Lidar Remote Sensing of Cloud Liquid Water Content and Effective Droplet Diameter: Retrieval Method and Comparison with Monte Carlo Simulations and in Situ Measurements

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Authors
  1. Bissonnette, L.R.
  2. Roy, G.
  3. Poutier, L.
  4. Cober. G.S.
  5. Isaac, G.A.
Corporate Authors
Defence R&D Canada - Valcartier, Valcartier QUE (CAN);ONERA CERT, Toulouse (FRANCE) Departement d'Optique Théorique et Appliquée;Meteorological Service of Canada, Toronto Ont (CAN) Cloud Physics Research Division
Abstract
A multiple-field-of-view (MFOV) lidar measurement and solution technique has been developed to exploit the retrievable particle extinction and size information contained in the multiple scattering contributions to aerosol lidar returns. The report describes in detail the proposed solution algorithm. The primary retrieved parameters are the extinction coefficient at the lidar wavelength and the effective particle diameter from which secondary products like the extinction at other wavelengths and the liquid water content (LWC) of clouds cand be derived. The solutions are compared with true values in a series of Monte Carlo simulations and with liquid-phase cloud measurements. Excellent agreement is obtained for the simulations. For the field experiment, the retrieved effective droplet diameter and LWC are, on average, 10 and 35% (worst case) smaller than the measured data, respectively. In the latter case, the analysis shows that the differences cannot be solely attributed to lidar inversion errors. Overall, the MFOV method is well validated. It thus constitutes an efficient tool for exploiting aerosol lidar backscatter in situations where multiple scattering is measureable. Compared with conventional lidar, the MFOV technique contributes the additional and useful property of average particle size.

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Keywords
MFOV (Multiple Field Of View);Multiple scattering;Adverse weather;Lidar retrieval techniques;Low visibility monitoring;Cloud characterization;In-flight icing
Report Number
DRDC-VALCARTIER-TR-2002-020 — Technical Report
Date of publication
30 Sep 2002
Number of Pages
87
DSTKIM No
CA021240
CANDIS No
517947
Format(s):
Hardcopy;Document Image stored on Optical Disk

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