Comparison of Cirrus Cloud Characteristics as Estimated by A Micropulse Ground-Based Lidar and A Spaceborne Lidar CALIOP Datasets Over Lille, France (50.60 °N, 3.14 ° E)

Rita Nohra,Philippe Dubuisson,Frédéric Parol,B Gross,F Moshary,M Arend

doi:10.1051/epjconf/201611916005

Abstract

Our goal is to establish a climatology of cirrus cloud properties over Lille, France (50.60°N, 3.14 °E) using a ground-based lidar. A statistical analysis of mid-latitude cirrus clouds from lidar data in Lille over the period 2008-2013 is presented and discussed. The macrophysical properties (cloud base altitude, cloud top altitude, geometrical thickness, mid-cloud temperature) and optical properties (cloud optical thickness and lidar ratio) are evaluated and compared between the ground-based and the spaceborne lidar CALIOP (Cloud-Aerosol Lidar with Orthogonal Polarization) measurements for the period 2008-2013. We found similar results of macrophysical properties derived from both lidars. In addition a difference in the optical properties results is due to the multiple scattering and the heterogeneity of the observed scenes.

Highlights

A micropulse lidar has been installed in the Laboratoire d’Optique Atmosphérique (LOA), at Cirrus clouds are classified by the World University of Lille (France) since 2006
This micropulse lidar (MPL) is not equipped with a polarizing balance between these two radiative processes, the detector; the information of ice crystals size greenhouse and albedo effects, determines the net or phase of cirrus clouds cannot be obtained
The derived effective lidar ratio implies an iterative process, for the Cloud Optical Thickness (COT) obtained by applying klett inversion forward method (Klett, 1985) [4] coincide with the COT obtained by the transmittance method

Summary

Introduction

A micropulse lidar has been installed in the Laboratoire d’Optique Atmosphérique (LOA), at Cirrus clouds are classified by the World University of Lille (France) since 2006 Meteorological Organization (WMO) as high is operating in automatic mode 24 hours per day, 7 altitude clouds, detached in the form of delicate days per week. This MPL uses a Qswitch active filaments and composed of ice crystals. They trap the outgoing infrared by a 200 mm diameter telescope with an altitude radiation, but at the same time, they can reflect the resolution of 15 m. This MPL is not equipped with a polarizing balance between these two radiative processes, the detector; the information of ice crystals size greenhouse and albedo effects, determines the net or phase of cirrus clouds cannot be obtained

Objectives

Methods

Results