High-Frequency Response of the Atmospheric Electric Potential Gradient Under Strong and Dry Boundary-Layer Convection |
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Authors: | Ricardo Conceição Hugo Gonçalves Silva Alec Bennett Rui Salgado Daniele Bortoli Maria João Costa Manuel Collares Pereira |
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Institution: | 1.Renewable Energies Chair, IIFA,University of évora,évora,Portugal;2.Bristol Industrial and Research Associates Limited (Biral),Bristol,UK;3.Department of Electronic and Electrical Engineering,University of Bath,Bath,UK;4.Department of Physics, ICT, Institute of Earth Sciences,University of évora,évora,Portugal |
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Abstract: | The spectral response of atmospheric electric potential gradient gives important information about phenomena affecting this gradient at characteristic time scales ranging from years (e.g., solar modulation) to fractions of a second (e.g., turbulence). While long-term time scales have been exhaustively explored, short-term scales have received less attention. At such frequencies, space-charge transport inside the planetary boundary layer becomes a sizeable contribution to the potential gradient variability. For the first time, co-located (Évora, Portugal) measurements of boundary-layer backscatter profiles and the 100-Hz potential gradient are reported. Five campaign days are analyzed, providing evidence for a relation between high-frequency response of the potential gradient and strong dry convection. |
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