The mobile Water vapor Aerosol Raman LIdar and its implication in the framework of the HyMeX and ChArMEx programs: application to a dust transport process

Chazette, Patrick; Marnas, Fabien; Totems, Julien

doi:10.5194/amt-7-1629-2014

Cited by 55 publications

(84 citation statements)

References 60 publications

(73 reference statements)

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“…The instrument, its calibration and the associated errors are documented in Chazette et al (2014) and will not be detailed here. During all the experiment the acquisition was performed for mean profiles of 1000 laser shots leading to a temporal sampling close to 1 min.…”

Section: The Wali Raman Lidarmentioning

confidence: 99%

“…Hereafter we will only discuss the comparison between IASIderived WVMR and the simultaneous measurements performed by a H 2 O-Raman lidar deployed on the Balearic island of Menorca in the framework of the Hydrological cycle in the Mediterranean eXperiment (HyMeX, http: //www.hymex.org/, Chazette et al, 2014) and ChemistryAerosol Mediterranean Experiment (ChArMEx, http://www. mistrals-home.org).…”

Section: P Chazette Et Al: Comparison Of Iasi Water Vapor Retrievalmentioning

confidence: 99%

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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

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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Section: The Wali Raman Lidarmentioning

confidence: 99%

Section: P Chazette Et Al: Comparison Of Iasi Water Vapor Retrievalmentioning

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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“…LOAC has performed tropospheric flights during the ChArMEx campaign from Minorca Island in time coincidence with the WALI aerosols lidar measurements (Chazette et al, 2014) at a few tens of km apart. One LOAC flight was conducted under a meteorological balloon on 16 June 2014; two LOAC flights were conducted on 19 June 2013 at the same time, the first one being under a meteorological balloon and the second being under a drifting pressurized tropospheric balloon (see the companion paper for more information of the balloons and the gondolas).…”

Section: Tropospheric Vertical Distributionmentioning

confidence: 99%

LOAC: a small aerosol optical counter/sizer for ground-based and balloon measurements of the size distribution and nature of atmospheric particles – Part 1: Principle of measurements and instrument evaluation

et al. 2016

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Abstract. The study of aerosols in the troposphere and in the stratosphere is of major importance both for climate and air quality studies. Among the numerous instruments available, optical aerosol particles counters (OPCs) provide the size distribution in diameter range from about 100 nm to a few tens of µm. Most of them are very sensitive to the nature of aerosols, and this can result in significant biases in the retrieved size distribution. We describe here a new versatile optical particle/sizer counter named LOAC (Light Optical Aerosol Counter), which is light and compact enough to perform measurements not only at the surface but under all kinds of balloons in the troposphere and in the stratosphere. LOAC is an original OPC performing observations at two scattering angles. The first one is around 12 • , and is almost insensitive to the refractive index of the particles; the second one is around 60 • and is strongly sensitive to the refractive Published by Copernicus Publications on behalf of the European Geosciences Union. J.-B. Renard et al.: Size distribution and nature of atmospheric particlesindex of the particles. By combining measurement at the two angles, it is possible to retrieve the size distribution between 0.2 and 100 µm and to estimate the nature of the dominant particles (droplets, carbonaceous, salts and mineral particles) when the aerosol is relatively homogeneous. This typology is based on calibration charts obtained in the laboratory. The uncertainty for total concentrations measurements is ±20 % when concentrations are higher than 1 particle cm −3 (for a 10 min integration time). For lower concentrations, the uncertainty is up to about ±60 % for concentrations smaller than 10 −2 particle cm −3 . Also, the uncertainties in size calibration are ±0.025 µm for particles smaller than 0.6 µm, 5 % for particles in the 0.7-2 µm range, and 10 % for particles greater than 2 µm. The measurement accuracy of submicronic particles could be reduced in a strongly turbid case when concentration of particles > 3 µm exceeds a few particles cm −3 . Several campaigns of cross-comparison of LOAC with other particle counting instruments and remote sensing photometers have been conducted to validate both the size distribution derived by LOAC and the retrieved particle number density. The typology of the aerosols has been validated in well-defined conditions including urban pollution, desert dust episodes, sea spray, fog, and cloud. Comparison with reference aerosol mass monitoring instruments also shows that the LOAC measurements can be successfully converted to mass concentrations.

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“…The molecular extinction and backscatter coefficients are determined based on the polynomial approximation proposed by Nicolet [63] as in Chazette et al [64]. The aerosol contribution has been assessed during the ascent of the ULA as in Chazette et al [41].…”

Section: Adjustment Of Parameters: Relevance Of the Direct Modelmentioning

confidence: 99%

End-to-End Simulation for a Forest-Dedicated Full-Waveform Lidar Onboard a Satellite Initialized from Airborne Ultraviolet Lidar Experiments

Shang

Chazette

2015

Remote Sensing

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Abstract:In order to study forests at the global scale, a detailed link budget for a lidar system onboard satellite is presented. It is based on an original approach coupling airborne lidar observations and an end-to-end simulator. The simulator is initialized by airborne lidar measurements performed over temperate and tropical forests on the French territory, representing a wide range of forests ecosystems. Considering two complementary wavelengths of 355 and 1064 nm, the end-to-end simulator computes the performance of spaceborne lidar systems for different orbits. The analysis is based on forest structural (tree top height, quadratic mean canopy height) and optical (forest optical thickness) parameters. Although an ultraviolet lidar appears to be a good candidate for airborne measurements, our results show that the limited energy is not favorable for spaceborne missions with such a wavelength. A near infrared wavelength at 1064 nm is preferable, requiring ~100 mJ laser emitted energy, which is in agreement with current and future spaceborne missions involving a lidar. We find that the signal-to-noise ratio at the ground level to extract both the structural and optical parameters of forests must be larger than 10. Hence, considering the presence of clouds and aerosols in the atmosphere and assuming a stationary forest, a good detection probability of 99% can be reached when 4 or 5 satellite revisits are considered for a lidar system onboard the ISS or ICESat, respectively. This concerns ~90% of forest covers observed from the lidar, which have an optical thickness less than 3. OPEN ACCESSRemote Sens. 2015, 7 5223

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The mobile Water vapor Aerosol Raman LIdar and its implication in the framework of the HyMeX and ChArMEx programs: application to a dust transport process

Cited by 55 publications

References 60 publications

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

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

LOAC: a small aerosol optical counter/sizer for ground-based and balloon measurements of the size distribution and nature of atmospheric particles – Part 1: Principle of measurements and instrument evaluation

End-to-End Simulation for a Forest-Dedicated Full-Waveform Lidar Onboard a Satellite Initialized from Airborne Ultraviolet Lidar Experiments

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The mobile Water vapor Aerosol Raman LIdar and its implication in the framework of the HyMeX and ChArMEx programs: application to a dust transport process

Cited by 55 publications

References 60 publications

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

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

LOAC: a small aerosol optical counter/sizer for ground-based and balloon measurements of the size distribution and nature of atmospheric particles – Part 1: Principle of measurements and instrument evaluation

End-to-End Simulation for a Forest-Dedicated Full-Waveform Lidar Onboard a Satellite Initialized from Airborne Ultraviolet Lidar Experiments

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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

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