Aerosol content survey by mini N2-Raman lidar: Application to local and long-range transport aerosols

Royer, P.; Chazette, Patrick; Lardier, M.; Sauvage, Laurent

doi:10.1016/j.atmosenv.2010.11.001

Cited by 45 publications

(68 citation statements)

References 34 publications

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“…During nighttime, the two elastic and the N 2 -Raman channels of the lidar are used to determine simultaneously the aerosol BER, the vertical profile of the aerosol extinction coefficient (α e ), and the linear particle depolarization ratio (PDR). All methodological details are well presented in Royer et al (2011) and Chazette et al (2012aChazette et al ( , 2014. The relative uncertainty on the BER is ∼ 5 % during nighttime (∼ 10 % during daytime).…”

Section: Raman Lidarmentioning

confidence: 95%

“…The calculations have been performed using the average profile of nighttime measurements during the nights of 16-17 and 27-28 June, for biomass and dust cases, respectively. To improve the inversion, the mean profiles have been inverted using an altitude-variable BER and a regularization approach (Royer et al, 2011). For the first example, the BER (LR) is close to 0.04 sr −1 (25 sr) in the marine boundary layer (MBL) and decreases with the altitude to reach values between 0.02 and 0.025 sr −1 (50 and 40 sr) between 2 and 3 km a.m.s.l.…”

Section: Raman Lidarmentioning

confidence: 99%

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Temporal consistency of lidar observations during aerosol transport events in the framework of the ChArMEx/ADRIMED campaign at Minorca in June 2013

et al. 2016

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Abstract. We performed synergetic daytime and nighttime active and passive remote-sensing observations at Minorca (Balearic Islands, Spain), over more than 3 weeks during the Chemistry-Aerosol Mediterranean Experiment/Aerosol Direct Radiative Effect in the Mediterranean (ChArMEx/ADRIMED) special observation period (SOP 1a, June-July 2013). We characterized the aerosol optical properties and type in the low and middle troposphere using an automated procedure combining Rayleigh-Mie-Raman lidar (355, 387 and 407 nm) with depolarization (355 nm) and AERONET Cimel ® sun-photometer data. Results show a high variability due to varying dynamical forcing. The mean column-averaged lidar backscatter-to-extinction ratio (BER) was close to 0.024 sr −1 (lidar ratio of ∼ 41.7 sr), with a large dispersion of ±33 % over the whole observation period due to changing atmospheric transport regimes and aerosol sources. The ground-based remote-sensing measurements, coupled with satellite observations, allowed the documentation of (i) dust particles up to 5 km (above sea level) in altitude originating from Morocco and Algeria from 15 to 18 June with a peak in aerosol optical thickness (AOT) of 0.25 ± 0.05 at 355 nm, (ii) a long-range transport of biomass burning aerosol (AOT = 0.18 ± 0.16) related to North American forest fires detected from 26 to 28 June 2013 by the lidar between 2 and 7 km and (iii) mixture of local sources including marine aerosol particles and pollution from Spain. During the biomass burning event, the high value of the particle depolarization ratio (8-14 %) may imply the presence of dust-like particles mixed with the biomass burning aerosols in the mid-troposphere. For the field campaign period, we also show linearity with SEVIRI retrievals of the aerosol optical thickness despite 35 % relative bias, which is discussed as a function of aerosol type.

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Section: Raman Lidarmentioning

confidence: 95%

Section: Raman Lidarmentioning

confidence: 99%

Temporal consistency of lidar observations during aerosol transport events in the framework of the ChArMEx/ADRIMED campaign at Minorca in June 2013

et al. 2016

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“…BER is assessed using the AOT as a constraint in Eq. (9) via a dichotomy approach as described by Chazette (2003) or Royer et al (2011). As shown in Berthier et al (2006), the BER is overestimated when multiple scattering occurs.…”

Section: Retrieval Of the Ash Plume Optical Propertiesmentioning

confidence: 99%

French airborne lidar measurements for Eyjafjallajökull ash plume survey

et al. 2012

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Abstract. 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 of the flights was to provide the French civil aviation authorities with objective information on the presence and location of the ash plume. The present paper presents the results of detailed analyses elaborated after the volcano crisis. They bear on the structure of the ash clouds and their optical properties such as the extinction coefficient and the lidar ratio. Lidar ratios were measured in the range of 43 to 50 sr, in good agreement with the ratios derived from groundbased lidar near Paris (France) in April 2010 (∼ 48 sr). The ash signature in terms of particulate depolarization was consistent during all flights (between 34 ± 3 % and 38 ± 3 %). Such a value seems to be a good identification parameter for volcanic ash. Using specific cross-sections between 0.19 and 1.1 m 2 g −1 , the minimum (maximal) mass concentrations in the ash plumes derived for the flights on 12 and 16 May were 140 (2300) and 250 (1500) µg m −3 , respectively. It may be rather less than, or of the order of the critical level of damage (2 mg m −3 ) for the aircraft engines, but well above the 200 µg m −3 warning level.

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“…The Raman lidar WALI offers the capability to retrieve fundamental aerosol optical properties : the vertical profiles of the volume depolarization ratio (VDR) to identify the presence of dust-like aerosols, the aerosol extinction coefficient (AE) to locate in altitude the scattering layers, the equivalent backscatter to extinction ratio (BER) which is proportional to the single scattering albedo, and the aerosol optical thickness (AOT) characterizing the aerosol column burden. The inversion process used both the N 2 -Raman and elastic channels at 355 nm and is described in various papers, such as Royer et al (2011) or Chazette et al (2012), where the related uncertainties are assessed. Hence, using the aerosol optical properties described above, coupled with air mass back trajectory analysis, the air masses influencing the IASI-derived WVMR can be identified.…”

Section: Influence Of the Air Mass Originsaerosol As Air Mass Tracermentioning

confidence: 99%

Comparison of IASI water vapor retrieval with H<sub>2</sub>O-Raman lidar in the framework of the Mediterranean HyMeX and ChArMEx programs

et al. 2014

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Abstract. The Infrared Atmospheric Sounding Interferometer (IASI) is a new generation spaceborne passive sensor mainly dedicated to meteorological applications. Operational Level-2 products have been available via the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT) for several years. In particular, vertical profiles of water vapor measurements are retrieved from infrared radiances at the global scale. Nevertheless, the robustness of such products has to be checked because only a few validations have been reported. For this purpose, the field experiments that were held during the HyMeX and ChArMEx international programs are a very good opportunity. A H 2 ORaman lidar was deployed on the Balearic island of Menorca and operated continuously for ∼ 6 and ∼ 3 weeks during fall 2012 (Hydrological cycle in the Mediterranean eXperiment -HyMeX) and summer 2013 (Chemistry-Aerosol Mediterranean Experiment -ChArMEx), respectively. It measured simultaneously the water vapor mixing ratio and aerosol optical properties. This article does not aim to describe the IASI operational H 2 O inversion algorithm, but to compare the vertical profiles derived from IASI onboard (meteorological operational) MetOp-A and the ground-based lidar measurements to assess the reliability of the IASI operational product for the water vapor retrieval in both the lower and middle troposphere. The links between water vapor contents and both the aerosol vertical profiles and the air mass origins are also studied. About 30 simultaneous observations, performed during nighttime in cloud free conditions, have been considered. For altitudes ranging from 2 to 7 km, root mean square errors (correlation) of ∼ 0.5 g kg −1 (∼ 0.77) and ∼ 1.1 g kg −1 (∼ 0.72) are derived between the operational IASI product and the available lidar profiles during HyMeX and ChArMEx, respectively. The values of both root mean square error and correlation are meaningful and show that the operational Level-2 product of the IASI-derived vertical water vapor mixing ratio can be considered for meteorological and climatic applications, at least in the framework of field campaigns.

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Aerosol content survey by mini N2-Raman lidar: Application to local and long-range transport aerosols

Cited by 45 publications

References 34 publications

Temporal consistency of lidar observations during aerosol transport events in the framework of the ChArMEx/ADRIMED campaign at Minorca in June 2013

Temporal consistency of lidar observations during aerosol transport events in the framework of the ChArMEx/ADRIMED campaign at Minorca in June 2013

French airborne lidar measurements for Eyjafjallajökull ash plume survey

Comparison of IASI water vapor retrieval with H<sub>2</sub>O-Raman lidar in the framework of the Mediterranean HyMeX and ChArMEx programs

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Aerosol content survey by mini N2-Raman lidar: Application to local and long-range transport aerosols

Cited by 45 publications

References 34 publications

Temporal consistency of lidar observations during aerosol transport events in the framework of the ChArMEx/ADRIMED campaign at Minorca in June 2013

Temporal consistency of lidar observations during aerosol transport events in the framework of the ChArMEx/ADRIMED campaign at Minorca in June 2013

French airborne lidar measurements for Eyjafjallajökull ash plume survey

Comparison of IASI water vapor retrieval with H&lt;sub&gt;2&lt;/sub&gt;O-Raman lidar in the framework of the Mediterranean HyMeX and ChArMEx programs

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Comparison of IASI water vapor retrieval with H<sub>2</sub>O-Raman lidar in the framework of the Mediterranean HyMeX and ChArMEx programs