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https://doi.org/10.5194/amt-2017-399
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
30 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
Intercomparison of aerosol measurements performed with multi-wavelength Raman lidars, automatic lidars and ceilometers in the frame of INTERACT-II campaign
Fabio Madonna1, Marco Rosoldi1, Simone Lolli1, Francesco Amato1, Joshua Vande Hey2, Ranvir Dhillon2, Yunhui Zheng3, Mike Brettle4, and Gelsomina Pappalardo1 1Istituto di Metodologie per l’Analisi Ambientale, Consiglio Nazionale delle Ricerche (CNR - IMAA)
2University of Leicester, Leicester, UK
3Sigma Space Corporation, Lanham, MD, US
4Campbell Scientific, Shepshed, UK
Abstract. Following on from the previous efforts of INTERACT (INTERcomparison of Aerosol and Cloud Tracking), the INTERACT-II campaign used multi-wavelength Raman lidar measurements to assess the performance of an automatic compact micro-pulse lidar (MiniMPL) and two ceilometers (CL51 and CS135), respectively, to provide reliable information about optical and geometric atmospheric aerosol properties. The campaign took place at the CNR-IMAA Atmospheric Observatory (760 m asl, 40.60° N, 15.72° E), in the framework of the ACTRIS-2 (Aerosol Clouds Trace gases Research InfraStructure) H2020 project. Co-located simultaneous measurements involving a MiniMPL, two ceilometers, and two EARLINET multi-wavelength Raman lidars (MUSA and PEARL) were performed from July to December 2016. Range-corrected signals (RCS) of MiniMPL showed an average difference with respect to MUSA/PEARL RCS of less than 10–15 % below 3.0 km above sea level, largely due to the use of an inaccurate overlap correction, and smaller than 5 % in the free troposphere. For the CL51, the average difference with respect to MUSA/PEARL attenuated backscatter is < 20–30 % below 3 km, larger above. The variability of the CL51 calibration constant is within ±30 %. For the CS135, the performance is similar to the CL51 in the region below 2.0 km asl, while in the region above 3 km asl the differences are ±40 %. The variability of the CS135 normalization constant is within ±40–50 %. Finally, following up to the outcome of a few specific tests performed during the campaign using the CHM15k ceilometer, the CHM15k historical dataset available at CIAO from 2010 to 2016 were investigated to evaluate potential effect of the ceilometer laser fluctuations on calibration stability. The time series of the laser pulses shows an average variability of 10 % with respect to the nominal power which conforms to the specification. Nevertheless, laser pulses variability follows seasonal behavior with an increase in the number of laser pulses in summer and a decrease in winter. This may partly explain the dependency of the ceilometer calibration constant on the environmental temperature hypothesized during INTERACT.

Citation: Madonna, F., Rosoldi, M., Lolli, S., Amato, F., Vande Hey, J., Dhillon, R., Zheng, Y., Brettle, M., and Pappalardo, G.: Intercomparison of aerosol measurements performed with multi-wavelength Raman lidars, automatic lidars and ceilometers in the frame of INTERACT-II campaign, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-399, in review, 2017.
Fabio Madonna et al.
Fabio Madonna et al.
Fabio Madonna et al.

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Short summary
The accurate monitoring of climate based on the use of low-cost and low-maintenance automatic system represents one of the challenges for the scientific community and instrument manufacturers for the next decade. In the frame of two experiments, INTERACT and INTERACT-II, taken place at CIAO (CNR-IMAA Atmospheric Observatory) in Tito Scalo, Potenza, Italy, commercial low-cost lidars have been compared with advanced lidar systems to assess their performances.
The accurate monitoring of climate based on the use of low-cost and low-maintenance automatic...
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