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  • 2020-2024  (2)
  • 2010-2014  (2)
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  • 1
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    Measurement of the elastic scattering cross section of neutrons from argon and neon (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-05-22
    Description: Author(s): S. MacMullin, M. Kidd, R. Henning, W. Tornow, C. R. Howell, and M. Brown Background: The most significant source of background in direct dark matter searches are neutrons that scatter elastically from nuclei in the detector's sensitive volume. Experimental data for the elastic scattering cross section of neutrons from argon and neon, which are target materials of interes... [Phys. Rev. C 87, 054613] Published Tue May 21, 2013
    Keywords: Nuclear Reactions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
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    ASCAT Surface State Flag (SSF): extracting Information on Surface Freeze/Thaw Conditions From Backscatter Data Using an Empirical Threshold-Analysis Algorithm (2012)
    In:  IEEE Transactions on Geoscience and Remote Sensing
    Details
    Publication Date: 2020-02-12
    Description: Information on soil surface state is valuable for many applications such as climate studies and monitoring of permafrost regions. C-band scatterometer data indicate good potential to deliver information on surface freeze/thaw. Variation in state or amount of water contained in the soil causes significant alteration of dielectric properties of the soil which is markedly observable in scatterometer backscattered signal. A threshold-analysis method is developed to derive a set of parameters to be used in evaluating the normalized backscatter measurements through decision trees and anomaly detection modules for determination of freeze/thaw conditions. The model parameters are extracted from two years (2007-2008) backscatter data from ASCAT scatterometer onboard Metop satellite collocated with ECMWF ReAnalysis (ERA-Interim) soil temperature. Backscatter measurements are flagged as indicator of frozen/unfrozen surface, and snowmelt or existing water on the surface. The output product, so-called surface state flag (SSF), compares well with two modeled soil temperature data sets as well as the air temperature measurements from synoptic meteorological stations across the northern hemisphere. The SSF time series are also validated with soil temperature data available at four in situ observation sites in Siberian and Alaska regions showing the overall accuracy of about 80% to 90%.
    Language: English
    Type: info:eu-repo/semantics/article
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    GFZ OAI
  • 3
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    Global Gravity-based Groundwater Product (G3P). V. 1.11 (2023)
    GFZ Data Services
    Details
    Publication Date: 2023-07-31
    Description: The Global Gravity-based Groundwater Product (G3P) provides groundwater storage anomalies (GWSA) from a cross-cutting combination of GRACE/GRACE-FO-based terrestrial water storage (TWS) and storage compartments of the water cycle (WSCs) that are part of the Copernicus portfolio. The data set comprises gridded anomalies of groundwater, TWS, and the WSCs glacier, snow, soil moisture and surface water bodies plus layers containing uncertainty information for the individual data products. All WSCs are spatially filtered with a Gaussian filter to be compatible with TWS. Spatial coverage is global, except Greenland and Antarctica, with 0.5-degree resolution. Temporal coverage is from April 2002 to December 2020 with monthly temporal resolution. Gridded data sets are available as NetCDF files containing variables for the parameter value as anomaly in mm equivalent water height and the parameter’s uncertainty as mm equivalent water height. The latest version of the data is visualized at the GravIS portal: http://gravis.gfz-potsdam.de/gws. From GravIS, the data is also available as area averages for several large river basins and aquifers, as well as for climatically similar regions. G3P was funded by the EU Horizon 2020 programme in response to the call LC-SPACE-04-EO-2019-2020 “Copernicus evolution – Research activities in support of cross-cutting applications between Copernicus services” under grant agreement No. 870353.
    Type: info:eu-repo/semantics/workingPaper
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  • 4
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    Global Gravity-based Groundwater Product (2023)
    Details
    Publication Date: 2023-08-04
    Description: Beneath Earth’s surface, there’s water – in the cracks and spaces in soil, sand and rock. While the ability to detect groundwater is crucial, there is still no data source worldwide that operationally provides information on changing groundwater resources in a consistent way, observation-based, and with global coverage. To fill this gap, the EU-funded G3P project will bring together science and industry across Europe to show groundwater storage variations using GRACE and GRACE-FO satellite gravity data. GRACE was a 2002-2017 satellite mission. GRACE-FO followed in 2018 to provide continuity for the GRACE data set. While the project’s approach is not new, it is global in extent and utmost based on satellite observation data instead of simulated data.
    Type: info:eu-repo/semantics/report
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    GFZ OAI
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