; Vogt, Roland
    Published: 2022
    Publisher:  Universität, Freiburg

    Abstract: This data report details the field methods and data collected during the Namib Turbulence Experiment (NamTEX) campaign of February-March 2020. NamTEX was a multi-national micrometeorological campaign conducted in the Namib Desert to... more

     

    Abstract: This data report details the field methods and data collected during the Namib Turbulence Experiment (NamTEX) campaign of February-March 2020. NamTEX was a multi-national micrometeorological campaign conducted in the Namib Desert to investigate the three-dimensional structure of surface layer turbulent flow, and to study how turbulent motions control the spatio-temporal patterns of heat transfer between the sub-surface, surface, and atmosphere.

    This report provides a timeline of the campaign, a description of the field site and field methods, an overview of data collected and instruments used, and details of intermediate processing steps. The report is designed to serve as a reference for NamTEX participants as well as a guide for other readers interested in using the NamTEX data

     
    Export to reference management software   RIS file
      BibTeX file
    Source: Union catalogues
    Language: English
    Media type: Book
    Format: Online
    Other identifier:
    Edition: November 2022, V1 (Public)
    Subjects: Turbulenz; Feldforschung; Meteorologie <Motiv>; Namibia <Motiv>
    Other subjects: (local)Other
    Scope: Online-Ressource