Preprints
https://doi.org/10.5194/amt-2021-312
https://doi.org/10.5194/amt-2021-312

  20 Nov 2021

20 Nov 2021

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

Empirical model of multiple scattering effect on single-wavelength lidar data of aerosols and clouds

Valery Shcherbakov1,2, Frédéric Szczap1, Alaa Alkasem1, Guillaume Mioche1,2, and Céline Cornet3 Valery Shcherbakov et al.
  • 1Université Clermont Auvergne, CNRS, UMR 6016, Laboratoire de Météorologie Physique, 63178 Aubière, France
  • 2Université Clermont Auvergne, Institut Universitaire de Technologie Clermont Auvergne – site de Montluçon, 03100 Montluçon, France
  • 3Université Lille 1, CNRS, UMR 8518, Laboratoire d’Optique Atmosphérique, 59655 Villeneuve d’Ascq, France

Abstract. We performed extensive Monte Carlo (MC) simulations of single-wavelength lidar signals from a plane-parallel homogeneous layer of atmospheric particles and developed an empirical model to account for the multiple scattering in the lidar signals. The simulations have taken into consideration four types of lidar configurations (the ground based, the airborne, the CALIOP, and the ATLID) and four types of particles (coarse aerosol, water cloud, jet-stream cirrus and cirrus). Most of simulations were performed with the spatial resolution of 20 m and the particles extinction coefficient εp between 0.06 km−1 and 1.0 km−1. The resolution was of 5 m for high values of εp (up to 10.0 km−1). The majority of simulations for ground-based and airborne lidars were performed at two values of the receiver field-of-view (RFOV): 0.25 mrad and 1.0 mrad. The effect of the width of the RFOV was studied for the values up to 50 mrad.

The proposed empirical model is a function that has only three free parameters and approximates the multiple-scattering relative contribution to lidar signals. It is demonstrated that the empirical model has very good quality of MC data fitting for all considered cases.

Special attention was given to the usual operational conditions, i.e., low distances to a particles layer, small optical depths and quite narrow receiver field-of-views. It is demonstrated that multiple scattering effects cannot be neglected when the distance to a particles layer is about 8 km or higher and the full RFOV is of 1.0 mrad. As for the full RFOV of 0.25 mrad, the single scattering approximation is acceptable for aerosols (εp ≲ 1.0 km−1), water clouds (εp ≲ 0.5 km−1), and cirrus clouds (εp ≤ 0.1 km−1). When the distance to a particles layer is of 1 km, the single scattering approximation is acceptable for aerosols and water clouds (εp ≲ 1.0 km−1, both RFOV = 0.25 and RFOV = 1 mrad). As for cirrus clouds, the effect of multiple scattering cannot be neglected even at such low distance when εp ≳ 0.5 km−1.

Valery Shcherbakov et al.

Status: open (until 25 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Valery Shcherbakov et al.

Valery Shcherbakov et al.

Viewed

Total article views: 216 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
173 42 1 216 14 1 0
  • HTML: 173
  • PDF: 42
  • XML: 1
  • Total: 216
  • Supplement: 14
  • BibTeX: 1
  • EndNote: 0
Views and downloads (calculated since 20 Nov 2021)
Cumulative views and downloads (calculated since 20 Nov 2021)

Viewed (geographical distribution)

Total article views: 224 (including HTML, PDF, and XML) Thereof 224 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 08 Dec 2021
Download
Short summary
We performed extensive Monte Carlo (MC) simulations of lidar signals and developed an empirical model to account for the multiple scattering in the lidar signals. The simulations have taken into consideration four types of lidar configurations (the ground based, the airborne, the CALIOP, and the ATLID) and four types of particles (coarse aerosol, water cloud, jet-stream cirrus and cirrus). The empirical model has very good quality of MC data fitting for all considered cases.