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dc.contributor.authorPentikäinen, Pyry
dc.contributor.authorOrtiz-Amezcua, Pablo
dc.date.accessioned2020-06-25T11:46:03Z
dc.date.available2020-06-25T11:46:03Z
dc.date.issued2020-05
dc.identifier.citationPentikäinen, P., O'Connor, E. J., Manninen, A. J., & Ortiz-Amezcua, P. (2020). Methodology for deriving the telescope focus function and its uncertainty for a heterodyne pulsed Doppler lidar. Atmospheric Measurement Techniques, 13(5). [https://doi.org/10.5194/amt-13-2849-2020]es_ES
dc.identifier.urihttp://hdl.handle.net/10481/62730
dc.descriptionThe Doppler lidar and ceilometer data used in this study were obtained from the Atmospheric Radiation Measurement (ARM) user facility, managed by the Office of Biological and Environmental Research for the U.S. Department of Energy Office of Science.es_ES
dc.description.abstractDoppler lidars provide two measured parameters, radial velocity and signal-to-noise ratio, from which winds and turbulent properties are routinely derived. Attenuated backscatter, which gives quantitative information on aerosols, clouds, and precipitation in the atmosphere, can be used in conjunction with the winds and turbulent properties to create a sophisticated classification of the state of the atmospheric boundary layer. Calculating attenuated backscatter from the signal-to-noise ratio requires accurate knowledge of the telescope focus function, which is usually unavailable. Inaccurate assumptions of the telescope focus function can significantly deform attenuated backscatter profiles, even if the instrument is focused at infinity. Here, we present a methodology for deriving the telescope focus function using a co-located ceilometer for pulsed heterodyne Doppler lidars. The method was tested with Halo Photonics StreamLine and StreamLine XR Doppler lidars but should also be applicable to other pulsed heterodyne Doppler lidar systems. The method derives two parameters of the telescope focus function, the effective beam diameter and the effective focal length of the telescope. Additionally, the method provides uncertainty estimates for the retrieved attenuated backscatter profile arising from uncertainties in deriving the telescope function, together with standard measurement uncertainties from the signal-to-noise ratio. The method is best suited for locations where the absolute difference in aerosol extinction at the ceilometer and Doppler lidar wavelengths is small.es_ES
dc.description.sponsorshipThis research has been supported by the U.S. Department of Energy’s Atmospheric System Research (ASR), an Office of Science, Office of Biological and Environmental Research (BER) programme (grant no. DE-SC0017338).es_ES
dc.language.isoenges_ES
dc.publisherEuropean Geosciences Uniones_ES
dc.rightsAtribución 3.0 España*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/es/*
dc.titleMethodology for deriving the telescope focus function and its uncertainty for a heterodyne pulsed Doppler lidares_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses_ES
dc.identifier.doi10.5194/amt-13-2849-2020


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