Aerosol backscatter profiles from ceilometers: validation of water vapor correction in the framework of CeiLinEx2015
Metadatos
Afficher la notice complèteEditorial
European Geosciences Union
Date
2019Referencia bibliográfica
Wiegner, M., Mattis, I., Pattantyús-Ábrahám, M., Bravo-Aranda, J. A., Poltera, Y., Haefele, A., ... & Haeffelin, M. (2019). Aerosol backscatter profiles from ceilometers: validation of water vapor correction in the framework of CeiLinEx2015. Atmospheric Measurement Techniques, 12(1), 471-490.
Patrocinador
Juan Antonio Bravo-Aranda received funding from the Marie Sklodowska-Curie Action Cofund 2016 EU project – Athenea3i under grant agreement no. 754446. Josef Gasteiger has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant no. 640458, A-LIFE).Résumé
With the rapidly growing number of automated
single-wavelength backscatter lidars (ceilometers), their potential
benefit for aerosol remote sensing received considerable
scientific attention. When studying the accuracy of retrieved
particle backscatter coefficients, it must be considered
that most of the ceilometers are influenced by water vapor
absorption in the spectral range around 910 nm. In the
literature methodologies have been proposed to correct for
this effect; however, a validation was not yet performed. In
the framework of the ceilometer intercomparison campaign
CeiLinEx2015 in Lindenberg, Germany, hosted by the German
Weather Service, it was possible to tackle this open issue.
Ceilometers from Lufft (CHM15k and CHM15kx, operating
at 1064 nm), from Vaisala (CL51 and CL31) and from
Campbell Scientific (CS135), all operating at a wavelength of
approximately 910 nm, were deployed together with a multiwavelength
research lidar (RALPH) that served as a reference.
In this paper the validation of the water vapor correction
is performed by comparing ceilometer backscatter signals
with measurements of the reference system extrapolated
to the water vapor regime. One inherent problem of the validation
is the spectral extrapolation of particle optical properties.
For this purpose AERONET measurements and inversions
of RALPH signals were used.