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- W4385979520 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Dust particles in lofted atmospheric layers may present a preferential orientation, which could be detected from the resulting dichroic extinction of the transmitted sunlight. The first indications were provided relatively recently on atmospheric dust layers using passive polarimetry, when astronomical starlight observations of known polarization were found to exhibit an excess in linear polarization, during desert dust events that reached the observational site. We revisit the previous observational methodology by targeting dichroic extinction of transmitted sunlight through extensive atmospheric dust layers utilizing a direct-Sun polarimeter, which is capable to continuously monitor the polarization of elevated aerosol layers. In this study, we present the unique observations from the Solar Polarimeter (SolPol) for different periods within two years, when the instrument was installed in the remote monitoring station of PANGEA - the PanHellenic Geophysical Observatory of Antikythera in Greece. SolPol records polarization, providing all four Stokes parameters, at a default wavelength band centred at 550 nm with a detection limit of 10<sup>-7</sup>. We, overall, report on detected increasing trends of linear polarization, reaching up to 700 parts per million, when the instrument is targeting away from its zenith and direct sunlight propagates through dust concentrations over the observatory. This distinct behaviour is absent on measurements we acquire on days with lack of dust particle concentrations, and in general of low aerosol content. Moreover, we investigate the dependence of the degree of linear polarization to the layers’ optical depth under various dust loads and solar zenith angles, and attempt to interpret these observations as an indication of dust particles being preferentially aligned in the Earth’s atmosphere." @default.
- W4385979520 created "2023-08-19" @default.
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- W4385979520 date "2023-08-18" @default.
- W4385979520 modified "2023-09-30" @default.
- W4385979520 title "Reply on RC2" @default.
- W4385979520 doi "https://doi.org/10.5194/amt-2023-121-ac2" @default.
- W4385979520 hasPublicationYear "2023" @default.
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