Philippe Royer

Leosphere · Department of Scientific and Technological Reasearch

The measurement range of a coherent wind Doppler lidar (CWDL) along a laser beam is the maximum distance from the lidar where wind speed data are accurately retrieved. It means that, at this distance, a sufficient number of emitted laser photons are backscattered and received by the lidar. Understanding of the propagation of the laser through the a...

The accurate localization and characterization of aerosol and cloud layers is crucial for climate studies (aerosol indirect effect), meteorology (Planetary Boundary Layer PBL height), site monitoring (industrial emissions, mining,…) and natural hazards (thunderstorms, volcanic eruptions). LEOSPHERE has recently developed aerosol/cloud detection and...

LEOSPHERE has recently developed a new Raman and dual-polarization aerosol lidar : the R-MAN510. The discrimination of atmospheric particles (marine aerosols, continental pollution, cirrus clouds, dust aerosols and volcanic ashes) is made possible thanks to the three detection channels : co- and cross-polarization elastic channels for the computati...

Atmospheric aerosols play a key role on climate balance (direct, semi-direct and indirect effects), on human health (increase of breathing problems and lung cancer for pollution aerosols) and human activities (damage to aircraft engines by volcanic ashes, reduction of visibility by dust or pollution aerosols). In order to monitor and characterize t...

The HyMeX program (Hydrological cycle in Mediterranean eXperiment) aims at improving our understanding of hydrological cycle in the Mediterranen and at a better quantification and forecast of high-impact weather events in numerical weather prediction models. The first Special Observation Period (SOP1) took place in September/October 2012. During th...

The FENNEC program aims to improve our knowledge of both the role of the Saharan Heat Low (SHL) on the West African monsoon and the interactions between the African continent and the Mediterranean basin through the Saharan dust transport. The Saharan desert is the major source of mineral dust in the world and may significantly impact the air qualit...

Major pollution events encountered in the Paris area are mainly due to anticyclonic conditions where air masses are blocked and recycled (horizontal wind speed less than 1 m.s-1) or advected from northestern Europe. Such events with aerosol optical thickness larger than 0.4 at 355 nm have been documented by in situ sensors (AirParif network), groun...

Within the framework of a French nationally funded project (CO2-MEGAPARIS) for quantifying the CO2 emissions of the Paris area, a lidar-based experimental investigation of the variability of the atmospheric boundary layer (ABL) depths was performed over four days in March 2011 under clear sky conditions. The prevailing synoptic settings were mainly...

Following the eruption of the Icelandic volcano Eyjafjallajökull on the 14 April 2010, ground-based N2-Raman lidar (GBL) measurements were used to trace the temporal evolution of the ash plume from 16 to 20 April 2010 above the southwestern suburb of Paris. The nighttime overpass of the Cloud-Aerosol LIdar with Orthogonal Polarization onboard Cloud...

The R-MAN510 is the new Raman lidar super ceilometer developed by Leosphere company. Based on the experience with the ALS aerosol lidar, LEOSPHERE developed the R-Man510 a low cost, and low maintenance lidar dedicated to operational networks. It still preserves the benefits of the lidar: a high range and a low overlap. The combination of polarized...

An Ultra-Violet Rayleigh-Mie lidar has been integrated aboard the French research aircraft Falcon20 in order to monitor the ash plume emitted by the Eyjafjallajökul volcano in April-May 2010. Three operational flights were carried out on 21 April, 12 and 16 May 2010 inside French, Spanish and British air spaces, respectively. The original purpose o...

The R-MAN510 raman lidar super-ceilometer contributes to fill in a lack of actual ground based measurements especially in aerosol detection and classification. This new polarized and nitrogen Raman networkable lidar provides automatic and real-time detection of atmospheric structure, retrieval of optical properties and classification of cloud and a...

The R-MAN510 is the new raman lidar super ceilometer developed by Leosphere company. Based on the experience with the ALS aerosol lidar, LEOSPHERE develops the R-Man510 a low cost, and low maintenance lidar dedicated to networks. It still preserves the benefits of the lidar: a high range and a low overlap. The combining of polarized and Raman chann...

A new instrument for the determination of stable boundary layer : R-Man510 lidar

The FENNEC program aims to improve our knowledge of both the role of the Saharan Heat Low (SHL) on the West African monsoon and the interactions between the African continent and the Mediterranean basin through the Saharan dust transport. The Saharan desert is the major source of mineral dust in the world and may significantly impact the air qualit...

This unprecedented study of daytime measurements performed over 3 years (2007-2010) with a robust commercial lidar (ALS 450, www.leosphere.com) installed ~20 km south of Paris (instrumented site of Palaiseau - SIRTA) and coupled with a sunphotometer, shows that differing optical properties allow the discrimination of several families in the observe...

In the framework of the FENNEC experiment (6 to 30 June 2011) an effort has been dedicated to characterize Saharan dust plumes transported towards southern Europe. Hence, a multi instrumented field campaign has been conducted. Ground based nitrogen Raman LIDAR (GBNRL) has been deployed in southern Spain close to Marbella, simultaneously with airbor...

A new compact and light nitrogen Raman lidar (R-Man510) has recently been developed by Leosphere company. This UV-lidar system is based on a low energy diode pumped Nd:YAG laser at 355 nm and has been developed to be operated unmanly for the meteorological and airport needs. Measurements are typically performed with a vertical resolution between 15...

Megacities emit huge quantities of atmospheric CO2 that we certainly need to quantify to better assess the carbon budget and follow up trends in emissions, as well as efficiency of emission reduction policies. However, uncertainties on CO2 urban emissions are large and can reach 100% in some sectors. Paris, the third megacity in Europe, belongs to...

This study shows an aerosol content survey in the low and middle troposphere over Paris with a compact and light Nitrogen-Raman lidar which has been recently developed by the Commissariat à l’Energie Atomique (CEA) and LEOSPHERE company. This eye-safe and wide field-of-view system (full overlap between 150 and 200m) is particularly well-adapted to...

An innovative approach using mobile lidar measurements was implemented to test the performances of chemistry-transport models in simulating mass concentrations (PM10) predicted by chemistry-transport models. A ground-based mobile lidar (GBML) was deployed around Paris onboard a van during the MEGAPOLI summer experiment in July 2009. The measurement...

The works presented here aim at better understand the impact of aerosols on climate and air quality and interactions between aerosols and water vapour. In order to answer to these scientific issues, new lidar systems have been developed, allowing the measurement of aerosol optical properties and water vapor mixing ratio in the low and middle tropos...

An innovative approach using mobile lidar measurements was implemented to test the performances of chemistry-transport models in simulating mass concentrations (PM10) predicted by chemistry-transport models. A ground-based mobile lidar (GBML) was deployed around Paris onboard a van during the MEGAPOLI (Megacities: Emissions, urban, regional and Glo...

We document aerosol extinction properties in the southern Indian Ocean. A unique data set of shipborne measurements has been collected with a dual Rayleigh-Mie lidar aboard the research vessel Marion Dufresne during two campaigns: one around Madagascar during the Southern Hemisphere late summer and one close to the Kerguelen Islands during the biom...

An Ultra-Violet Rayleigh-Mie lidar was deployed aboard the Falcon-20 (F20) French research aircraft during the Eyjafjöll volcano crisis in order to monitor the ash plume. This compact and light system was developed by the Commissariat à l'Energie Atomique (CEA) and is now commercialized under a CEA-CNRS license by the LEOSPHERE company. The F20 was...

The aerosol mass concentration has been retrieved from ground-based mobile lidar in the frame of MEGAPOLI (Megacities: Emissions, urban, regional and Global Atmospheric POLlution and climate effects, and Integrated tools for assessment and mitigation) European program. We present here the results of the summer campaign that was carried out in July...

We present an original experiment with multiple lidar systems operated simultaneously to study the capability of the Cloud-Aerosol LIdar with Orthogonal Polarization (CALIOP), on board the Cloud-Aerosol Lidar Pathfinder Satellite Observation (CALIPSO), to infer aerosol optical properties in the lower troposphere over a midlatitude continental site...

We propose here a synergy between Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations/Cloud-Aerosol LIdar with Orthogonal Polarization (CALIPSO/CALIOP) and Moderate Resolution Imaging Spectroradiometer (MODIS) onboard Aqua and Terra in order to retrieve aerosol optical properties over the Po Valley from June 2006 to February 2009. Su...

In this study aerosol optical properties are studied over the Po Valley from June 2006 to February 2009 using Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations/Cloud-Aerosol LIdar with Orthogonal Polarization (CALIPSO/CALIOP) and Moderate Resolution Imaging Spectroradiometer (MODIS) onboard Aqua and Terra. The choice of the Po vall...

The Commissariat à l'Energie Atomique (CEA) and the Centre National de la Recherche Scientifique (CNRS) have developed the Lidar Aérosols UltraViolet Aéroporté (LAUVA). The new version of this prototype is now commercialized with success under license by the LEOSPHERE Company with the name EZ LIDAR®. This eye-safe lidar is based on a Nd:YAG laser g...

The MEGAPOLI (Megacities: Emissions, urban, regional and Global Atmospheric POLlution and climat effects, and Integrated tools for assessment and mitigation) summer campaign took place in July 2009 around Paris megacity. The main objectives of the MEGAPOLI campaign are: i) to assess impacts of megacities and large air-pollution hot-spots on local,...

A field campaign was conducted in London between 15 and 23 June 2009 in order to study the influence of emissions from within the London orbital motorway (M25) in terms of aerosol concentrations within the planetary boundary layer (PBL). The instrumental set-up involves a compact aerosol backscatter lidar, onboard a mobile van, developed by the CEA...

The Commissariat à l'Energie Atomique (CEA) and the Centre National de la Recherche Scientifique (CNRS) have developed the Lidar pour l'Etude et le suivi des Aérosols Atmosphériques (LESAA) [1] and the Lidar Aérosols UltraViolet Aéroporté (LAUVA) [2]. The new version of these prototypes is now commercialized with success under license by the LEOSPH...

We present an overview of our different approaches using lidar systems as a tool to validate and develop the new generation of spaceborne missions. We have developed several mini-lidars in order to study the vertical structure, the clouds and the particulate composition of the atmosphere from mobile platforms. Here we focus on three mobile instrume...