Preprints
https://doi.org/10.5194/amt-2020-427
https://doi.org/10.5194/amt-2020-427

  31 Oct 2020

31 Oct 2020

Review status: this preprint is currently under review for the journal AMT.

Experimental calibration assessment of a MPLNET/Micro-Pulse Lidar system in comparison with EARLINET lidar measurements for aerosol optical properties retrieval

Carmen Córdoba-Jabonero1, Albert Ansmann2, Cristofer Jiménez2, Holger Baars2, María-Ángeles López-Cayuela1, and Ronny Engelmann2 Carmen Córdoba-Jabonero et al.
  • 1Instituto Nacional de Técnica Aeroespacial (INTA), Atmospheric Research and Instrumentation Branch, Torrejón de Ardoz, 28850-Madrid, Spain
  • 2Leibniz Institute for Tropospheric Research (TROPOS), Leipzig, Germany

Abstract. Simultaneous observations of a polarized Micro-Pulse Lidar (P-MPL) system, currently operative within MPLNET (NASA Micro-Pulse Lidar Network), with two referenced EARLINET (European Aerosol Research Lidar Network) lidars, running at Leipzig site (Germany, 51.4º N 12.4º E, 125 m a.s.l.), were performed during a comprehensive two-month field campaign in summer 2019. A calibration assessment regarding the overlap (OVP) correction of the P-MPL signal profiles and its impact in the retrieval of the optical properties is achieved, describing also the experimental procedure used. The optimal lidar-specific OVP function for correcting the P-MPL measurements is experimentally determined, highlighting that the OVP function as delivered by the P-MPL manufacturer cannot be used. Among the OVP functions examined, the averaged one between those obtained from the comparison of the P-MPL observations with those of the other two referenced lidars seems to be the best proxy at both near- and far-field ranges. In addition, the impact of the OVP function in the accuracy of the retrieved profiles of the total particle backscatter coefficient (PBC) and the particle linear depolarization ratio (PLDR) is examined. First, the volume linear depolarization ratio (VLDR) profile is obtained and compared to the reference lidars, showing it needs to be corrected by a small offset value within a good accuracy. Once P-MPL measurements are optimally OVP-corrected, the PBC profiles (and hence the PLDR ones) can be derived using the Klett-Fernald approach. In addition, an alternative method based on the separation of the total PBC into their aerosol components is presented in order to estimate the total particle extinction coefficient (PEC) profile, and hence the Aerosol Optical Depth, from elastic P-MPL measurements. A dust event as observed at Leipzig in June 2019 is used for illustration. In overall, an adequate OVP function is needed to be determined in a regular basis to calibrate the P-MPL system in order to derive suitable aerosol products.

Carmen Córdoba-Jabonero et al.

 
Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

Carmen Córdoba-Jabonero et al.

Carmen Córdoba-Jabonero et al.

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Short summary
An experimental calibration assessment of the MPLNET/polarized Micro-Pulse Lidar (P-MPL) system in comparison with EARLINET lidars is performed concerning the retrieval of aerosol optical properties. The calibration evaluation is particularly focused on both the optimally-determined overlap function and volume depolarization ratio. An adequate P-MPL overlap must be regularly estimated to derive suitable aerosol products (backscatter and extinction coefficients and particle depolarization ratio).